Faculty of Materials Science, Lomonosov Moscow State University, Leninskiye Gory 1-73, Moscow, 119991, Russia.
Faculty of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow, 119991, Russia.
Chemistry. 2018 Dec 17;24(71):18952-18962. doi: 10.1002/chem.201803502. Epub 2018 Nov 15.
Composites of WS nanotubes (NT-WS ) and gold nanoparticles (AuNPs) were prepared using aqueous HAuCl solutions and subjected to surface analysis. The obtained materials were jointly characterized by X-ray photoelectron (XPS), Raman scattering (RSS), and ultraviolet photoelectron (UPS) spectroscopies. Optical extinction spectroscopy and electron energy loss spectroscopy in the scanning transmission electron microscopy regime (STEM-EELS) were also employed to study plasmon features of the nanocomposite. It was found that AuNPs deposition is accompanied by a partial oxidative dissolution of WS , whereas Au-S interfacial species could be responsible for the tight contact of metal nanoparticles and the disulfide. A remarkable sensitivity of n-type resistance of NT-WS and Au-NT-WS to the adsorption of NO gas was also demonstrated at room temperature using periodical illumination by a 530 nm light-emitting diode. Au-NT-WS nanocomposites are found to possess a higher photoresponse and enhanced sensitivity in the 0.25-2.0 ppm range of NO concentration, as compared to the pristine NT-WS . This behaviour is discussed within the physisorption-charge transfer model to explore sensing properties of the nanocomposites.
WS 纳米管（NT-WS）和金纳米粒子（AuNPs）的复合材料是使用水合 HAuCl 溶液制备的，并进行了表面分析。所得到的材料通过 X 射线光电子能谱（XPS）、拉曼散射（RSS）和紫外光电子能谱（UPS）光谱学进行了联合表征。还采用扫描透射电子显微镜中的电子能量损失谱（STEM-EELS）进行了等离子体特征的研究。研究发现，AuNPs 的沉积伴随着 WS 的部分氧化溶解，而 Au-S 界面物种可能是金属纳米颗粒和二硫化物紧密接触的原因。还通过使用 530nm 发光二极管周期性照明，在室温下证明了 NT-WS 和 Au-NT-WS 的 n 型电阻对 NO 气体的吸附具有显著的敏感性。与原始 NT-WS 相比，Au-NT-WS 纳米复合材料在 0.25-2.0ppm 的 NO 浓度范围内具有更高的光响应和增强的灵敏度。这种行为在物理吸附-电荷转移模型中进行了讨论，以探索纳米复合材料的传感性能。
