when the NO2sample gas concentration was 198 ppm and 1000 ppm with the tungsten halogen lamp as the light source, the average relative errors of spatial pixels were −3.07% and 8.32%, respectively. When the NO2sample gas concentration was 198 ppm and 1000 ppm with the integrating sphere ...
By ading a polymer layer (PEI in this case), the mecanism behind overall response was changed. This time, the gas molecules were absorbed by the PEI layer, and because BCTZ is a piezoelectric material, changing the mass of the polymeric cover layer induced a response in the BCTZ film....
The irradiation of UV light was carried out by using a 200-W mercury xenon lamp (UVF-204S, San-ei Electric Co., Ltd., Osaka, Japan) under controlled light intensity (5 mW/cm2 at around 360 nm). Visible light (λ > 420 nm) irradiation was also performed by using the same light ...