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TiN-Ag@Ag SERS基底制备及其对腺嘌呤的检测性能与增强机制研究
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安晓洁,赵静,裴媛,王志武,刘艳坤,李波,魏颖娜,魏恒勇,吴振刚,李景武 1. 华北理工大学 药学院河北 唐山 063210 2. 唐山市人民医院河北 唐山 063001 3. 华北科技学院 河北危险化学品安全与控制技术重点实验室河北 廊坊 065201 4. 华北理工大学 材料科学与工程学院河北 唐山 063210 
基金项目:河北省自然科学基金(E2019209474,H2022209066);河北省危险化学品安全与控制技术重点实验室开放课题(20211204-5);河北省教育厅科学技术研究项目(ZD2021332);河北省引智项目(拉曼光谱应用于内镜和肿瘤诊断技术的研发);河北省省属高校基本科研业务费项目(JQN2022015)
中文摘要:该文制备了TiN@Ag溶胶、TiN-Ag薄膜、TiN-Ag@Ag溶胶3种复合基底对腺嘌呤进行表面增强拉曼光谱(SERS)检测,并对拉曼增强效应进行研究。结果显示,与理论峰位相比,腺嘌呤的SERS图峰位发生偏移,可能是腺嘌呤吸附在增强基底上时分子构型和偶极距发生了改变(理论计算中过多的电子和外部溶剂的参与也会引起峰位偏移)。研究发现TiN-Ag@Ag溶胶基底上腺嘌呤的信号最强,这是因为该基底不仅具有TiN薄膜与Ag纳米颗粒发生共振耦合出现的可使SERS活性明显提高的“热点”,还存在Ag纳米颗粒聚集在Ag纳米棒之间形成的纳米间隙产生的更多“热点”。利用TiN-Ag@Ag溶胶基底对腺嘌呤进行灵敏检测,检出限可达10-5 mol/L。并通过紫外光电子能谱结合高斯软件中密度泛函理论和时域有限分差法,对各基底的增强机制进行了分析。
中文关键词:表面增强拉曼光谱  氮化钛  纳米银  腺嘌呤
 
Preparation of TiN-Ag@Ag Surface-enhanced Raman Spectroscopy Substrate and Its Performance and Enhancement Mechanism for Adenine Detection
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.
Key Words:surface-enhanced Raman spectroscopy  TiN  nano silver  adenine
引用本文:安晓洁,赵静,裴媛,王志武,刘艳坤,李波,魏颖娜,魏恒勇,吴振刚,李景武.TiN-Ag@Ag SERS基底制备及其对腺嘌呤的检测性能与增强机制研究[J].分析测试学报,2023,(1):21-28.
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