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| Preparation of TiN－Ag@Ag Surface-enhanced Raman Spectroscopy Substrate and Its Performance and Enhancement Mechanism for Adenine Detection |
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| DOI： |
| KeyWord:surface-enhanced Raman spectroscopy TiN nano silver adenine |
| Author | Institution |
| AN Xiao-jie，ZHAO Jing，PEI Yuan，WANG Zhi-wu，LIU Yan-kun，LI Bo，WEI Ying-na，WEI Heng-yong，WU Zhen-gang，LI Jing-wu |
1. College of Pharmaceutical Sciences，North China University of Science and Technology，Tangshan ，China; 2. Tangshan People's Hospital，Tangshan ，China; 3. Hebei Key Laboratory of Hazardous Chemicals Safety and Control Technology，North China Institute of Science and Technology， Langfang ，China; 4. College of Material Science and Engineering，North China University of Science and Technology，Tangshan ，China |
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| Abstract: |
| Three composite substrates，TiN@Ag sol，TiN－Ag film and TiN－Ag@Ag sol were prepared for surface-enhanced Raman spectroscopy（SERS） detection of adenine，and the enhancement effect of Raman performance was studied and analyzed．It was found that the peak position of the adenine SERS spectrum was somewhat shifted compared with the theoretical one，where the molecular configuration and dipole moment changed probably when adenine was adsorbed on the enhanced substrate．Meanwhile，the participation of excessive electrons and external solvents in the theoretical calculation might cause peak shift．It was also found that the adenine signal on the TiN－Ag@Ag sol substrate was the strongest since the substrate not only has “hot spots”that can significantly improve the SERS activity due to the resonance coupling between the TiN film and silver nanoparticles，but also has more “hot spots”provided by the Ag nanoparticles on the TiN－Ag@Ag sol substrate aggregated between the Ag nanorods on TiN to form a nano-band gap．Furthermore，TiN－Ag@Ag sol substrate was applied to the sensitive detection of adenine，with a detection limit of 10-5 mol/L．Finally，the enhancement mechanisms for each substrate were analyzed by UV photoelectron spectroscopy combined with Gaussian and FDTD calculations. |
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