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Erschienen in:
01.01.2013
Novel method for fabrication of NiO sensor for NO2 monitoring
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 1/2013
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Abstract
Nickel oxide (NiO) sensor films were prepared on glass substrate by a sol–gel spin coating technique. These films were characterized for their structural and morphological properties by means of X-ray diffraction, field emission scanning microscopy and atomic force microscopy. The NiO films are oriented along (200) plane with the cubic crystal structure. These films were utilized in nitrogen dioxide gas (NO2) sensor. The dependence of the NO2 response on operating temperature, NO2 concentration was investigated. The NiO film showed selectivity for NO2 over Cl2 compared to H2S \( \left( {{\text{S}}_{{{\text{NO}}_{ 2} }} /{\text{S}}_{{{\text{Cl}}_{ 2} }} = 3 7. 5,{\text{ S}}_{{{\text{NO}}_{ 2} }} /{\text{S}}_{{{\text{H}}_{ 2} {\text{S}}}} = 3. 4} \right) \). The maximum NO2 response of 23.3 % with 85 % stability at gas concentration of 200 ppm at 200 °C was achieved. The response time of 20 s and recovery time of 498 s was also recorded with same operating parameters.