Synergistic effects of codecoration of oxide nanoparticles on the gas sensing performance of In₂O₃ nanorods

详细信息    查看全文

• 作者：Sunghoon Park^aAuthor Vitae ; Gun-Joo Sun^aAuthor Vitae ; Hyejoon Kheel^aAuthor Vitae ; Wan In Lee^bAuthor Vitae ; Sangmin Lee^cAuthor Vitae ; Seung-Bok Choi^dAuthor Vitae ; Chongmu Lee^a ; ^{cmlee@inha.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; ^{kjmu7164@gmail.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Gas sensor ; In2O3 ; Co3O4 ; Fe2O3 ; Codecoration
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：227
• 期：Complete
• 页码：591-599
• 全文大小：3307 K

文摘

n-In₂O₃ nanorods codecorated with n-Fe₂O₃ and p-Co₃O₄ nanoparticles were synthesized by the thermal evaporation of In₂S₃ powders in an oxidizing atmosphere followed by the solvothermal deposition of Fe₂O₃ and Co₃O₄ nanoparticles, and their ethanol gas sensing properties were examined. The p-Co₃O₄-decorated n-In₂O₃ nanorods exhibited stronger and faster response to ethanol gas than the n-Fe₂O₃-decorated n-In₂O₃ nanorods due to the larger modulation of the conduction channel width and interfacial potential barrier height, and stronger catalytic activity of p-Co₃O₄ than n-Fe₂O₃. Furthermore, the codecorated In₂O₃ nanorod sensor exhibited significantly stronger and faster response to ethanol gas than its mono-oxide nanoparticle-decorated counterparts under the condition of the same total amount of the decorating nanoparticles. The origin of the synergistic effects of codecoration on the ethanol sensing properties of the In₂O₃ nanorod sensor is not the formation of compounds or nanoalloys between the oxides but the formation of a large number of the p–n junctions between the two different types of decorating oxides, i.e., Fe₂O₃–Co₃O₄ p–n junctions in addition to the Co₃O₄–In₂O₃ p–n junctions.