Improved Charge Transfer and Hot Spots by Doping and Modulating the Semiconductor Structure: A High Sensitivity and Renewability Surface-Enhanced Raman Spectroscopy Substrate
Improved Charge Transfer and Hot Spots by Doping and Modulating the Semiconductor Structure: A High Sensitivity and Renewability Surface-Enhanced Raman Spectroscopy Substrate
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通过掺杂和调制半导体结构改善电荷转移和热点：高灵敏度和可再生性表面增强拉曼光谱基底
DOI：
10.1021/acs.langmuir.9b00754
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Gao Ming
中科院分区：
文献类型：
--
作者：
Yao Jiacheng;Quan Yingnan;Gao Renxian;Li Jia;Chen Lei;Liu Yang;Lang Jihui;Shen He;Wang Yanyan;Yang Jinghai;Gao Ming
在这里，我们开发了一种新的方法来提高表面增强拉曼光谱（Sers）的活性，使用镁掺杂结合贵金属的ZnO。制备了高度定向的银纳米粒子（AgNPs）修饰在Mg掺杂的ZnO（MZO@Ag）阵列上。以罗丹明6 G为探针分子，MZO@Ag基底具有良好的灵敏度、均匀性和化学稳定性。详细分析了该衬底的增强机理，并采用时域有限差分法（FDTD）模拟了球、棒和杆之间产生间隙的“热点”分布。FDTD仿真计算（E/E0）4为2.5 × 106。此外，所制备的基板可以降解的目标分子在原位照射的可见光照射超过40分钟的过程中，然后有效地恢复通过回收过程的可检测性。我们的基材易于制造、自清洁和可重复使用。它们有望为Sers在生物传感器、生物医学诊断和食品安全领域的应用提供新的机会。
Here, we develop a new method to improve the surface-enhanced Raman spectroscopy (SERS) activity of ZnO using Mg doping combined with noble metals. Highly aligned silver nanoparticles (AgNPs) decorated on an array of Mg-doped ZnO (MZO@Ag) were fabricated. Using rhodamine 6G as the probe molecule, SERS indicated that the MZO@Ag substrate possesses perfect sensitivity, homogeneity, and chemical stability. The enhancement mechanism of this substrate was analyzed in detail, and finite-difference time-domain (FDTD) simulations were used to examine “hot spot” distribution which generated gaps between the balls, the rods, and the stems. FDTD simulation calculated (E/E0)4to be 2.5 × 106. Furthermore, the prepared substrates could degrade the target molecules in situ irradiated by visible light irradiation over the course of 40 min and then efficiently recover detectability through a recycling process. Our substrates were easy to fabricate, self-cleaning, and reusable. They are expected to provide new opportunities for the use of SERS in biological sensors, biomedical diagnostics, and food safety.