Controlled selectivity of polysiloxane coatings: Their use in capacitance sensors

A sensor array based on mass and capacitance transducers for the detection of adulterated gasolines

“…In the case of polymer coatings polymer swelling is likely the dominant effect [6] and then Table 1. compounds such as hydrocarbons, for which sorption interactions are dominant, can efficiently be detected by this kind of sensors.…”

“…Sensing mechanism is based in case of physisorption on the polarization of the adsorbed molecule and when chemisorption takes place on the change on the polarization of the sensing molecule and adsorbed molecule complex. In the case of polymer-coated sensors the change of dielectric constant is less important and the effect of thickness change due to polymer swelling becomes dominant [6].…”

Polymer films in sensor applications: a review of present uses and future possibilities

“…Permittivity changes may also be detected in a lot of polymeric materials, due to the absorption of molecules with high dipole moments [5], or to the swelling [6], even when sorbing non-polar molecules. Swelling is a pure geometrical effect which can be detected by capacitance changes [6].…”

“…Swelling is a pure geometrical effect which can be detected by capacitance changes [6]. Polyimides are widely used in humidity sensors [5], and heteropolysiloxanes with various organic side-chains can be sensitised for different gas components [6].…”

Desenvolvimento de novos materiais para a detecção de pesticidas

“…Para os vários tipos de sensores fabricados com polímeros, pode ser observada as mais diversas aplicações, como por exemplo sensores de temperatura [94][95][96][97] , sensores mecânicos (de pressão, de aceleração, de vibração, de deformação, etc.) 98,99 , sensores de radiação [100][101][102][103][104] , sensores de humidade [105][106][107][108][109][110][111][112][113] , sensores de gás [114][115][116][117][118][119][120][121][122][123] , biossensores [124][125][126][127][128] , sensores seletivos a íons [129][130][131][132] , e outros tipos, tais como sensores para componentes líquidos .…”