Gas sensing properties of nanostructured bismuth oxychloride

详细信息    查看全文

• 作者：Carlos R.  ; Michel  ; ;   ; ^{michelucr@yahoo.es} ; Narda L. Ló ; pez  ; Contreras ; Alma H.  ; Martí ; nez-Preciado[Author vitae]
• 关键词：BiOCl ; Nanostructured ribbons ; Gas sensors
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2011
• 出版时间：15 December 2011
• 年：2011
• 卷：160
• 期：1
• 页码：271-277
• 全文大小：1269 K

文摘

In this work, nanostructured bismuth oxychloride (BiOCl) was prepared by a surfactant-assisted method. Bismuth trichloride and dioctyl sulfosuccinate (AOT) were dissolved in non-aqueous media, producing a fine precipitate. The calcination of the precipitated particles at 180 ¡ãC produced 3D hierarchical BiOCl semi-spherical architectures, assembled by microplates. The increase of the calcination temperature to 600 ¡ãC produced nanostructured ribbons, which are formed by the stacking of several BiOCl layers. Other microstructures can be formed at different calcination temperatures or by using other surfactants. Thick-films of the as-prepared BiOCl ribbons were made by its direct deposition on alumina substrates. The gas sensing characterization was performed at 300 and 400 ¡ãC using alternating current (AC). The tests gases were compressed air, CO, CO₂ and O₂. Humidity effects were discarded by using the extra dry version of these gases. At 300 ¡ãC, reproducible CO gas sensing patterns were obtained; however, the detection of CO₂ and O₂ produced unreliable results. At 400 ¡ãC, reliable gas sensing patterns were obtained in CO, CO₂ and O₂. According to its gas response, BiOCl behaved as a p-type seminconductor material.