Free patterns of graded multicolour images have been formed using ZnO films, prepared by ultrasonic spray pyrolysis, by illuminating the semiconducting films with UV light; an external bias to the ZnO electrode is not necessarily required.
Y. Harima, Y. Wang, K. Matsumoto and K. Yamashita, J. Chem. Soc., Chem. Commun., 1994, 2553 DOI: 10.1039/C39940002553
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