Higo Morihide, Ono Kazuma, Yamaguchi Kazutoshi, Mitsushio Masaru, Yoshidome Toshifumi, Nakatake Sadafumi
Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, 1-21-40 Korimoto, Kagoshima, 890-0065, Japan.
Kagoshima University Innovation Center, 1-21-40 Korimoto, Kagoshima, 890-0065, Japan.
Anal Sci. 2020 Sep 10;36(9):1081-1089. doi: 10.2116/analsci.20P064. Epub 2020 Apr 24.
The chemical properties of thin (∼0.6 nm) gold oxide layers prepared by an oxygen-dc glow discharge from gold films at room temperature in various solvents and solutions were studied using a surface plasmon resonance (SPR)-based optical waveguide sensing system and X-ray photoelectron spectroscopy (XPS). New insights into the stability and reactivity of gold oxides under these conditions were obtained. The O 1s XPS spectra show three oxygen species, comprising components I, II, and III in the gold oxides, and components I and II are present in this order from the top surface of the oxide (component III). The gold oxide is stable in various solvents (water, methanol, ethanol, acetone, acetonitrile, diethyl ether, chloroform, hydrocarbons) for 10 - 30 min at room temperature. The gold oxide decomposes in aqueous 10 M solutions of acetaldehyde, hydrochloric acid, and sodium hydroxide during these periods. Gold oxide decomposition in these solutions was monitored by SPR and the decomposition rates were obtained. Decomposition of the gold oxides was confirmed and their surfaces were characterized after decomposition by XPS.
利用基于表面等离子体共振（SPR）的光波导传感系统和X射线光电子能谱（XPS），研究了在室温下于各种溶剂和溶液中通过从金膜进行氧直流辉光放电制备的薄（约0.6纳米）金氧化物层的化学性质。获得了关于这些条件下金氧化物稳定性和反应性的新见解。O 1s XPS光谱显示金氧化物中有三种氧物种，包括组分I、II和III，并且从氧化物的顶面起按此顺序存在组分I和II（组分III）。金氧化物在各种溶剂（水、甲醇、乙醇、丙酮、乙腈、二乙醚、氯仿、碳氢化合物）中于室温下稳定10 - 30分钟。在这些时间段内，金氧化物在乙醛、盐酸和氢氧化钠的10 M水溶液中分解。通过SPR监测金氧化物在这些溶液中的分解情况，并获得分解速率。确认了金氧化物的分解，并在分解后通过XPS对其表面进行了表征。
