罗丹明6G
拉曼光谱
材料科学
无定形固体
二氧化钛
基质(水族馆)
表面增强拉曼光谱
纳米片
金红石
纳米颗粒
孔雀绿
钛
光催化
化学工程
检出限
银纳米粒子
光谱学
分析化学(期刊)
纳米技术
分子
拉曼散射
化学
吸附
光学
催化作用
物理化学
结晶学
有机化学
复合材料
色谱法
冶金
海洋学
量子力学
物理
工程类
地质学
作者
Lan Zhang,Shiying Wu,Tingting Zhang,Anqi Li,Gongying Wang,Lingling Wang,Chang Liu,Weihua Li,Jiansheng Li,Rui Lü
标识
DOI:10.1177/00037028231213099
摘要
For the purpose of investigating the chemical enhancement of amorphous semiconductors as well as increasing the sensitivity of the surface-enhanced Raman spectroscopy (SERS) substrate, titanium dioxide (TiO 2 ) precursors were calcined at different temperatures to generate crystallized TiO 2 (c-TiO 2 ) and amorphous TiO 2 (a-TiO 2 ) nanosheets, respectively. Afterward, a two-dimensional (2D) a-TiO 2 /Ag nanosheet SERS substrate was successfully fabricated using electrostatic interaction between a-TiO 2 and Ag nanoparticles. In order to demonstrate a greater SERS sensitivity on a-TiO 2 /Ag compared to either c-TiO 2 or Ag nanoparticles alone, the SERS probe molecules rhodamine 6G (R6G) and malachite green (MG) were utilized. Based on the results of SERS detections for probe molecules and contaminants, it demonstrates that a-TiO 2 /Ag nanosheets produce highly sensitive and repeatable Raman signals. The detectable concentration limits for R6G and MG were found to be 10 −11 M and 10 –10 M, respectively. And it has been determined that the system exhibits an enhancement factor (EF) of up to 1 × 10 8 . The limit of detection for 4-mercaptobenzoic acid and alizarin red can both reach 1 × 10 –8 . Furthermore, a finite-difference time-domain simulation is performed in order to evaluate the magnetic field strength generated by Ag nanoparticles. As a result of the simulation, it is evident that the actual EF is smaller than the calculated one, leading support to the view that a-TiO 2 nanosheets have a beneficial effect on the chemical enhancement of SERS.
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