NO2 Gas Sensor Made of Porous MoO3 Sputtered Films Toshinari Yamazaki, Chengji Jin, Atsushi Nakayama, Koji Ito, Toshio Yoshizawa, Toshio Kikuta, Noriyuki Nakatani, Tatsuo Yamabuchi Jpn. J. Appl. Phys., 44(1B), 792-795 (2005). Jan. No.1B