Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Kofu, Yamanashi, Japan.
Langmuir. 2013 Apr 16;29(15):4908-14. doi: 10.1021/la400556t. Epub 2013 Apr 5.
We synthesized a three-layer-type photocatalytic structure (TiO2/Cu(II)SiO2/SiO2), consisting of TiO2 on Cu(II)-grafted SiO2, which was deposited on a SiO2-coated glass substrate, and investigated its visible-light absorption and hydrophilic properties. Water contact angle measurements revealed visible-light-induced superhydrophilicity at the film surface that was initiated by interfacial electron transfer (IFET) at the interface of TiO2 and Cu(II)SiO2. Monitoring the oxidation state of Pb(2+) ions confirmed that the IFET-initiated holes diffused to the TiO2 surface, where they likely contributed to the hydrophilic conversion. We also demonstrated that layer-structured TiO2/Cu(II)SiO2/SiO2 was stable under alkaline conditions. Thus, we successfully synthesized alkaline-resistant TiO2 that displays visible-light-induced superhydrophilicity.
我们合成了一种三层型光催化结构（TiO2/Cu(II)SiO2/SiO2），由负载在 SiO2 上的 TiO2 和 Cu(II)SiO2 组成，并研究了其可见光吸收和润湿性。水接触角测量表明，薄膜表面在可见光照射下具有超亲水性，这是由 TiO2 和 Cu(II)SiO2 界面的界面电子转移（IFET）引发的。监测 Pb(2+)离子的氧化态证实，IFET 引发的空穴扩散到 TiO2 表面，可能有助于亲水转化。我们还证明了层状 TiO2/Cu(II)SiO2/SiO2 在碱性条件下稳定。因此，我们成功合成了在碱性条件下具有可见光诱导超亲水性的耐碱 TiO2。
