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Fabrication of Cu_2O@Cu_2O core-shell nanoparticles and conversion to Cu_2O@Cu core-shell nanoparticles in solution 被引量:3
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作者 杨爱玲 李顺嫔 +3 位作者 王玉金 王乐乐 包西昌 杨仁强 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第11期3643-3650,共8页
Cu2O@Cu2O core-shell nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Cu2O@Cu2O NPs were easily converted to Cu2O@Cu NPs with the help of polyvinylpyrrolidine (PVP) and excessive a... Cu2O@Cu2O core-shell nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Cu2O@Cu2O NPs were easily converted to Cu2O@Cu NPs with the help of polyvinylpyrrolidine (PVP) and excessive ascorbic acid (AA) in air at room temperature, which was an interesting phenomenon. The features of the two kinds of NPs were characterized by XRD, TEM and extinction spectra. Cu2O@Cu NPs with different shell thicknesses showed wide tunable optical properties for the localized surface plasmon (LSP) in metallic Cu. But Cu2O@Cu2O NPs did not indicate this feature. FTIR results reveal that Cu+ ions on the surface of Cu2O shell coordinate with N and O atoms in PVP and are further reduced to metallic Cu by excessive AA and then form a nucleation site on the surface of Cu2O nanocrystalline. PVP binds onto different sites to proceed with the reduction utill all the Cu sources in Cu2O shell are completely assumed. 展开更多
关键词 cu2O@cu2O core-shell nanoparticles cu2O@cu core-shell nanoparticles solution phase strategy reducing agent tunable optical properties polyvinylpyrrolidine
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Preparation and photocatalytic performance of Cu-doped TiO_2 nanoparticles 被引量:6
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作者 杨希佳 王姝 +2 位作者 孙海明 王晓兵 连建设 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第2期504-509,共6页
Cu-doped TiO2 nanoparticles with different doping contents from 0 to 2.0% (mole fraction) were synthesized through sol-gel method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and field emissi... Cu-doped TiO2 nanoparticles with different doping contents from 0 to 2.0% (mole fraction) were synthesized through sol-gel method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscope (FE-SEM) were used to characterize the crystalline structure, chemical valence states and morphology of TiO2 nanoparticles. UV-Vis absorption spectrum was used to measure the optical absorption property of the samples. The photocatalytic performance of the samples was characterized by degrading 20 mg/L methyl orange under UV-Vis irradiation. The results show that the Cu-doped TiO2 nanoparticles exhibit a significant increase in photocatalytic performance over the pure TiO2 nanoparticles, and the TiO2 nanoparticles doped with 1.0% Cu show the best photocatalytic performance. The improvement in photocatalytic performance is attributed to the enhanced light adsorption in UV-Vis range and the decrease of the recombination rate of photoinduced electron-hole oair of the Cu-doped TiO2 nanoparticles. 展开更多
关键词 TIO2 cu nanoparticles PHOTOCATALYSIS DOPING sol-gel method
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Solid-phase synthesis of Cu2MoS4 nanoparticles for degradation of methyl blue under a halogen-tungsten lamp 被引量:4
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作者 Shi-na Li Rui-xin Ma Cheng-yan Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第3期310-314,共5页
The Cu_2MoS_4 nanoparticles were prepared using a relatively simple and convenient solid-phase process, which was applied for the first time. The crystalline structure, morphology, and optical properties of Cu_2MoS_4 ... The Cu_2MoS_4 nanoparticles were prepared using a relatively simple and convenient solid-phase process, which was applied for the first time. The crystalline structure, morphology, and optical properties of Cu_2MoS_4 nanoparticles were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and UV-vis spectrophotometry. Cu_2MoS_4 nanoparticles having a band gap of 1.66 eV exhibits good photocatalytic activity in the degradation of methylene blue, which indicates that this simple process may be critical to facilitate the cheap production of photocatalysts. 展开更多
关键词 cu2MoS4 nanoparticles SOLID-PHASE synthesis DEGRADATION PHOTOCATALYST METHYL blue
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A Solvothermal Route to Cu_2O Nanocubes and Cu Nanoparticles
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作者 TANG Xin-ling REN Ling +3 位作者 SUN Ling-na TIAN Wei-guo CAO Min-hua HU Chang-wen 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2006年第5期547-551,共5页
Cu2O nanocubes and Cu nanoparticles were prepared by reducing Cu( Ⅱ ) salt with ethanol as the reducing agent and solvent in the presence of multidentate ligand poly(vinylpyrrolidone) (PVP) under different cond... Cu2O nanocubes and Cu nanoparticles were prepared by reducing Cu( Ⅱ ) salt with ethanol as the reducing agent and solvent in the presence of multidentate ligand poly(vinylpyrrolidone) (PVP) under different conditions. The morphologies and the crystalline structures of the products were characterized by using scanning electron microscopy (SEM), transmission electron microscopy(TEM), selected-area electron diffraction( SAED), and powder X-ray diffraction(XRD). In particular, the influences of the solvothennal reaction temperature and alkalinity on the products were investigated. A lower temperature and a lower alkali concentration favor the formation of the Cu2O phase, whereas a higher temperature and a higher alkali concentration generally lead to the formation of the Cu phase. 展开更多
关键词 cu2O nanocube cu nanoparticle ETHANOL Poly(vinylpyrrolidone) Selective synthesis
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Synthesis of Cu_2ZnSnS_4 thin film from mixed solution of Cu_2SnS_3 nanoparticles and Zn ions
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作者 Zheng-fu TONG Jia YANG +6 位作者 Chang YAN Meng-meng HAO Fang-yang LIU Liang-xing JIANG Yan-qing LAI Jie LI Ye-xiang LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第8期2102-2108,共7页
The Cu2ZnSnS4 thin film was prepared by a facile solution method without vacuum environment and toxic substance. The formation mechanism of the film was studied by transmission electron microscopy (TEM), X-ray diffrac... The Cu2ZnSnS4 thin film was prepared by a facile solution method without vacuum environment and toxic substance. The formation mechanism of the film was studied by transmission electron microscopy (TEM), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and Raman scattering measurements. Through cyclic voltammetry and photo-electricity tests, the electrocatalytic activity of the prepared film as the counter electrode of dye-sensitizedsolar cell was also studied. The results show that the mixed precursor solution mainly consists of Cu2SnS3 nanoparticles and Zn ions.After 550 °C annealing process on the precursor film prepared from the mixed solution, Cu2ZnSnS4 thin film is obtained. Besides, itis found that the prepared Cu2ZnSnS4 thin film has the electrocatalytic activity toward the redox reaction of I3?/I? and the dye-sensitized solar cell with the prepared Cu2ZnSnS4 thin film as the counter electrode achieves the efficiency of 1.09%. 展开更多
关键词 cu2ZnSnS4 thin film cu2SnS3 nanoparticle Zn ion ELECTROCATALYTIC dye-sensitized solar cells
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The Physical Properties and Photocatalytic Activity of CulTEA Doped TiO2-Nanoparticles Prepared by the Sol-Gel Process
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作者 Weerachai Sangchay Weerachai Mudtharak Kuntapon Mahamad Aurasa Namesai 《Journal of Chemistry and Chemical Engineering》 2012年第8期744-747,共4页
Cu/TEA-doped TiO2 nanoparticles were prepared by the sol-gel process. Titanium (IV) isoproxide, copper (II) nitrate trihydrate and triethanolamine were used as precursors and calcined at a temperature of 400℃ for... Cu/TEA-doped TiO2 nanoparticles were prepared by the sol-gel process. Titanium (IV) isoproxide, copper (II) nitrate trihydrate and triethanolamine were used as precursors and calcined at a temperature of 400℃ for 2 h with a heating rate of 10℃/min to produce powders. Different interstitial amounts of TEA were added in the range of 0 mol% to 15 mol% of TiO2. The X-ray diffractrometer patterns show the TiO2 nanocomposites have a high anatase phase. It was also apparent that doped TEA has an effect on the crystallite size of TiO2 composite nanoparticles. The morphology of the composite powders was characterized by scanning electron microscope. The photocatalytic activity of Cu/TEA-doped TiO2 nanoparticles was evaluated through the degradation of methylene blue under UV irradiation. The results showed that 1 mol% TEA of TiO2 nanocomposites exhibited high photocatalytic activity and a small crystallite size. 展开更多
关键词 TIO2 cu TEA nanoparticles sol-gel.
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Radio Pet Therapy of Healthy Wistar Rats with <sup>64</sup>CuCl<sub>2</sub>Labeled to <sup>64</sup>Cu(AcAc)<sub>2</sub>Supported in Functionalized TiO<sub>2</sub>Nanoparticles
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作者 Tessy López Juan C. Manrique-Arias +2 位作者 Paola Ramírez Pamela Larraza Francisco Rodríguez Reinoso 《Journal of Encapsulation and Adsorption Sciences》 2017年第3期121-126,共6页
In recent years Copper-64 in the chemical form of copper chloride ([64Cu]CuCl2) has been identified as a potential agent for PET imaging and radionuclide therapy. The aim of this research was to determine the biodistr... In recent years Copper-64 in the chemical form of copper chloride ([64Cu]CuCl2) has been identified as a potential agent for PET imaging and radionuclide therapy. The aim of this research was to determine the biodistribution and the labeling of radio nanoparticle with 64CuCl2, the nanoparticles Cu(acac)2/F-TiO2 were mixed with 64CuCl2 (20-37 MBq), then the final solution was used to injected healthy Wistar rats to probe the absorption of nanoparticle inside tissue trough of the groups OH that are formed during the functionalization of the Cu(acac)2/F-TiO2. The “in vivo” evaluation after realize the images study in micro PET equipment, uptake of the radio-nanoparticle was observed in the digestive system in the healthy Wistar rats. 展开更多
关键词 PET THERAPY nanoparticles FUNCTIONALIZED Titania (F-Tio2) Titanium Acetylacetonate [cu (AcAc)2] cu(Acac)2/F-Tio2 PET Lesion Detection Imaging
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Effects of reaction parameters on preparation of Cu nanoparticles via aqueous solution reduction method with NaBH_4 被引量:1
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作者 刘清明 周德璧 +2 位作者 Yu-ya YAMAMOTO Kensuke KURUDA Masazumi OKIDO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期2991-2996,共6页
The preparation of Cu nanoparticles by the aqueous solution reduction method was investigated. The effects of different reaction parameters on the preparation of Cu nanoparticles were studied. The optimum conditions f... The preparation of Cu nanoparticles by the aqueous solution reduction method was investigated. The effects of different reaction parameters on the preparation of Cu nanoparticles were studied. The optimum conditions for preparing well-dispersed nanoparticles were found as follows: 0.4 mol/L NaBH4 was added into solution containing 0.2 mol/L Cu2+, 1.0% gelatin dispersant in mass fraction, and 1.2 mol/L NH3?H2O at pH 12 and 313 K. In addition, a series of experiments were performed to discover the reaction process. NH3?H2O was found to be able to modulate the reaction process. At pH=10, Cu2+ was transformed to Cu(NH3)42+ as precursor after the addition of NH3?H2O, and then Cu(NH3)42+ was reduced by NaBH4 solution. At pH=12, Cu2+ was transformed to Cu(OH)2 as precursor after the addition of NH3?H2O, and Cu(OH)2 was then reduced by NaBH4 solution. 展开更多
关键词 cu nanoparticles NABH4 cu(OH)2 cu(NH3)42+ aqueous solution reduction method PREcuRSOR reaction process
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Cu2-xS和Cu2-xSe类液态材料的可控制备与热电性能研究进展 被引量:3
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作者 林锦豪 谢华清 +2 位作者 吴子华 李奕怀 王元元 《材料导报》 EI CAS CSCD 北大核心 2020年第7期71-81,共11页
在高速发展的21世纪,随着化石能源的日渐枯竭,人们开始把目光投放到新能源的开发。其中,热电技术的研究和发展受到广泛关注。基于热电材料的热电发电技术能够将热能直接转换为电能,相关器件和系统具有体积小、质量轻、坚固、无传动部件... 在高速发展的21世纪,随着化石能源的日渐枯竭,人们开始把目光投放到新能源的开发。其中,热电技术的研究和发展受到广泛关注。基于热电材料的热电发电技术能够将热能直接转换为电能,相关器件和系统具有体积小、质量轻、坚固、无传动部件、无噪声运行、安全可靠、易于控制等优点。热电优值(ZT)是评价热电性能的参数,ZT=S 2σT/κ,其中S是泽贝克系数,σ是电导率,T是绝对温度,κ是热导率。当ZT值达到1以上时,说明热电材料达到商业应用的基本要求。近年来,多类性能出色的热电材料被发现并得到深入研究。“声子液体-电子晶体”(PLEC)类材料概念被提出后,就凭借其超低热导率特征而受到了广泛关注。作为典型的PLEC类材料,Cu-S系材料备受关注并得到较为深入的研究,其中以Cu2S和Cu2Se为主,它们都是本征p型半导体材料,具有低的热导率。在结构上,两种半导体随着温度的升高,都会发生结构相变,其中,723 K的α-Cu2S和400 K的β-Cu2Se为立方相,具有很低的热导率。在α-Cu2S中,Cu离子在S原子组成的刚性亚点阵中具有类液体的迁移行为,成为液态亚点阵。液态亚点阵对格波声子的横向传输具有很强的扰动,减少了热传导的横模数目,导致定容比热、声子平均速率和声子平均自由程的减小,使Cu 2S具有很低的热导率。在制备方法上,Cu2-xS和Cu2-xSe均可采用纳米材料常见的合成方法——水热法和前驱体法,这两种合成方法均具有操作简单、成本低、粒径小和可灵活调控的优点。掺杂、复合是改善Cu2-xS和Cu2-xSe性能的常见手段,通过这两种方法改善其电导率或者改变其结构能够得到更低的热导率,从而获得更好的热电性能。如通过在S位上掺杂Te形成Cu 2S 0.52 Te 0.48,此化合物为纳米级马赛克结构,在1000 K时,其ZT值达到2.1。在Se位上掺杂S形成Cu 2Se 0.8 S 0.2,不仅能降低声子的散射速度,还能引入额外的点缺陷散射声子,进一步降低复合块体的热导率,在950 K时,ZT值达到1.65。本文以PLEC类材料中的Cu2S和Cu2Se热电材料为主要对象,简要介绍其结构和性能,概述其常见的制备方法和最近提出的新型合成方法,综述其性能的改善方法及最新研究进展。 展开更多
关键词 热电材料 PLEC类材料 cu2-xS cu2-xse
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Exploring the impact of Nafion modifier on electrocatalytic CO_(2) reduction over Cu catalyst 被引量:1
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作者 Yingshi Su Yonghui Cheng +6 位作者 Zhen Li Yanjia Cui Caili Yang Ziyi Zhong Yibing Song Gongwei Wang Lin Zhuang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第1期543-551,I0012,共10页
Nafion as a universal polymer ionomer was widely applied for nanocatalysts electrode preparation.However,the effect of Nafion on electrocatalytic performance was often overlooked,especially for CO_(2)electrolysis.Here... Nafion as a universal polymer ionomer was widely applied for nanocatalysts electrode preparation.However,the effect of Nafion on electrocatalytic performance was often overlooked,especially for CO_(2)electrolysis.Herein,the key roles of Nafion for CO_(2)RR were systematically studied on Cu nanoparticles(NPs)electrocatalyst.We found that Nafion modifier not only inhibit hydrogen evolution reaction(HER)by decreasing the accessibility of H_(2)O from electrolyte to Cu NPs,and increase the CO_(2)concentration at electrocatalyst interface for enhancing the CO_(2)mass transfer process,but also activate CO_(2)molecule by Lewis acid-base interaction between Nafion and CO_(2)to accelerate the formation of^(*)CO,which favor of C–C coupling for boosting C_(2)product generation.Owing to these features,the HER selectivity was suppressed from 40.6%to 16.8%on optimal Cu@Nafion electrode at-1.2 V versus reversible hydrogen electrode(RHE),and as high as 73.5%faradaic efficiencies(FEs)of C_(2)products were achieved at the same applied potential,which was 2.6 times higher than that on bare Cu electrode(~28.3%).In addition,Nafion also contributed to the long-term stability by hinder Cu NPs morphology reconstruction.Thus,this work provides insights into the impact of Nafion on electrocatalytic CO_(2)RR performance. 展开更多
关键词 Nafion modifier CO_(2)reduction cu nanoparticles In situ ATR-SEIRAS C_(2)product
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Cu2-xSe-AIPH纳米材料的合成及体外抗癌性能研究 被引量:2
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作者 陆娟 毛旖旎 杨骏 《聊城大学学报(自然科学版)》 2021年第1期55-61,共7页
通过高温热解法合成Cu2-xSe纳米粒子,在水溶液中经过氨基化聚乙二醇修饰后负载上化合物2,2′-偶氮二[2-(2-咪唑啉-2-基)丙烷]二盐酸盐(AIPH)。得到的纳米材料在近红外激光(808 nm)照射下,可以诱导光热效应并利用热量促进生成有毒的AIPH... 通过高温热解法合成Cu2-xSe纳米粒子,在水溶液中经过氨基化聚乙二醇修饰后负载上化合物2,2′-偶氮二[2-(2-咪唑啉-2-基)丙烷]二盐酸盐(AIPH)。得到的纳米材料在近红外激光(808 nm)照射下,可以诱导光热效应并利用热量促进生成有毒的AIPH自由基,从而可以有效地杀死癌细胞。通过体外一系列实验可以初步证明Cu2-xSe-AIPH纳米材料有着较强的光热转换能力、良好的生物相容性以及抗癌性能。 展开更多
关键词 cu2-xse纳米粒子 AIPH 光热效应 抗癌性能
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Synthesis of Cu nanoparticles by chemical reduction method 被引量:1
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作者 M. S. AGUILAR R. ESPARZA G. ROSAS 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第7期1510-1515,共6页
Cu nanoparticles (CuNPs) have been synthesized through an easy route by chemical reduction at room temperature. The Cu^2+ ions were reduced and stabilized with sodium borohydride and polyvinylpyrrolidone, respectively... Cu nanoparticles (CuNPs) have been synthesized through an easy route by chemical reduction at room temperature. The Cu^2+ ions were reduced and stabilized with sodium borohydride and polyvinylpyrrolidone, respectively. The effect of the variation of the reducing agent/precursor-salt (RA/PS) ratio on the size and morphology of the CuNPs was evaluated. The synthesized material was studied by ultraviolet-visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The UV-Vis spectra showed a CuNPs plasmon peak at 569 nm and another peak belonging to Cu2O at 485 nm. XRD analysis showed the fcc-Cu phase with a small amount of fcc-Cu2O compound. SEM and TEM studies displayed that small semispherical CuNPs of approximately 7 nm were obtained at the RA/PS ratio of 2.6. The excess of polyvinylpyrrolidone stabilizer played an essential role in preventing CuNPs oxidation. On the other side, Cu2O polyhedral particles with larger sizes up to 150 nm were identified in the RA/PS ratio range of 2.0-1.84. In addition, Cu2O particles having star morphologies with quantum confinement at their tips were obtained at the RA/PS ratio of 1.66. 展开更多
关键词 cu nanoparticles NABH4 chemical reduction polyvinylpyrrolidone stabilization cu2O
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Improvement in efficiency of solar cell by removing Cu2-xSe from CIGS film surface 被引量:1
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作者 李伟 孙云 +2 位作者 刘伟 李风岩 周琳 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第4期878-881,共4页
CIGS thin films are deposited by sputtering and selenization, The synthesis of semiconducting polycrystalline thin films and characteristics of devices based on the CIGS absorbing layers are investigated. Their micros... CIGS thin films are deposited by sputtering and selenization, The synthesis of semiconducting polycrystalline thin films and characteristics of devices based on the CIGS absorbing layers are investigated. Their microstructures are characterized by x-ray diffraction and Raman spectroscopy, The results reveal that there exist metallic Cu2-xSe compounds in CIGS film surfaces and the compounds are thought to be responsible for the degradation of the open circuit voltage of solar cells. The optimization of selenization temperature profile and copper content in the precursor surfaces is studied, concluding that the conversion efficiency may be improved by removing metallic Cu2-xSe compounds from the surfaces of CIGS thin films. 展开更多
关键词 cu2-xse CIGS thin films optimization of temperature profile
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Optical and electrical characterizations of nanoparticle Cu_2S thin films 被引量:1
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作者 M.Saadeldin H.S.Soliman +1 位作者 H.A.M.Ali K.Sawaby 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第4期476-481,共6页
Copper sulfide thin films are deposited onto different substrates at room temperature using the thermal evaporation technique. X-ray diffraction spectra show that the film has an orthorhombicchalcocite (7-Cu2S) phas... Copper sulfide thin films are deposited onto different substrates at room temperature using the thermal evaporation technique. X-ray diffraction spectra show that the film has an orthorhombicchalcocite (7-Cu2S) phase. The atomic force microscopy images indicate that the film exhibits nanoparticles with an average size of nearly 44 nm. Specrtophotometric measurements for the transmittance and reflectance are carried out at normal incidence in a spectral wavelength range of 450 nm-2500 nm. The refractive index, n, as well as the absorption index, k is calculated. Some dispersion parameters are determined. The analyses of el and e2 reveal several absorption peaks. The analysis of the spectral behavior of the absorption coefficient, c~, in the absorption region reveals direct and indirect allowed transitions. The dark electrical resistivity is studied as a function of film thickness and temperature. Tellier's model is adopted for determining the mean free path and bulk resistance. 展开更多
关键词 physical properties of cu2S thermal evaporation nanoparticle cu2S thin films
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三维非计量Cu2-xSe光催化剂的制备及其对甲醛降解研究
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作者 郭超 杨丽霞 《南昌航空大学学报(自然科学版)》 CAS 2019年第2期81-88,共8页
为了制备能够吸收更长波段光源,可以用时利用太阳光的可见光区域和红外光区域的光催化剂,以商业Cu网为模板,通过牺牲模板法制备三维非化学计量Cu2-xSe/Cu光催化剂。将Cu网浸没在含有硒粉、NaOH和NaBH4的Se2-溶液中。比较不同反应时间的... 为了制备能够吸收更长波段光源,可以用时利用太阳光的可见光区域和红外光区域的光催化剂,以商业Cu网为模板,通过牺牲模板法制备三维非化学计量Cu2-xSe/Cu光催化剂。将Cu网浸没在含有硒粉、NaOH和NaBH4的Se2-溶液中。比较不同反应时间的催化剂,2 h得到的光催化剂性能最好。Cu2-xSe/Cu网在可见光和红外光区均能达到良好的响应。在红外光照射下Cu2-xSe/Cu网50 min可以完全降解10 ppm甲醛。在可见光和红外光照射下Cu2-xSe/Cu网40 min就能完全去除10 ppm甲醛,且10次循环实验光催化剂仍能保持高效的催化降解性能。三维的Cu2-xSe/Cu网体现了优异的降解甲醛性能,并且在红外光区域的性能也十分显著。 展开更多
关键词 光催化剂 非化学计量cu2-xse 红外光 甲醛
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Influence of Cu doping in Magnesium Hydroxide Nanoparticles for Bandgap Engineering
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作者 SYED Masood Raza S NASEEM Shah +1 位作者 ADEEL Tahir YASMEEN Bibi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2023年第3期485-489,共5页
Cu doped Mg(OH)_(2) nanoparticles were synthesized with varying concentrations from 0 to 10%by a chemical synthesis technique of coprecipitation.X-rays diffraction (XRD) of the samples confirms that all the samples ac... Cu doped Mg(OH)_(2) nanoparticles were synthesized with varying concentrations from 0 to 10%by a chemical synthesis technique of coprecipitation.X-rays diffraction (XRD) of the samples confirms that all the samples acquire the hexagonal crystal structure.XRD results indicated the solubility limit of dopant in the host material and the secondary phase of CuO was observed beyond 3%Cu doping in Mg(OH)_(2).The reduction in the size of nanoparticles was observed from 166 to 103 nm for Mg(OH)_(2) and 10% Cu doped Mg(OH)_(2)samples,respectively.The shift in absorption spectra exhibited the systematical enhancement in optical bandgap from 5.25 to 6.085 eV.A good correlation was observed between the bandgap energy and crystallite size of the nanocrystals which confirmed the size induced effect in the nanoparticles.The transformation in the sample morphology was observed from irregular spherical particles to sepals like shapes with increasing the Cu concentration in the host material.The energy dispersive X-Ray (EDX) analysis confirmed the purity of mass percentage composition of the elements present in the samples. 展开更多
关键词 cu doped Mg(OH)_(2) nanoparticles phase purity optical band gap MORPHOLOGIES
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原位反应纳米TiB_2/Cu复合材料的制备和微结构 被引量:28
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作者 王耐艳 涂江平 +5 位作者 杨友志 齐卫笑 刘芙 张孝彬 卢焕明 刘茂森 《中国有色金属学报》 EI CAS CSCD 北大核心 2002年第1期151-154,共4页
利用原位反应技术 ,通过控制反应物B2 O3 和石墨的含量制备了原位生长纳米TiB2 增强Cu基复合材料。用XRD ,EDS ,TEM对TiB2 /Cu原位复合材料进行微结构分析 ,研究表明铜基体中弥散分布着 5 0nm的TiB2颗粒 ,并对Cu基体有良好的增强作用。
关键词 原位反应 硼化钛 铜基复合材料 制备 微结构 纳米材料
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柠檬酸钠辅助光化学合成Cu_2-_xSe纳米晶 被引量:3
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作者 闫玉林 钱雪峰 +1 位作者 印杰 朱子康 《无机化学学报》 SCIE CAS CSCD 北大核心 2003年第10期1133-1136,共4页
近年来,纳米颗粒由于具有许多独特的物理、化学性能而引起人们的高度重视[1].硒化铜纳米晶也因其组成多样性且能广泛应用于太阳能电池,超离子导体等领域而成为学术界的研究热点之一.
关键词 柠檬酸钠 光化学合成 cu2-xse 纳米晶 硒化铜 配体 光化学辐射
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甲烷氧化菌素耦合脂肪酶生物传感器差分脉冲伏安法对Cu^(2+)的检测 被引量:2
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作者 王艳 赵宁 +4 位作者 王悦 李虹佳 辛嘉英 孙立瑞 关桦楠 《食品科学》 EI CAS CSCD 北大核心 2022年第16期351-358,共8页
利用甲烷氧化菌素(methanobactin,Mb)可特异性捕获Cu^(2+)的特点,构建Mb耦合脂肪酶生物传感器,并利用荧光光谱、紫外光谱、傅里叶变换红外光谱以及透射电子扫描电镜对制备成功的固定化脂肪酶(Lipase@AuNPs)结构和形貌进行表征。借助生... 利用甲烷氧化菌素(methanobactin,Mb)可特异性捕获Cu^(2+)的特点,构建Mb耦合脂肪酶生物传感器,并利用荧光光谱、紫外光谱、傅里叶变换红外光谱以及透射电子扫描电镜对制备成功的固定化脂肪酶(Lipase@AuNPs)结构和形貌进行表征。借助生物传感器监测脂肪酶水解三油酸甘油酯时电信号的响应情况,Cu^(2+)与Mb特异性接合并在脂肪酶周围产生富集现象,抑制脂肪酶的催化活性,电流强度显著下降,从而实现对Cu^(2+)的快速定性、超痕量反定量检测。结果表明:采用差分脉冲伏安法测得最优检测体系为底物三油酸甘油酯溶于Tirs-HCl缓冲溶液的质量浓度2 g/100 mL、缓冲液pH 7.5,当Cu^(2+)浓度为1~100 nmol/L范围内时,传感器电流差值与其线性关系良好,回归方程为y=0.228x+0.774 8,R^(2)=0.995 0,检出限为0.03 nmol/L(R_(SN)=3)。本研究建立的新型脂肪酶生物传感器检测Cu^(2+)的方法,具有较高的灵敏度、专一性和稳定性,为实现食品中痕量、超痕量的重金属检测提供一定的参考。 展开更多
关键词 甲烷氧化菌素 纳米金 脂肪酶生物传感器 差分脉冲伏安法 痕量cu^(2+)检测
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Cu^(2+)对掺Pb^(2+)的β-BaB_2O_4纳米材料发光特性的影响 被引量:1
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作者 邹文国 杨忠森 +2 位作者 吕孟凯 顾锋 王淑芬 《材料工程》 EI CAS CSCD 北大核心 2005年第9期19-21,共3页
采用共沉淀法合成了掺杂Cu2+,Pb2+的-βBaB2O4纳米材料,通过激发光谱和发射光谱研究了其发光性质,并探讨了Cu2+对Pb2+发光性能的影响。在-βBaB2O4:Pb2+的发射光谱中观察到位于630nm的强而稳定的发射峰。由于Cu2+和Pb2+在-βBaB2O4中形... 采用共沉淀法合成了掺杂Cu2+,Pb2+的-βBaB2O4纳米材料,通过激发光谱和发射光谱研究了其发光性质,并探讨了Cu2+对Pb2+发光性能的影响。在-βBaB2O4:Pb2+的发射光谱中观察到位于630nm的强而稳定的发射峰。由于Cu2+和Pb2+在-βBaB2O4中形成复合发光中心,Cu2+和Pb2+共掺样品的发射光谱与Pb2+单独样品的发射光谱有很大的不同,Pb2+在-βBaB2O4:Cu2+,Pb2+中的发光强度显著增强。 展开更多
关键词 β-BaB2O4纳米材料 发光 Pb^2+和cu^2+
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