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Effect of CTAB on the Surface-Enhanced Raman Scattering of Tetrakis(4-N-methylpyridyl)porphyrin
Liu Xia,Chen Dongming*,He Tianjing,Liu Fanchen
Author NameAffiliationE-mail
Liu Xia Department of Chemical Physics, The University of Science and Technology of China, Hefei 230026  
Chen Dongming* Department of Chemical Physics, The University of Science and Technology of China, Hefei 230026 dmchen@ustc.edu.cn 
He Tianjing Department of Chemical Physics, The University of Science and Technology of China, Hefei 230026  
Liu Fanchen Department of Chemical Physics, The University of Science and Technology of China, Hefei 230026  
Abstract:
Surfactants have significant effects on the properties of liquid-solid surfaces. The effects of surfactants on the surface-enhanced Raman scattering (SERS) of molecules adsorbed on solid substrates have been used to improve the qualities of SERS spectra and to reveal the distance-enhancement relationship of SERS. On the other hand, the adsorption behaviors of porphyrin compounds on surfaces are important for their applications in electrode modification, sensitization of photo-electric transduers and biomimetic catalysis. The effect of cetyltrimethyl ammoniumbromide (CTAB) on the SERS of free-base 5,10,15,20-tetrakis(4-N-methylpyridyl)porphyrin (H2TMPyP) and its Ag-chelate (AgTMPyP) adsorbed on Ag colloid was studied. It was found from the SERS spectra that the adsorbed H2TMPyP molecules undergo silver-incorporation to form AgTMPyP which can change back toH2TMPyPwhen added CTAB. The similar demetallization reaction was aslo observed in AgTMPyP/Ag sol/CTAB systems. The SERS signals were found to be obviously enhanced when added CTAB. The implications of the findings in relation to the change ofmicro-environmenton Ag particles by the addition of CTAB are briefly discussed.
Key words:  Porphyrin, Surface-Enhanced Raman Scattering (SERS), Surfactant
FundProject:国家自然科学基金(20173051,29873043)和安徽省自然科学基金(01046302)资助项目.
CTAB对四-(4-N-甲基吡啶)卟啉SERS谱的影响
刘霞,陈东明*,何天敬,刘凡镇
摘要:
研究了阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)对四-(4-N-甲基吡啶)卟啉(H2TMPyP)及其银配合物(AgTMPyP)在Ag胶中的表面增强拉曼散射(SERS)谱的影响.SERS光谱表明,吸附于Ag胶粒的H2TMPyP与衬底银原子结合形成AgTMPyP,加入CTAB后,部分AgTMPyP表面络合物还原为H2TMPyP.相似的去金属化反应也出现在AgTMPyP/Ag胶/CTAB体系中.CTAB的加入使SERS谱带强度明显增加.AgTMPyP的去金属化被认为是由于CTAB的存在使Ag胶颗粒表面附近
关键词:  表面增强拉曼散射  卟啉  表面活性剂
DOI:10.1088/1674-0068/16/3/176-180
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