Sinha Tanur, Ahmaruzzaman M
Department of Chemistry, National Institute of Technology Silchar, Assam 788010, India.
Department of Chemistry, National Institute of Technology Silchar, Assam 788010, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Jun 15;145:280-288. doi: 10.1016/j.saa.2015.03.059. Epub 2015 Mar 9.
Green and facile synthetic methods have gained marvellous fame for the production of polyhedral, anisotropic and spherical gold, and gold-silver bimetallic nanostructures. The useful pivotal characteristics of a green procedure are the usage of environment benign solvent medium, reducing and stabilising agents, and shorter reaction time. We describe here a novel, and greener method for the production of gold and gold-silver core shell nanostructures using aqueous fish scales extract of the Labeo rohita. The effect of various reaction parameters, such as temperature and concentration for the synthesis of the nanostructures were studied. Results indicated that triangular and decahedron gold nanostructures were formed at a lower temperature (40°C) and concentration (10%). While, icosahedral and spherical gold nanostructures were produced at a comparatively higher temperature (100°C) and concentration (40%). The study also revealed that the core-shell bimetallic nanostructures with different morphologies (spherical and oval-shape) were formed at different ratios of chloroaurate and silver nitrate solution. Thus, the present study indicated a simple shape controlled synthesis of gold and gold silver core-shell nanostructures. The synthesised gold nanotriangles were coated over the glass substrate and found to be highly efficient in absorbing infra-red radiations for potential architectural applications. Therefore, the study demonstrated the facile usage of gold nanotriangles for optical coatings. The present strategy depicted the dual functional ability of the fish scale extract as reducing and stabilising agents. This strategy also eliminates the usage of hazardous chemicals, toxic solvents and harsh reducing and stabilizing agents.
绿色且简便的合成方法在制备多面体、各向异性和球形金以及金银双金属纳米结构方面声名远扬。绿色合成方法的关键特性在于使用对环境无害的溶剂介质、还原剂和稳定剂，以及较短的反应时间。我们在此描述一种新颖且更环保的方法，即使用印度野鲮的鱼鳞水提取物来制备金和金银核壳纳米结构。研究了各种反应参数，如温度和浓度对纳米结构合成的影响。结果表明，在较低温度（40°C）和浓度（10%）下形成了三角形和十面体金纳米结构。而在相对较高温度（100°C）和浓度（40%）下产生了二十面体和球形金纳米结构。该研究还表明，在氯金酸盐和硝酸银溶液的不同比例下形成了具有不同形态（球形和椭圆形）的核壳双金属纳米结构。因此，本研究表明了一种简单的形状可控合成金和金银核壳纳米结构的方法。合成的金纳米三角形被涂覆在玻璃基板上，发现其在吸收红外辐射方面具有高效性，可用于潜在的建筑应用。因此，该研究证明了金纳米三角形在光学涂层中的简便应用。本策略展示了鱼鳞提取物作为还原剂和稳定剂的双重功能。该策略还避免了使用有害化学物质、有毒溶剂以及苛刻的还原剂和稳定剂。
