Superior ethanol-sensing properties based on Ni-doped SnO₂ p-n heterojunction hollow spheres

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• 作者：Yuejiao Chen  ; [Author Vitae] ; Ling Yu  ; [Author Vitae] ; Dandan Feng  ; [Author Vitae] ; Ming Zhuo  ; [Author Vitae] ; Ming Zhang  ; [Author Vitae] ; Endi Zhang  ; [Author Vitae] ; Zhi Xu  ; [Author Vitae] ; Qiuhong Li ; ^{liqiuhong2004@hotmail.com}  ; [Author Vitae] ; Taihong Wang ; ^{thwang@hnu.edu.cn}  ; [Author Vitae]
• 关键词：Ni-doped SnO2 ; p&ndash ; n heterojunction ; Ethanol sensor ; Enhanced response
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：20 May, 2012
• 卷：166-167
• 期：Complete
• 页码：61-67
• 文件大小：1354 K

摘要

This paper reported a novel sensing material of porous Ni-doped SnO₂ hollow spheres with nanoheterostructures, which were synthesized by a low-cost and environment-friendly hydrothermal strategy. In the process of synthesis, long-chain polymers nickel nitrilotriacetic acid (NiNTA) were formed previously and then successfully heteroconnected with SnO₂ through a series of hydrothermal reactions for the reason that nitrilotriacetic acid (NTA) could be dissolved in the aqueous solution of NaSnO₃, leading to the complete change of previous morphology. The response of the sensor based on porous Ni-doped SnO₂ hollow spheres is up to 59 at 100 ppm ethanol and the detection limit can be dropped to 1 ppm-level, which exhibits enhanced response compared with many ethanol sensors based on pure SnO₂ hollow spheres. Such good performance is probably attributed to the formation of p-n junctions between NiO and SnO₂, which increase the resistance of sensor and the depletion layers.