@article{oai:nagasaki-u.repo.nii.ac.jp:00014473,
 author = {Hyodo, Takeo and Inoue, Hanako and Motomura, Hitomi and Matsuo, Katsuhide and Hashishin, Takeshi and Tamaki, Jun and Shimizu, Yasuhiro and Egashira, Makoto},
 issue = {1},
 journal = {Sensors and Actuators B: Chemical},
 month = {Nov},
 note = {Macroporous (mp-) In2O3-based microspheres as a NO2 sensing material were prepared by the pyrolysis of atomized In(NO3)3 aqueous solutions containing polymethylmethacrylate (PMMA) microspheres (150 nm in diameter) as a template. Well-developed spherical macropores (less than 100 nm in diameter) reflecting the morphology of the PMMA microsphere templates could be formed in the In2O3-based microspheres. The introduction of macropores into In2O3-based microspheres was very effective in improving the NO2 response of their thick films fabricated on an alumina substrate equipped with interdigitated Pt electrodes (gap size: ca. 200 μm) by screen-printing. In addition, the addition of a little amount of SnO2 to the mp-In2O3 microspheres not only lowered the resistance in air but also improved the NO2 response. NO2 sensing properties of non-stacked microspheres of the mp-In2O3 mixed with SnO2 were also investigated by utilizing nano-gap Au electrodes (gap size: ca. 200 nm). The non-stacked microspheres showed fast response and recovery speeds to NO2, because of better diffusion capability of NO2., Sensors and Actuators B: Chemical, 151(1), pp.265-273; 2010},
 pages = {265--273},
 title = {NO2 sensing properties of macroporous In2O3-based powders fabricated by utilizing ultrasonic spray pyrolysis employing polymethylmethacrylate microspheres as a template},
 volume = {151},
 year = {2010}
}