title: A sub-ppm acetone gas sensor for diabetes detection using 10 nm thick ultrathin InN FETs.
abstract: An indium nitride (InN) gas sensor of 10 nm in thickness has achieved detection limit of 0.4 ppm acetone. The sensor has a size of 1 mm by 2.5 mm, while its sensing area is 0.25 mm by 2 mm. Detection of such a low acetone concentration in exhaled breath could enable early diagnosis of diabetes for portable physiological applications. The ultrathin InN epilayer extensively enhances sensing sensitivity due to its strong electron accumulation on roughly 5-10 nm deep layers from the surface. Platinum as catalyst can increase output current signals by 2.5-fold (94 vs. 37.5 μA) as well as reduce response time by 8.4-fold (150 vs. 1,260 s) in comparison with bare InN. More, the effect of 3% oxygen consumption due to breath inhalation and exhalation on 2.4 ppm acetone gas detection was investigated, indicating that such an acetone concentration can be analyzed in air.
authors.affiliation: Institute of NanoEngineering and MicroSystems, National Tsing Hua University, Hsinchu 30013, Taiwan. s9835812@m98.nthu.edu.tw
authors.forename: Kun-Wei
authors.initials: KW
authors.lastname: Kao
authors.forename: Ming-Che
authors.initials: MC
authors.lastname: Hsu
authors.forename: Yuh-Hwa
authors.initials: YH
authors.lastname: Chang
authors.forename: Shangjr
authors.initials: S
authors.lastname: Gwo
authors.forename: J Andrew
authors.initials: JA
authors.lastname: Yeh
mesh_terms: D000096:Acetone / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation*; D003920:Diabetes Mellitus / Q000175:diagnosis*; D004560:Electricity; D005740:Gases / Q000032:analysis*; D006801:Humans; D007204:Indium; D010100:Oxygen / Q000737:chemistry; D010984:Platinum / Q000737:chemistry; D014173:Transistors, Electronic
chemical_list: D005740:Gases; D007204:Indium; D000096:Acetone; D010984:Platinum; C513701:indium nitride; D010100:Oxygen