银胶体系中皮考酸的原位变温表面增强拉曼散射研究  

In-Situ Temperature-Dependent Surface Enhanced Raman Scattering of Picolinic Acid in Silver Sol

作　　者：张星[1] 郝艳玲[1,2] 方炎[3] 

机构地区：[1]兴义民族师范学院物理系,兴义562400 [2]南京大学物理学院,南京210093 [3]首都师范大学物理系,北京100037

出　　处：《光散射学报》2013年第3期250-254,共5页The Journal of Light Scattering

基　　金：贵州省教育厅自然科学研究项目(20090099);黔西南州科技局科技计划(2012-2);兴义民族师范学院科研项目(11xyyz04)

摘　　要：研究了温度对皮考酸(2-吡啶羧酸)分子在银胶体系中表面增强拉曼散射(SERS)谱的影响。变温范围在22℃～80℃时,皮考酸吸附在银纳米颗粒表面的SERS谱是可逆的,说明银胶体系在此温度范围内是一种稳定的SERS活性基底。银胶与皮考酸的混合液在持续加热的过程中,SERS谱的整体强度增强,但各谱峰的相对强度变化不大,分析认为在22℃～80℃范围内,皮考酸分子在银纳米颗粒表面的吸附方式基本不变,一直以羧基和N原子上的孤对电子共同作用侧立吸附在银纳米颗粒表面,文中还解释了SERS强度整体增强的原因。The Surface Enhanced Raman Scattering spectra of picolinic acid（2-pyridinecar-boxylic acid） in silver sol have been measured in-situ from 22 ℃ to 80 ℃.The SERS signal is reversible with respect to the temperature change.This result demonstrates that the silver sol is a stable SERS-active substrate.It is found that the SERS intensity increases with increasing temperature,but the relative intensity of each peak is invariant.It is indicated that picolinic acid may keep the adsorbed Pattern perpendicularly with both N-atom of the heteroaromatic ring and carboxylate group with the varying of temperature,and the probable reasons of increased intensity are given.

关 键 词：表面增强拉曼光谱 皮考酸 银纳米颗粒 温度效应 

分 类 号：O657.37[理学—分析化学]