含不同链长的三个卟啉LB膜修饰电极的光电响应研究  

Study on Photocurrent Generation of Three Porphyrin Monolayer Modified Electrodes with Various Side Chain Lengths

作　　者：李富友[1] 余军华[2] 张宝文[2] 黄春辉[1] 

机构地区：[1]复旦大学先进材料实验室,上海200433 [2]中国科学院理化技术研究所,北京100101

出　　处：《化学学报》2006年第4期301-305,共5页Acta Chimica Sinica

基　　金：科技部863项目(No2002AA302403);国家自然科学基金(Nos20490210;20441006);上海市科委(Nos03QB14006;03DZ12031)资助项目

摘　　要：利用LB(Langmuir-Blodgett)技术将含不同链长的卟啉化合物(C4Py,C6Py和C8Py)单层膜转移到ITO(indium-tinoxide)导电玻璃上,发现其具有良好的光电转换性质.卟啉化合物修饰后的紫外吸收光谱与光电流工作谱重叠,表明卟啉化合物起到了敏化光电流产生的效果;而且电子给体、电子受体和偏压对其敏化效果的实验结果表明:光诱导电子转移是产生光电响应的主要原因.而且,这三个卟啉化合物的光电响应性质与碳链长度相关,其中含有六个碳链的C6Py表现出最佳的光电转化效果.Three porphyrin derivative monolayers （C4Py, C6Py and C8Py） terminated with different chain lengths were successfully deposited on indium-tin oxide （ITO） electrodes using Langmuir-Blodgett （LB） technique, and the sensitized ITO electrodes exhibited high photocurrent values under ambient conditions. Action spectra of the photocurrent generation were coincident with the UV-Vis absorption spectra of these porphyrin LB monolayer modified electrodes, indicating that these porphyrin derivatives were responsible for photocurrent generation. The observed photocurrent strongly depended on the electron donor, electron acceptor and bias voltage, suggesting that photoinduced electron transfer should be a main mechanism of light sensitization for the photocurrent generation. The photocurrents were varied with the side chain length, and the compound C6Py with a longer chain exhibited the maximum photocurrent.

关 键 词：卟啉化合物 LB膜 光电响应 

分 类 号：O646.5[理学—物理化学]