Joanna Stępnik, Aneta Kisielewska and Ireneusz Piwoński
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引用次数: 0
摘要
为了更好地理解由半导体二氧化钛(TiO2)和金属纳米结构(MNS)构成的光子晶体(PC)之间的相互作用,我们研究了 PC 结构中发生的慢光子效应(SFE)和 MNS 中发生的电子捕获相结合对模型污染物罗丹明 B(RhB)光催化分解的影响。利用溶胶-凝胶法,在作为模板的聚苯乙烯(PS)微球自组装的支持下,制备了小孔(203 nm)、中孔(316 nm)和大孔(493 nm)的 PC。在紫外光照射下,通过适当离子的光还原作用,在 TiO2 PC 表面生成了银、铂和银铂双金属纳米结构(AgNSs、PtNSs 和 AgPtNSs)。研究发现,增大 PC 的孔径只会轻微改变半导体带隙(BG)的位置,但会特别影响光子带隙(PBG),使其向长波长方向移动。用金属纳米结构修饰 PC 会增加 PBG 的强度。此外,PBG 边缘与半导体 BG 和应用光照范围重叠的现象(称为慢光子效应 (SPE))与单金属和双金属纳米结构修饰 PC 所产生的电子捕获相结合,也会导致 PC 的光催化活性提高。
Preparation and photocatalytic activity of TiO2 photonic crystals modified by bimetallic Ag–Pt nanostructures†
Aiming to achieve a better understanding of the interactions between photonic crystals (PCs) built of semiconductor TiO2 and metallic nanostructures (MNSs), we studied the effect of combining the slow photon effects (SFE) occurring in the PC structure and electron trapping taking place in MNSs on the photocatalytic decomposition of a model pollutant – rhodamine B (RhB). PCs of small (203 nm), medium (316 nm) and large (493 nm) pore size were prepared with the use of the sol–gel method supported by the self-assembly of polystyrene (PS) microspheres that served as a template. Silver, platinum, and bimetallic silver–platinum nanostructures (AgNSs, PtNSs and AgPtNSs) were generated on the surface of TiO2 PCs by photoreduction of appropriate ions under UV illumination. It was found that an increase of the pore size of PCs only changes slightly the position of the semiconductor band gap (BG), while it particularly affects the photonic band gap (PBG), shifting it towards longer wavelengths. The modification of PCs with metallic nanostructures increases the intensity of the PBG. Moreover, the phenomenon of overlapping of the PBG edge with the semiconductor BG and the applied illumination range (known as the slow photon effect (SPE) combined with the electron trapping that is the result of modification of PCs with mono- and bi-metallic nanostructures) leads to an increase in the photocatalytic activity of PCs.
期刊介绍:
A multidisciplinary journal focusing on cutting edge research across all fundamental science and technological aspects of catalysis.
Editor-in-chief: Bert Weckhuysen
Impact factor: 5.0
Time to first decision (peer reviewed only): 31 days