Flexible PVDF ferroelectric capacitive temperature sensor

Khan, Naveed Ahmad; Omran, Hesham; Yao, Yingbang; Salama, Khaled N.

doi:10.1109/mwscas.2015.7282063

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…The room temperature was 27 o C and the initial capacitance at this temperature was measured to be 5.6 Fig.5 which is 3.5 times more than that of pure PVDF-TrFE based temperature sensor reported in [12]. The increase in capacitance is attributed to increase in composite permittivity.…”

Section: Temperature Sensingmentioning

confidence: 71%

Multifunctional flexible PVDF-TrFE/BaTiO<inf>3</inf> based tactile sensor for touch and temperature monitoring

2017

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Abstract-This paper presents an enhanced piezoelectricity based sensor for touch and temperature sensing. The sensor is realized over flexible polyimide film, making it suitable for application like e-skin. The sensing material is composed of Polyvinylidene Fluoride-Trifluoroethylene (PVDF-TrFE) and Barium Titanate (BaTiO3) nanoparticles. While, the piezoelectric polymer PVDF-TrFE ensures the flexibility of sensor, BaTiO3 imparts high sensitivity to touch and temperature. The sensor is tested over temperature range which is common in daily life and the sensitivity to touch is characterized by tapping mode using fixed load. The results confirms the advantage of using poly-ceramic composite over piezoelectric polymer.

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Section: Temperature Sensingmentioning

confidence: 71%

Multifunctional flexible PVDF-TrFE/BaTiO<inf>3</inf> based tactile sensor for touch and temperature monitoring

2017

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“…In detail, it is known that the dielectric constant of PVDF increases with temperature in a range between 100 and 400 K [14] at frequencies between 500 Hz and 100 kHz as confirmed by impedance measurements [15]. PVDF has been employed as an active dielectric material in capacitive temperature sensors by Khan et al [16] reporting a sensitivity of 0.711%/°C therefore, PVDF-based capacitors can be considered as good candidates for temperature sensing in circuits operating in AC. One specific case is the employment of sensitized capacitors as parasitic capacitors in High-Frequency RFID (Radio Frequency IDentification) tags as described in [17].…”

Section: Introductionmentioning

confidence: 89%

“…One possible principle of operation for PVDF capacitive temperature sensors is based on the exploitation of the ferroelectric properties of such dielectric material. In fact, the dielectric constant of a ferroelectric material changes significantly below its Curie temperature [16]. Anyway, in order to obtain consistent piezo-and pyro-electricity in PVDF films, usually a stretching process has to be applied to relatively thick free-standing films but it is evident that when processing thin film electronic devices such conditions cannot be considered applicable nor desirable.…”

Section: Introductionmentioning

confidence: 99%

Application of PVDF-[BMIM][PF6] blends as the active material in screen-printed interdigital capacitors for temperature sensing

Miscioscia

Borriello

Mauro

et al. 2019

Smart Mater. Struct.

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This work shows a method to fabricate interdigital capacitors having tunable sensitivity to temperature and stable behavior pointing to the application of ionic liquids (ILs) as fundamental building blocks in capacitive devices for temperature sensing in proximity conditions. Polyvinylidene fluoride (PVDF) in blend with 1-Butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) has been deposited by drop-casting from a N,Ndimethylformamide solution to be utilized as dielectric material in screen-printed interdigitated capacitors. Capacitance and conductance trends versus temperature have been analyzed and compared to bare PVDF dielectrics. The inclusion of [BMIM][PF6] in PVDF-IL blends increases the AC capacitance of the device and its sensitivity to the temperature in the examined range (+20 °C to +110 °C). AC measurements performed at 100 kHz have shown good electrical stability for PVDF-IL blends also when measured in ambient atmosphere. As a drawback, an increase in [BMIM][PF6] concentration resulted also in an increase in AC conductance which exhibits an Arrhenius activation with temperature. Such behavior has been attributed to the increase in ion concentration and ionic mobility with temperature. The work also shows the presence of a limit value for the activation energy of AC conductance for higher concentrations of the ionic liquid.

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“…In the 1960s, capacitive sensors started to be used to measure strains at high temperatures with good long-term stability. , Capacitive sensors have some advantages such as low-power consumption (capacitive sensors do not consume DC currents), and the sensor output can be directly designed to digital output using energy-efficient capacitance-to-digital converter circuitry, avoiding nonidealities of voltage buffers and signal conditioning integrated circuits …”

Section: Applicationsmentioning

confidence: 99%

Smart and Multifunctional Materials Based on Electroactive Poly(vinylidene fluoride): Recent Advances and Opportunities in Sensors, Actuators, Energy, Environmental, and Biomedical Applications

Costa,

Cardoso,

Martins

et al. 2023

Chem. Rev.

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From scientific and technological points of view, poly(vinylidene fluoride), PVDF, is one of the most exciting polymers due to its overall physicochemical characteristics. This polymer can crystalize into five crystalline phases and can be processed in the form of films, fibers, membranes, and specific microstructures, being the physical properties controllable over a wide range through appropriate chemical modifications. Moreover, PVDF-based materials are characterized by excellent chemical, mechanical, thermal, and radiation resistance, and for their outstanding electroactive properties, including high dielectric, piezoelectric, pyroelectric, and ferroelectric response, being the best among polymer systems and thus noteworthy for an increasing number of technologies. This review summarizes and critically discusses the latest advances in PVDF and its copolymers, composites, and blends, including their main characteristics and processability, together with their tailorability and implementation in areas including sensors, actuators, energy harvesting and storage devices, environmental membranes, microfluidic, tissue engineering, and antimicrobial applications. The main conclusions, challenges and future trends concerning materials and application areas are also presented.

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Flexible PVDF ferroelectric capacitive temperature sensor

Cited by 4 publications

References 19 publications

Multifunctional flexible PVDF-TrFE/BaTiO<inf>3</inf> based tactile sensor for touch and temperature monitoring

Multifunctional flexible PVDF-TrFE/BaTiO<inf>3</inf> based tactile sensor for touch and temperature monitoring

Application of PVDF-[BMIM][PF6] blends as the active material in screen-printed interdigital capacitors for temperature sensing

Smart and Multifunctional Materials Based on Electroactive Poly(vinylidene fluoride): Recent Advances and Opportunities in Sensors, Actuators, Energy, Environmental, and Biomedical Applications

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