Cellulose nanofibril film as a piezoelectric sensor material
Rajala, Satu; Siponkoski, Tuomo; Sarlin, Essi; Mettänen, Marja; Vuoriluoto, Maija; Pammo, Arno; Juuti, Jari; Rojas, Orlando J.; Franssila, Sami; Tuukkanen, Sampo (2016-06-22)
Rajala, Satu
Siponkoski, Tuomo
Sarlin, Essi
Mettänen, Marja
Vuoriluoto, Maija
Pammo, Arno
Juuti, Jari
Rojas, Orlando J.
Franssila, Sami
Tuukkanen, Sampo
22.06.2016
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201703291239
https://urn.fi/URN:NBN:fi:tty-201703291239
Kuvaus
Peer reviewed
Tiivistelmä
Self-standing films (45-μm thick) of native cellulose nanofibrils (CNF) were synthesized and characterized for their piezoelectric response. The surface and the microstructure of the films were evaluated with image-based analysis and scanning electron microscopy (SEM). The measured dielectric properties of the films at 1 kHz and 9.97 GHz indicated a relative permittivity of 3.47 and 3.38 and loss tangent tan δ of 0.011 and 0.071, respectively. The films were used as functional sensing layers in piezoelectric sensors with corresponding sensitivities of 4.7 to 6.4 pC/N in ambient conditions. This piezoelectric response is expected to increase remarkably upon film polarization resulting from the alignment of the cellulose crystalline regions in the film. The CNF sensor characteristics were compared with those of polyvinylidene fluoride (PVDF) as reference piezoelectric polymer. Overall, the results suggest that CNF is a suitable precursor material for disposable piezoelectric sensors, actuator or energy generators with potential applications in the fields of electronics, sensors and biomedical diagnostics.
Kokoelmat
- TUNICRIS-julkaisut [18884]