College of Chemistry, Sichuan University, Chengdu 610064, P. R. China.
Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, P. R. China.
J Phys Chem Lett. 2020 Jul 16;11(14):5777-5784. doi: 10.1021/acs.jpclett.0c01577. Epub 2020 Jul 7.
Hollow gold (Au)-based nanostructures have recently been developed for various applications. However, current nanosynthesis approaches have not yet successfully been implemented for precisely engineering hollow Au-based nanostructures with uniform and well-defined mesoporous shell frameworks. Here, we develop an easy one-pot seedless strategy for fabricating hollow mesoporous AuAg (h-mesoAuAg) nanospheres by combining the galvanic replacement reaction with the surfactant-templated growth. Thiol-terminated multifunctional CHN(CH)-CH-SH (Cl) (CN-SH) as the functional surfactant is the key that facilitates the formation of covalently stable CN-S-Au(I) and CN-S-Ag(I) intermediates. Such intermediates template growth of mesoAuAg shell on initially nucleated Ag-rich seeds through the galvanic replacement reaction. Hierarchically hollow/mesoporous nanostructures and corresponding optical responses of h-mesoAuAg are also precisely engineered by tailoring synthetic parameters. With structural and compositional advantages, h-mesoAuAg nanospheres exhibit promising electrochemical performances toward methanol oxidation reaction and nonenzymatic glucose sensor.
中空金（Au）基纳米结构最近已被开发用于各种应用。然而，目前的纳米合成方法尚未成功地用于精确工程具有均匀和明确定义的介孔壳框架的中空 Au 基纳米结构。在这里，我们通过将电置换反应与表面活性剂模板生长相结合，开发了一种简单的一锅无种子策略，用于制造中空介孔 AuAg（h-mesoAuAg）纳米球。作为功能表面活性剂的末端巯基多功能 CHN（CH）-CH-SH（Cl）（CN-SH）是促进形成共价稳定的 CN-S-Au（I）和 CN-S-Ag（I）中间体的关键。这些中间体通过电置换反应在最初形成的富 Ag 种子上模板生长介孔 AuAg 壳。通过调整合成参数，还精确地设计了 h-mesoAuAg 的分级中空/介孔纳米结构和相应的光学响应。具有结构和组成优势的 h-mesoAuAg 纳米球在甲醇氧化反应和非酶葡萄糖传感器方面表现出有前途的电化学性能。
