Controllable assembly of well-defined monodisperse Au nanoparticles on hierarchical ZnO microspheres for enhanced visible-light-driven photocatalytic and antibacterial activity.
Controllable assembly of well-defined monodisperse Au nanoparticles on hierarchical ZnO microspheres for enhanced visible-light-driven photocatalytic and antibacterial activity.
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DOI：
10.1039/c5nr06359k
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发表时间：
2015-11
期刊：
影响因子：
6.7
通讯作者：
Yuan Wang;Huabin Fang;Yan‐Zhen Zheng;R. Ye;Xia Tao;Jianfeng Chen
中科院分区：
文献类型：
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作者：
Yuan Wang;Huabin Fang;Yan‐Zhen Zheng;R. Ye;Xia Tao;Jianfeng Chen
展示了一种高效可见光驱动的光催化剂，该催化剂由均匀分布的金纳米颗粒（AuNP）组成，通过可控的逐层自组装技术，在分层的 ZnO 微球（ZMS）上明确定义。随着组装数量的增加，ZnO上负载的Au在可见光区域的特征吸收带逐渐增长，表明ZMS/Au复合材料的光捕获能力以及整个组装过程的再现性和可控性增强。通过 EIS 和瞬态光电流响应光谱表征的光电化学性能结果表明，与纯 ZMS 薄膜相比，ZMS/Au 复合材料具有更高的光致电荷分离和转移效率。结果，杂化复合材料表现出增强的对亚甲基蓝和水杨酸的分解活性以及在可见光照射下杀死金黄色葡萄球菌和大肠杆菌的抗菌活性。可以注意到，即使在相当低的 Au/ZnO 重量比（约 1.2%）下，分布均匀的 Au 组分也表现出非凡的光催化作用。这种简便可控的自组装方法可能适用于以简单可控的方式制备高性能可见光驱动的ZMS/Au光催化剂，因此，该技术可以扩展到由纳米结构半导体和贵金属制成的其他等离子体增强异质结构，在环境保护方面具有巨大的潜在应用。
A high-efficiency visible-light-driven photocatalyst composed of homogeneously distributed Au nanoparticles (AuNPs) well-defined on hierarchical ZnO microspheres (ZMS) via a controllable layer-by-layer self-assembly technique is demonstrated. The gradual growth of the characteristic absorption bands of Au loaded on ZnO in the visible light region with an increasing number of assemblies indicates the enhancement of the light harvesting ability of the ZMS/Au composites as well as the reproducibility and controllability of the entire assembly process. Results on the photoelectrochemical performance characterized by EIS and transient photocurrent response spectra indicate that the ZMS/Au composites possess increased photoinduced charge separation and transfer efficiency compared to the pure ZMS film. As a result, the hybrid composites exhibited enhanced decomposition activity for methylene blue and salicylic acid as well as antibacterial activity in killing S. aureus and E. coli under visible light irradiation. It can be noted that well-distributed Au components even at a rather low Au/ZnO weight ratio of ∼1.2% also exhibited extraordinary photocatalysis. Such a facile and controllable self-assembly approach may be viable for preparing high-performance visible-light-driven ZMS/Au photocatalysts in a simple and controllable way, and consequently, the technology may extend to other plasmon-enhanced heterostructures made of nanostructured semiconductors and noble metals for great potential application in environmental protection.