Characterization and Application of Self-Assembly Porphyrin with Four “Clips” on Gold Surface

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• 作者：Jiandong Yang ; Minrui Li ; Hongxiang Li ; Yanlian Yang ; Yoshiaki Kashimura ; Chen Wang ; Keiichi Torimitsu ; Xiaoquan Lu ; Wenping Hu
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：July 22, 2010
• 年：2010
• 卷：114
• 期：28
• 页码：12320-12324
• 全文大小：268K
• 年卷期：v.114,no.28(July 22, 2010)
• ISSN：1932-7455

文摘

Self-assembled monolayers (SAMs) of thiol-derivatized porphyrin molecules on Au substrate have attracted extensive interest for use in sensing, molecular recognition, and molecular electronics. Here, we synthesized tetra[p-(3-mercaptopropyloxy)phenyl]porphyrin (PPS₄) with four “clips” for SAMs. The results demonstrated that PPS₄ could form excellent SAMs on gold surface wherein the molecules oriented on substrates with a tilted angle. Self-assembled nanojunctions of PPS₄ were fabricated by using gold nanogap electrodes (gap width: ca. 100 nm), which exhibited nonlinear current−voltage characteristics, indicating tunneling injection of current from Au electrodes into PPS₄. With the light on/off, the nanojunctions switched between low/high impedance states as nanometer scaled photoswitchers.