Increased sensor sensitivities obtained by polymer-coated quartz microbalances

Autor:	Dieter Schmeißer, R Oehmgen, Günter Appel, P Hausmann, A Oprea, Karsten Henkel, H Lauer
Rok vydání:	1999
Předmět:	Detection limit chemistry.chemical_classification Materials science Analytical chemistry Bioengineering Polymer Chemical reaction Biomaterials Solvent chemistry Mechanics of Materials Desorption Absorption (chemistry) Porosity Quartz
Zdroj:	Materials Science and Engineering: C. :509-512
ISSN:	0928-4931
DOI:	10.1016/s0928-4931(99)00065-x
Popis:	Polymer-coated quartz microbalances were produced and studied. They exhibited high sensitivities for heavy noncyclical hydrocarbons and CO 2 concentration measurements. Detection limit of 1 ppm CO 2 and 10 ppm Shellsol (Shell solvent containing: 28.7% C 10 H 22 ; 66.4% C 11 H 24 ; 5% C 12 H 26 ) are obtained and reported. The time constants of the absorption and desorption processes were investigated also. A diffusion-free behaviour was observed and related to the porosity of the layer. Collateral AFM (atomic force microscopy) analysis of the polymer structure was performed. We explain big values of the absorption–desorption time constant for CO 2 and small values for C n H 2 n +2 mixtures in connection with the peculiarities of the chemical reaction involved by the sensing mechanisms.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c0883b3d044c4c8bd1f2aa3497d0cccf https://doi.org/10.1016/s0928-4931(99)00065-x Zobrazit plný text záznamu Full Text from ScienceDirect