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Vol. 192, Issue 9, September 2015, pp. 61-65

 

Bullet

 

Larger Selectivity of the V2O5 Nano-particles Sensitivity to NO2 than NH3
 

1, 2, 3 Amos Adeleke Akande, 1 Bonex Wakufwa Mwakikunga, 2 Koena Erasmus Rammutla, 3 Augusto Machatine

1 DST/CSIR National Centre for Nano-Structured Materials, P O Box 395, Pretoria 0001, South Africa
2 University of Limpopo, Department of Physics, P/Bag X1106, Sovenga, 0727, RSA
3 School of Physics, University of Pretoria, Pretoria, 0002, South Africa
1 Tel.: +27 12 841 4771, fax: +27 12 841 2229

1 E-mail: aaakande@csir.co.za, bmwakikunga@csir.co.za

 

Received: 26 March 2015 /Accepted: 31 August 2015 /Published: 30 September 2015

Digital Sensors and Sensor Sysstems

 

Abstract: V2O5 nanoparticles (NPs) were prepared using microwave irradiation technique and characterized using X-ray diffraction (XRD), Raman spectroscopy (RS), Field emission scanning electron microscopy (FESEM). The physiosorption analysis with the aid of Brunauer-Emmiter-Teller (BET) method shows high surface area and relatively high pore diameter. The material’s gas sensing capabilities was tested for NH3 and NO2 keeping operating temperature at 300 K. An increase in electrical resistance were observed for both NH3 (reducing gas) and NO2 (oxidizing gas). This increase in resistance has been explained from the fact that V2O5 possess both n-type and p-type conductivity with NH3 preferring to interact with the n-type phase and NO2 attaching to p-type adsorption sites. The sensitivity of the p- type V2O5 phase to NO2 is found to be 32 times greater than the sensitivity of the n-type V2O5 phase to NH3. The results show that V2O5 is 32 times more sensitive to NO2 than NH3.

 

Keywords: V2O5, Nano-particles, Selectivity, Sensitivity, NH3, NO2, Oxidizing gas, Reducing gas, n-type, p-type, Conduction band.

 

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