"Wei Zhou,Zhe Chen,Nagayasu Oshima,Kenji Ito,Brian O'Rourke,Ryunosuke Kuroda,Ryoichi Suzuki,Hiroshi Yanagishita,Takuro Tsutsui,Akira Uedono,Noriyosu Hayashizaki","In-situ characterization of free-volume holes in polymer thin films under controlled humidity conditions with an atmospheric positron probe microanalyzer",,"Applied Physics Letters",,"Vol. 101",,,2012,July