Highly Sensitive Ethanol Gas Sensors of Au Nanoparticle-Adsorbed ZnO Nanorod Arrays via a Photochemical Deposition Treatment

作者：Yen‐Lin Chu, Sheng‐Joue Young, You-Ru Huang, Sandeep Arya, Tung-Te Chu · 发表于：ACS Applied Electronic Materials · 年份：2025 · DOI：10.1021/acsaelm.4c02091 · 被引用次数：53 · 研究领域：Gas Sensing Nanomaterials and Sensors、ZnO doping and properties、Analytical Chemistry and Sensors

High Resolution Image Download MS PowerPoint Slide Vertically aligned zinc oxide (ZnO) nanorod (NR) arrays were successfully grown through a cheap hydrothermal route synthesis method (HTM) (95 °C, 3 h) prepared by 25 mM zinc nitrate hexahydrate [Zn(NO 3 ) 2 ·6H 2 O] and 25 mM hexamethylenetetramine (C 6 H 12 N 4, HMTA). After simple photochemical deposition treatment [0.5 mM chloroauric acid (HAuCl 4 ·4H 2 O)] under ultraviolet (UV) light irradiation, the noble gold nanoparticles (Au NPs) obviously decorated onto the ZnO NR surface. One-dimensional (1D) ZnO NR arrays without and with decorated Au NPs were called ZAuO-0 and ZAuO-1 nanostructures, respectively. Field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and high-resolution transmission electron microscopy (HR-TEM) were performed to explore the surface morphologies and elemental compositions of 1D NR arrays. All nanostructures synthesized easily at a low temperature were structurally uniform with good crystal performance and perpendicular to the substrate surface. The morphological images explored that the average length and diameter of the 1D ZAuO-0 nanostructures were 1.78 μm and 76.9 nm, whereas the average length and diameter of the 1D ZAuO-1 nanostructures were 1.81 μm and 78.2 nm, respectively. 1D ZnO nanostructures were analyzed with an X-ray diffraction (XRD) instrument, and results exhibited that all samples had a hexagonal wurtzite phase with the (002) plane as the mos...