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双缺陷协同作用的Cr_xTi_yO₂纳米结构可以提高高SERS性能

Yurui Jiang^1,2, Junyang Ren², Xiaobin Yao^3,4

¹Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China.

The journal of physical chemistry letters

|November 10, 2025

概括

具有双重缺陷的工程半导体基板,特别是Cr_xTi_yO₂中的Ti空缺和Cr兴奋剂,显著提高了表面增强的拉曼光谱 (SERS) 对于化学检测的灵敏度.

科学领域:

材料科学材料科学材料科学
频谱学是一种光谱学.
纳米技术纳米技术

背景情况:

基于半导体的表面增强拉曼光谱 (SERS) 基板正在成为基于贵金属的替代品.
缺陷工程,包括空缺创建和元素兴奋剂,是优化半导体SERS性能的关键.
多种缺陷类型对SERS增强的协同效应仍然不太清楚.

研究的目的:

研究纳米结构Cr_xTi_yO₂中Ti空缺和Cr兴奋剂的协同效应,以提高SERS.
为了阐明双重缺陷改善SERS信号放大机制.
开发一种用于设计高性能半导体SERS基板的新途径.

主要方法:

制造纳米结构的Cr_xTi_yO₂,使用受控的Ti空缺和Cr兴奋剂.
双缺陷协同增强SERS基质的表征.
使用开发的基质检测甲蓝 (MB) 和4-墨本酸 (4-MBA).
密度函数理论 (DFT) 计算以确认电子结构的修改.

主要成果:

最佳的Cr_x3Ti_yO₂基底表现出高灵敏度,检测到10-11M的MB和10-8M的4-MBA.
基板表现出极好的可重复性和稳定性.
DFT的计算证实,双重缺陷优化了带结构,增强了载波分离,促进了电荷传输.

结论:

在Cr_xTi_yO₂中的双缺陷工程通过优化电子特性和电荷转移来协同增强SERS性能.
这项工作通过多缺陷协同作用为设计基于半导体的先进SERS基板提供了新的策略.
这些发现有助于开发灵敏可靠的化学检测平台.

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