共查询到19条相似文献,搜索用时 109 毫秒
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本文利用一种绿色合成工艺,采用巯基乙酸作为配体,在水溶液中成功合成了水溶性的Cu∶CdS纳米晶。利用X射线衍射分析(XRD)、傅里叶变换红外光谱(FT-IR)、场发射扫描电镜显微分析(FE-SEM)、能量色散X射线谱(EDX)、紫外可见(UV-Vis)吸收光谱对样品的晶体学性质、结构、形貌、成分、吸收光谱性质进行了系统的研究。着重研究了掺杂浓度对Cu∶CdS纳米晶的晶体学性质及吸收光谱的影响。结果表明:合成的Cu∶CdS纳米晶为立方相,通过谢乐公式估算的平均晶粒尺寸约为2 nm;随着掺杂浓度的增加,产物的晶胞参数也逐渐增大,表明Cu离子已经掺入到CdS纳米晶中,该发现与EDX结果相吻合。FT-IR红外光谱发现,配体巯基乙酸成功包覆在纳米晶的表面。UV-vis吸收谱表明,掺杂后的Cu∶CdS纳米晶的吸收峰向长波长方向移动。这种红移主要是Cu离子在CdS纳米晶中的掺杂而形成电子能级跃迁所致。 相似文献
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采用硫脲做为表面修饰剂,合成了硫脲表面修饰的掺杂Cd2 的ZnS纳米晶(ZnS∶Cd/SC(NH2)2),用X射线粉末衍射、透射电子显微镜、红外光谱以及荧光光谱等手段进行了表征.实验结果表明,Cd2 掺入了ZnS纳米晶中,硫脲分子中的S原子与该纳米晶表面的金属离子存在配位作用,ZnS∶Cd/SC(NH2)2纳米晶为分散性较好、平均粒径7 nm的球形粒子且具有良好的荧光性质. 相似文献
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采用有机金属液相法,在较低温度下制备了高质量的荧光CdS纳米晶.TEM、UV-Vis、PL及XRD等研究表明,表面活性剂的浓度、反应时间及反应物配比等对所制备的CdS纳米晶的形貌与尺寸、光谱性能及结晶性能等具有显著的影响.控制合适的反应条件,可以获得单分散、光谱性能优异且结晶性好的CdS纳米晶. 相似文献
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CdS纳米晶与多肽相互作用研究 总被引:10,自引:1,他引:10
研究了半导体CdS纳米晶的表面功能化及荧光光谱特性,并利用静电/配位自组装方法实现了多肽和CdS纳米晶的生物无机偶联,研究了纳米晶多肽偶联体系的荧光光谱以及多肽与CdS纳米晶之间的相互作用.结果表明:含巯基多肽对CdS纳米晶表面形成完善包覆,消除CdS纳米晶表面缺陷,使CdS纳米晶荧光增强;含端氨基多肽使CdS纳米晶荧光出现先升后降趋势;其余不含巯基和氨基的多肽均猝灭CdS纳米晶荧光,猝灭机制属于形成化合物所引起的静态猝灭,它们的结合常数约为2×104,结合位点数约为0.87~1.00. 相似文献
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本文报道在Sol-gel基材中制备由聚合物稳定的CdS纳米晶的新方法, 即通过甲基丙烯酸镉与甲基丙烯酸羟乙酯共聚合合成了含有Cd 2+的聚合物微凝胶, 在聚合物微凝胶网络中原位聚合正硅酸乙酯形成聚合物互穿的Sol-gel复合基材. 再向该聚合物/二氧化硅复合基材中通入H2S气体得到CdS纳米晶. 在聚合物网络中原位聚合正硅酸乙酯可以降低纯二氧化硅材料的脆性; 另一方面, 二氧化硅可以作为增强剂增加聚合物材料的强度. 因此, 在我们合成的聚合物/二氧化硅复合基材中制备的CdS纳米晶将具有很好的应用前景. 相似文献
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CdS纳米晶与多肽分子相互作用研究 总被引:2,自引:0,他引:2
研究了半导体CdS纳米晶的表面功能化及荧光光谱特性, 并利用静电/配位自组装方法实现了多肽和CdS纳米晶的生物无机偶联, 研究了纳米晶多肽偶联体系的荧光光谱以及多肽与CdS纳米晶之间的相互作用. 结果表明: 含巯基多肽对CdS纳米晶表面形成完善包覆, 消除CdS纳米晶表面缺陷, 使CdS纳米晶荧光增强; 含端氨基多肽使CdS纳米晶荧光出现先升后降趋势; 其余不含巯基和氨基的多肽均猝灭CdS纳米晶荧光, 猝灭机制属于形成化合物所引起的静态猝灭, 它们的结合常数约为2×104, 结合位点数约为0.87~1.00. 相似文献
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低温固相反应法合成水分散性CdS纳米晶 总被引:9,自引:0,他引:9
A novel solid-state method for the preparation of the CdS nanoparticles at the room temperature has been developed. The nanoparticles were characterized with FT-IR, XRD, TEM, XPS and PL techniques. The results indicated that the surfaces of the CdS nanoparticles were modified with sodium thioglycollate and thus they were water-dispersive. The mean particle size was about 3~5 nm. A blue shift has been observed in the photoluminescence emission spectrum. 相似文献
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纳米ZnS,CdS水热合成及其表征 总被引:24,自引:0,他引:24
纳米ZnS、CdS水热合成及其表征苏宜,谢毅,陈乾旺,钱逸泰(中国科学技术大学应用化学系合肥230026)关键词硫化锌,硫化镉,水热技术ⅡB~ⅥA族化合物是主要的半导体发光材料,广泛应用于各种发光与显示装置[1]可采用气相反应、固气相反应及液相反应等... 相似文献
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Paola Fini N. Depalo R. Comparelli M. L. Curri M. Striccoli M. Castagnolo A. Agostiano 《Journal of Thermal Analysis and Calorimetry》2008,92(1):271-277
The dispersibility of organic capped nanocrystals (NCs) in diverse solvents is one of the key factor of the success of such
a class of nanostructured materials. In this work the α-cyclodextrins, mediated phase transfer has been considered as an effective
procedure to direct the NC transfer from the organic solvent to water. The effect of the original organic solvent, namely
hexane and chloroform, and of the ligand molecule coordinating CdS nanocrystal surface has been investigated by optical (UV-Vis,
Photoluminescence, FTIR, Dynamic Light Scattering) and calorimetric techniques.
The calorimetric investigation has been carried out by performing dilution experiments and the correlation between thermal
effects and dilution ratio has been evaluated using the McMillan approach. The obtained results have provided relevant insight
on the parameters driving the phase transfer process and on the NC mutual interaction, thus resulting valuable on the effectiveness
of the phase transfer procedure. 相似文献
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Family 373 and 406 of CdS magic-sized nanocrystals(MSNCs) were synthesized by a one-pot non-injection approach and white-light emission was generated from the coexistence of them.This light had excellent color characteristics,as defined by their pure white CIE(Commission International de I’Eclairage) color coordinates(0.328,0.343),and it correlated with a color temperature of 5696 K.A probable thermodynamic equilibrium was proposed to explain the white-light emission behavior in this letter. 相似文献
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CdS and CdS/ZnS core-shell structure nano particles were synthesized in micro emulsion, and characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM), UV absorption spectra and PL. The average diameter of CdS was about 3.3 nm, and CdS/ZnS core-shell structure was confirmed by XRD and UV. Considering the optical properties of CdS/ZnS core-shell structure nanoparticles which have different ZnS shell thickness, the UV absorption edge of CdS/ZnS becomes as lightred-shift with the thickness of ZnS layer increasing, and the absorption of shortwave band is strongly enhanced at the same time. The PL spectra indicate that ZnS shell layer can greatly eliminate surface defects of CdS nanoparticles and make its band-edge directed recombination increased, and the luminous efficiency of CdS is improved greatly when it has appropriate shell thickness. 相似文献