Understanding the ammonia sensing behavior of filter coffee powder derived N-doped carbon nanoparticles using the Freundlich-like isotherm

Sadhanala, HK and Nandan, R and Nanda, KK (2016) Understanding the ammonia sensing behavior of filter coffee powder derived N-doped carbon nanoparticles using the Freundlich-like isotherm. In: JOURNAL OF MATERIALS CHEMISTRY A, 4 (22). pp. 8860-8865.

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Abstract

We report the synthesis of nitrogen-doped carbon nanoparticles (N-CNPs) with different nitrogen at% from coffee powder as a single precursor (that serves as both carbon and nitrogen sources) using a hydrothermal route and the ammonia sensing with N-CNPs as a chemiresistive material. We show that ammonia sensing is possible at room temperature for which the presence of oxygen is essential and the sensing mechanism is similar to that for semiconductor oxides. We also show improved performance in terms of the range of detection, sensitivity and response time with N at%. Furthermore, it has been shown that the dependency of sensitivity on ammonia concentration can be expressed by the Freundlich equation. Interestingly, the sensitivity and Freundlich constant (adsorption capacity) show similar exponential enhancement which advocates the improvement in the low detection limit with N at% as observed experimentally. Finally, the Freundlich exponent (adsorption intensification) is shown to increase linearly with N at%.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS CHEMISTRY A
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	19 Aug 2016 09:49
Last Modified:	19 Aug 2016 09:49
URI:	http://eprints.iisc.ac.in/id/eprint/54328

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