uccessfully obtained via the thermal decomposition of mixed precursor
compound synthesized using a facile coprecipitation route
and its gas sensing properties investigated for many gases (CO, H2
and NO2). According to the XRD results the nanocomposite materials
were a homogeneous mixture of Ni0.9Zn0.1O and ZnO, excluding
the possibility of the simple NiO/ZnO nanocomposite. Enhanced
sensing properties with respect to CO were observed by comparison
with those of pure Ni0.9Zn0.1O and ZnO structures and the
optimal operating temperature was found to be 300 ◦C. It was also
found that the as synthesized composite material can be used at
lower operating temperature (225 ◦C) as selective NO2 gas sensor.
The humidity has no significant influence on the response of
sensor beyond 20%. The heterojunction between Ni0.9Zn0.1O and
ZnO and their catalytic activities are probably the principal factor