蝶翅构型TiO2/等离子体纳米金复合体系全光谱二氧化碳光还原特性研究

以红珠灰蝶为生物模板,使用原子层沉积法构筑三维构型TiO_2光催化材料以增强其光捕获能力;使用种子生长法制备具有宽幅可见光波段吸收能力的等离子体共振金纳米棱结构,并将其负载于蝶翅构型TiO_2上以得到全光谱响应的复合光催化体系;采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、紫外-可见分光光度计、X射线衍射仪(XRD)等表征了所制备的样品;对样品进行了二氧化碳还原性能测试,结果表明在全光谱照射下,负载有金纳米棱的蝶翅构型TiO_2的二氧化碳光还原性能比无结构的提升了54%。

Butterfly Wing-structural TiO2/Plasmonic Gold Nanocrystals Photocatalytic System for Full-spectrum Carbon Dioxide Photoreduction

This study used Lycaeides argyrognomon Bergstrasser wings as bio-templates to fabricate 3D hierarchical microstructural TiO₂ through atomic layer deposition for the sake of enhancing its light absorption ability. Plasmonic gold nanopyramids with broad-band visible-light absorption ability were fabricated and loaded on the as-prepared TiO₂ in order to obtain composite photocatalytic system responding to full-spectrum sunlight. Scanning electron microscope (SEM), transmission electron microscope (TEM), ultraviolet-visible spectrophotometer, X-ray diffraction (XRD) were used for characterization. The measurement of carbon dioxide photoreduction indicated that with full-spectrum light illumination, the performance of gold nanopyramids-loaded butterfly wing-structural TiO₂ was 54% higher than that of gold nanopyramids-loaded non-structural TiO₂.