Characterization and Application of Self-Assembly Porphyrin with Four “Clips” on Gold Surface
Author(s):
Jiandong Yang, Minrui Li, Hongxiang Li, Yanlian Yang, Yoshiaki Kashimura, Yoshiaki Kashimura, Keiichi Torimitsu, Xiaoquan Lu, Wenping Hu
Journal:
The Journal of Physical Chemistry C
Year:
2010
Volume:
114
Pages
12320-12324
DOI:
10.1021/jp1020643
Abstract:
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.