Ultrahigh CO Sensing Capability of Au-Doped TiO2 Porous Nanoceramics
Pure and Au-doped TiO2 ceramic bulks have been prepared from TiO2 nanoparticles through traditional pressing and sintering. For those samples sintered at 550 °C, nitrogen adsorption–desorption isotherms measured at 77 K revealed a highly porous microstructure
with a Brunauer-Emmett-Teller (BET) specific surface area of 30 m2/g, which has also been confirmed through microscopic analyses. CO sensors have been further fabricated from those bulks through coating Pt electrodes on their surfaces. While sensors based-on undoped TiO2
nanoceramics show a sensitivity of 20 for 700 ppm CO in N2 at 300 °C, those based-on Au-doped TiO2 nanoceramics are able to show sensitivities as high as ∼104, highlighting the crucial role of Au-doping in elevating CO sensitivity. The mechanism for
such ultrahigh sensitivities has been discussed, in which much attention has been paid to the absence of glass frit as commonly used in commercial thick-film gas sensors.
Keywords: Porous Nanoceramics; Sensor Response; Sintering; TiO2
Document Type: Research Article
Affiliations: 1: Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China 2: Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China 3: State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China 4: Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hong Kong, China
Publication date: 01 September 2016
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
- Editorial Board
- Information for Authors
- Subscribe to this Title
- Terms & Conditions
- Ingenta Connect is not responsible for the content or availability of external websites
- Access Key
- Free content
- Partial Free content
- New content
- Open access content
- Partial Open access content
- Subscribed content
- Partial Subscribed content
- Free trial content