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Issue 14, 2020
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Chemical bath deposition of transparent ZnO films incorporated with erythrosine B molecules and their synergetic electro/photochromic properties

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Abstract

Erythrosine B (EB) dye molecules were embedded in a transparent ZnO semiconductor film, aiming at fabricating an organic/inorganic chromic material. A red-coloured, 3.4 μm thick ZnO film was obtained through a chemical bath deposition method conducted at a low temperature of 90 °C. The EB dye was confirmed to be distributed uniformly inside the ZnO film. Spectroelectrochemical measurement was performed using a three-electrode system with the EB/ZnO film employed as the working electrode. The red colour of the film started to disappear at an applied potential of −0.9 V in a negative scan of cyclic voltammetry. The decolourized film slowly became coloured again at +1.9 V and above in a positive scan. The electrochemically decolourized film was also coloured under fluorescent lighting without applying the potential. Because the EB dye dissolved in water did not show such a reversible colour change, the observed electro/photochromism is attributed to the EB/ZnO hybrid structure where the organic molecules are electronically functionalized by the metal oxide semiconductor.

Graphical abstract: Chemical bath deposition of transparent ZnO films incorporated with erythrosine B molecules and their synergetic electro/photochromic properties

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Article information


Submitted
03 Feb 2020
Accepted
05 Mar 2020
First published
06 Mar 2020

CrystEngComm, 2020,22, 2447-2453
Article type
Paper

Chemical bath deposition of transparent ZnO films incorporated with erythrosine B molecules and their synergetic electro/photochromic properties

R. Yumiyama, D. Hyakutake, M. Hagiwara, E. Hosono, H. Matsuda and S. Fujihara, CrystEngComm, 2020, 22, 2447 DOI: 10.1039/D0CE00167H

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