Novel Synthesis and Gas Sensing Performances of CuO鈥揟iO2 Nanocomposites Functionalized with Au Nanoparticles

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• 作者：Davide Barreca ; Giorgio Carraro ; Elisabetta Comini ; Alberto Gasparotto ; Chiara Maccato ; Cinzia Sada ; Giorgio Sberveglieri ; Eugenio Tondello
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：June 2, 2011
• 年：2011
• 卷：115
• 期：21
• 页码：10510-10517
• 全文大小：966K
• 年卷期：v.115,no.21(June 2, 2011)
• ISSN：1932-7455

文摘

CuO鈥揟iO₂ nanocomposites were synthesized on Al₂O₃ substrates by a novel chemical vapor deposition (CVD) route, based on the sequential growth of CuO matrices (550 掳C) and the overdispersion of TiO₂ (400 掳C), both performed under O₂ + H₂O atmospheres. The obtained supported materials were subsequently functionalized with gold nanoparticles (NPs) by means of radio frequency (rf) sputtering. The system structure, nano-organization, and chemical composition were characterized by a multitechnique approach, using glancing incidence X-ray diffraction (GIXRD), field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and secondary ion mass spectrometry (SIMS). For the first time, both CuO鈥揟iO₂ and CuO鈥揟iO₂鈥揂u nanosystems were tested as resistive gas sensors for toxic and flammable gases (CH₃CH₂OH, H₂, and O₃), revealing attractive performances even at moderate working temperatures. Interestingly, the functional response could be appreciably enhanced upon introduction of gold NPs, highlighting the present CuO鈥揟iO₂鈥揂u nanosystems as appealing candidates in view of technological applications.