Title :
Development of a biosensor based on a piezoelectric film
Author :
Inácio, P. ; Mendes, J. N Marat ; Dias, C.J.
Author_Institution :
Dep. de Ciencias dos Materiais, Seccao de Materiais Electroactivos (CENIMAT), Caparica, Portugal
Abstract :
Most gravimetric biosensors use thin piezoelectric quartz crystals (quartz crystal microbalance, QCM), either as resonating crystals, or as bulk/surface acoustic wave (SAW) devices. A system is described in which acoustic waves are launched in very thin (25 microns) polymer films to produce an oscillatory resonant device. A theoretical equation for this system is almost equal to the Sauerbrey equation used in the QCM method. A system using a PVDF film was tested in protein detection. Results showed that the PVDF film can act has a microbalance. Currently, a new system using a PVDF/Immobilon-P/PVDF film, to be used in protein detection, is being tested. Results for the PVDF system and current work with the new system are presented.
Keywords :
biosensors; microbalances; piezoelectric thin films; piezoelectric transducers; polymer films; proteins; Immobilon-P membrane; PVDF film; Sauerbrey equation; acoustic wave device; gravimetric biosensor; microbalance; oscillatory resonant device; piezoelectric film; polymer film; protein detection; Acoustic waves; Biosensors; Crystals; Equations; Piezoelectric devices; Piezoelectric films; Proteins; Surface acoustic wave devices; Surface acoustic waves; System testing;
Conference_Titel :
Electrets, 2002. ISE 11. Proceedings. 11th International Symposium on
Print_ISBN :
0-7803-7560-2
DOI :
10.1109/ISE.2002.1042999
