Display options
Cite
Alizadeh T, Ahmadian F. Thiourea-treated graphene aerogel as a highly selective gas sensor for sensing of trace level of ammonia. Anal Chim Acta. 2015;897:87-95doi: 10.1016/j.aca.2015.09.031.
Alizadeh, T., & Ahmadian, F. (2015). Thiourea-treated graphene aerogel as a highly selective gas sensor for sensing of trace level of ammonia. Analytica chimica acta, 89787-95. https://doi.org/10.1016/j.aca.2015.09.031
Alizadeh, Taher, and Ahmadian, Farzaneh. "Thiourea-treated graphene aerogel as a highly selective gas sensor for sensing of trace level of ammonia." Analytica chimica acta vol. 897 (2015): 87-95. doi: https://doi.org/10.1016/j.aca.2015.09.031
Alizadeh T, Ahmadian F. Thiourea-treated graphene aerogel as a highly selective gas sensor for sensing of trace level of ammonia. Anal Chim Acta. 2015 Oct 15;897:87-95. doi: 10.1016/j.aca.2015.09.031. Epub 2015 Sep 21. PMID: 26515009.
Copy Download .nbib Format: NLM
Share it on

Anal Chim Acta. 2015 Oct 15;897:87-95. doi: 10.1016/j.aca.2015.09.031. Epub 2015 Sep 21.

Thiourea-treated graphene aerogel as a highly selective gas sensor for sensing of trace level of ammonia.

Analytica chimica acta

Taher Alizadeh, Farzaneh Ahmadian

Affiliations

  1. Department of Analytical Chemistry, Faculty of Chemistry, University College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran. Electronic address: [email protected].
  2. Department of Applied Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Daneshgah Street, P.B179, 56199-11367 Ardabil, Iran.

PMID: 26515009 DOI: 10.1016/j.aca.2015.09.031

Abstract

As a result of this study, a new and simple method was proposed for the fabrication of an ultra sensitive, robust and reversible ammonia gas sensor. The sensing mechanism was based upon the change in electrical resistance of a graphene aerogel as a result of sensor exposing to ammonia. Three-dimensional graphene hydrogel was first synthesized via hydrothermal method in the absence or presence of various amounts of thiourea. The obtained material was heated to obtain aerogel and then it was used as ammonia gas sensor. The materials obtained were characterized using different techniques such as Fourier transform infra red spectroscopy (FT-IR), thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The thiourea-treated graphene aerogel was more porous (389 m(2) g(-1)) and thermally unstable and exhibited higher sensitivity, shorter response time and better selectivity toward ammonia gas, compared to the aerogel produced in the absence of thiourea. Thiourea amount, involved in the hydrogel synthesis step, was found to be highly effective factor in the sensing properties of finally obtained aerogel. The sensor response time to ammonia was short (100 s) and completely reversible (recovery time of about 500 s) in ambient temperature. The sensor response to ammonia was linear between 0.02 and 85 ppm and its detection limit was found to be 10 ppb (3S/N).

Copyright © 2015 Elsevier B.V. All rights reserved.

Keywords: Aerogel; Ammonia; Gas sensor; Graphene; Hydrogel

Publication Types