Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India; Department of Chemistry, Tamralipta Mahavidyalaya, Tamluk, Purba Medinipur 721636, India.
Department of Polymer Science and Technology, University College of Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata 700 009, India.
Carbohydr Polym. 2014 Jul 17;107:151-7. doi: 10.1016/j.carbpol.2014.02.047. Epub 2014 Feb 22.
Gold and silver-gold alloy nanoparticles with mean diameter of 10nm and narrow size distribution were prepared by reduction of the correspondent metal precursors using aqueous dextran solution which acts as both a reducing and capping agent. The formation of nanoparticles was characterized by UV-vis spectroscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD) and dynamic light scattering (DLS). The silver and gold nanoparticles exhibited absorption maxima at 425 and 551 nm respectively; while for the bimetallic Ag-Au alloy appeared 520 nm in between them. TEM images showed monodispersed particles in the range of 8-10nm. The crystallinity of the nanoparticles was assured by XRD analysis. DLS data gave particle size distribution. The dextran stabilized Au nanoparticles used as a colorimetric sensor for detection and estimation of pesticide present in water. The dextran stabilized Ag-Au alloy nanoparticles exhibited interesting antimicrobial activity against bacteria at micromolar concentrations.
采用水相葡聚糖溶液作为还原剂和稳定剂，成功制备了平均粒径为 10nm、粒径分布较窄的金银合金纳米粒子。通过紫外-可见光谱、透射电子显微镜（TEM）、X 射线衍射（XRD）和动态光散射（DLS）对纳米粒子的形成进行了表征。银和金纳米粒子的吸收峰分别位于 425nm 和 551nm；而对于双金属 Ag-Au 合金，在它们之间出现了 520nm 的吸收峰。TEM 图像显示粒径在 8-10nm 范围内的单分散粒子。XRD 分析证实了纳米粒子的结晶度。DLS 数据给出了粒径分布。葡聚糖稳定的 Au 纳米粒子可用作比色传感器，用于检测和估计水中存在的农药。葡聚糖稳定的 Ag-Au 合金纳米粒子在微摩尔浓度下对细菌表现出有趣的抗菌活性。
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