| Effect of the chemical composition on the work function of gold substrates modified by binary self-assembled monolayers. | |
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MedLine Citation:
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PMID: 21258709 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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This study demonstrated that the work function (Φ) of Au substrates can be fine-tuned by using series ratios of binary self-assembled monolayers (SAMs). By using pure amine- and carboxylic acid-bearing alkanethiol SAM on gold substrates, Φ of Au changed from 5.10 to 5.16 and 5.83, respectively, as determined by ultra-violet photoelectron spectrometry (UPS). The shift in Φ due to the use of different functional groups was rationalized by considering the dipole moments of the molecules anchored on the Au surface. A series of binary SAMs were fabricated by mixing carboxylic acid- and amine-terminated alkanethiols in the deposition solution. By mixing these functional groups in SAMs, a linear correlation between Φ with respect to chemical composition (hence the effective dipole moment on the Au surface) was observed. It was found that arbitrary Φ between extremes (5.16 and 5.83) controlled by respective functional groups can be obtained by changing the chemical composition of SAMs. The Scanning Kelvin Probe (SKP) was also used to measure the contact potential difference (CPD) between SAMs and referencing Au on a patterned substrate prepared by photo-lithography. It was found that the CPD of SAMs with different chemical compositions correlates to their Φ. However, the magnitude of the CPD was smaller than the difference in Φ measured by UPS that was possibly due to the adsorption of contaminants in air. |
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Authors:
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Szu-Hsian Lee; Wei-Chun Lin; Chi-Jen Chang; Chih-Chieh Huang; Chi-Ping Liu; Che-Hung Kuo; Hsun-Yun Chang; Yun-Wen You; Wei-Lun Kao; Guo-Ji Yen; Ding-Yuan Kuo; Yu-Ting Kuo; Meng-Hung Tsai; Jing-Jong Shyue |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-1-24 |
Journal Detail:
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Title: Physical chemistry chemical physics : PCCP Volume: - ISSN: 1463-9084 ISO Abbreviation: - Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-1-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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