Enhanced Photocurrent Generation of Binary Self-Assembled Monolayers of Di-(3-aminopropyl)-Viologen and Methylviologen on Indium Tin Oxide

Title
Enhanced Photocurrent Generation of Binary Self-Assembled Monolayers of Di-(3-aminopropyl)-Viologen and Methylviologen on Indium Tin Oxide
Authors
이미선형경희이원주안희준조병원노재근한성환
Keywords
Self-Assembled Monolayers; Photocurrent; Cyclic Voltammetry; Viologen; Photoinduced Charge-Transfer
Issue Date
2011-05
Publisher
Journal of nanoscience and nanotechnology
Citation
VOL 11, NO 5, 4389-4393
Abstract
The binary self-assembled monolayers (SAMs) of di-(3-aminopropyl)-viologen (DAPV) and methylviologen (MV) molecules on indium tin oxide (ITO) were prepared by dipping the DAPV SAMs/ITO substrates into MV solution. The DAPV-MV SAM films were characterized by UV-vis. absorption spectroscopy, Rutherford backscattering spectroscopy, and cyclic voltammetry. Optical band gap, lowest unoccupied molecular orbital, and highest occupied molecular orbital of DAPV-MV SAMs were measured to be 1.6, −4.3, and −5.9 eV, respectively. We found that although DAPV SAMs have a quantum yield of 0.11%, the binary SAM films have a good quantum yield of 2.30%, which was 20 times higher than that of DAPV SAMs on ITO. This result may be due to the higher adsorption property of the binary SAMs for the light in visible range compared to that of DAPV SAMs. From this study, we demonstrated that the photocurrent generation systems with a high quantum yield can be obtained by the functional binary SAMs.
URI
http://pubs.kist.re.kr/handle/201004/45621
ISSN
1533-4880
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