RT info:eu-repo/semantics/article
T1 Unraveling the mechanism of photo-induced surface enhanced Raman scattering on ZnO/Au thin films
A1 Tran, Van Tan
A1 Le, Minh Phuong
A1 Pham, Nguyen Hai
A1 Le, Thi Hai Yen
A1 Nguyen, Viet Tuyen
A1 Pham, Thi Hong
A1 Nguyen, Tan San
A1 Nguyen, Quang Hoa
A1 Pham, Van Thanh
A1 Nguyen, Trong Tam
A1 Nguyen, Cong Toan
A1 Ngac, An Bang
A1 Martínez Sacristán, Oscar
A1 Tran, Thi Ha
K1 ZnO thin films; Au nanoparticles; sputtering; surface enhanced Raman scattering (SERS); Photo induced enhanced Raman scattering (PIERS); UV excitation
AB Surface-enhanced Raman scattering (SERS) is a powerful technique for detecting pollutants. Recent studies have shown that the sensitivity of SERS can be further improved by using appropriate light excitation before or during Raman measurements, a phenomenon known as photo-induced enhanced Raman scattering (PIERS). In this study, we developed a highly sensitive SERS substrate by fabricating a ZnO/Au thin film using radio frequency magnetron sputtering and post-annealing processes. The resulting substrate exhibited high crystallinity and high sensitivity for pollutant detection. The study found that in situ UV excitation significantly enhanced the Raman signal, up to 5.5 times more efficiently than the traditional SERS technique. The excitation process was reversible, leading to a quick recovery of the Raman intensity to its initial level when the UV excitation was turned off. This relaxation process is attributed to the recombination of electrons and holes. The investigation shows that ZnO/Au thin films was able to detect fungicide thiram with a limit of detection of 10 8 M. PIER also helps to lower the detection threshold down to 10 9 M.
PB Elsevier
SN 0169-4332
YR 2024
FD 2024
LK https://uvadoc.uva.es/handle/10324/81870
UL https://uvadoc.uva.es/handle/10324/81870
LA eng
NO Applied Surface Science 657 (2023) 159785
NO Producción Científica
DS UVaDOC
RD 20-ene-2026