四炔聯苯基苯之單層膜結構與其穿隧能譜：炔基與聯苯之旋轉對分子自組裝的影響

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四炔聯苯基苯之單層膜結構與其穿隧能譜：炔基與聯苯之旋轉對分子自組裝的影響

The Effect of Rotatable Ethynyls on the Monolayer Structure of a Biaxial Biphenyl(ethynyl)benzene: an STM/STS Study

吳弘仁 , Masters　　Advisor：陳俊顯　　

繁體中文

掃描穿隧顯微術；掃描穿隧能譜；平躺位向；立起位向；電荷轉移；奈米導線； Scanning Tunneling Microscopy ； Scanning Tunneling Spectroscopy ； HOPG ； TBPB ； Face-on ； Edge-on ； Charge Transfer

Abstract │ Reference (98) │ Altmetrics

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This thesis reports the electronic communications between edge-on biphenyl moieties of biaxial TBPB (1,2,4,5-tetrakis-(4-dodecyl-4'- ethynyl-biphenyl)-benzene) by using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). Assemblies were realized by taking the advantages of the rotatable ethynyl linkers of the TBPB. Rotatable ethynyl linkers allowed the biphenyl moieties of the TBPB to adopt both face-on and edge-on orientations. We compared the difference of arrangements and electronic properties of TBPB under two concentrations, 0.32 mM and 3.2 microM. Topographic images revealed two kinds of concentrations, 0.32 mM and 3.2 microM., respectively, linear and mesh. Linear motif showed face-on and edge-on orientations because of different heights between biphenyls of TBPB in section profiles. Mesh motif showed only face-on orientation because of the same height of biphenyls of TBPB in section profiles. I–V curves of both motifs are asymmetric with respect to current at zero bias. The asymmetric feature was more significant for the linear motif than the mesh one, resulting in a larger tunneling current and a smaller turn-on voltage for the former. Linear motif were more conductive since edge-on orientations produce an effective electronic coupling between π-stacked biphenyls. Thereby, edge-on biphenyl moieties of biaxial molecule TBPB is the key to the successful assembly of conjugated 1D nanowires.

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連結：
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(7) Shirota, Y.; Kageyama, H. Charge Carrier Transporting Molecular Materials and Their Applications in Devices. Chem. Rev. 2007, 107, 953-1010.
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