title: Vertically ordered hematite nanotube array as an ultrasensitive and rapid response acetone sensor.
abstract: Vertically ordered nanotube array is a desirable configuration to improve gas sensing properties of the hematite which is the most abundant and cheapest metal oxide semiconductor on earth but has low and sluggish chemiresistive responses. We have synthesized a vertically aligned, highly ordered hematite nanotube array directly on a patterned SiO2/Si substrate and then it used as a gas sensor without additional processing. The nanotube array sensor shows unprecedentedly ultrahigh and selective responses to acetone with detection limits down to a few parts per billion and response time shorter than 3 s.
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-744, Korea.
authors.forename: Do Hong
authors.initials: DH
authors.lastname: Kim
authors.forename: Young-Seok
authors.initials: YS
authors.lastname: Shim
authors.forename: Jong-Myeong
authors.initials: JM
authors.lastname: Jeon
authors.forename: Hu Young
authors.initials: HY
authors.lastname: Jeong
authors.forename: Sung Soo
authors.initials: SS
authors.lastname: Park
authors.forename: Young-Woon
authors.initials: YW
authors.lastname: Kim
authors.forename: Jin-Sang
authors.initials: JS
authors.lastname: Kim
authors.forename: Jong-Heun
authors.initials: JH
authors.lastname: Lee
authors.forename: Ho Won
authors.initials: HW
authors.lastname: Jang
keywords: acetone sensor; earth abundant; hematite; nanotube array; ultrasensitive