In:
Nano, World Scientific Pub Co Pte Ltd, Vol. 06, No. 05 ( 2011-10), p. 455-460
Abstract:
TeO 2 nanorods functionalized with Pd were prepared by a three-step process comprising thermal evaporation of Te powders, Pd deposition by photo-reduction, and annealing. Sensors were fabricated by using the Pd -functionalized TeO 2 nanorods. Scanning electron microscopy images exhibited that the nanorods with diameters in a range of 50–100 nm and lengths of a few micrometers were covered with the Pd nanoparticles with an average diameter of ~ 15 nm. Transmission electron microscopy and X-ray diffraction analysis revealed that the nanorods were monocrystalline simple tetragonal TeO 2 . On the other hand, the nanoparticles on them were confirmed to be nanocrystalline face-centered cubic Pd . The multiple-networked TeO 2 nanorod sensors exhibited a sensitivity of 3.13% at 100 ppm NO 2 at 300°C, whereas the Pd -functionalized TeO 2 nanorod sensors exhibited a sensitivity of 11.97% under the same condition. The recovery time of TeO 2 nanorods was decreased considerably at every NO 2 concentration by the Pd -functionalization even if the response time decreased or increased slightly depending upon the NO 2 concentration. In addition, the origin of the enhancement of the sensing properties of the TeO 2 nanorods by functionalization with Pd is discussed.
Type of Medium:
Online Resource
ISSN:
1793-2920
,
1793-7094
DOI:
10.1142/S1793292011002858
Language:
English
Publisher:
World Scientific Pub Co Pte Ltd
Publication Date:
2011
