C₂H₅OH Sensor Using Porous Cr₂O₃Nano-Hexaprisms

Abstract

Dense Cr-precursor nano-hexaprisms were prepared by heating the Cr-nitrate aqueous solution containing Hexamethylenetetramine and polyvinylpyrrolidone, which were converted into porous Cr 2 O 3 nano-hexaprisms containing nanoparticles by heat treatment of Crprecursors at 600… for 2 h in air atmosphere. At the sensor temperature of 300…, porous Cr 2 O 3 nano-hexaprism showed the high response (R g /R a , R g : resistance in gas, R a : resistance in air) to 100 ppm C 2 H 5 OH (R g /R a =69.8) with negligible cross-responses to 100 ppm CO and 5 ppm C 6 H 6 . The sensitive and selective detection of C 2 H 5 OH in porous Cr 2 O 3 nano-hexaprism were discussed in relation to the morphology of nanostructures. Received : Sep. 4. 2012, Revised : Nov. 21, 2012, Accepted : Nov. 21, 2012 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/bync/3.0)which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.