Nanocellulose based piezoelectric sensors
Research output: Other conference contribution › Paper, poster or abstract › Scientific
|Number of pages||2|
|Publication status||Published - 18 May 2016|
|Event||Micronano System Workshop 2016 - University of Lund, Lund, Sweden|
Duration: 17 May 2016 → 18 May 2016
|Conference||Micronano System Workshop 2016|
|Period||17/05/16 → 18/05/16|
We report the experimental results on piezoelectricity of nanocellulose films. The piezoelectric sensor elements were prepared usign a nanocellulose film as a sensing layer. The piezoelectric sensitivity values from 2-7 pC/N were obtained for the prepared sensor elements.
KEYWORDS: Nanocellulose, piezoelectric sensor, cellulose nanofibrils, polyvinylidenefluoride
Cellulose based nanomaterials, generally known as nanocellulose , are interesting renewable bio-based nanomaterials which have potential applications in material sciences, electronics and biomedical engineering and diagnostic. The piezoelectricity of wood initiates from the highly crystalline assemblies of cellulose chains . Experimental evidence of the piezoelectricity of cellulose nanocrystals (CNC) was reported only very recently [3,4]. Cellulose nanofibrils (CNF), produced by a mechanical homogenizing process from cellulose fibers, contain both crystalline and amorphous regions (see Figure 1). CNC can be made from CNF by removal of amorphous regions using hydrolysis.
The piezoelectric sensitivity of prepared sensor elements is measured using in-house built measurement setup equipped with a mechanical shaker and charge amplifier (See Figure 2). The setup is described elsewhere in details .
RESULTS AND DISCUSSION
A randomly oriented CNF film (prepared by pressure filtering from aqueous CNF dispersion) showed piezoelectric sensitivities of 2-7 pC/N [6,7]. The values align between the piezoelectric coefficients of quartz (2.3 pC/N) and polyvinylidenefluoride (PVDF, -30 pC/N).
In this work, we have successfully demonstrated the fabrication of piezoelectric sensors using nanocellulose as a sensing material. Based on these findings, nanocellulose seems a promising material for sensors and energy harvesting applications.
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