Issue 60, 2014

Facile synthesis of pseudo-peanut shaped hematite iron oxide nano-particles and their promising ethanol and formaldehyde sensing characteristics

Abstract

Herein, pseudo-peanut shaped hematite iron oxide nano-particles are prepared through a facile cost effective wet chemical synthesis route. The synthesized particles are characterized in terms of their phase formation behavior, morphological features and also used for sensing ethanol and formaldehyde vapors. The sensing characteristics (response %, response time, recovery time, selectivity coefficient) are investigated by varying the operating temperature (300–375 °C) of the sensor and concentration (20–200 ppm) of the studied vapors. The sensor shows promising response towards ethanol and formaldehyde vapors. In the studied operating temperature range, the response of the sensor towards ethanol is found to be better than formaldehyde. The cross-selectivity issue of the sensor has been addressed using the variation of selectivity coefficient with the exposure time of the vapors. For sensing ethanol and formaldehyde vapors, the response of the pseudo-peanut shaped particles is compared with poly-disperse type hematite particles. As compared to the poly-disperse particles, peanut like structures are found to be superior for sensing the studied vapors.

Graphical abstract: Facile synthesis of pseudo-peanut shaped hematite iron oxide nano-particles and their promising ethanol and formaldehyde sensing characteristics

Article information

Article type
Paper
Submitted
07 Apr 2014
Accepted
07 Jul 2014
First published
08 Jul 2014

RSC Adv., 2014,4, 31879-31886

Author version available

Facile synthesis of pseudo-peanut shaped hematite iron oxide nano-particles and their promising ethanol and formaldehyde sensing characteristics

P. Das, B. Mondal and K. Mukherjee, RSC Adv., 2014, 4, 31879 DOI: 10.1039/C4RA03098B

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