Photocatalytic activity enhancement of TiO_2 nanocrystalline thin film with surface modification of poly-3-hexylthiophene by in situ polymerization
Photocatalytic activity enhancement of TiO_2 nanocrystalline thin film with surface modification of poly-3-hexylthiophene by in situ polymerization
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DOI：
10.1557/jmr.2016.124
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发表时间：
2016-04
影响因子：
2.7
通讯作者：
Jingting Liu;Jingbo Zhang
中科院分区：
文献类型：
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作者：
Jingting Liu;Jingbo Zhang
为了提高TiO2光催化活性，在多孔的TiO2光催化薄膜上原位聚合了3-己基噻吩类单体。将聚-3-己基噻吩(P3HT)均匀修饰在薄膜上。用不同浓度的3-己基噻吩醚溶液控制P3HT的表面修饰量，并通过吸收光谱进行检测。在紫外光照射下的甲基橙溶液中，P3HT的修饰显著提高了催化剂的光催化性能。在210min内，最佳改性量的改性膜对甲基橙的降解率约为80%，比未改性膜提高了一倍。测量了样品的光致发光光谱和开路电压衰减过程，证实了P3HT原位聚合的光催化活性增强机理。P3HT的均相修饰可以促进光生电子-空穴对在TiO2纳米晶薄膜上的分离，从而抑制光生载流子的复合，从而提高其光催化活性。
To improve photocatalytic activity of TiO_2, 3-hexylthiophene monomers were in situ polymerized on porous TiO_2 nanocrystalline thin film. Poly-3-hexylthiophene (P3HT) was homogenously modified on the thin film. The surface modification amounts of P3HT were controlled using different concentrations of 3-hexylthiophene monomer ether solutions and detected by the absorption spectra. The photocatalytic performance tested in methyl orange solution under ultraviolet light irradiation was significantly enhanced due to the modification of P3HT. Within 210 min, approximately 80% of methyl orange was degraded for the modified film with the optimized modification amount, it is twice higher than that of the film without modification. Photoluminescence spectra and open-circuit voltage decay processes of the samples were measured to demonstrate the photocatalytic activity enhancement mechanism due to the in-situ polymerization of P3HT. The homogenous modification of P3HT can promote separation of photogenerated electron–hole pairs on the TiO_2 nanocrystalline thin film, which suppresses the recombination of photogenerated charge carriers, thus improving its photocatalytic activity.