title: Ultrasensitive Room-Temperature Operable Gas Sensors Using p-Type Na:ZnO Nanoflowers for Diabetes Detection.
abstract: Ultrasensitive room-temperature operable gas sensors utilizing the photocatalytic activity of Na-doped p-type ZnO (Na:ZnO) nanoflowers (NFs) are demonstrated as a promising candidate for diabetes detection. The flowerlike Na:ZnO nanoparticles possessing ultrathin hierarchical nanosheets were synthesized by a facile solution route at a low processing temperature of 40 °C. It was found that the Na element acting as a p-type dopant was successfully incorporated in the ZnO lattice. On the basis of the synthesized p-type Na:ZnO NFs, room-temperature operable chemiresistive-type gas sensors were realized, activated by ultraviolet (UV) illumination. The Na:ZnO NF gas sensors exhibited high gas response (S of 3.35) and fast response time (∼18 s) and recovery time (∼63 s) to acetone gas (100 ppm, UV intensity of 5 mW cm-2), and furthermore, subppm level (0.2 ppm) detection was achieved at room temperature, which enables the diagnosis of various diseases including diabetes from exhaled breath.
authors.affiliation: Department of Physics, Faculty of Science and Technology, Thammasat University , Pathum Thani, Thailand.
authors.forename: Rawat
authors.initials: R
authors.lastname: Jaisutti
authors.forename: Minkyung
authors.initials: M
authors.lastname: Lee
authors.forename: Jaeyoung
authors.initials: J
authors.lastname: Kim
authors.forename: Seungbeom
authors.initials: S
authors.lastname: Choi
authors.affiliation: Department of Electronic Materials Engineering, Kwangwoon University , Seoul, Korea.
authors.forename: Tae-Jun
authors.initials: TJ
authors.lastname: Ha
authors.affiliation: Department of Photonics and Nanoelectronics, Hanyang University , Ansan, Korea.
authors.forename: Jaekyun
authors.initials: J
authors.lastname: Kim
authors.forename: Hyoungsub
authors.identifier: http://orcid.org/0000-0001-6518-3563
authors.initials: H
authors.lastname: Kim
authors.affiliation: School of Electrical and Electronic Engineering, Chung-Ang University , Seoul, Korea.
authors.forename: Sung Kyu
authors.initials: SK
authors.lastname: Park
authors.forename: Yong-Hoon
authors.identifier: http://orcid.org/0000-0003-0057-1893
authors.initials: YH
authors.lastname: Kim
mesh_terms: D000096:Acetone; D003920:Diabetes Mellitus; D006801:Humans; D053758:Nanoparticles; D012964:Sodium; D013696:Temperature; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D000096:Acetone; D012964:Sodium; D015034:Zinc Oxide
keywords: Na:ZnO; gas sensor; nanoflowers; p-type; room temperature