采用简单液相沉积法制备了分级结构Cd S QDs/Bi OCl复合光催化剂,以XRD,SEM,TEM,HRTEM,XPS,EDS,UV-Vis DRS,PL等测试方法分别表征了样品的物相、形貌、组成、元素含量、光吸收性能以及光电特性,并以罗丹明B(Rh B)和苯酚为模型污染物,分...采用简单液相沉积法制备了分级结构Cd S QDs/Bi OCl复合光催化剂,以XRD,SEM,TEM,HRTEM,XPS,EDS,UV-Vis DRS,PL等测试方法分别表征了样品的物相、形貌、组成、元素含量、光吸收性能以及光电特性,并以罗丹明B(Rh B)和苯酚为模型污染物,分别在可见光和紫外光下评价Cd S QDs/Bi OCl复合光催化剂的催化性能。测试结果表明,粒径为5.5μm的Bi OCl微球由大量纳米片有序堆积而成,所负载的粒径为10~20 nm的Cd S QDs均匀分布在Bi OCl纳米片表面。与纯Bi OCl和Cd S QDs/Bi OCl相比,Cd S QDs/Bi OCl-3%表现出最佳的光催化性能,其对Rh B和苯酚的降解速率常数分别是纯Bi OCl的2.6倍和5.3倍。Cd S QDs/Bi OCl复合光催化剂性能的提高可归结于,分级结构Bi OCl有效防止了片层堆积,有助于Cd S QDs的负载,另外,Cd S QDs的负载拓展了复合光催化剂的光吸收性能,均匀分布的Cd S QDs与Bi OCl形成的异质结促进了光生电子-空穴对的有效分离。展开更多
Semiconductor quantum dots(QDs) were used for labeling many biomacromolecules and small molecules,but it remains a challenge to couple it with short active peptides without any limitation,which play critical roles in ...Semiconductor quantum dots(QDs) were used for labeling many biomacromolecules and small molecules,but it remains a challenge to couple it with short active peptides without any limitation,which play critical roles in many physiological processes.Several coupling methods known about QDs and short peptides have some limitations.In this research,we report a method for the synthesis of QDs labeled peptides to be appropriate to any short peptide.The QDs(CdTe)-labeled short peptides were verified and characterized by RP-HPLC.The result shows that the surface of the T cell treated with QDs-TP5 emits yellow fluoresence.These results indicate that QDs-TP5 tends to aggregate on the surface of T cells.They were applied to monitoring the specific binding between the immune peptides and T cell surface receptors.The binding and the resultant fluorescence were observed and monitored by fluorescence microscope in vitro.The QDs-labeled immune peptides provide a powerful method for studying the immune modulating activity of TP5 in vivo.展开更多
Measuring the growth parameters of Ge quantum dots （QDs） embedded in SiO2/Si hetero-structure is pre- requisite for developing the optoelectronic devices such as photovoltaics and sensors. Their optical properties c...Measuring the growth parameters of Ge quantum dots （QDs） embedded in SiO2/Si hetero-structure is pre- requisite for developing the optoelectronic devices such as photovoltaics and sensors. Their optical properties can be tuned by tailoring the growth morphology and structures, where the growth parameters＇ optimizations still need to be explored. We determine the effect of annealing temperature on surface morphology, structures and optical properties of Ge//SiO2//Si hetero-structure. Samples are grown via rf magnetron sputtering and subsequent characterizations are made using imaging and spectroscopic techniques.展开更多
目的制备毒性低,生物相容性好的新型半导体量子点。方法以还原型谷胱甘肽（GSH）为硫源和稳定剂,采用水热法合成Cd Te/Cd S QDs。结果制备的GSH包裹的Cd Te/Cd S QDs波长范围覆盖400~800 nm的区域,量子产率高达83.1%,平均粒径约为3 nm...目的制备毒性低,生物相容性好的新型半导体量子点。方法以还原型谷胱甘肽（GSH）为硫源和稳定剂,采用水热法合成Cd Te/Cd S QDs。结果制备的GSH包裹的Cd Te/Cd S QDs波长范围覆盖400~800 nm的区域,量子产率高达83.1%,平均粒径约为3 nm。结论该Cd Te/Cd S QDs制备方法简便,成本低,有效降低了量子点生物毒性。展开更多
In this work the enhanced molecularly imprinted optosensing material based on graphene oxide-quantum dots （ GO- QDs） was synthesized for highly selective and sensitive specific recognition of the target protein, bov...In this work the enhanced molecularly imprinted optosensing material based on graphene oxide-quantum dots （ GO- QDs） was synthesized for highly selective and sensitive specific recognition of the target protein, bovine serum albumin （BSA）. Here, GO was introduced to enhance the efficiency of mass-transfer in recognition of target protein. Molecularly imprinted polymer coated GO-QDs using BSA as template （BMIP-coated GO-QDs ） exhibited a fast mass-transfer speed, which could be ascribed to the high volume of efficient surface area and high target recognition efficiency of the synthesized nanoscale device. Under optimal conditions, it was found that the BSA as target protein could remarkably quench the relative fluorescence intensity of BMIP- coated GO-QDs linearly in a concentration-dependent manner that was best described by a Stern-Volmer equation. The Ksv （Stern- Volmer constant） for template BSA was much higher than bovine hemoglobin （BHb） and lysozyme （Lyz）, implying a highly selective recognition ability of the BMIP-coated GO-QDs to BSA. This enhanced fluorescent nanoscale device may provide opportunities to develop a system that is efficient and effective and has potential in the design of highly effective fluorescent receptor for recognition of target protein in Droteomics studies.展开更多
The active oxygen species in the catalytic oxidation system of Fe(Ⅲ)PcTs-t-BuOOH were identified,and the mechanism of the catalytic oxidation of phenolic substrates was proposed.Quinone imine molecules,the main produ...The active oxygen species in the catalytic oxidation system of Fe(Ⅲ)PcTs-t-BuOOH were identified,and the mechanism of the catalytic oxidation of phenolic substrates was proposed.Quinone imine molecules,the main products of catalytic oxidation reaction,can be adsorbed on the surface of CdTe QDs,resulting in their fluorescence quenching.A dual function of catalytic oxidation and fluorescence sensing was developed for the determination of dichlorophenol(DCP)based on the Fe(Ⅲ)PcTs-BuOOH-CdTe QDs system.The linear detection range of DCP was 1×10^(-6)-1.3×10^(-4) mol/L,and the detection limit 2.4×10^(-7) mol/L.This method was characterized by high selectivity,good repeatability and desirable stability,presenting promising potentials for analyzing DCP concentration in real water samples.展开更多
The strong anisotropic electrical properties of one-dimensional(1 D) nanostructure semiconductors,especially the anisotropic carrier transport, have a negative and significant influence on the performance of solar cel...The strong anisotropic electrical properties of one-dimensional(1 D) nanostructure semiconductors,especially the anisotropic carrier transport, have a negative and significant influence on the performance of solar cells if the nanostructures have random orientation. Considering the advantages of nanorod solar cells in carrier transport, we have achieved growth of vertically aligned Sb_(2)Se_(3) nanorod array with highly(hk1) orientation on Cd S substrate, and constructed superstrate nanorod solar cells for the first time. The Sb_(2)Se_(3) nanorod array solar cells exhibit the more efficient and long-range carrier transport in vertical direction. Furthermore, in order to suppress interface recombination, a CuInSe_(2) quantum dots(QDs) sensitizer has been applied to fill the volume between the nanorods completely, thus forming an interpenetrating nanocomposite structure. The CuInSe_(2) QDs can harvest additional light by absorption of visible light and contribute photocurrent. Meantime, the QDs function as a hole transport material and thus reduce the dependence of lateral transport. Consequently, the interpenetrating nanocomposite CuInSe_(2) / Sb_(2)Se_(3) solar cells display a power conversion efficiency of 7.54% with significant enhancements in the short-circuit current density and open-circuit voltage over pure Sb_(2)Se_(3) nanorod cells. This is the highest efficiency for superstrate solar cells based on Sb_(2)Se_(3) nanorod arrays.展开更多
The synthesis of water-soluble quantum dots(QDs)has recently received extensive attention dueto noninvasive detection of biological information in living subjects.In this paper,high-qualitywater-soluble(cadmium-free)q...The synthesis of water-soluble quantum dots(QDs)has recently received extensive attention dueto noninvasive detection of biological information in living subjects.In this paper,high-qualitywater-soluble(cadmium-free)quaternary AgZnlnS QDs have been successfully synthesized usinga green synthetic route.The as-prepared QDs exhibit tunable photoluminescence(PL)emissionbetween 521 and 658 nm.Secondly,multidrug resistance(MDR)is a major impedinent to theeffective cancer chemot herapy,DOx,a widely used antit umor drug was modified on the surfaceof the QDs in this study.It,therefore,ignificantly enhanced the cytotoxicity of DX to MDRcancer cells as the QDs could bring the DoX to nucleus.展开更多
In this work,glutathione capped CdTe QDs(GSH-QDs)were prepared through a one-pot process and found to be quenched by Cr^3+,Ag^+and Cu^2+ions.Cr^3+and chromium(III)picolinate could be quantitatively measured after mask...In this work,glutathione capped CdTe QDs(GSH-QDs)were prepared through a one-pot process and found to be quenched by Cr^3+,Ag^+and Cu^2+ions.Cr^3+and chromium(III)picolinate could be quantitatively measured after masking Cu^2+and Ag+ions by sulfide.Under optimal conditions,linear quenching was observed for Cr^3+in the ranges of 0–2.0M and the limit of detection was 3.0 nM.The recoveries for Cr^3+in vitamin supplements obtained were from 92.5%to 106%.The determination results of chromium(III)picolinate in vitamin supplement samples were compared to that obtained using flame atomic absorption spectrometry(FAAS)method,and the result showed good reliability.展开更多
文摘采用简单液相沉积法制备了分级结构Cd S QDs/Bi OCl复合光催化剂,以XRD,SEM,TEM,HRTEM,XPS,EDS,UV-Vis DRS,PL等测试方法分别表征了样品的物相、形貌、组成、元素含量、光吸收性能以及光电特性,并以罗丹明B(Rh B)和苯酚为模型污染物,分别在可见光和紫外光下评价Cd S QDs/Bi OCl复合光催化剂的催化性能。测试结果表明,粒径为5.5μm的Bi OCl微球由大量纳米片有序堆积而成,所负载的粒径为10~20 nm的Cd S QDs均匀分布在Bi OCl纳米片表面。与纯Bi OCl和Cd S QDs/Bi OCl相比,Cd S QDs/Bi OCl-3%表现出最佳的光催化性能,其对Rh B和苯酚的降解速率常数分别是纯Bi OCl的2.6倍和5.3倍。Cd S QDs/Bi OCl复合光催化剂性能的提高可归结于,分级结构Bi OCl有效防止了片层堆积,有助于Cd S QDs的负载,另外,Cd S QDs的负载拓展了复合光催化剂的光吸收性能,均匀分布的Cd S QDs与Bi OCl形成的异质结促进了光生电子-空穴对的有效分离。
文摘Semiconductor quantum dots(QDs) were used for labeling many biomacromolecules and small molecules,but it remains a challenge to couple it with short active peptides without any limitation,which play critical roles in many physiological processes.Several coupling methods known about QDs and short peptides have some limitations.In this research,we report a method for the synthesis of QDs labeled peptides to be appropriate to any short peptide.The QDs(CdTe)-labeled short peptides were verified and characterized by RP-HPLC.The result shows that the surface of the T cell treated with QDs-TP5 emits yellow fluoresence.These results indicate that QDs-TP5 tends to aggregate on the surface of T cells.They were applied to monitoring the specific binding between the immune peptides and T cell surface receptors.The binding and the resultant fluorescence were observed and monitored by fluorescence microscope in vitro.The QDs-labeled immune peptides provide a powerful method for studying the immune modulating activity of TP5 in vivo.
基金Supported by the Advanced Membrane Technology Research Center of the Universities Teknologi Malaysia under Grant No R.J130000.7609.4C112the Postdoctoral Grantthe Frontier Materials Research Alliance
文摘Measuring the growth parameters of Ge quantum dots （QDs） embedded in SiO2/Si hetero-structure is pre- requisite for developing the optoelectronic devices such as photovoltaics and sensors. Their optical properties can be tuned by tailoring the growth morphology and structures, where the growth parameters＇ optimizations still need to be explored. We determine the effect of annealing temperature on surface morphology, structures and optical properties of Ge//SiO2//Si hetero-structure. Samples are grown via rf magnetron sputtering and subsequent characterizations are made using imaging and spectroscopic techniques.
文摘目的制备毒性低,生物相容性好的新型半导体量子点。方法以还原型谷胱甘肽（GSH）为硫源和稳定剂,采用水热法合成Cd Te/Cd S QDs。结果制备的GSH包裹的Cd Te/Cd S QDs波长范围覆盖400~800 nm的区域,量子产率高达83.1%,平均粒径约为3 nm。结论该Cd Te/Cd S QDs制备方法简便,成本低,有效降低了量子点生物毒性。
文摘In this work the enhanced molecularly imprinted optosensing material based on graphene oxide-quantum dots （ GO- QDs） was synthesized for highly selective and sensitive specific recognition of the target protein, bovine serum albumin （BSA）. Here, GO was introduced to enhance the efficiency of mass-transfer in recognition of target protein. Molecularly imprinted polymer coated GO-QDs using BSA as template （BMIP-coated GO-QDs ） exhibited a fast mass-transfer speed, which could be ascribed to the high volume of efficient surface area and high target recognition efficiency of the synthesized nanoscale device. Under optimal conditions, it was found that the BSA as target protein could remarkably quench the relative fluorescence intensity of BMIP- coated GO-QDs linearly in a concentration-dependent manner that was best described by a Stern-Volmer equation. The Ksv （Stern- Volmer constant） for template BSA was much higher than bovine hemoglobin （BHb） and lysozyme （Lyz）, implying a highly selective recognition ability of the BMIP-coated GO-QDs to BSA. This enhanced fluorescent nanoscale device may provide opportunities to develop a system that is efficient and effective and has potential in the design of highly effective fluorescent receptor for recognition of target protein in Droteomics studies.
基金Funded by the National Natural Science Foundation of China(No.61205062)the Hubei Provincial Department of Education Scientific Research Program Guidance Project(No.B2020282)。
文摘The active oxygen species in the catalytic oxidation system of Fe(Ⅲ)PcTs-t-BuOOH were identified,and the mechanism of the catalytic oxidation of phenolic substrates was proposed.Quinone imine molecules,the main products of catalytic oxidation reaction,can be adsorbed on the surface of CdTe QDs,resulting in their fluorescence quenching.A dual function of catalytic oxidation and fluorescence sensing was developed for the determination of dichlorophenol(DCP)based on the Fe(Ⅲ)PcTs-BuOOH-CdTe QDs system.The linear detection range of DCP was 1×10^(-6)-1.3×10^(-4) mol/L,and the detection limit 2.4×10^(-7) mol/L.This method was characterized by high selectivity,good repeatability and desirable stability,presenting promising potentials for analyzing DCP concentration in real water samples.
基金financially supported by the National Key R&D Program of China (Grant No. 2019YFB1503400)the National Natural Science Foundation of China (Grant No. 61804064)the Natural Science Foundation of Guangdong Province (Grant No.2019A1515011616)。
文摘The strong anisotropic electrical properties of one-dimensional(1 D) nanostructure semiconductors,especially the anisotropic carrier transport, have a negative and significant influence on the performance of solar cells if the nanostructures have random orientation. Considering the advantages of nanorod solar cells in carrier transport, we have achieved growth of vertically aligned Sb_(2)Se_(3) nanorod array with highly(hk1) orientation on Cd S substrate, and constructed superstrate nanorod solar cells for the first time. The Sb_(2)Se_(3) nanorod array solar cells exhibit the more efficient and long-range carrier transport in vertical direction. Furthermore, in order to suppress interface recombination, a CuInSe_(2) quantum dots(QDs) sensitizer has been applied to fill the volume between the nanorods completely, thus forming an interpenetrating nanocomposite structure. The CuInSe_(2) QDs can harvest additional light by absorption of visible light and contribute photocurrent. Meantime, the QDs function as a hole transport material and thus reduce the dependence of lateral transport. Consequently, the interpenetrating nanocomposite CuInSe_(2) / Sb_(2)Se_(3) solar cells display a power conversion efficiency of 7.54% with significant enhancements in the short-circuit current density and open-circuit voltage over pure Sb_(2)Se_(3) nanorod cells. This is the highest efficiency for superstrate solar cells based on Sb_(2)Se_(3) nanorod arrays.
文摘The synthesis of water-soluble quantum dots(QDs)has recently received extensive attention dueto noninvasive detection of biological information in living subjects.In this paper,high-qualitywater-soluble(cadmium-free)quaternary AgZnlnS QDs have been successfully synthesized usinga green synthetic route.The as-prepared QDs exhibit tunable photoluminescence(PL)emissionbetween 521 and 658 nm.Secondly,multidrug resistance(MDR)is a major impedinent to theeffective cancer chemot herapy,DOx,a widely used antit umor drug was modified on the surfaceof the QDs in this study.It,therefore,ignificantly enhanced the cytotoxicity of DX to MDRcancer cells as the QDs could bring the DoX to nucleus.
基金The work was supported by the National Natural Science Foundation of China(31371767)the National S&T support program of China(2015BAD17B02)+1 种基金Jiangsu Entry-Exit Inspection and Quarantine Bureau China(2017KJ19)the National Engineering Research Center for Functional Food,Jiangnan University and the Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province,Jiangnan University.
文摘In this work,glutathione capped CdTe QDs(GSH-QDs)were prepared through a one-pot process and found to be quenched by Cr^3+,Ag^+and Cu^2+ions.Cr^3+and chromium(III)picolinate could be quantitatively measured after masking Cu^2+and Ag+ions by sulfide.Under optimal conditions,linear quenching was observed for Cr^3+in the ranges of 0–2.0M and the limit of detection was 3.0 nM.The recoveries for Cr^3+in vitamin supplements obtained were from 92.5%to 106%.The determination results of chromium(III)picolinate in vitamin supplement samples were compared to that obtained using flame atomic absorption spectrometry(FAAS)method,and the result showed good reliability.
