Enhanced Piezoelectric Coefficient of PVDF-TrFE Films via In Situ Polarization

Hu, Xiaoran; You, Mengli; Yi, Na; Zhang, Xiaokun; Xiang, Yong

doi:10.3389/fenrg.2021.621540

Cited by 29 publications

(13 citation statements)

References 38 publications

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“…2.1 for detailed procedures]. We chose PVDF-TrFE 21 – 23 as the piezoelectric material because it showed sufficient piezoelectricity (

21 ) to generate the 10-MHz signal to stimulate brain cells while being thin enough to achieve decent optical transparency to determine neuronal activities in vivo . Considering the small form factor of the glass coverslip, we designed the transducer with an area of

.…”

Section: Resultsmentioning

confidence: 99%

Implantable acousto-optic window for monitoring ultrasound-mediated neuromodulation in vivo

Lee

Choi

et al. 2022

Neurophoton.

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Significance: Ultrasound has recently received considerable attention in neuroscience because it provides noninvasive control of deep brain activity. Although the feasibility of ultrasound stimulation has been reported in preclinical and clinical settings, its mechanistic understanding remains limited. While optical microscopy has become the "gold standard" tool for investigating population-level neural functions in vivo, its application for ultrasound neuromodulation has been technically challenging, as most conventional ultrasonic transducers are not designed to be compatible with optical microscopy. Aim:We aimed to develop a transparent acoustic transducer based on a glass coverslip called the acousto-optic window (AOW), which simultaneously provides ultrasound neuromodulation and microscopic monitoring of neural responses in vivo. Approach:The AOW was fabricated by the serial deposition of transparent acoustic stacks on a circular glass coverslip, comprising a piezoelectric material, polyvinylidene fluoride-trifluoroethylene, and indium-tin-oxide electrodes. The fabricated AOW was implanted into a transgenic neural-activity reporter mouse after open craniotomy. Two-photon microscopy was used to observe neuronal activity in response to ultrasonic stimulation through the AOW.Results: The AOW allowed microscopic imaging of calcium activity in cortical neurons in response to ultrasound stimulation. The optical transparency was ∼40% over the visible and near-infrared spectra, and the ultrasonic pressure was 0.035 MPa at 10 MHz corresponding to 10 mW∕cm 2 . In anesthetized Gad2-GCaMP6-tdTomato mice, we observed robust ultrasoundevoked activation of inhibitory cortical neurons at depths up to 200 μm. Conclusions:The AOW is an implantable ultrasonic transducer that is broadly compatible with optical imaging modalities. The AOW will facilitate our understanding of ultrasound neuromodulation in vivo.

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“…2.1 for detailed procedures]. We chose PVDF-TrFE 21 – 23 as the piezoelectric material because it showed sufficient piezoelectricity (

.…”

Section: Resultsmentioning

confidence: 99%

Implantable acousto-optic window for monitoring ultrasound-mediated neuromodulation in vivo

Lee

Choi

et al. 2022

Neurophoton.

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“…The aggregation of CNT does not easily maintain the nature of high aspect ratio and thus the polarization efficiency decreases . Moreover, we compared with other PVDF based piezoelectric materials (PVDF/PDMS, PVDF/CNT, PVDF-TrFE, PVDF/P-CNT, PVDF/IL, PVDF/PMMA, PVDF/BaTiO3/MWCNT, PVDF/BTO, PVDF/MWCNT and PVDF/TrFE) as shown in Figure g. Our PVDF/CNT scaffold exhibited high beta crystal content, good mechanical property, and competitive output capability.…”

Section: Resultsmentioning

confidence: 99%

Toward Balanced Piezoelectric and Mechanical Performance: 3D Printed Polyvinylidene Fluoride/Carbon Nanotube Energy Harvester with Hierarchical Structure

Zheng

Song

et al. 2022

Ind. Eng. Chem. Res.

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With rapid consumption of fossil energy and its impact on the environment, the desire for clean energy is gradually increasing around the world, and piezoelectric polymers have received extensive attention owing to their capability to harvest discrete mechanical energy in the environment. However, the existing piezoelectric devices are mostly low-dimensional fibers or films, making it difficult to achieve a good balance between mechanical robustness and piezoelectric output. Herein, a polyvinylidene fluoride (PVDF)/multiwalled carbon nanotube (MWCNT) scaffold with a hierarchical porous structure and geometry was fabricated by chemical-foaming-assisted fused deposition modeling (FDM). Chemical foaming was triggered by the heat accompanied during FDM molding, where a microporous structure was formed inside the part without affecting the geometric design to realize strain accumulation in normal space. Moreover, the conductive MWCNT formed discontinuous and parallel morphology around the pores, which not only promotes the polling process and formation of electrets, but also avoids the electrical breakdown caused by the formation of the conductive network. Accordingly, the combined effect of hierarchical structure and incorporation of MWCNT leads to a balanced piezoelectric (open circuit voltage of 8.46 V and short circuit current of 157 nA) and mechanical performance (compressive modulus of 14.07 MPa). These excellent properties all demonstrate the potential capabilities of the developed piezoelectric nanogenerators in the field of self-powered nanosensors and portable devices.

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“…Therefore, we developed a procedure to cover our spheres-in-grating assemblies with a protective layer of P(VDF-TrFE) polymer. We selected this polymeric system for its foreseen benefits in electronic [ 58 ] and piezoelectric [ 59 ] applications. The sequence of optical images provided in Figure S3 compares a PS grating before ( Figure S3a ) and after its filling ( Figure S3b ) with blue-dyed spheres with the same PS grating filled with B spheres, which was further “encapsulated”/covered using a 3 ± 1 µm thick layer of P(VDF-TrFE) ( Figure S3c ).…”

Section: Resultsmentioning

confidence: 99%

Spheres-in-Grating Assemblies with Altered Photoluminescence and Wetting Properties

et al. 2022

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In this work, we report the fabrication of spheres-in-grating assemblies consisting of equally spaced parallel rectangular grooves filled with fluorescent spheres, by employing embossing and convective self-assembly methods. The developed hierarchical assemblies, when compared to spheres spin-cast on glass, exhibited a blueshift in the photoluminescence spectra, as well as changes in wetting properties induced not only by the patterning process, but also by the nature and size of the utilized spheres. While the patterning process led to increased hydrophobicity, the utilization of spheres with larger diameter improved the hydrophilicity of the fabricated assemblies. Finally, by aiming at the future integration of the spheres-in-grating assemblies as critical components in different technological and medical applications, we report a successful encapsulation of the incorporated spheres within the grating with a top layer of a functional polymer.

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Enhanced Piezoelectric Coefficient of PVDF-TrFE Films via In Situ Polarization

Cited by 29 publications

References 38 publications

Implantable acousto-optic window for monitoring ultrasound-mediated neuromodulation in vivo

Implantable acousto-optic window for monitoring ultrasound-mediated neuromodulation in vivo

Toward Balanced Piezoelectric and Mechanical Performance: 3D Printed Polyvinylidene Fluoride/Carbon Nanotube Energy Harvester with Hierarchical Structure

Spheres-in-Grating Assemblies with Altered Photoluminescence and Wetting Properties

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