Tunneling Characteristics of Octadecyl Derivatives on Tin and Indium Electrodes
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- 作者：Yuhong Liu ; Xiaolin Fan ; Deliang Yang ; Chen Wang ; Lijun Wan ; and Chunli Bai
- 刊名：Langmuir
- 出版年：2004
- 出版时间：February 3, 2004
- 年：2004
- 卷：20
- 期：3
- 页码：855 - 861
- 全文大小：268K
- 年卷期：v.20,no.3(February 3, 2004)
- ISSN：1520-5827
文摘
In this paper we report the tunneling behavior based on the capillary tunnel junctions of n-octadecylmercaptan (C18H37SH), octadecylamine (C18H37NH2), nonadecanoic acid (C17H35COOH), octadecanol (C18H37OH), and n-iodooctadecane (C18H37I), sandwiched between tin and indium electrodes utilizingthe naturally existing oxide surfaces, respectively. The surfaces of the electrodes were examined by X-raydiffraction (XRD), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) methods,and the self-assembled monolayers adsorbed on the electrode surfaces were inspected by contact anglemeasurements and XPS. The measured characteristic curves on tin electrode indicated a sequence ofenergy gaps associated with the specimen: 
C17H35COOH > C18H37OH > C18H37SH > C18H37NH2> C18H37I. The results on the energy gaps obtained on indium electrodes displayed similar sequencebehavior although with different gap values. The experimental observations indicate that the molecule-electrode contact, including both the functional groups and substrates, could contribute jointly to theoverall conductance characteristics of molecular junctions.
C17H35COOH > C18H37OH > C18H37SH > C18H37NH2> C18H37I. The results on the energy gaps obtained on indium electrodes displayed similar sequencebehavior although with different gap values. The experimental observations indicate that the molecule-electrode contact, including both the functional groups and substrates, could contribute jointly to theoverall conductance characteristics of molecular junctions.