Supramolecular Self-Assembly and Photo-Induced Transition of a Halogenated Azo-Benzene Molecule on Au(111) Surface

Author:

Ijaz Talha1,Zhang Xin2,Chen Xiaorui3,Xing Xueting1,Fang Simin1,Liu Mengyuan1,Lu Huan4ORCID,Li Fangsen5ORCID,Gao Jianzhi1,Pan Minghu1

Affiliation:

1. School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710119, China

2. School of Physics, Northwest University, Xi’an 710069, China

3. School of Mechanical and Material Engineering, Xi’an University, Xi’an 710065, China

4. School of Geography and Tourism, Shaanxi Normal University, Xi’an 710119, China

5. Vacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123, China

Abstract

Azobenzene derivatives are a unique class of photo-switch molecules with promising potential for nanoscale optical applications. We have studied the self-assembly and photo-induced mechanical switching of azobenzene derivatives on Au(111) at the single-molecule level by using scanning tunneling microscope (STM). 4,4′-Dibromo-azobenzene (Br-AB) molecules are assembled into two types of well-ordered structures on Au(111) surfaces in the trans-isomer configuration. Br-AB molecules experienced configurational changes from trans-to-cis photo-isomerization upon the exposure to the UV light. This photo-isomerization of Br-AB molecules was observed to occur at random sites of ordered structure, evidenced by the appearance of bright protrusions with the height increment. Our results may open up new routes to engineer nanoscale photo-switch molecular devices.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

China Postdoctoral Science Foundation

Support Program for top-notch young talents in Shaanxi Province

Publisher

MDPI AG

Subject

Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering

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