Comparison study of conductometric, optical and SAW gas sensors based on porous sol–gel silica films doped with NiO and Au nanocrystals

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• 作者：Enrico Della Gaspera ; Dario Buso ; Massimo Guglielmi ; Aless ; ro Martucci ; Valentina Bello ; Giovanni Mattei ; Michael L. Post ; Carlo Cantalini ; Stefano Agnoli ; Gaetano Granozzi ; Abu Zafar Sadek ; Kourosh K
• 关键词：Sol– ; gel film ; Nanoparticles ; Optical gas sensor ; Surface acoustic wave gas sensor
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2010
• 出版时间：7 January 2010
• 年：2010
• 卷：143
• 期：2
• 页码：567-573
• 全文大小：638 K

文摘

Conductometric, optical and surface acoustic wave gas sensors based on sol–gel silica porous films doped with NiO and Au nanoparticles are studied. The nanocomposite films are characterized by optical absorption in the visible and near-infrared region, spectroscopic ellipsometry, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) analysis and X-ray photoemission spectroscopy (XPS). They show poor conductometric gas sensing response toward CO and H₂. However, both optical and surface acoustic wave (SAW) responses are reversible and stable to H₂. Moreover, exploiting the wavelength dependence of the optical sensor response it is possible to selective recognition of H₂. Choosing the appropriate wavelength, almost no variation in absorption is observed when introducing different gases into the testing chamber.