Citation: CHEN Peng-Peng, WANG Jing, ZHANG Chun-Li, HAO Yu-Wen, DU Hai-Ying. Preparation of Electrospun In₂O₃/CdO Composite and Its Formaldehyde-Sensing Properties[J]. Acta Physico-Chimica Sinica, ;2013, 29(08): 1827-1836. doi: 10.3866/PKU.WHXB201306091 shu

Preparation of Electrospun In₂O₃/CdO Composite and Its Formaldehyde-Sensing Properties

1.
1 School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, P. R. China;
2 Department of Electromechanical Engineering & Information, Dalian Nationalities University, Dalian 116600, P. R. China

Received Date: 26 March 2013
Available Online: 9 June 2013
Fund Project: 国家自然科学基金(61176068, 61131004, 61001054)资助项目 (61176068, 61131004, 61001054)

In(NO₃)₃/polyvinyl pyrrolidone (PVP) nanofiber precursors were synthesized using a traditional electrospinning method, and were then annealed at 500, 600, and 700℃ to form In₂O₃ nanofibers. The as-prepared In₂O₃ nanofibers were characterized using X-ray diffraction (XRD), thermal gravimetry and differential thermal analysis (TG/DTA), and field-emission scanning electron microscopy (FE-SEM). The results show that the In₂O₃ nanofibers crystallize well, with a small average grain size (about 24 nm) and a od mesoporous structure, when annealed at 500℃. The In₂O₃ nanofibers annealed at the three temperatures were further used to fabricate gas sensors. The test results show that the sensor based on In₂O₃ annealed at 500℃ has the highest response (about 7) to 10×10^-6 (volume fraction, φ) formaldehyde (HCHO) at an operating temperature of 240℃. CdO nanoparticles were also prepared using the same method; XRD and FE-SEM show that the average grain size of CdO is about 68 nm. Finally, the as-prepared In₂O₃ nanofibers were mixed with the as-prepared CdO in molar ratios of 1:1, 10:1, and 20:1, and the mixtures were used to fabricate gas sensors. The HCHO-sensing properties of the sensors based on pure In₂O₃ and In₂O₃/CdO composites with different molar ratios were investigated at each optimum temperature. The results show that the In₂O₃/CdO composite with a molar ratio of 10:1 has excellent sensing properties: the response to 10×10^-6 HCHO is 13.6, the response/recovery time is 140 s/32 s, and the selectivity is better at a lower operating temperature of 200 °C. In addition, the HCHO-sensing mechanism of the sensors based on the In₂O₃/CdO composites was briefly analyzed.
- In₂O₃,
- CdO,
- Composite,
- Formaldehyde,
- Gas-sensitivity
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Preparation of Electrospun In2O3/CdO Composite and Its Formaldehyde-Sensing Properties

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通讯作者: 陈斌, bchen63@163.com

Preparation of Electrospun In₂O₃/CdO Composite and Its Formaldehyde-Sensing Properties