• Title, Summary, Keyword: P(VDF-TrFE)

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Fabrication and characteristics PbTiO3/P(VDF/TrFE) thin films for pyroelectric infrared sensor (초전형 적외선 센서용 PbTiO3/P(VDF/TrFE) 박막의 제조 및 특성)

  • Kwon, Sung-Yeol
    • Journal of Sensor Science and Technology
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    • v.12 no.1
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    • pp.10-15
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    • 2003
  • $PbTiO_3$/P(VDF/TrFE) thin film for pyroelectric infrared sensor's sensing materials have been fabricated by spin coating technique. 65 wt% VDF and 35 wt% TrFE were for P(VDF/TrFE) powder. $PbTiO_3$ powder was used for a ceramic - polymer composites materials. Surface of composite thin film by ceramic fraction factor was observed by SEM. The $PbTiO_3$/P(VDF/TrFE) thin film capacitancy, dielectric constant and dielectric loss measured by impedence analyzer(HP4192A) and pyroelectric coefficient was measured by semiconductor parameter analyzer(HP4145B).

Improved Pyroelectric Characteristics of 0~3 $PbTiO_3$/P(VDF/TrFE) Composites Films for Infrared Sensing (적외선 감지를 위한 0~3 $PbTiO_3$/P(VDF/TrFE) 복합체 필름의 향상된 초전 특성)

  • Kwon, Sung-Yeol
    • Polymer(Korea)
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    • v.35 no.5
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    • pp.375-377
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    • 2011
  • $PbTiO_3$/P(VDF/TrFE) 0~3 composites thin films with 0.10 and 0.13 of ceramic volume fraction factor have been fabricated by two-step spin coating technique and analyzed. 0~3 connectivity of $PbTiO_3$/P(VDF/TrFE) composites film was observed successfully by SEM micrography. The SEM picture confirmed 0~3 connectivity. And, in all the properties, 0~3 $PbTiO_3$/P(VDF/TrFE) composites film was superior to P(VDF/TrFE) copolymer. Therefore, with a good low-dielectric constant and a high pyroelectric coefficient, the composite thin films can be used for a new pyroelectric infrared sensor of higher performance.

Effect of P(VDF/TrFE) Film Thickness on the Characteristics of Pyroelectric Passive Infrared Ray Sensor for Human Body Detection (P(VDF/TrFE) 필름의 두께에 따른 인체 감지형 초전형 PIR 적외선 센서의 특성)

  • Kwon, Sung-Yeol
    • Journal of Sensor Science and Technology
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    • v.20 no.2
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    • pp.114-117
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    • 2011
  • A thick 25 ${\mu}m$ thickness poled P(VDF/TrFE) film pyroelectric infrared ray sensor has been fabricated and then thin 1.6 ${\mu}m$ thickness P(VDF/TrFE) film pyroelectric infrared ray sensor has been fabricated also. These thick and thin P(VDF/TrFE) film pyroelectric infrared ray sensor was mounted in TO-5 housing to detect infrared light of 5.5 ~ 14 ${\mu}m$ wavelength for human body detecting with each other. The noise output voltage of the thick P(VDF/TrFE) film pyroelectric infrared ray sensor were 380 mV and NEP(noise equivalent power) is $3.95{\times}10^{-7}$ W which is the similar value with the commercial pyroelectric infrared ray sensor using ceramic materials as a sensing material. The NEP and specific detectivity $D^*$ of the thin P(VDF/TrFE) film pyroelectric infrared ray sensor were $2.13{\times}10^{-8}$ W and $9.37{\times}106$ cm/W under emission energy of 13 ${\mu}W/cm^2$ respectively. These result caused by lower thermal diffusion coefficient of a thin 1.6 ${\mu}m$ thickness PVDF/TrFE film than the thick 25 ${\mu}m$ thickness poled P(VDF/TrFE) film pyroelectric infrared ray sensor.

Dielectric characteristics with poling of P(VDF/TrFE) films for pyroelectric infrared sensor (초전형 적외선 센서용 P(VDF/TrFE) 막의 분극에 따른 유전특성의 변화)

  • Kwon, Sung-Yeol;Kim, Young-Woo;Baem, Seung-Choon;Park, Sung-Kun;Kim, Ki-Wan
    • Journal of Sensor Science and Technology
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    • v.9 no.1
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    • pp.9-14
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    • 2000
  • Dielectric characteristics of P(VDF/TrFE) film manufactured using spin coating technique have been investigated. To improve the crystallinity and quality of film, the film was three step annealed. Simple etching process and conditions for P(VDF/TrFE) film were established using top electrode as a mask. Poling is performed by several steps. $1.87\;{\mu}m$ thick P(VDF/TrFE) films were obtained with conditions such that the solution of 10 wt% concentration was spun at 3000rpm for 30 seconds. Before poling, dielectric constant and dielectric loss of P(VDF/TrFE) film were 13.5 and 0.042, respectively. After poling, dielectric constant and dielectric loss of P(VDF/TrFE) film were 11.5 and 0.037, respectively.

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Basic Study on P(VDF-TrFE) Smart Sensor for Monitoring Composite Structure Behaviors (복합재료구조물 거동 관찰을 위한 P(VDF-TrFE) 스마트센서의 기초연구)

  • Bae, Ji-Hun;Chang, Seung-Hwan
    • Composites Research
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    • v.28 no.3
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    • pp.75-80
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    • 2015
  • Poly(vinylidene fluoride-trifluoroethylene; P(VDF-TrFE)) is one of the most promising electroactive polymers with numerous application potentials in many fields of industry. Because of its good electro-mechanical properties P(VDF-TrFE) has been used for a number of sensors and actuators and also can be used for monitoring composite structure behaviors as a sensor. Three different ways (Electrical poling, annealing-cooling, and pressing) to enhance ${\beta}$-phase of P(VDF-TrFE) film were carried out. A microscopic analysis was conducted using X-ray diffraction to investigate the effect of such treatments on piezoelectric properties of P(VDF-TrFE) film. From the results, poling, annealing-cooling, and pressing were all effective to enhance ${\beta}$ crystallinity of P(VDF-TrFE) film and the maximum increase rate was 62.80% from 45.29% of the control group.

The Fabrication and Characteristics of 0-3 PbTiO$_3$/P(VDF/TrFE) Nanocomposite Thin Films for Passive Pyroelectric Infrared Sensors

  • Kwon, Sung-Yeol
    • KIEE International Transactions on Electrophysics and Applications
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    • v.4C no.2
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    • pp.73-76
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    • 2004
  • 0-3 PbTiO$_3$/P(VDF/TrFE) nanocomposite thin films for passive pyroelectric infrared sensors were fabricated by a two-step spin coating technique. 65wt% VDF and 35 wt% TrFE was formed into a P(VDF/TrFE) powder. Nano size PbTiO$_3$ powder was used. 0-3 connectivity of PbTiO$_3$/P(VDF/TrFE) composite film was successfully achieved and observed using SEM photography. The dielectric constant and pyroelectric coefficient were measured and compared with P(VDF/TrFE). A very low dielectric constant (13.48 at 1KHz and sufficiently high pyroelectric coefficient (3.101 nC/$\textrm{cm}^2$ㆍk at 5$0^{\circ}C$) were measured. This nanocomposite can be used for a new pyroelectric infrared sensor to achieve better performance.

Dielectric Properties of P(VDF/TrFE) Thin Films Prepared by Vapor Deposition Method (진공증착법으로 제조된 P(VDF/TrFE) 박막의 유전특성)

  • Jeong, Mu-Yeong;Yun, Jong-Hyeon;Lee, Seon-U;Park, Su-Hong;Yu, Do-Hyeon;Lee, Deok-Chul
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.50 no.1
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    • pp.1-5
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    • 2001
  • P(VDF/TrFE) copolymer thin films with 70/30 and 80/20 mol% VDF (polyvinylidene fluoride) and TrFE (trifluoroethylene) rates were prepared by using a vapor deposition method, During thin films were prepared, the substrate temperatures were maintained at 30 $^{\circ}C$ and 120 $^{\circ}C$, and the heating source temperature was fixed at 350 $^{\circ}C$. Contary to PVDF homopolymer, P(VDF/TrFE) copolymers showed the Curie point(Tc) below the melting point. The Curie point (Tc) and the melting point of the P(VDF/TrFE) copolymers were changed as a function of substrate temperature and the VDF mol%. The Curie point and the melting point of P(VDF/TreFE) thin films decreased and increased with increasing substrate temperature, respectively. Also with increasing VDF mol%, the melting point decreased slightly, however the Curie point increased.

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Pyroelectric Characteristics of 0-3 PbTiO3/P(VDF/TrFE) Nanocomposites Thin Films for Infrared Sensing

  • Kwon, Sung-Yeol
    • Korean Journal of Materials Research
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    • v.17 no.4
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    • pp.236-238
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    • 2007
  • [ 0-3PbTiO_3/P$ ](VDF/TrFE) nanocomposites thin films for passive pyroelectric infrared sensor have been fabricated by two-step spin coating technique. 65 wt% VDF and 35 wt% TrFE was formed to a P(VDF/TrFE) poder Nano size $PbTiO_3$ powder was used. 0-3 connectivity of $PbTiO_3$(VDF/TrFE) composites film is achieved and also observed by SEM photography successfully. The dielectric constant, and pyroelectric coefficient measured and compared with P (VDF/TrFE). A very low dielectric constant (13.48 at 1 kHz) and high enough pyroelectric coefficient (3.101 $nC/cm^2$.k at $50^{circ}C$) neasured. This nanocomposites can be used for a new pyroelectric infrared sensor for better performance.

Characteristics of P(VDF-TrFE) copolymer film with composition variation (조성 변화에 따른 P(VDF-TrFE) 박막의 특성)

  • Jung, Soon-Won;Yoon, Sung-Min;Kang, Seung-Youl;Yu, Byoung-Gon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.125-125
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    • 2009
  • 유기물 강유전체 재료를 이용한 비휘발성 메모리에 대한 연구가 활발하게 진행되고 있다. 현재까지 알려진 대표적인 재료는 P(VDF-TrFE)이다. P(VDF-TrFE)는 결정화 온도가 낮기 때문에 저온공정이 가능하여 향 후 플렉서블 소자 응용에도 유망하다. 최근의 연구결과에서는 고유전율의 절연층을 삽입함으로써 누설전류를 감소시켜, 저전압에서 우수한 강유전성이 얻어질이 보고되고 있다. 본 논문에서는 P(VDF-TrFE)의 조성 변화를 통하여 최적의 강유전성이 얻어지는 조건을 찾고자 노력하였으며, 조성 변화에 따른 구조적, 전기적 특성에 대하여 보고한다.

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Novel P(VDF-TrFE) Polymer Electrolytes: Their Use in High-Efficiency, All-Solid-State Electrochemical Capacitors Using ZnO Nanowires

  • Park, Young Jun;Bae, Joonho
    • Journal of Electrochemical Science and Technology
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    • v.9 no.2
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    • pp.126-132
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    • 2018
  • For the first time, an innovative approach using P(VDF-TrFE) as a polymer electrolyte for high efficiency, all-solid-state supercapacitors is presented. The polymer electrolyte was successfully achieved by dissolving P(VDF-TrFE) copolymers in dimethylformamide (DMF). Thermal analysis and infrared spectroscopy revealed excellent thermal stability up to $400^{\circ}C$ and copolymer's interaction with DMF. Electrochemical capacitors fabricated using P(VDF-TrFE) in DMF and ZnO NWs demonstrated high capacitive performance. Furthermore, the gel electrolyte-based supercapacitors demonstrated excellent mechanical durability up to a bend angle of $120^{\circ}$. Novel P(VDF-TrFE) electrolytes could be a promising approach for applications in flexible, fabric-based, and high-efficiency energy devices.