Cellulose Electroactive Paper (EAPap): The potential for a novel electronic material
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1129-V05-02
Cellulose Electroactive Paper (EAPap): The potential for a novel electronic material Joo-Hyung Kim*, Kwangsun Kang, Sungryul Yun, Sangyeul Yang, Min-Hee Lee, Jung-Hwan Kim and Jaehwan Kim Creative Research Center for Electroactive Paper (EAPap) Actuator, Dept. of Mechanical Engineering, INHA University Young-Hyun Dong 253, Nam Gu, Incheon, South Korea
ABSTRACT Cellulose electro-active paper (EAPap) has attracted much attention as a new smart electronic material to be utilized as mechanical sensors, bio compatible applications and wireless communications. The thin EAPap film has many advantages such as lightweight, flexible, dryness, biodegradable, easy to chemically modify, cheap and abundance. Also EAPap film has a good reversibility for mechanical performance, such as bending movement, under electric field. The main actuation mechanism governed by piezoelectric property can be modulated by material direction and stretching ratio during process. In this paper we present the overview as well as fabrication process of cellulose EAPap as a novel smart material. Also we propose the method to enhance the piezoelectricity, its mechanical and electromechanical properties. In addition, the fabrication of high quality metal patterns with Schottky diode on the cellulose surface is an initiating stage for the integration of the EAPap actuator and electronic components. The integration of flexible actuator and electronic elements has huge potential application including flying magic carpets, microwave driven flying insets and micro-robots and smart wall papers.
INTRODUCTION Recently, cellulose has a spotlight as a new smart material. It has been discovered that cellulose materials have many attractive properties such as large deformation, light weight, inexpensive fracture tolerance. A cellulose based Electroactive Paper (EAPap) film has been investigated as an attractive smart material due to its characteristics of lightweight, biodegradable, low cost, large bending displacement, low power consumption and piezoelectricity.1,2 It consists of β-D-glucopyraonosyl units with a (1– 4)-β-D-linkage and forms a linear chain through many inter- and intramolecular hydrogen bonding. The linearity of cellulose makes it easy for the molecules to produce parallel arrays and cause a high degree of crystallinity. It was reported the maximum tip displacement of 4.3 mm out of 40 mm long beam was occurred under 0.25 MV/µm of electric field and the electric power consumption of EAPap actuator was 10 mW/cm2 when an electric field is applied across the thickness direction of the EAPap films. The
main actuating performance depends on the combined effects of piezoelectricity and ion migration associated with dipole. Cellulose itself has a hydrophilic property due to its –OH to make a weak hydrogen bond with water in environment. Therefore, as a sensor, cellulose EAPap film is an interesting flexible electrical substrate due to high electrical sensitivity according to changes of relative humidity and/or temperature in living conditio
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