Sungryul Yun et al 2009 Smart Mater. Struct. 18 117001 doi:10.1088/0964-1726/18/11/117001
Sungryul Yun, Sangdong Jang, Gyu-Young Yun and Jaehwan Kim1
Show affiliationsElectrically aligned regenerated cellulose films were fabricated and the effect of applied electric field was investigated for the piezoelectricity of electro-active paper (EAPap). The EAPap was fabricated by coating gold electrodes on both sides of regenerated cellulose film. The cellulose film was prepared by dissolving cotton pulp in LiCl/N,N-dimethylacetamide solution followed by a cellulose chain regeneration process. During the regeneration process an external electric field was applied in the direction of mechanical stretching. Alignment of cellulose fiber chains was investigated as a function of applied electric field. The material characteristics of the cellulose films were analyzed by using an x-ray diffractometer, a field emission scanning electron microscope and a high voltage electron microscope. The application of external electric fields was found to induce formation of nanofibers in the cellulose, resulting in an increase in the crystallinity index (CI) values. It was also found that samples with higher CI values showed higher in-plane piezoelectric constant, d31, values. The piezoelectricity of the current EAPap films was measured to be equivalent or better than that of ordinary PVDF films. Therefore, an external electric field applied to a cellulose film along with a mechanical stretching during the regeneration process can enhance the piezoelectricity.
68.55.A- Nucleation and growth
77.65.Bn Piezoelectric and electrostrictive constants
81.07.-b Nanoscale materials and structures: fabrication and characterization
Condensed matter: electrical, magnetic and optical
Surfaces, interfaces and thin films
Issue 11 (November 2009)
Received 19 January 2009, in final form 3 August 2009
Published 11 September 2009
Sungryul Yun et al 2009 Smart Mater. Struct. 18 117001
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