Do T Anh Thu, Ho Truong Giang, Bui Thu Hoai, Pham Quang Ngan, Giang Hong Thai, Do Thi Thu, Nguyen Duc Van, Tran Dai Lam
Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Caugiay, 100000, Hanoi, Vietnam.
Petro Vietnam University, 762 Cach Mang Thang 8, Longtoan, 790000, Ba Ria-Vung Tau, Vietnam.
Beilstein J Nanotechnol. 2018 Mar 1;9:771-779. doi: 10.3762/bjnano.9.70. eCollection 2018.
Pure and Au-decorated sub-micrometer ZnO spheres were successfully grown on glass substrates by simple chemical bath deposition and photoreduction methods. The analysis of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, energy-dispersive X-ray spectroscopy (EDS), UV-vis absorption, and photoluminescence (PL) spectra results were used to verify the incorporation of plasmonic Au nanoparticles (NPs) on the ZnO film. Time-resolved photoluminescence (TRPL) spectra indicated that a surface plasmonic effect exists with a fast rate of charge transfer from Au nanoparticles to the sub-micrometer ZnO sphere, which suggested the strong possibility of the use of the material for the design of efficient catalytic devices. The NO sensing ability of as-deposited ZnO films was investigated with different gas concentrations at an optimized sensing temperature of 120 °C. Surface decoration of plasmonic Au nanoparticles provided an enhanced sensitivity (141 times) with improved response (τ = 9 s) and recovery time (τ = 39 s). The enhanced gas sensing performance and photocatalytic degradation processes are suggested to be attributed to not only the surface plasmon resonance effect, but also due to a Schottky barrier between plasmonic Au and ZnO structures.
通过简单的化学浴沉积和光还原方法，在玻璃基板上成功生长出了纯净的以及金修饰的亚微米级氧化锌球体。利用扫描电子显微镜（SEM）和透射电子显微镜（TEM）图像分析、能量色散X射线光谱（EDS）、紫外可见吸收光谱和光致发光（PL）光谱结果，验证了等离子体金纳米颗粒（NPs）在氧化锌薄膜上的掺入情况。时间分辨光致发光（TRPL）光谱表明存在表面等离子体效应，电荷从金纳米颗粒快速转移到亚微米级氧化锌球体，这表明该材料用于设计高效催化装置具有很大可能性。在120℃的优化传感温度下，研究了沉积态氧化锌薄膜对不同气体浓度的NO传感能力。等离子体金纳米颗粒的表面修饰提高了灵敏度（141倍），改善了响应时间（τ = 9 s）和恢复时间（τ = 39 s）。增强的气敏性能和光催化降解过程被认为不仅归因于表面等离子体共振效应，还归因于等离子体金与氧化锌结构之间的肖特基势垒。
