Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 16, Pages 14736-14743Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5043627
Keywords
polythiophene film; wettability transition; superhydrophobicity; superhydrophilicity; surface chemistry
Funding
- National Science Foundation of China [21374060, 51173103]
- 973 Projects [2012CB933803, 2014CB643605]
- National Science Fund for Distinguished Young Scholars [50925310]
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An electro-responsively reversible switching of wettability between superhydrophobicity and superhydrophilicity has been obtained from a highly porous structured polythiophene film. The polythiophene film was prepared by two-step electrochemical deposition on an indium tin oxide (ITO) substrate. The underlying poly(3,4-ethylenedioxythiophene) (PEDOT) provides a highly porous structured conductive support, and poly(3-methylthiophene) (P(3-MTH)) deposited thereon plays the role of a low-surface-energy conductive coating. The wettability switching of this double-layer film between superhydrophobicity and superhydrophilicity has been investigated by doping and dedoping in an electrolyte solution containing ClO4-. Electrochromism of the film was also seen to accompany the electrochemical process of conversion between the two superwetting states. On the basis of this porous electro-active film, an in situ electro-wetting device was also demonstrated.
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