Porous nanoplate-assembled CdO/ZnO composite microstructures: A highly sensitive material for ethanol detection

详细信息    查看全文

• 作者：Li-Jing ZhouAuthor Vitae ; Chunguang LiAuthor Vitae ; Xiaoxin Zou ; ^{chemistryzouxx@gmail.com" class="auth_mail}Author Vitae ; Jun ZhaoAuthor Vitae ; Pan-Pan JinAuthor Vitae ; Liang-Liang FengAuthor Vitae ; Mei-Hong FanAuthor Vitae ; Guo-Dong Li ; ^{lgd@jlu.edu.cn" class="auth_mail} ; ^{lifind@21cn.com" class="auth_mail}Author Vitae
• 关键词：ZnO ; CdO ; Nanocomposite ; Gas sensor ; Ethanol
• 刊名：Sensors and Actuators B: Chemical
• 出版年：5 July, 2014
• 年：2014
• 卷：197
• 期：Complete
• 页码：370-375
• 全文大小：1939 K

文摘

Hierarchical CdO/ZnO composite materials composed of porous nanoplates are prepared by simple thermal treatment of a 鈥減re-synthesized鈥?cadmium-zinc bimetallic carbonate precursor. The gas-sensing properties of the as-synthesized nanocomposites are evaluated by a range of gases and organic vapors, and the results show that the gas sensors based on CdO/ZnO nanocomposites exhibit the highest sensing response towards ethanol relative to other testing gases. The optimal ratio of CdO to ZnO in CdO/ZnO nanocomposites is 7.5:100 for ethanol detection. The highest response of CdO/ZnO is 鈭? and 59 times as high as those of the pure ZnO and the pure CdO, respectively. The significantly enhanced sensing performance of the CdO/ZnO nanocomposite is attributed to its novel hierarchical structure and synergetic effect between CdO and ZnO. In addition, the CdO/ZnO sensor exhibits short response and recovery times (<10 s) and a wide response range from 0.5 to 500 ppm for ethanol detection. In the testing range from 0.5 to 500 ppm, the logarithm of sensitivity shows a good linear dependency on the logarithm of ethanol concentration, indicating that the CdO/ZnO sensor may be used for quantitative detection of ethanol vapor.