Highly sensitive and selective trimethylamine sensor using one-dimensional ZnO-Cr2O3 hetero-nanostructures

Cited 164 time in webofscience Cited 0 time in scopus
  • Hit : 472
  • Download : 0
Highly selective and sensitive detection of trimethylamine (TMA) was achieved by the decoration of discrete p-type Cr2O3 nanoparticles on n-type ZnO nanowire (NW) networks. Semielliptical Cr2O3 nanoparticles with lateral widths of 3-8 nm were deposited on ZnO NWs by the thermal evaporation of CrCl2 at 630 degrees C, while a continuous Cr2O3 shell layer with a thickness of 30-40 nm was uniformly coated on ZnO NWs at 670 degrees C. The response (R-a/R-g: R-a, resistance in air; R-g, resistance in gas) to 5 ppm TMA of Cr2O3-decorated ZnO NWs was 17.8 at 400 degrees C, which was 2.4 times higher than that to 5 ppm C2H5OH and 4.3-8.4 times higher than those to 5 ppm p-xylene, NH3, benzene, C3H8, toluene, CO, and H-2. In contrast, both pristine ZnO and ZnO (core)-Cr2O3 (shell) nanocables (NCs) showed comparable responses to the different gases. The highly selective and sensitive detection of TMA that was achieved by the deposition of semielliptical Cr2O3 nanoparticles on ZnO NW networks was explained by the catalytic effect of Cr2O3 and the extension of the electron depletion layer via the formation of p-n junctions.
Publisher
IOP PUBLISHING LTD
Issue Date
2012-06
Language
English
Article Type
Article
Keywords

FILM GAS SENSOR; SENSING PROPERTIES; ROOM-TEMPERATURE; CONDUCTION MECHANISM; OXIDE NANOSTRUCTURES; ZINC-OXIDE; TIN OXIDE; FRESHNESS; METAL; CHEMIRESISTORS

Citation

NANOTECHNOLOGY, v.23, no.24

ISSN
0957-4484
DOI
10.1088/0957-4484/23/24/245501
URI
http://hdl.handle.net/10203/102354
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 164 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0