Homogeneously dispersed urchin-structured Fe3O4 with graphitic carbon spines inside poly(vinylidene fluoride) for efficient thermal conduction

2020 ◽  
Vol 192 ◽  
pp. 108106 ◽  
Author(s):  
Chunyu Du ◽  
Min Cao ◽  
Mei Li ◽  
Hong Guo ◽  
Rukang Liu ◽  
...  
Keyword(s):  
Thermal Conduction ◽  
Vinylidene Fluoride ◽  
Graphitic Carbon ◽  
Poly Vinylidene Fluoride

Integrated Pyroelectric Infrared Sensor Using Pvdf thin Film Deposited by Electro-Spray Method

1993 ◽  
Vol 310 ◽  
Author(s):  
Ryouji Asahi ◽  
Jiro Sakata ◽  
Osamu Tabata ◽  
Midori Mochizuki ◽  
Susumu Sugiyama ◽  
...  
Keyword(s):  
Thin Film ◽  
Silicon Substrate ◽  
Thermal Conduction ◽  
Vinylidene Fluoride ◽  
Sacrificial Layer ◽  
Pyroelectric Coefficient ◽  
Infrared Sensor ◽  
Etching Technique ◽  
Spray Method ◽  
Poly Vinylidene Fluoride

AbstractA pyroelectric infrared sensor using a poly(vinylidene fluoride) (PVDF) thin film has been integrated with a read-out circuit on a silicon substrate. The PVDF thin film with a thickness of 1-2 µm was deposited on the sensing area by an electro-spray (ESP) method. A form I crystal and a large pyroelectric coefficient of 4 nCcm−2K−1 were observed just after the deposition without any poling treatments. The fabrication process of the sensor was based on a standard MOS LSI process and a polysilicon sacrificial layer etching technique. In order to reduce the heat capacitance and the thermal conduction, the PVDF thin film was supported on a thin Si3N4 membrane structure formed by etching a part of the silicon substrate under the sensing area. The sensor with a sensing area of 400x400 µm2 had a responsivity of 98 V/W, a detectivity of l.4× 107 cmHz1/2W−1, an NEP of 2.9× 10−99 Hz1/2W at a frequency of 100 Hz and a time constant of 1.3 msec.

Piezoelectric β-polymorph formation of new textiles by surface modification with coating process based on interfacial interaction on the conformational variation of poly (vinylidene fluoride) (PVDF) chains

2020 ◽  
Vol 91 (3) ◽  
pp. 31301
Author(s):  
Nabil Chakhchaoui ◽  
Rida Farhan ◽  
Meriem Boutaldat ◽  
Marwane Rouway ◽  
Adil Eddiai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Vinylidene Fluoride ◽  
Research Work ◽  
Research Area ◽  
Interfacial Interaction ◽  
Tetraethyl Orthosilicate ◽  
Poly Vinylidene Fluoride ◽  
Carbon Nanofillers ◽  
The Impact ◽  
Advanced Applications

Novel textiles have received a lot of attention from researchers in the last decade due to some of their unique features. The introduction of intelligent materials into textile structures offers an opportunity to develop multifunctional textiles, such as sensing, reacting, conducting electricity and performing energy conversion operations. In this research work nanocomposite-based highly piezoelectric and electroactive β-phase new textile has been developed using the pad-dry-cure method. The deposition of poly (vinylidene fluoride) (PVDF) − carbon nanofillers (CNF) − tetraethyl orthosilicate (TEOS), Si(OCH2CH3)4 was acquired on a treated textile substrate using coating technique followed by evaporation to transform the passive (non-functional) textile into a dynamic textile with an enhanced piezoelectric β-phase. The aim of the study is the investigation of the impact the coating of textile via piezoelectric nanocomposites based PVDF-CNF (by optimizing piezoelectric crystalline phase). The chemical composition of CT/PVDF-CNC-TEOS textile was detected by qualitative elemental analysis (SEM/EDX). The added of 0.5% of CNF during the process provides material textiles with a piezoelectric β-phase of up to 50% has been measured by FTIR experiments. These results indicated that CNF has high efficiency in transforming the phase α introduced in the unloaded PVDF, to the β-phase in the case of nanocomposites. Consequently, this fabricated new textile exhibits glorious piezoelectric β-phase even with relatively low coating content of PVDF-CNF-TEOS. The study demonstrates that the pad-dry-cure method can potentially be used for the development of piezoelectric nanocomposite-coated wearable new textiles for sensors and energy harvesting applications. We believe that our study may inspire the research area for future advanced applications.

Effect of Carbon Nanotubes on the Shape Memory Performance of Poly(vinylidene fluoride)/Acrylic Blends

2013 ◽  
Vol 30 (2) ◽  
pp. 134
Author(s):  
Hui FU ◽  
Jishan QIU ◽  
Ning CHONG ◽  
Yaqing WANG ◽  
Yuanyuan TIAN ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Vinylidene Fluoride ◽  
Memory Performance ◽  
Poly Vinylidene Fluoride

Discharge Poling and Poly(Vinylidene Fluoride) Films

1991 ◽  
Author(s):  
Y. Takase ◽  
J. I. Scheinbeim ◽  
B. A. Newman
Keyword(s):  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride
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