In recent years, there has been active research on purification of air and decomposition of water using photocatalysts. Oxide semiconductors in particular have the property of being resistant to change, even under punishing use conditions in air, and thus are regarded as a promising photocatalyst material. Among these materials, zinc oxide is attracting attention as an environmentally-friendly material with photocatalytic activity. However, despite the fact that it has a 3.37 eV bandgap, it exhibits photocatalytic action in response to visible light, and its distinctive surface texture and crystallite size are thought to be intimately involved with that effect.
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