Core-shell Au@Ag nanodendrites supported on TiO2 nanowires for blue laser beam-excited SERS-based pH sensing
Core-shell Au@Ag nanodendrites supported on TiO2 nanowires for blue laser beam-excited SERS-based pH sensing
复制标题
TiO2 纳米线上支持的核壳 Au@Ag 纳米枝晶用于蓝色激光束激发的基于 SERS 的 pH 传感
DOI：
10.1364/oe.27.023981
复制
发表时间：
2019-08-19
期刊：
影响因子：
3.8
通讯作者：
Chen, Feng
中科院分区：
文献类型：
--
作者：
Jiao, Anxin;Zhang, Hua;Chen, Feng
与绝大多数通过红色或近红外 (NIR) 激发的研究相比，基于蓝色激光束激发的表面增强拉曼散射 (SERS) 的 pH 传感有望避免对某些特殊温度敏感分子产生不良热效应。在此，我们报告了一种在 TiO2 纳米线上支撑核壳 Au@Ag 纳米枝晶（ND）的巧妙方法，由于通过插入等离子体 Au@Ag 改善了改性 TiO2 载体上的电荷转移效应，该方法在 473 nm 激光激发下具有增强的 SERS 活性。通过使用pH指示剂4-巯基苯甲酸（4-MBA），所获得的TiO2/Au@Ag ND不仅可以在不同溶液（去离子水、NaCl、CaCl2和MgCl2）中对pH值从4.0到9.0范围内的pH变化表现出高灵敏度的线性响应，而且在4℃、25℃和37℃温度下具有优异的温度稳定性以及储存后良好的时间稳定性。 10天。通过使用较短波长激光激发建立的 SERS-pH 传感对于了解温度敏感微环境中的生理过程非常有用。 (C) 2019 年美国光学学会根据 OSA 开放获取出版协议条款
The blue laser beam-excited surface-enhanced Raman scattering (SERS)-based pH sensing holds great promise for avoiding undesired thermal heating effect on some special temperature-vulnerable molecules, as compared to the vast majority studies by exciting in the red or near-infrared (NIR). Herein, we report an ingenious approach to support core-shell Au@Ag nanodendrites (NDs) on TiO2 nanowires, which can possess enhanced SERS activity under 473 nm laser excitation, owing to the improved charge-transfer effect on modified TiO2 support by inserting plasmonic Au@Ag. By using pH-indicating 4-mercaptobenzoic acid (4-MBA), the obtained TiO2/Au@Ag NDs can not only exhibit high sensitive linear-responses of pH changes ranging from pH 4.0 to 9.0 in different solutions (deionized water, NaCl, CaCl2, and MgCl2) but also provide excellent temperature stability under 4 degrees C, 25 degrees C and 37 degrees C temperatures as well as good time stability after storage for 10 days. The established SERS-pH sensing by using shorter wavelength laser excitation is highly desirable for understanding physiological process in temperature-vulnerable microenvironment. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement