ZnO–SnO2 nanotubes surface engineered by Ag nanoparticles: synthesis, characterization, and highly enhanced HCHO gas sensing properties
ZnO–SnO2 nanotubes surface engineered by Ag nanoparticles: synthesis, characterization, and highly enhanced HCHO gas sensing properties
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DOI：
10.1039/c3tc00689a
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发表时间：
2013-02
影响因子：
6.4
通讯作者：
Lin Xu;Ruiqing Xing;Jian Song;Wen Xu;Hongwei Song
中科院分区：
文献类型：
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作者：
Lin Xu;Ruiqing Xing;Jian Song;Wen Xu;Hongwei Song
采用静电纺丝技术和种子生长法制备了纳米银包覆的ZnO-SnO 2纳米管（直径约250 nm，壁厚约20 nm），并对纳米银的含量进行了系统的控制。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、紫外-可见光谱（UV-vis）和X射线光电子能谱（XPS）等技术对样品进行了表征，结果表明ZnO-SnO 2纳米管与Ag纳米粒子之间存在较强的相互作用。研究了Ag包覆ZnO-SnO 2纳米管对甲醛气体的敏感特性，结果表明，Ag纳米管的包覆显著改善了ZnO-SnO 2纳米管对甲醛气体的敏感特性，包括工作温度的显著降低、响应速度的显著提高和响应动力学的缩短。结果表明，Ag含量为10%的纳米管气敏元件的响应比ZnO-SnO 2纳米管气敏元件的响应提高了1.6倍，而工作温度降低了约140 °C。此外，它对甲醛的检测限非常低（9 ppb）。提高甲醛气敏性能的主要原因是由于银纳米颗粒和ZnO-SnO 2纳米管之间的“溢出效应”。总的来说，通过静电纺丝合成的Ag包覆的ZnO-SnO 2纳米管是一种有前途的ppb级HCHO传感器和有效的室内HCHO检测器。
Novel Ag nanoparticles (NPs) coated ZnO–SnO2 nanotubes (NTs, diameter ∼250 nm, wall thickness ∼20 nm) were fabricated using a facile electrospinning technique together with a seed-mediated growth procedure, and the amount of surface Ag NPs was systematically controlled. They were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-vis spectra and X-ray photoelectron spectroscopy (XPS) techniques, which showed that strong interactions occurred between the ZnO–SnO2 NTs and the Ag NPs. The sensing properties of the Ag coated ZnO–SnO2 NTs for HCHO gas were carefully studied and the results indicated that the sensing properties were significantly modified by the coating of Ag NPs, including a considerably decreased working temperature, a highly improved response and shortened response dynamics. The 10% Ag coated NTs gas sensor was the optimum sensor, demonstrating an enhanced response of ∼6 times that of the ZnO–SnO2 NTs, while the working temperature was decreased by about 140 °C. Additionally, it showed a very low detection limit (9 ppb) for HCHO. The main reason for the enhanced HCHO gas sensing properties was attributed to “spillover effects” between the Ag NPs and ZnO–SnO2 NTs. Overall, the Ag coated ZnO–SnO2 NTs synthesized through electrospinning make a promising ppb-level HCHO sensor and an effective indoor HCHO detector.