The increase in release of toxic heavy metals into natural water attracts much attention due to its devastating effect on ecology and human health.The design and implementation of green electrode materials is pivotal ...The increase in release of toxic heavy metals into natural water attracts much attention due to its devastating effect on ecology and human health.The design and implementation of green electrode materials is pivotal for improving the electrochemical performance of in situ heavy metal monitoring.展开更多
A simple and reliable strategy was proposed to engineer the glutathione grafted graphene oxide/ZnO nanocomposite(glutathione-GO/ZnO)as electrode material for the high-performance piroxicam sensor.The prepared glutathi...A simple and reliable strategy was proposed to engineer the glutathione grafted graphene oxide/ZnO nanocomposite(glutathione-GO/ZnO)as electrode material for the high-performance piroxicam sensor.The prepared glutathione-GO/ZnO nanocomposite was well characterized by X-ray diffraction(XRD),Fourier transform infrared spectrum(FTIR),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FE-SEM),cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and differential pulse voltammetry(DPV).The novel nanocomposite modified electrode showed the highest electrocatalytic activity towards piroxicam(oxidation potential is 0.52 V).Under controlled experimental parameters,the proposed sensor exhibited good linear responses to piroxicam concentrations ranging from 0.1 to 500 μM.The detection limit and sensitivity were calculated as 1.8 μM and 0.2 μA/μM·cm^(2),respectively.Moreover,it offered excellent selectivity,reproducibility,and long-term stability and can effectively ignore the interfering candidates commonly existing in the pharmaceutical tablets and human fluids even at a higher concentration.Finally,the reported sensor was successfully employed to the direct determination of piroxicam in practical samples.展开更多
Polymers and metal oxides are well-known materials for various electrochemical sensing applications due to their distinctive properties.In the current decades,the use of composites and nanocomposites of polymer and/or...Polymers and metal oxides are well-known materials for various electrochemical sensing applications due to their distinctive properties.In the current decades,the use of composites and nanocomposites of polymer and/or metal oxide in the sensing domain has been drastically explored.This review conveys the pursuance of several conducting and non-conducting polymers such as polypyrrole,polyvinylpyrrolidone,polyaniline,polythiophene,polyacetylene and their derivatives with several metal oxides(such as TiO_(2),SiO_(2),CeO2,ZnO,CuO,MnO_(2),Fe_(3)O_(4))in the area of electrochemical sensing of some important biomolecules.Herein,various methods of synthesis of nanocomposites,different characterization techniques employed,electrode modification and fabrication methods adopted are cited with rich comparative discussion for sensing applications,specifically in the field of electrochemical and bio-sensing impact using various electrochemical methods are also reviewed.The review will provoke and support the modern researchers of the field to approach new avenues.展开更多
Atomic layers are sought after for molecular sensing due to their available high surface interaction area,and different types of monolayers are attempted for sensing in the recent past.However,their chemical stability...Atomic layers are sought after for molecular sensing due to their available high surface interaction area,and different types of monolayers are attempted for sensing in the recent past.However,their chemical stability towards these molecules is questioned in recent times and alternate methods need to be developed to circumvent such issues,while maintaining high sensitivity.Here,the van der Waals(vdWs)stacks of molybdenum disulfide(MoS_(2))and graphene are shown for their stable electrochemical sensing towards ascorbic acid(AA)and dopamine(DA)-two important biomolecules.AA is known to chemically react with MoS_(2) leading to unstable sensing platform,while here the graphene coverage is shown to protect the MoS_(2) even from low-energy plasma exposure while keeping the same high sensitivity.Upon proving the graphene-based protection of the sensor,such a sensing platform is shown for its applicability in DA sensing,where it is found to give a linear response in a wide range of concentrations(2.5 to 600μmol·L^(−1))and even selective sensing in the presence of AA.Such a stack is found to be not merely giving protection to the beneath MoS_(2) layer but also the inter-layer charge transfer due to work function differences being beneficial in bringing fast and high sensitivity to the next-generation sensors and point-of-care devices.展开更多
An ultrasensitive electrochemical biosensor to detect trace Hg^(2+)in environmental samples was developed utilizing nanogold-decorated magnetic reduced graphene oxide(MrGO-AuNPs),exonuclease III-assisted target cycle(...An ultrasensitive electrochemical biosensor to detect trace Hg^(2+)in environmental samples was developed utilizing nanogold-decorated magnetic reduced graphene oxide(MrGO-AuNPs),exonuclease III-assisted target cycle(Exo Ⅲ-ATC)and hybridization chain reaction(HCR)synergistic triple signal amplification.The MrGO-AuNPs is a superior carrier for capture DNA(cDNA)and acts as magnetic media for automatic separation and adsorption.This innovative utilization of the magnetism and improved sensing efficiency obviates the need for direct modification and repeated polishing of the working electrode.Additionally,the three DNA hairpins(cDNA,methylene blue(MB)labeled HP1 and HP2)further contribute to biosensor specificity and selectivity.When cDNA captures Hgt,it activates Exo Ⅲ-ATC due to the formation of a sticky end in the DNA stem via thymine-Hig-thymidine(T-Hg^(2+)-T),this leads to the hydrolysis of self-folded DNA by Exo Ⅲ-ATC to form"key"DNA(kDNA).The kDNA subsequently initiates HCR,resulting in massive super-sandwich structures(kDNA-[HP1/HP2])carrying signaling molecules on MrGO-AuNPs,and this overall structure serves as a signal probe(SP).Leveraging magnetic adsorption,the SP was automatically adsorbed onto the magneto-glass carbon electrode(MGCE),generating an amplified signal.This biosensor's detection limit(LOD)was 3.14 pmol/L,far below the limit of 10 nmol/L for mercury in drinking water set by the US EPA.The biosensor also showed excellent selectivity when challenged by interfering ions,and the results of its application in actual samples indicate that it has good potential for practical applications in environmental monitoring.展开更多
Recent developments in the biochemical and medicinal industries have been heavily focused on producing affordable glucose biosensors due to the condi nuous annual increase of diabetic patients worldwide.The devel-opme...Recent developments in the biochemical and medicinal industries have been heavily focused on producing affordable glucose biosensors due to the condi nuous annual increase of diabetic patients worldwide.The devel-opment of a fast,accurate,and reliable glucose sensor will increase confidence in controlling di abetes mellitus and its assoclated health complications among the diabetic community.Electraspinning is a versatile method that can produce complex nanofbrous assemblies with attractiwe and functional characteristics from varlous polymers.Electrospun nanofibers demonstrated high efficiency in the immobilization of biological molecules,which can improve the sensing performance further.Integr ation of polymer electrospun nanofibers with metal nanoparticles,metal oxde or transition metal in producing nanobiocomposites is also a highly popul ar approach in the past few years.This report presents the current progress and research trends of the technique,focusing on varous ma-terials and fabrication strategies used to produce biosensing interfaces.This helps readers decide the suitable approach in designing highly sensitive,selective,fast,and inexpensive glucose sensors.展开更多
Coronavirus disease 2019(COVID-19)is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).The gold standard method for the diagnosis of SARS-CoV-2 depends on quantitative r...Coronavirus disease 2019(COVID-19)is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).The gold standard method for the diagnosis of SARS-CoV-2 depends on quantitative reverse transcription-polymerase chain reaction till now,which is time-consuming and requires expensive instrumentation,and the confirmation of variants relies on further sequencing techniques.Herein,we first proposed a robust technique-methodology of electrochemical CRISPR sensing with the advantages of rapid,highly sensitivity and specificity for the detection of SARS-CoV-2 variant.To enhance the sensing capability,gold electrodes are uniformly decorated with electro-deposited gold nanoparticles.Using DNA template identical to SARS-CoV-2 Delta spike gene sequence as model,our biosensor exhibits excellent analytical detection limit(50 fM)and high linearity(R2=0.987)over six orders of magnitude dynamic range from 100 fM to 10 nM without any nucleic-acid-amplification assays.The detection can be completed within 1 h with high stability and specificity which benefits from the CRISPR-Cas system.Furthermore,based on the wireless micro-electrochemical platform,the proposed biosensor reveals promising application ability in point-of-care testing.展开更多
Electrochemical sensing faces huge challenges in characterizing the transient release of biochemical molecules from deformed cells,due to the severely mechanical mismatch between rigid electrodes and soft cells.In rec...Electrochemical sensing faces huge challenges in characterizing the transient release of biochemical molecules from deformed cells,due to the severely mechanical mismatch between rigid electrodes and soft cells.In recent years,the emergence of stretchable electrochemical sensors has made a breakthrough by complying with the deformation of living cells and simultaneous monitoring of mechanically evoked biochemical signals.This review first summarizes two fundamental strategies for the fabrication of stretchable electrodes from the points of structure and material.Next,recent progresses in construction of functionalized interface to improve the performance of stretchable electrochemical sensors are presented.Then,the application of stretchable electrochemical sensors in real-time monitoring of biomolecules released by mechanically sensitive cells is introduced.Finally,some perspectives and challenges of stretchable electrochemical sensors regarding cell detection are discussed.展开更多
Transition metal tungstate-based nanomaterials have become one of the research hotspots in electrochemistry due to their abundant natural resources,low costs,and environmental friendliness.Extensive studies have demon...Transition metal tungstate-based nanomaterials have become one of the research hotspots in electrochemistry due to their abundant natural resources,low costs,and environmental friendliness.Extensive studies have demonstrated their significant potentials for electrochemical applications,such as supercapacitors,Li-ion batteries,Na-ion batteries,electrochemical sensing,and electrocatalysis.Considering the rapidly growing research enthusiasm for this topic over the last several years,herein,a critical review of recent progress on the application of transition metal tungstates and their composites for electrochemical applications is summarized.The relationships between synthetic methods,nano/micro structures and electrochemical properties are systematically discussed.Finally,their promising prospects for future development are also proposed.It is anticipated that this review will inspire ongoing interest in rational designing and fabricating novel transition metal tungstate-based nanomaterials for high-performance electrochemical devices.展开更多
Developing and exploring organic-inorganic hybrid multi-lanthanide(Ln)implanted heteropolyoxometalates(HPOMs)has bloomed into an emerging research fieId.In this article,two neoteric Dgluconic acids(H_(6)GA)concatenati...Developing and exploring organic-inorganic hybrid multi-lanthanide(Ln)implanted heteropolyoxometalates(HPOMs)has bloomed into an emerging research fieId.In this article,two neoteric Dgluconic acids(H_(6)GA)concatenating multi-Ln^(Ⅲ) implanted heteropoly tungstates K_(14)H_(10)[Ln_(4)(H_(2)O)_(4)W_(6)(H_(2)-GA)_(4) O_(12)(B-α-TeW_(9)O_(33))_(4)]·60 H_(2)O(Ln=La^(3+)(1),Pr^(3+)(2))were obtained in acidic aqueous system.Attractively,in the polyanion structure of 1 and 2,six WⅥand four LnⅢcenters are connected by four flexible H_(2)GA^(4-) ligands via carboxyl and hydroxyl groups,resulting in the heterometallic[Ln_(4)(H_(2)O)_(4)W_(6)H_(2)GA)_(4)O_(12)]^(8+)cluster and then the heterometallic cluster is surrounded by four[B-α-TeW_(9)O_(33)]^(8-)segments.Electrochemical measurements for the 1@CFMCN/GCE sensor(CFMCN=carboxylfunctionalized multiwalled carbon nanotube;GCE=glass carbon electrode)demonstrate that 1@CFMCN/GCE shows benign recognition response to detecting noradrenaline(NDA).This research expands the structural diversity of Ln-implanted HPOMs and presents an electrochemical platform of recognizing NDA in the field of biosensors.展开更多
Gunshot Residue(GSR)has been a subject of interest for the forensic fraternity.Numerous analytical contributions towards the GSR analysis have been reported.Sensitivity,portability,cost-effectiveness,speed,etc.are suc...Gunshot Residue(GSR)has been a subject of interest for the forensic fraternity.Numerous analytical contributions towards the GSR analysis have been reported.Sensitivity,portability,cost-effectiveness,speed,etc.are such factors of electrochemical methods that have attracted the researchers across the globe to test the applicability of these as a potential analytical tool for forensic evaluation of GSR.With the development of scientific technology,efforts have been made towards the handheld device for the on-field analysis of GSR.Recently,chemometric treatment of data generated from the electrochemical analysis of GSR has offered more effective approach.It makes the analysis more conclusive and minimizes the chances of false-positive detection.It will be very fruitful to anticipate the analytical potential of electrochemical tools for GSR analysis.This article reviews the research progress towards the development of electrochemical sensor for GSR detection reported during 2013-2020 along with challenges and future perspectives.展开更多
The use of electrochemical sensors for sensitive disease diagnosis and detecting various species with pharmacological,therapeutic,industrial,food-related,and environmental origins is now widely accepted.A catalytic or...The use of electrochemical sensors for sensitive disease diagnosis and detecting various species with pharmacological,therapeutic,industrial,food-related,and environmental origins is now widely accepted.A catalytic or binding event resulting from the sensor’s electroactive component recognizing its analyte creates an electrical signal proportionate to the analyte concentration,which is then monitored by a transducer.The development of morphologically distinct metal and metal oxide nanoparticles formed from first-row transition elements(Mn,Cr,Fe,Co,Ti,Ni,Cu,Zn)and noble metals(Pt,Au,Ag,Pd)is described in this review.The effect of these metal nanoparticles has been studied using Tetracyanoquinodimethane(TCNQ),Ferrocene,and other organic compounds as electroactive species using carbon paste-modified electrodes.Electroanalytical sensors,mostly based on ferrocene,are exceedingly sensitive,selective,affordable,and for detecting numerous biomolecules like glucose,dopamine,NADH,ascorbic acid,and a few dyes and are simple to build.In recent decades,charge transfer organic species-based chemosensors have become a prominent study area.This paper outlines current developments in electrochemical biosensors based on transition metal nanoparticles,covering glucose,ascorbic acid,uric acid,and other inorganic and organic analytes.The importance of transition metal and transition metal oxide nanoparticles as potential electrode modifiers for developing sensors is highlighted.A discussion of the present problem and possible solutions,and plausible future directions marks the review’s conclusion.展开更多
基金The authors would like acknowledge the financial supports from National Pro-gram on Key Basic Research of China(973 Program,2015CB258400)the National Thousand Young Talents Program,Natural Science Foundation of China(51508213,51608217,and 21607046)+1 种基金Innovative and Interdisciplinary Team at HUST(0118261077)the Fundamental Research Funds for Central Universi-ties(2017KFYXJJ217).
文摘The increase in release of toxic heavy metals into natural water attracts much attention due to its devastating effect on ecology and human health.The design and implementation of green electrode materials is pivotal for improving the electrochemical performance of in situ heavy metal monitoring.
基金supported by SERB(Science and Engineering Research Board),New Delhi,India[File.No:EMR/2014/000020].
文摘A simple and reliable strategy was proposed to engineer the glutathione grafted graphene oxide/ZnO nanocomposite(glutathione-GO/ZnO)as electrode material for the high-performance piroxicam sensor.The prepared glutathione-GO/ZnO nanocomposite was well characterized by X-ray diffraction(XRD),Fourier transform infrared spectrum(FTIR),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FE-SEM),cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and differential pulse voltammetry(DPV).The novel nanocomposite modified electrode showed the highest electrocatalytic activity towards piroxicam(oxidation potential is 0.52 V).Under controlled experimental parameters,the proposed sensor exhibited good linear responses to piroxicam concentrations ranging from 0.1 to 500 μM.The detection limit and sensitivity were calculated as 1.8 μM and 0.2 μA/μM·cm^(2),respectively.Moreover,it offered excellent selectivity,reproducibility,and long-term stability and can effectively ignore the interfering candidates commonly existing in the pharmaceutical tablets and human fluids even at a higher concentration.Finally,the reported sensor was successfully employed to the direct determination of piroxicam in practical samples.
基金CSIR,Delhi,India for providing fellowship to Meena Yadav(16/06/2019(i)EU-V),Deenbandhu Chhotu Ram University of Science and Technology,Murthal,Sonepat,Haryana
文摘Polymers and metal oxides are well-known materials for various electrochemical sensing applications due to their distinctive properties.In the current decades,the use of composites and nanocomposites of polymer and/or metal oxide in the sensing domain has been drastically explored.This review conveys the pursuance of several conducting and non-conducting polymers such as polypyrrole,polyvinylpyrrolidone,polyaniline,polythiophene,polyacetylene and their derivatives with several metal oxides(such as TiO_(2),SiO_(2),CeO2,ZnO,CuO,MnO_(2),Fe_(3)O_(4))in the area of electrochemical sensing of some important biomolecules.Herein,various methods of synthesis of nanocomposites,different characterization techniques employed,electrode modification and fabrication methods adopted are cited with rich comparative discussion for sensing applications,specifically in the field of electrochemical and bio-sensing impact using various electrochemical methods are also reviewed.The review will provoke and support the modern researchers of the field to approach new avenues.
基金This work was financially supported by Department of Science and Technology,India extramural research grant(Grant No.EMR/2017/000513)intramural grants at TIFR Hyderabad from the Department of Atomic Energy(DAE).
文摘Atomic layers are sought after for molecular sensing due to their available high surface interaction area,and different types of monolayers are attempted for sensing in the recent past.However,their chemical stability towards these molecules is questioned in recent times and alternate methods need to be developed to circumvent such issues,while maintaining high sensitivity.Here,the van der Waals(vdWs)stacks of molybdenum disulfide(MoS_(2))and graphene are shown for their stable electrochemical sensing towards ascorbic acid(AA)and dopamine(DA)-two important biomolecules.AA is known to chemically react with MoS_(2) leading to unstable sensing platform,while here the graphene coverage is shown to protect the MoS_(2) even from low-energy plasma exposure while keeping the same high sensitivity.Upon proving the graphene-based protection of the sensor,such a sensing platform is shown for its applicability in DA sensing,where it is found to give a linear response in a wide range of concentrations(2.5 to 600μmol·L^(−1))and even selective sensing in the presence of AA.Such a stack is found to be not merely giving protection to the beneath MoS_(2) layer but also the inter-layer charge transfer due to work function differences being beneficial in bringing fast and high sensitivity to the next-generation sensors and point-of-care devices.
基金This study was supported by the Key Research and Development Program of China(No.2018YFC0213400)the National Natural Science Foundation of China(Nos.21737002,21976119,and 22176126)。
文摘An ultrasensitive electrochemical biosensor to detect trace Hg^(2+)in environmental samples was developed utilizing nanogold-decorated magnetic reduced graphene oxide(MrGO-AuNPs),exonuclease III-assisted target cycle(Exo Ⅲ-ATC)and hybridization chain reaction(HCR)synergistic triple signal amplification.The MrGO-AuNPs is a superior carrier for capture DNA(cDNA)and acts as magnetic media for automatic separation and adsorption.This innovative utilization of the magnetism and improved sensing efficiency obviates the need for direct modification and repeated polishing of the working electrode.Additionally,the three DNA hairpins(cDNA,methylene blue(MB)labeled HP1 and HP2)further contribute to biosensor specificity and selectivity.When cDNA captures Hgt,it activates Exo Ⅲ-ATC due to the formation of a sticky end in the DNA stem via thymine-Hig-thymidine(T-Hg^(2+)-T),this leads to the hydrolysis of self-folded DNA by Exo Ⅲ-ATC to form"key"DNA(kDNA).The kDNA subsequently initiates HCR,resulting in massive super-sandwich structures(kDNA-[HP1/HP2])carrying signaling molecules on MrGO-AuNPs,and this overall structure serves as a signal probe(SP).Leveraging magnetic adsorption,the SP was automatically adsorbed onto the magneto-glass carbon electrode(MGCE),generating an amplified signal.This biosensor's detection limit(LOD)was 3.14 pmol/L,far below the limit of 10 nmol/L for mercury in drinking water set by the US EPA.The biosensor also showed excellent selectivity when challenged by interfering ions,and the results of its application in actual samples indicate that it has good potential for practical applications in environmental monitoring.
基金the Faculty of Chemical Engineering and University Teknologi MARA for the funding through grants 600-IRMI 5/3/GIP(070/2019),600-IRMI/DANA 5/3/BESTARI(115/2018),and 600 IRMI MYRA 5/3 BESTARI(021/2017).
文摘Recent developments in the biochemical and medicinal industries have been heavily focused on producing affordable glucose biosensors due to the condi nuous annual increase of diabetic patients worldwide.The devel-opment of a fast,accurate,and reliable glucose sensor will increase confidence in controlling di abetes mellitus and its assoclated health complications among the diabetic community.Electraspinning is a versatile method that can produce complex nanofbrous assemblies with attractiwe and functional characteristics from varlous polymers.Electrospun nanofibers demonstrated high efficiency in the immobilization of biological molecules,which can improve the sensing performance further.Integr ation of polymer electrospun nanofibers with metal nanoparticles,metal oxde or transition metal in producing nanobiocomposites is also a highly popul ar approach in the past few years.This report presents the current progress and research trends of the technique,focusing on varous ma-terials and fabrication strategies used to produce biosensing interfaces.This helps readers decide the suitable approach in designing highly sensitive,selective,fast,and inexpensive glucose sensors.
基金support from the Innovation Team Project of Department of Education of Guangdong Province(No.2018KCXTD026)Guangdong Scientific and Technological Project(2019B1515120043,2020A151501612,2021A1515220109,2022B1515020093)+1 种基金Science and Technology Innovation Commission of Shenzhen(Grant No.KCXFZ20201221173413038)Longhua District Science and Innovation Commission Project Grants of Shenzhen(JCYJ201904).
文摘Coronavirus disease 2019(COVID-19)is a highly contagious disease caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).The gold standard method for the diagnosis of SARS-CoV-2 depends on quantitative reverse transcription-polymerase chain reaction till now,which is time-consuming and requires expensive instrumentation,and the confirmation of variants relies on further sequencing techniques.Herein,we first proposed a robust technique-methodology of electrochemical CRISPR sensing with the advantages of rapid,highly sensitivity and specificity for the detection of SARS-CoV-2 variant.To enhance the sensing capability,gold electrodes are uniformly decorated with electro-deposited gold nanoparticles.Using DNA template identical to SARS-CoV-2 Delta spike gene sequence as model,our biosensor exhibits excellent analytical detection limit(50 fM)and high linearity(R2=0.987)over six orders of magnitude dynamic range from 100 fM to 10 nM without any nucleic-acid-amplification assays.The detection can be completed within 1 h with high stability and specificity which benefits from the CRISPR-Cas system.Furthermore,based on the wireless micro-electrochemical platform,the proposed biosensor reveals promising application ability in point-of-care testing.
基金This work was supported by the National Natural Science Foundation of China(Grants 22122408,21725504 and 21721005)the Strategic Priority Research Program of Chinese Academy of Sciences(XDA16021306)the Fundamental Research Funds for the Central Universities(2042021kf0035 and 2042022kf0030).
文摘Electrochemical sensing faces huge challenges in characterizing the transient release of biochemical molecules from deformed cells,due to the severely mechanical mismatch between rigid electrodes and soft cells.In recent years,the emergence of stretchable electrochemical sensors has made a breakthrough by complying with the deformation of living cells and simultaneous monitoring of mechanically evoked biochemical signals.This review first summarizes two fundamental strategies for the fabrication of stretchable electrodes from the points of structure and material.Next,recent progresses in construction of functionalized interface to improve the performance of stretchable electrochemical sensors are presented.Then,the application of stretchable electrochemical sensors in real-time monitoring of biomolecules released by mechanically sensitive cells is introduced.Finally,some perspectives and challenges of stretchable electrochemical sensors regarding cell detection are discussed.
基金the National Key Research and Development Program of China(No.2020YFB1713500)the Opening Project of National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials&Henan Key Laboratory of High-temperature Structural and Functional Materials,Henan University of Science and Technology(No.HKDNM2019013)+1 种基金the Student Research Training Plan of Henan University of Science and Technology(Nos.2021026 and 2021035)the Undergraduate Innovation and Entrepreneurship Training Program of Henan Province(No.S202110464005).
文摘Transition metal tungstate-based nanomaterials have become one of the research hotspots in electrochemistry due to their abundant natural resources,low costs,and environmental friendliness.Extensive studies have demonstrated their significant potentials for electrochemical applications,such as supercapacitors,Li-ion batteries,Na-ion batteries,electrochemical sensing,and electrocatalysis.Considering the rapidly growing research enthusiasm for this topic over the last several years,herein,a critical review of recent progress on the application of transition metal tungstates and their composites for electrochemical applications is summarized.The relationships between synthetic methods,nano/micro structures and electrochemical properties are systematically discussed.Finally,their promising prospects for future development are also proposed.It is anticipated that this review will inspire ongoing interest in rational designing and fabricating novel transition metal tungstate-based nanomaterials for high-performance electrochemical devices.
基金Project supported by the National Natural Science Foundation of China(21871077,21671054,21771052,22071042,22001058,22171070)the Program for Innovation Teams in Science and Technology in Universities of Henan Province(20IRTSTHN004)。
文摘Developing and exploring organic-inorganic hybrid multi-lanthanide(Ln)implanted heteropolyoxometalates(HPOMs)has bloomed into an emerging research fieId.In this article,two neoteric Dgluconic acids(H_(6)GA)concatenating multi-Ln^(Ⅲ) implanted heteropoly tungstates K_(14)H_(10)[Ln_(4)(H_(2)O)_(4)W_(6)(H_(2)-GA)_(4) O_(12)(B-α-TeW_(9)O_(33))_(4)]·60 H_(2)O(Ln=La^(3+)(1),Pr^(3+)(2))were obtained in acidic aqueous system.Attractively,in the polyanion structure of 1 and 2,six WⅥand four LnⅢcenters are connected by four flexible H_(2)GA^(4-) ligands via carboxyl and hydroxyl groups,resulting in the heterometallic[Ln_(4)(H_(2)O)_(4)W_(6)H_(2)GA)_(4)O_(12)]^(8+)cluster and then the heterometallic cluster is surrounded by four[B-α-TeW_(9)O_(33)]^(8-)segments.Electrochemical measurements for the 1@CFMCN/GCE sensor(CFMCN=carboxylfunctionalized multiwalled carbon nanotube;GCE=glass carbon electrode)demonstrate that 1@CFMCN/GCE shows benign recognition response to detecting noradrenaline(NDA).This research expands the structural diversity of Ln-implanted HPOMs and presents an electrochemical platform of recognizing NDA in the field of biosensors.
基金the University Grants Commission(UGC),Ministry of EducationGovernment of India,for providing financial assistance(UGC-JRF vide Letter No.190521040928)to the first author(AH).
文摘Gunshot Residue(GSR)has been a subject of interest for the forensic fraternity.Numerous analytical contributions towards the GSR analysis have been reported.Sensitivity,portability,cost-effectiveness,speed,etc.are such factors of electrochemical methods that have attracted the researchers across the globe to test the applicability of these as a potential analytical tool for forensic evaluation of GSR.With the development of scientific technology,efforts have been made towards the handheld device for the on-field analysis of GSR.Recently,chemometric treatment of data generated from the electrochemical analysis of GSR has offered more effective approach.It makes the analysis more conclusive and minimizes the chances of false-positive detection.It will be very fruitful to anticipate the analytical potential of electrochemical tools for GSR analysis.This article reviews the research progress towards the development of electrochemical sensor for GSR detection reported during 2013-2020 along with challenges and future perspectives.
文摘The use of electrochemical sensors for sensitive disease diagnosis and detecting various species with pharmacological,therapeutic,industrial,food-related,and environmental origins is now widely accepted.A catalytic or binding event resulting from the sensor’s electroactive component recognizing its analyte creates an electrical signal proportionate to the analyte concentration,which is then monitored by a transducer.The development of morphologically distinct metal and metal oxide nanoparticles formed from first-row transition elements(Mn,Cr,Fe,Co,Ti,Ni,Cu,Zn)and noble metals(Pt,Au,Ag,Pd)is described in this review.The effect of these metal nanoparticles has been studied using Tetracyanoquinodimethane(TCNQ),Ferrocene,and other organic compounds as electroactive species using carbon paste-modified electrodes.Electroanalytical sensors,mostly based on ferrocene,are exceedingly sensitive,selective,affordable,and for detecting numerous biomolecules like glucose,dopamine,NADH,ascorbic acid,and a few dyes and are simple to build.In recent decades,charge transfer organic species-based chemosensors have become a prominent study area.This paper outlines current developments in electrochemical biosensors based on transition metal nanoparticles,covering glucose,ascorbic acid,uric acid,and other inorganic and organic analytes.The importance of transition metal and transition metal oxide nanoparticles as potential electrode modifiers for developing sensors is highlighted.A discussion of the present problem and possible solutions,and plausible future directions marks the review’s conclusion.