지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 김갑진
- 발행연도
- 2015
- 저작권
- 경희대학교 논문은 저작권에 의해 보호받습니다.
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초록· 키워드
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Since the last decade, many research groups have reported the piezoelectric characteristics of PLA films. When a shear strain is applied to helical PLA molecules in the direction of its chain axis, a piezoelectric current called as “shear piezoelectricity” is generated. Piezoelectricity in PLA is understood to originate from its molecular helical structure aided by the transformation of 103 helical conformation (α-crystalline form) to the 31 helical conformation (β-crystalline form) upon drawing the PLA film.
The present study focused on the comparative piezoelectric properties of both PVDF and PLA film based sensors using physiological sensing belt (PSB) to measure human breathing pattern. The piezoelectric signals from PVDF and PLA film sensors were compared with that obtained using PLA nanofiber web depending on the circumference change of PSB by expansion ? contraction of the chest. In addition to that, PLA nanofiber web was fabricated via electrospinning to overcome the inherent brittleness and non-flexible nature of the PLA film. To increase the piezoelectric current of electrospun PLA nanofiber web, multi-layered nanofiber web sensor with 3, 5, and 8 layers were fabricated and their output currents were measured.
Finally, the most effective signal enhanced sensor was used as a power source to charge capacitor as well as to operate LEDs, which is the significance of the present study and has great potential for many commercial applications.
The present study focused on the comparative piezoelectric properties of both PVDF and PLA film based sensors using physiological sensing belt (PSB) to measure human breathing pattern. The piezoelectric signals from PVDF and PLA film sensors were compared with that obtained using PLA nanofiber web depending on the circumference change of PSB by expansion ? contraction of the chest. In addition to that, PLA nanofiber web was fabricated via electrospinning to overcome the inherent brittleness and non-flexible nature of the PLA film. To increase the piezoelectric current of electrospun PLA nanofiber web, multi-layered nanofiber web sensor with 3, 5, and 8 layers were fabricated and their output currents were measured.
Finally, the most effective signal enhanced sensor was used as a power source to charge capacitor as well as to operate LEDs, which is the significance of the present study and has great potential for many commercial applications.
목차
1. Introduction 11.1 Piezoelectric properties of PLA drawn film 11.1.1 Shear piezoelectricity of PLA 31.1.2 Physiological Sensing Belt (PSB) sensor 51.2 Piezoelectric properties of PLA nanofiber web 71.2.1 Electrospinning effect 71.2.2 Piezoelectric sensors based on electrospun PLA nanofiber web 71.3 Objectives 92. Experimental 102.1 Materials 102.2 Manufacturing process of PLA 102.2.1 Uniaxially drawn film 102.2.2 Electrospun nanofiber web 132.3 Fabrication of sensors 152.3.1 PSB sensor 152.3.2 Piezoelectric sensor 183. Characterization 203.1 Field emission-scanning electron microscopy (FE-SEM) 203.2 Attenuated total reflectance infrared (ATR-IR) spectroscopy 203.3 PSB signal measurement 203.4 Piezoelectricity measurement 213.5 Circuit design and measurement 214. Results and Discussion 244.1 PSB sensor signals 244.1.1 ATR-IR spectroscopy 244.1.2 Dynamic pressure signals 264.1.3 PSB sensor signals 304.2 Piezoelectric sensors based on electrospun PLA nanofiber web 324.2.1 FE-SEM studies 324.2.2 Dynamic pressure signals 324.3 Circuit applications 424.3.1 Capacitor charge 424.3.2 LED light source 425. Conclusions 466. References 48
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