Article, 2018

Diamine anchored molecular junctions of oligo(phenylene ethynylene) cruciform

Chinese Chemical Letters, ISSN 1878-5964, 1001-8417, Volume 29, 2, Pages 271-275, 10.1016/j.cclet.2017.08.034

Contributors

Liu, Yuqing [1] [2] [3] [4] Santella, Marco 0000-0002-0659-5936 [3] Fan, Zhi-Qiang 0000-0001-8565-5919 [4] Wang, Xintai 0000-0002-6151-414X [3] Jiang, Xiang-Wei [4] Nielsen, Mogens Brøndsted 0000-0001-8377-0788 [3] Nørgaard, Kasper 0000-0002-7784-7985 [3] Laursen, Bo Wegge 0000-0002-1120-3191 [3] Li, Jingbo 0000-0002-6130-7538 [4] Wei, Zhongming 0000-0002-6237-0993 (Corresponding author) [2] [4]

Affiliations

  1. [1] Sino-Danish Centre for Education and Research
    2. [NORA names: China; Asia, East];
  2. [2] University of Chinese Academy of Sciences
    3. [NORA names: China; Asia, East];
  3. [3] University of Copenhagen
    4. [NORA names: KU University of Copenhagen; University; Denmark; Europe, EU; Nordic; OECD];
  4. [4] Institute of Semiconductors
    5. [NORA names: China; Asia, East]

Abstract

Using diamine as anchoring group, the self-assembled monolayers (SAMs) based on oligo(phenylene-ethynylene)s (OPEs) and cruciform OPEs with an extended tetrathiafulvalene (TTF) (OPE3 and OPE3-TTF) were successfully formed on the Au substrate. The uniformity and stability of SAMs were confirmed through cyclic voltammetry (CV) and electrochemical reductive desorption. The investigation of transport properties of SAMs was achieved by conducting-probe atomic force microscopy (CP-AFM) with both Au and Pt tips. The results indicated that the conductance of OPE3-TTF was 17 and 46 times that of OPE3 for Au and Pt tips, respectively. Theoretical calculations are qualitatively consistent with the experimental results, suggesting that the diamine as anchoring group has a great potential in molecular electronics.

Keywords

Au, Au substrate, CP-AFM, OPE, OPE3, Pt tip, anchor, anchoring groups, atomic force microscopy, calculations, conducting-probe atomic force microscopy, conductivity, cruciform, cyclic voltammetry, desorption, diamine, electrochemical reductive desorption, electron, ethynylene, experimental results, extended tetrathiafulvalene, force microscopy, group, investigation, microscopy, molecular electronics, molecular junctions, monolayer, oligo(phenylene ethynylene, potential, properties of self-assembled monolayers, reductive desorption, results, self-assembled monolayers, stability, stability of self-assembled monolayers, substrate, tetrathiafulvalene, theoretical calculations, tip, uniformity, voltammetry

Funders

  • National Natural Science Foundation of China
  • Ministry of Science and Technology of the People's Republic of China
  • Chinese Academy of Sciences

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