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首页> 外文期刊>RSC Advances >Nanosilver rainbow: a rapid and facile method to tune different colours of nanosilver through the controlled synthesis of stable spherical silver nanoparticles
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Nanosilver rainbow: a rapid and facile method to tune different colours of nanosilver through the controlled synthesis of stable spherical silver nanoparticles

机译：Nanosilver Rainbow：通过控制合成的稳定球形银纳米粒子来调整纳米ilv的不同颜色的快速和容易的方法

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A rapid and simple one-pot reaction to synthesize stable, spherically shaped silver nanoparticles (AgNps) of different sizes producing distinct optical properties in aqueous solution at ambient temperature has been developed. Each system contains various sizes of silver nanoparticles showing rainbow colours with the peak wavelength of the absorption spectra ranging from 400 to 750 nm. Seven different colours of nano silver were developed through the controlled synthesis of spherical silver nanoparticles using silver nitrate as the metal precursor. Sodium borohydride was used as the main reducing agent and trisodium citrate and hydrazine sulphate were used as the stabilizing and auxiliary reducing agents respectively. The colour of the solution was controlled by varying the concentrations of reagents and the optimum conditions for all the colours are reported. Characterization of silver nanoparticles was carried out using UV-visible spectrophotometry and Transmission Electron Microscopy (TEM). Factors affecting the formation of different sizes of silver nanoparticles, such as silver nitrate concentration, reducing agent concentrations, reaction temperature and reaction pH are also reported. The stability of these coloured silver colloidal solutions was also investigated at different temperatures and the most stable temperature was found to be 4 °C, while the optimum pH to synthesize distinctively coloured silver nanoparticles was found to be in the range of 7–8. The outlined procedure provides a rapid, facile and reproducible synthetic route to spherical AgNps of varying size and ensuing optical properties. Thus, this method is certain to find value in the many applications where size tunability of AgNps is desired.
机译：已经开发了一种快速而简单的单罐反应，用于在环境温度下在水溶液中产生不同尺寸的不同尺寸的稳定，球形的银纳米颗粒（AgNP）。每个系统包含各种尺寸的银纳米粒子，显示彩虹色，吸收光谱的峰值波长范围为400至750nm。通过使用硝酸银作为金属前体的球形银纳米粒子的控制合成，开发了七种不同颜色的纳米银。使用硼氢化钠作为主要还原剂，柠檬酸三钠和硫酸氢钠分别用作稳定和辅助还原剂。通过改变试剂的浓度和报道所有颜色的最佳条件来控制溶液的颜色。使用UV可见分光光度法和透射电子显微镜（TEM）进行银纳米颗粒的表征。还报道了影响不同尺寸的银纳米颗粒的形成的因素，例如硝酸银浓度，还原剂浓度，反应温度和反应pH。还在不同温度下研究了这些色银胶体溶液的稳定性，发现最稳定的温度为4℃，而最佳pH合成独特颜色的银纳米颗粒的最佳pH值在7-8的范围内。所述概述程序提供了一种快速，容易和可再现的合成途径，可与不同尺寸和随后的光学性能的球形AGNP。因此，该方法肯定是在需要AGNP的大小可调性的许多应用中找到值。

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