Length-Dependent Photocatalytic Activity of Hybrid Ag-CdS Nanorods
Length-Dependent Photocatalytic Activity of Hybrid Ag-CdS Nanorods
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DOI：
10.1021/acs.jpcc.2c04396
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
Yongchen Wang;Hawi N. Nyiera;A. W. Mureithi;Yonglei Sun;Tomoyasu Mani;Jing Zhao
中科院分区：
文献类型：
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作者：
Yongchen Wang;Hawi N. Nyiera;A. W. Mureithi;Yonglei Sun;Tomoyasu Mani;Jing Zhao
金属-半导体杂化纳米结构是一种具有广阔应用前景的光催化剂。确定它们的几何形状与催化效率的关系对于催化剂的优化至关重要。在这项工作中，Ag-CdS纳米棒具有五个不同的长度（从25.0到106.5 nm）已合成使用种子介导的生长方法。高分辨率透射电子显微镜（HRTEM）和能量色散X射线光谱（EDS）的研究证实，形成了金属尖端和半导体主体部分，它们在紫外和可见波长范围内吸收强烈而广泛。该纳米棒已被用作光催化剂降解橙子，其催化效率表现出长度依赖性。具体地，在中间长度（72.1nm）的杆中观察到最高效率。随时间变化的光致发光衰减表明，催化效率高的Ag-CdS棒比催化效率低的棒更有可能经历电荷分离-复合途径。了解这些混合结构中的物理过程提供了对微调其几何形状以提高从金属到半导体域的电荷转移效率的见解。因此，可以设计和制造更好的混合纳米材料用于光催化和其他应用。
Hybrid metal–semiconductor nanostructures are promising photocatalysts for a wide span of reactions. Determining the relationship of their geometry with catalytic efficiency is critical for optimization of the catalysts. In this work, Ag-CdS nanorods with five different lengths (from 25.0 to 106.5 nm) have been synthesized using a seed-mediated growth method. High-resolution transmission electron microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDS) studies confirmed that the formation of a metal tip and semiconductor body part and they absorb strongly and broadly in the UV and visible wavelength range. The nanorods have been employed as photocatalysts for methyl orange degradation and their catalytic efficiency exhibited length-dependence. Specifically, the highest efficiency was observed in the rods of intermediate length (72.1 nm). Time-dependent photoluminescence decay revealed that the Ag-CdS rods with high catalytic efficiency have a higher probability to go through charge-separation-recombination pathway than the rods with low catalytic efficiency. Understanding the physical process in these hybrid structures provides insight into fine-tuning their geometry to improve the charge transfer efficiency from the metal to the semiconductor domain. Thus, better hybrid nanomaterials can be designed and fabricated for photocatalytic and other applications.