Mishra Mrinalini, Huang Yen-Chen, Wang Peng-Hua, Liu Si-Ping, Lee T Randall, Lee Tai-Chou
Department of Chemical and Materials Engineering, National Central University, 300 Jhongda Road, Jhongli City 32001, Taiwan.
Sustainability Science and Engineering Program, International College, Tunghai University, Taichung 40704, Taiwan.
ACS Appl Mater Interfaces. 2021 Jan 27;13(3):4043-4050. doi: 10.1021/acsami.0c20716. Epub 2021 Jan 15.
The coverage, thickness, and crystallinity of ZnInS (ZIS) shells on SiO core nanoparticles (SiO@ZIS) were systematically investigated using microwave-assisted solvothermal methods aided by the addition of acid in ethanolic medium. The surface modification of the SiO cores with (3-mercaptopropyl)trimethoxysilane was found to be critical to generate a homogeneous coverage of ZnInS. The SiO@ZIS core-shell nanoparticles exhibited the best coverage but poor crystallinity when synthesized in pure ethanol, whereas best crystallinity but poor coverage was observed when synthesized in an aqueous solution. The addition of selected amounts of acid (HCl) led to improved crystallinity in the ethanolic medium. The thickness of the ZIS shell could be controlled in an ethanolic solution by judiciously varying the amounts of acid and the concentration of the ZIS precursor. Increasing the concentration of the ZIS precursor to twice the standard concentration in ethanolic solution with the addition of 100 μL of HCl afforded better crystallinity, homogeneous coverage, and optimal photocatalytic hydrogen production.
利用微波辅助溶剂热法，在乙醇介质中添加酸，系统研究了SiO核纳米颗粒（SiO@ZIS）上ZnInS（ZIS）壳的覆盖率、厚度和结晶度。发现用（3-巯基丙基）三甲氧基硅烷对SiO核进行表面改性对于实现ZnInS的均匀覆盖至关重要。当在纯乙醇中合成时，SiO@ZIS核壳纳米颗粒表现出最佳的覆盖率，但结晶度较差；而在水溶液中合成时，则观察到最佳的结晶度，但覆盖率较差。添加选定数量的酸（HCl）可提高乙醇介质中的结晶度。通过明智地改变酸的用量和ZIS前驱体的浓度，可以在乙醇溶液中控制ZIS壳的厚度。在添加100μL HCl的乙醇溶液中，将ZIS前驱体的浓度提高到标准浓度的两倍，可获得更好的结晶度、均匀覆盖率和最佳的光催化产氢性能。
