J. Semicond. > 2015, Volume 36 > Issue 8 > 083005, doi: 10.1088/1674-4926/36/8/083005
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SEMICONDUCTOR MATERIALS

SnO2-doped α-Fe2O3 patulous microtubes for high performance formaldehyde sensing

Ying He1, Deyin Wang1 and Li Liu2,

+ Author Affiliations

 Corresponding author: Li Liu, Email: liul99@jlu.edu.cn

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Abstract: SnO2-doped α-Fe2O3 patulous microtubes (SFPNs) are synthesized by an electrospinning method. The as-synthesized materials are characterized by scanning electron microscope, X-ray powder diffraction and energy dispersive spectroscopy. The gas sensing results show SFPNs possess an excellent sensing property to formaldehyde. The response value of SFPNs gas sensor to 50 ppm formaldehyde is 25.4 at 220 ℃. The lowest detecting limit of 1 ppm formaldehyde is 3.2. Response and recovery characteristic curves of SFPNs gas sensors to 1, 2, 3, 5, 5, 3, 2 and 1 ppm formaldehyde are also tested. The results show a good reversibility and repeatability of SFPNs gas sensors. The sensor exhibits a high selectivity in the presence of acetone, ethanol, toluene, ammonia, hydrogen, carbon monoxide and butane. Moreover, the sensor has a good long-time stability.

Key words: SnO2-doped α-Fe2O3, microtubes, electrospinning, formaldehyde, gas sensor



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Fig. 1.  (a) Schematic images of gas sensor and (b) process of gas-sensing tests.

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Fig. 2.  SEM and TEM images of SnO2-doped α-Fe2O3 patulous microtubes.

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Fig. 3.  (a) XRD and (b) EDS patterns of SnO2-doped α-Fe2O3 patulous microtubes.

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Fig. 4.  Responses of sensors based on SnO2-doped α-Fe2O3 patulous microtubes to 50 ppm formaldehyde at different operating temperatures.

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Fig. 5.  Responses of sensors based on SnO2-doped α-Fe2O3 patulous microtubes to different formaldehyde concentration in the range of 1-200 ppm at 220 ℃.

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Fig. 6.  Response versus time curves of sensors based on SnO2-doped α-Fe2O3 patulous microtubes to 1, 2, 3, 5, 5, 3, 2, 1 ppm formaldehyde at 220 ℃.

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Fig. 7.  Responses of sensors based on SnO2-doped α-Fe2O3 patulous microtubes to 5, 50, 200 ppm different gases at 220 ℃.

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Fig. 8.  Long-time stability of sensors based on SnO2-doped α-Fe2O3 patulous microtubes to 1, 5, 50, 100, 500 and 1000 ppm formaldehyde at 220 ℃.

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Fig. 9.  Schematic images of gas sensing mechanism of sensors based on SnO2-doped α-Fe2O3 patulous microtubes to formaldehyde.

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Table 1.   Comparison between sensors based on SnO2-doped α-Fe2O3 patulous microtubes and other formaldehyde gas sensors.

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    Received: 28 November 2014 Revised: Online: Published: 01 August 2015

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      Article Navigation >  Journal of Semiconductors  > 2015  >  36(8): 083005
      Ying He, Deyin Wang, Li Liu. SnO2-doped α-Fe2O3 patulous microtubes for high performance formaldehyde sensing[J]. Journal of Semiconductors, 2015, 36(8): 083005. doi: 10.1088/1674-4926/36/8/083005 Y He, D Y Wang, L Liu. SnO2-doped α-Fe2O3 patulous microtubes for high performance formaldehyde sensing[J]. J. Semicond., 2015, 36(8): 083005. doi: 10.1088/1674-4926/36/8/083005.Export: BibTex EndNote
      Citation:
      Ying He, Deyin Wang, Li Liu. SnO2-doped α-Fe2O3 patulous microtubes for high performance formaldehyde sensing[J]. Journal of Semiconductors, 2015, 36(8): 083005. doi: 10.1088/1674-4926/36/8/083005

      Y He, D Y Wang, L Liu. SnO2-doped α-Fe2O3 patulous microtubes for high performance formaldehyde sensing[J]. J. Semicond., 2015, 36(8): 083005. doi: 10.1088/1674-4926/36/8/083005.
      Export: BibTex EndNote
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      SnO2-doped α-Fe2O3 patulous microtubes for high performance formaldehyde sensing

      doi: 10.1088/1674-4926/36/8/083005
      • 1.

        College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130012, China

      • 2.

        State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China

      Funds:

      Project supported by the Jilin Provincial Science and Technology Department (No. 20140204027GX) and the Competition Funded Projects of “Challenge Cup” College Students’ Extracurricular Academic Science and Technology Works (No. 2014LG064).

      More Information
      • Corresponding author: Email: liul99@jlu.edu.cn
      • Received Date: 2014-11-28
      • Accepted Date: 2015-03-22
      • Published Date: 2015-01-25

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