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Graphene/poly(methyl methacrylate) chemiresistor sensor for formaldehyde odor sensing.

Journal of hazardous materials (2013-02-19)
Taher Alizadeh, Leyla Hamed Soltani
ABSTRACT

It was demonstrated that a thin film of chemically exfoliated graphene flakes, blended with poly(methyl methacrylate), could be used as a chemiresistor sensor for the sensitive and selective determination of formaldehyde vapor. Formaldehyde adsorption on the sensing film led to an increase in the electrical resistance of the sensing film. It was demonstrated that direct interaction of formaldehyde with graphene flakes was responsible for the observed response. Graphene/polymer ratio was found to be important parameter in defining the dominant sensing mechanism and sensor performance. A reasonable relationship was found between formaldehyde concentration and electrical resistance response of the sensor. The amounts of graphene and polymer in the sensing composite were optimized by using three-level full factorial design in order to acquire higher sensitivity and selectivity. Final sensor response for formaldehyde concentration was linear between 0.05 and 5.0 ppm. The detection limit of this sensing device was calculated equal to 10 ppb.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Poly(methyl methacrylate), isotactic, >80% isotactic
Sigma-Aldrich
Poly(methyl methacrylate), average Mw ~15,000 by GPC, powder
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, average Mw 97,000 (Typical), average Mn 46,000 (Typical)
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 2,480,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 8,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 50,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 10,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 2,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 20,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 100,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 4,000
Sigma-Aldrich
Poly(methyl methacrylate), average Mw ~350,000 by GPC
Sigma-Aldrich
Poly(methyl methacrylate)
Sigma-Aldrich
Poly(methyl methacrylate)