Electrochemical behavior of a series of azobenzene self-assembled monolayers on gold |
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Authors: | Yongqiang Wang Huazhong Yu Shengmin Cai Zhongfan Liu |
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Institution: | (1) Center for Intelligent Materials Research (CIMR), Peking University, 100871 Beijing, China |
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Abstract: | Conclusion This work shows that the structures of Cn AzoC2 (n = 1, 2, 3, 4) SAMs are significantly different and influence the observed electrochemical behavior of these novel azobenzene
systems. The sluggish electron-transfer kinetics of azobenzene SAMs were explained by the alkyl spacer between azobenzene
and electrode, the spatial inhibition for structural change in the redox process of azobenzene, as well as the ion-transportation
barriers. For decrease of the apparent electrontransfer rate constants with increasing the length of end-groups, and the electrochemical
inaccessibility of C4AzoC2 SAMs, the spatial inhibition for structure conformational change and ion-transportation was considered as the predominant
factor. |
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Keywords: | self-assembled monolayers azobenzene electron transfer ion transfer |
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