复合型金属纳米空心材料的独特壳层构型产生奇特的微观“包裹”效应，使其在超灵敏的光、电、磁、传感及吸附等方面呈现出优异特性。本项目充分发挥物理与化学合成优势，利用脉冲激光在金属离子（HAuCl4, Na2PtCl4）溶液中烧蚀Ag靶材，辐照诱导伽伐尼置换反应，实现可控合成Ag/Au和Ag/Pt纳米空心材料。系统分析Ag/Au和Ag/Pt纳米空心材料的近红外强吸收特性，深入研究合成材料的光催化性能与单分散的纳米空心结构的内在关联。采用电化学系统测试可见光照射下与空心Ag/Au和Ag/Pt纳米光催化剂光电极的循环伏安曲线。分析相关数据，在微观层次上，研究光生电子-空穴的激发、分离、复合及传输在光催化反应中的规律，揭示催化剂性能与结构之间的关系，阐明光催化还原转化 CO2及光催化降解甲基橙、亚甲基蓝等染料分子的机理。本项目研究成果将为后续研究该新型材料的众多优异特性奠定实验和理论基础。

The hybrid metal porous nano-cages with a controllable interior space and a distinctive porous shell have received increasing attention in recent years. The unique objects are characterized as fine nano-particles with lower densities, larger specific surface area, and higher permeability, possessing highly applications in super sensing (light, electron, magnetism) because of their excellent absorption in near-infrared and photo-thermal conversion properties. The properties of the hybrid nano-cages are strongly dependent on their porous surfaces and hollow interiors,. In this project, the hybrid metal nano-cages with hollow interiors will be devised through Galvanic Replacement Reaction (GRR) by pulsed laser ablation of Ag target in metal ion (HAuCl4, Na2PtCl4) solutions. The porous nano-cages with a controllable interior cavity should be synthesized during the replacement reaction between metal nano-particles and activated solution due to photo-thermal heating by pulses laser irradiation. The parameters of laser ablation/irradiation and solute concentration will play critical roles for controlling the replacement reaction degree and rate. Then, UV-Vis-NIR optical absorption spectrum of Ag/Au and Ag/Pt nano-cages will be used to investigate the strong and super wide adsorption of nano-cages in NIR. The profile of the NIR absorption is characterized by the continuous red shift, broadened and intensive spectral lines. The obtained hybrid Ag/Au and Ag/Pt nano-cages with superior improved photo-catalytic activity and excellent stability in photo-catalytic reduction will be investigated in this work. This project provides a new paradigm to obtain hollow like nano-cage directly from bulk materials and inspires deeper investigations for generation more complex structures by this strategy. The relevant physical mechanism obtained from theoretical models and experiments have significant implications for getting an insight into the properties of the porous nano-cages, offering the basis for further development of reliable applications with efficiency and defined purposes.