Self-Assembly and Photomechanical Switching of an Azobenzene Derivative on GaAs(110): Scanning Tunneling Microscopy Study

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• 作者：Ivan V. Pechenezhskiy ; Jongweon Cho ; Giang D. Nguyen ; Luis Berbil-Bautista ; Brandon L. Giles ; Daniel A. Poulsen ; Jean M. J. Fr茅chet ; Michael F. Crommie
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：January 12, 2012
• 年：2012
• 卷：116
• 期：1
• 页码：1052-1055
• 全文大小：359K
• 年卷期：v.116,no.1(January 12, 2012)
• ISSN：1932-7455

文摘

Self-assembly and light-induced mechanical switching of azobenzene derivatives deposited on GaAs(110) were explored at the single molecule level using scanning tunneling microscopy (STM). 3,3鈥?5,5鈥?Tetra-tert-butylazobenzene (TTB-AB) molecules in the trans isomer configuration were found to form well-ordered islands on GaAs(110). After exposure to ultraviolet (UV) light, the TTB-AB molecules exhibited conformational changes attributed to trans to cis photoisomerization. Photoisomerization of TTB-AB/GaAs is observed to occur preferentially in one-dimensional (1D) stripes. This 1D cascade behavior differs significantly from optically induced switching behavior observed when TTB-AB molecules are placed on a gold surface.