期刊
APPLIED PHYSICS LETTERS
卷 109, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4961116
关键词
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资金
- 973 Program [2013CB932903]
- NSFC [61475035, 61275054]
- Innovation Project of Jiangsu Province Fundamental Research Funds for the Central Universities [KYLX15_0161]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1565]
Dopamine (DA) is a potential neuro modulator in the brain which influences a variety of motivated behaviors and plays a key role in life science. A hybrid ZnO/Ag microcavity based on Whispering Gallery Mode (WGM) effect has been developed for ultrasensitive detection of dopamine. Utilizing this effect of structural cavity mode, a Raman signal of R6G (5 x 10(-3) M) detected by this designed surface-enhanced Raman spectroscopy (SERS)-active substrate was enhanced more than 10-fold compared with that of ZnO film/Ag substrate. Also, this hybrid microcavity substrate manifests high SERS sensitivity to rhodamine 6G and detection limit as low as 10(-12) M to DA. The Localized Surface Plasmons of Ag nanoparticles and WGM-enhanced light-matter interaction mainly contribute to the high SERS sensitivity and help to achieve a lower detection limit. This designed SERS-active substrate based on the WGM effect has the potential for detecting neurotransmitters in life science. Published by AIP Publishing.
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