Open AccessCarbon dioxide resistive sensor based on titanium oxide nanowires doped with potassium
Author(s) -
Lee Inhee
Publication year - 2014
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2013.0718
Subject(s) - nanowire , materials science , fabrication , titanium dioxide , doping , nanotechnology , titanium , vapor–liquid–solid method , oxide , titanium oxide , chemical engineering , optoelectronics , composite material , metallurgy , medicine , alternative medicine , pathology , engineering
Potassium‐doped titanium oxide (TiO 2 ) nanowires are fabricated by the moisture‐assisted, direct oxidation of a thin film of titanium at 650°C. The influence of the fabrication conditions on the structure and morphology of the nanowires was investigated. It was shown that the presence of potassium (K) is necessary for the formation of the nanowires. The density of growth of the nanowires was high, and the lengths of the nanowires were tens of micrometres. The K‐doped TiO 2 nanowires showed the possibility of use as a sensing material because of their significant and consistent response to responding to carbon dioxide (CO 2 ) gas. In addition, H 2 plasma treatment improved the sensitivity of the CO 2 gas sensor made of K‐doped TiO 2 nanowires. Although the sensing mechanism is not clear, this development suggests opportunities for the fabrication of simple and inexpensive CO 2 microsensors with low power consumption.