Detection of nitrogen dioxide down to ppb levels using flower-like tungsten oxide nanostructures under different annealing temperatures

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• 作者：Chong Wang ; Mengdi Ding ; Xueying Kou ; Lanlan Guo ; Changhao Feng ; Xin Li ; Hong Zhang ; Peng Sun ; Yanfeng Sun ; ^{syf@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Geyu Lu ; ^{lugy@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：WO3 ; Flower-like ; Solvothermal ; Gas sensor ; NO2
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：483
• 期：Complete
• 页码：314-320
• 全文大小：2396 K

文摘

3D hierarchical flower-like WO₃·0.33H₂O nanostructures were synthesized via a facile solvothermal method without using any template or surfactant. After annealed at high temperature, the as-prepared WO₃·0.33H₂O would partly or fully transform into monoclinic WO₃ with the morphology almost unchanged. Gas sensing properties of the sensor based on these flower-like nanostructures with the relationship of annealing temperature were also investigated systematically. The experiment results indicate the sensor shows highest response to NO₂ when the annealing temperature is 500 °C. At the same time, the detection limit can be as low as ∼5 ppb level. Thus, the novel flower-like nanostructures might be a promising material for designing NO₂ gas sensor with high performance.