A backside fluorine-functionalized graphene layer for ammonia detection. Issue 1 (13th November 2014)

• Record Type: Journal Article
• Authors: Katkov, M. V.; Sysoev, V. I.; Gusel'nikov, A. V.; Asanov, I. P.; Bulusheva, L. G.; Okotrub, A. V.
• Is Part Of: Physical chemistry chemical physics. Volume 17:Issue 1(2015)
• Page Start: 444
• Page End: 450
• Publication Date: 2014-11-13
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c4cp03552f
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Sensing properties of the back-side fluorinated graphene to ammonia gas are significantly enhanced in comparison with pristine graphene. The NH3 –graphene interaction model based on the concentration dependence measurements is supported by quantum-chemical calculations. Abstract : Graphene is a remarkable material with the best surface to volume ratio as a result of its 2D nature, which implies that every atom can be considered as a surface one. These features make graphene attractive for use as a sensing material; however, the limiting factor is the chemical inertness of pristine graphene. Here we propose a method to create reactive centers by removal of fluorine atoms from the outer surface of fluorinated graphene while preserving the backside fluorination. Such partially recovered graphene layers were produced by the action of hydrazine-hydrate vapor on initially non-conducting fluorinated graphite. The reduction degree of the material and its electrical response revealed upon ammonia exposure were controlled by measuring the surface conductivity. We showed experimentally that the sensing properties depend on the reduction degree and found the correlation of the adsorption energy of ammonia with the number of residual fluorine atoms by the use of quantum-chemical calculations.