Molecularly controlled modulation of conductance on azobenzene monolayer-modified silicon surfaces

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	Molecularly controlled modulation of conductance on azobenzene monolayer-modified silicon surfaces
	Zhang, XY ; Wen, YQ ; Li, YF ; Li, G ; Du, SX ; Guo, HM ; Yang, LM ; Jiang, L ; Gao, HJ ; Song, Y
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2008
卷号	112 期号:22 页码:8288
关键词	SELF-ASSEMBLED MONOLAYERS POROUS SILICON ORGANIC MONOLAYERS ALKYL MONOLAYERS ELECTRONIC-STRUCTURE DEVICES PHOTOISOMERIZATION ACTIVATION BEHAVIOR DOMAINS
ISSN号	1932-7447
通讯作者	Wen, YQ: Chinese Acad Sci, Key Lab Organ Solids, New Mat Lab, Inst Chem, Beijing 100080, Peoples R China.
中文摘要	Controlled modulation of silicon surface properties is of great importance for the development of silicon-based molecular electronic devices because of the ubiquitous role of silicon in microelectronics. In this article, photoresponsive azobenzene molecules were covalently grafted onto hydrogen-terminated Si(111) surfaces via Si-C linkages. These direct Si-C bond linkages are preferred over Si-O linkages at the interfaces because of the higher stability and the better electronic continuation between Si and the alkyl chain. The modified surfaces were characterized by X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. The reversible photoisomerization effects of the azobenzene molecules were also studied with contact angle measurements, atomic force microscopy (AFM), and conductive atomic force microscopy (C-AFM). The measured conductivity showed a reversible switching behavior by alternate illumination with UV and visible light. Thus, we have demonstrated molecularly controlled modulation of conductance of the Si surface by the photochemical method. Furthermore, the dipole moments of the azobenzene molecules switched accordingly with the alternate illumination. Making use of this characteristic, we have provided a strategy to evaluate the influence of the molecular dipole moments on the conductance of the semiconductor surface.
收录类别	SCI
语种	英语
公开日期	2013-09-18
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/42270]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhang, XY,Wen, YQ,Li, YF,et al. Molecularly controlled modulation of conductance on azobenzene monolayer-modified silicon surfaces[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2008,112(22):8288.
APA	Zhang, XY.,Wen, YQ.,Li, YF.,Li, G.,Du, SX.,...&Song, Y.(2008).Molecularly controlled modulation of conductance on azobenzene monolayer-modified silicon surfaces.JOURNAL OF PHYSICAL CHEMISTRY C,112(22),8288.
MLA	Zhang, XY,et al."Molecularly controlled modulation of conductance on azobenzene monolayer-modified silicon surfaces".JOURNAL OF PHYSICAL CHEMISTRY C 112.22(2008):8288.