期刊
LANGMUIR
卷 29, 期 34, 页码 10674-10683出版社
AMER CHEMICAL SOC
DOI: 10.1021/la401098x
关键词
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资金
- Robert A. Welch Foundation [E-1320, BQ-0038]
- National Science Foundation [DMR-0906727]
- Texas Center for Superconductivity at the University of Houston
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0906727] Funding Source: National Science Foundation
A series of self-assembled monolayers (SAMs) on gold were generated by the adsorption of n-alkyl xanthic acids (NAXAs) having the general formula CH3(CH2)(n)OCS2H (n = 12-15). The structural features of these SAMs were characterized by optical ellipsometry, contact angle goniometry, polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), and X-ray photoelectron spectroscopy (XPS). This series of xanthate SAMs were compared to SAMs generated from the corresponding n-alkanethiols and aliphatic dithiocarboxylic acids (ADTCAs). The collected data indicate that the NAXAs generate densely packed and well-ordered monolayers. The contact angles of hexadecane on the xanthate monolayers exhibited a large odd-even effect similar to that produced by the ADTCA SAMs. The relative stability of these bidentate xanthate SAMs was evaluated by monitoring the changes in ellipsometric thicknesses and wettability as a function of time under various conditions. The results demonstrate that SAMs formed from NAXAs are much less stable than analogous n-alkanethiolate and ADTCA SAMs.
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