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Rapid Microwave-Assisted Synthesis of Silver Nanoparticles in a Halide-Free Deep Eutectic Solvent
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-02-27 00:00:00 , DOI: 10.1021/acssuschemeng.8b00050
Laxmi Adhikari 1 , Nathaniel E. Larm 1 , Nakara Bhawawet 1 , Gary A. Baker 1
Affiliation  

Organosoluble silver nanoparticles (AgNPs) have been synthesized for the first time in a task-specific, halide-free, deep eutectic solvent (DES) using a simple and convenient wet chemical reduction route involving microwave (MW) heating with oleylamine (OAm) acting as a surfactant and reducing agent. Nanoparticle formation is extremely rapid and occurs within 30 s of microwave heating at 100 °C. The effects of various reaction parameters (e.g., synthesis temperature, MW irradiation time, maximal MW power, water content of the medium) on the size and uniformity of the prepared AgNPs have been elucidated in this study. The produced colloidal AgNPs were characterized using UV–vis spectroscopy and transmission electron microscopy (TEM), with the aim of identifying reaction parameters simultaneously achieving optimal particle yield and colloid uniformity. This work illustrates how the versatile nature of DESs can be exploited to create unconventional DESs designed for nanoscale tasks for which conventional (e.g., halide-containing) DESs may be poorly suited, further expanding the repertoire of these solvents as sustainable media for various nanoapplications.

中文翻译:

无卤深共晶溶剂中的微波辅助快速合成银纳米粒子

有机可溶性银纳米颗粒(AgNPs)首次通过一种简单方便的湿化学还原途径在特定任务,无卤化物,深低共熔溶剂(DES)中合成,涉及微波(MW)加热和油胺(OAm)作用作为表面活性剂和还原剂。纳米粒子的形成非常迅速,并且会在100°C的微波加热条件下30秒之内发生。在这项研究中已经阐明了各种反应参数(例如合成温度,MW照射时间,最大MW功率,介质中的水含量)对制备的AgNPs的大小和均匀性的影响。使用紫外可见光谱和透射电子显微镜(TEM)对产生的胶体AgNP进行表征,目的是确定反应参数,同时获得最佳的颗粒收率和胶体均匀性。这项工作说明了如何利用DES的通用性来创建用于纳米级任务的非常规DES,而常规(例如,含卤化物)DES可能不适合该纳米级任务,从而进一步扩展了这些溶剂的种类,成为各种纳米应用的可持续介质。
更新日期:2018-02-27
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