Jp. Lukaszewicz et Ap. Terzyk, POROSITY OF CARBON-FILMS APPLIED TO CHEMICAL SENSOR CONSTRUCTION, Colloids and surfaces. A, Physicochemical and engineering aspects, 132(2-3), 1998, pp. 127-135
Investigations on the basic properties of carbons applicable to the co
nstruction of semiconducting gas sensors are presented. Development of
pore structure of such carbons is considered as the function of carbo
nisation temperature and chemical modification of the carbons. The che
mical modification consisted in the premixing of furfuryl alcohol with
an aqueous solution of sodium acetate. The carbons tested were prepar
ed by simulating the ''spry pyrolysis'' technique. The Na-modification
resulted in an increase of the W-o value (the Dubinin-Radushkevich ad
sorption model) of the carbon films upon increasing the carbonisation
temperature while the average pore diameter L was constant. The pore s
tructure in the case of Na-modified carbons was the result of Na2CO3 m
icrocrystallite formation (from CH3COONa) inside the carbon skeleton a
nd their subsequent reaction with the carbon matrix. (C) 1998 Elsevier
Science B.V.