Preparation and Gas-Sensitive Properties of Silver Sensitized Indium Oxide Hollow Nanospheres
Gas sensor has the advantages of selectivity,stability,high sensitivity and moisture resistance,and also has many applications in the detection of toxic and harmful gases. Ag-In2O3 hollow nanospheres( Ag-In2O3 HNSs) are successfully prepared by aging and sub-sequent processes using Ag@C core-shell nanospheres as templates. The crystal structure,morphology and chemical composition of the samples are characterized adopting by field emission scanning electron microscopy ( SEM ) , transmission electron microscopy ( TEM ) , X-ray diffractometer( XRD) ,UV-absorption spectroscopy( UV) ,Raman spectroscopy( Raman) ,energy spectral surface scanning( EDX) and X-ray photoelectron spectroscopy( XPS) . The gas sensing performance of the Ag-In2O3 HNSs based gas sensor for triethylamine (TEA)steam is studied,the results show that compared with the hollow indium oxide nanospheres(In2O3 HNSs),the Ag-In2O3 HNSs based gas sensor has higher sensitivity. At the optimum temperature(220℃),the response value of Ag-In2O3 HNSs based gas sensor to 200×10-6 TEA is was up to 276,which is more than 20 times of the response value of In2O3 HNSs gas sensor. Finally,the factors that improve the sensor performance are summarized.
gas sensorTEA detectionsonochemistringAg modificationIn2O3
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