Bharti Kanika, Lone Shahbaz Ahmad, Singh Ankita, Nathani Sandip, Roy Partha, Sadhu Kalyan K
Department of Chemistry, Indian Institution of Technology Roorkee, Roorkee, India.
Department of Biotechnology, Indian Institution of Technology Roorkee, Roorkee, India.
Front Chem. 2021 Apr 14;9:639090. doi: 10.3389/fchem.2021.639090. eCollection 2021.
Green synthesis of gold-zinc oxide (Au-ZnO) nanocomposite was successfully attempted under organic solvent-free conditions at room temperature. Prolonged stirring of the reaction mixture introduced crystallinity in the ZnO phase of Au-ZnO nanocomposites. Luminescence properties were observed in these crystalline Au-ZnO nanocomposites due to embedding of gold nanoparticles (AuNP) of 5-6 nm diameter on the surface. This efficient strategy involved the reduction of Au(III) by Zn(0) powder in aqueous medium, where sodium citrate (NaCt) was the stabilizing agent. Reaction time and variation of reagent concentrations were investigated to control the Au:Zn ratio within the nanocomposites. The reaction with the least amount of NaCt for a long duration resulted in Au-ZnO/Zn(OH) nanocomposite. X-ray photoelectron spectroscopy (XPS) confirmed the formation of Zn(OH) and ZnO in the same nanocomposite. These nanocomposites were reconnoitered as bioimaging materials in human cells and applied for visible light-induced photodegradation of rhodamine-B dye.
在室温无有机溶剂条件下成功尝试了金-氧化锌（Au-ZnO）纳米复合材料的绿色合成。反应混合物的长时间搅拌使Au-ZnO纳米复合材料的ZnO相具有结晶性。由于在表面嵌入了直径为5-6纳米的金纳米颗粒（AuNP），在这些结晶的Au-ZnO纳米复合材料中观察到了发光特性。这种有效策略涉及在水性介质中用Zn(0)粉末还原Au(III)，其中柠檬酸钠（NaCt）为稳定剂。研究了反应时间和试剂浓度的变化，以控制纳米复合材料中的Au:Zn比例。长时间使用最少NaCt量的反应生成了Au-ZnO/Zn(OH)纳米复合材料。X射线光电子能谱（XPS）证实了同一纳米复合材料中Zn(OH)和ZnO的形成。这些纳米复合材料被用作人类细胞中的生物成像材料，并应用于可见光诱导的罗丹明-B染料光降解。
