Resistive-type humidity sensors based on PVP–Co and PVP–I2 complexes

• Autores: De Queiroz, Angel A.A.; Soares, Demetrio A.W.; Tresniack, P.; Abraham, Gustavo Abel
• Año de publicación: 2001
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Poly(Vinylpyrrolidone); Charge Transfer Complexes; Electrical Properties; Humidity Sensors; Polymeric Electret Behavior
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Poly(vinylpyrrolidone) films containing cobalt chloride or iodine were investigated to obtain information on their possible use as a humidity sensor element. FTIR and UV-VIS spectroscopies were used to characterize the PVP–I2 and PVP–Co complexes. Infrared spectroscopy revealed a structural change of both shape and intensity of the carbonyl and lactam bands, indicating the formation of an ion-coordination polymer. The J–E curves for pure PVP, PVP–I2, and PVP–Co films obey ohm's law at low voltages, deviate from the linear response at higher voltages, and finally display breakdown behavior. An increase in current density of the PVP matrix with iodine or cobalt doping is attributed to the formation of charge transfer complexes. The observed hysteresis of the I–V characteristics implies that there was some standing voltage in the film, which could be attributed to a disorientation of polar side groups of PVP. The electrical conductivities of the polymeric complexes were very sensitive to environmental humidity. An explanation of the humidity-sensing behavior of the PVP–I2 and PVP–Co complexes is presented.
Fil: De Queiroz, Angel A.A.. Universidade Federal Itajuba; Brasil
Fil: Soares, Demetrio A.W.. Universidade Federal Itajuba; Brasil
Fil: Tresniack, P.. Universidade Federal Itajuba; Brasil
Fil: Abraham, Gustavo Abel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina