具有由热处理缺陷诱导的可调表面等离子体共振的表面增强拉曼散射活性WO薄膜。

SERS-active WO thin films with tunable surface plasmon resonance induced by defects from thermal treatment.

作者信息

Shi Yuze, Liu Qingyou, Hong Ruijin, Tao Chunxian, Wang Qi, Lin Hui, Han Zhaoxia, Zhang Dawei

机构信息

Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No.516 Jungong Road, Shanghai 200093, China.

Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2022 Mar 5;268:120686. doi: 10.1016/j.saa.2021.120686. Epub 2021 Dec 1.

DOI:10.1016/j.saa.2021.120686

PMID:34890874

Abstract

A series of WO thin films with defects were obtained by thermal treatments from laser irradiation and annealing, respectively. The corresponding tunability of localized surface plasmon resonance properties and the enhancement of Raman scattering intensity were realized due to the defects in the WO thin films after thermal treatments. With the changes of either laser power or annealing temperature, the crystalline quality of WO thin film was declined with a red shift of the surface plasmon resonance wavelength from 464 nm to 482 nm. The as-treated WO film shows good uniformity and reproducibility in Surface-enhanced Raman spectroscopy measurement, the detection limit for dye methylene blue can reach 10 mol/L, and enhancement factor is 1.38 × 10. Furthermore, the simulation result of finite-difference time-domain showed a substantial agreement with experimental results.

摘要

分别通过激光辐照热处理和退火处理获得了一系列具有缺陷的WO薄膜。由于热处理后WO薄膜中的缺陷，实现了局部表面等离子体共振特性的相应可调性以及拉曼散射强度的增强。随着激光功率或退火温度的变化，WO薄膜的晶体质量下降，表面等离子体共振波长从464nm红移至482nm。处理后的WO薄膜在表面增强拉曼光谱测量中表现出良好的均匀性和可重复性，对染料亚甲基蓝的检测限可达10mol/L，增强因子为1.38×10。此外，时域有限差分模拟结果与实验结果基本一致。