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Updated: Aug 5, 2026
Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Core-shell ZnO/TiO2/Ag nanowires for magnified and long-standing photo-induced enhanced Raman spectroscopy
Mengwei Ma1, Linghui Zhang1, Shuqing Zhang1
1Engineering Research Center of Micro-nano Optoelectronic Materials and Devices, Ministry of Education, Fujian Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, Department of Physics, Xiamen University, Xiamen 361005, China. huangsl@xmu.edu.cn.
Abstract:
Raman spectroscopy is widely applied for substance identification and compositional analysis, while realizing highly sensitive detection of biochemical molecules depends on the spectral enhancement of the substrates. Photo-induced enhanced Raman spectroscopy (PIERS) can significantly enhance the spectral intensity, but the rapid signal decay and short relaxation time limit its wide application. Herein, theoretical analysis and experimental data reveal the synergistic effect of the semiconductor heterojunction nanomaterials in a core-shell structure for the sensitive and stable photoelectric response with spectral enhancement. The ZnO/TiO2/Ag core-shell heterojunction nanowire array with the optimal composition exhibits a PIERS enhancement factor of up to 47 times, approaching the highest reported value to date, and an extraordinarily long relaxation time of over 84 days, which is far superior to those of other material substrates. These unparalleled characteristics provide a reliable, rapid, and convenient technique for the detection of low-concentration biochemical substances.
