材料科学
X射线光电子能谱
化学工程
纳米材料
表面改性
纳米颗粒
氧化物
分析化学(期刊)
吸附
作者
Lorenzo Bigiani,Chiara Maccato,Davide Barreca,Alberto Gasparotto
出处
期刊:Surface Science Spectra
[American Vacuum Society]
日期:2020-08-17
卷期号:27 (2): 024005-
被引量:3
摘要
The present study is devoted to the characterization of MnO2-Ag and MnO2-SnO2 nanocomposites of technological interest as gas sensors for food quality control and security applications. In particular, MnO2 nanomaterials were deposited on polycrystalline alumina substrates by plasma enhanced-chemical vapor deposition and functionalized with either Ag or SnO2 nanoparticles by means of radio frequency-sputtering. The target materials were investigated by a multitechnique approach, evidencing the successful formation of nanocomposites with tailored morphology, featuring an intimate contact of their components. Herein, the attention is dedicated to the characterization of system surface composition by x-ray photoelectron spectroscopy. Besides wide scan spectra, data obtained by the analysis of the C 1s, O 1s, Mn 2p, Mn 3s, Ag 3d, Sn 3d, and silver Auger signal spectral features are presented and critically discussed. The results highlight the occurrence of phase-pure MnO2 and SnO2 free from other Mn and Sn oxidation states and of appreciable silver surface oxidation in the target nanomaterials.
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