Au/蔚-Fe2O3 Nanocomposites as Selective NO2 Gas Sensors

详细信息    查看全文

• 作者：Daniel Peeters ; Davide Barreca ; Giorgio Carraro ; Elisabetta Comini ; Alberto Gasparotto ; Chiara Maccato ; Cinzia Sada ; Giorgio Sberveglieri
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：June 5, 2014
• 年：2014
• 卷：118
• 期：22
• 页码：11813-11819
• 全文大小：389K
• 年卷期：v.118,no.22(June 5, 2014)
• ISSN：1932-7455

文摘

A combined chemical vapor deposition (CVD)/radio frequency (rf) sputtering approach to Au/Fe₂O₃ nanocomposites based on the scarcely investigated 蔚-iron(III) oxide polymorph is reported. The developed materials, analyzed by field emission-scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDXS), X-ray photoelectron spectroscopy (XPS), and secondary ion mass spectrometry (SIMS), consisted of iron oxide nanorods decorated by gold nanoparticles (NPs), whose content and distribution could be tailored as a function of sputtering time. Interestingly, the intimate Au/蔚-Fe₂O₃ interfacial contact along with iron oxide one-dimensional (1D) morphology resulted in promising performances for the selective detection of gaseous NO₂ at moderate working temperatures. At variance with the other iron(III) oxide polymorphs (伪-, 尾-, and 纬-Fe₂O₃), that display an n-type semiconducting behavior, 蔚-Fe₂O₃ exhibited a p-type response, clearly enhanced by Au introduction. As a whole, the obtained results indicate that the sensitization of p-type materials with metal NPs could be a valuable tool for the fabrication of advanced sensing devices.