Lead-Free Perovskite Cs3Bi2I9-Derived Electroactive PVDF Composite-Based Piezoelectric Nanogenerators for Physiological Signal Monitoring and Piezo-Phototronic-Aided Strain Modulated Photodetectors

Mondal, Bidya; Mishra, Hari Krishna; Sengupta, D.; Kumar, Ajay; Babu, Anand; Saini, Dalip; Gupta, Varun; Mandal, Dipankar

doi:10.1021/acs.langmuir.2c01686

Cited by 32 publications

(33 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Once the sensor data are obtained, it could be further preprocessed and separated in the training and test data. Furthermore, this training data can be run over different ML algorithms to obtain the maximum precision with respect to the test data. − Once the model is successfully trained, then we can expose this model with new data sets and see the predicted results as shown in above schematics (Figure a).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Machine Learning-Aided All-Organic Air-Permeable Piezoelectric Nanogenerator

Gupta¹,

Kumar²,

Mondal³

et al. 2023

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

All-organic piezoelectric mechanical energy harvesters display an excellent electrical output with higher sensitivity due to the superior electrode compatibility between active materials and organic electrodes in comparison to that of metal electrodes. Herein, a stretchable, breathable, and flexible all-organic piezoelectric nanogenerator, made up of PVDF nanofibers and δ-PVDF nanoparticles, fabricated through the electrospinning process in a single step, has been demonstrated for prospective machine learning applications. The δphase PVDF nanoparticles serve as efficient active piezoelectric and ferroelectric components with a piezoelectric coefficient of ∼13 pm/V. In terms of electrical response, a peak-to-peak ∼V OC of 4 V, I SC of 1.8 μA, and maximum power density of ∼1600 μW/m 2 were obtained. The fabricated device also exhibits excellent stretchability and air permeability, enabling the properties of robust wearable devices with a water vapor transmission rate of ∼250 g m −2 day −1 . Here, we have shown that a machine learning algorithm proposed for the different finger motion responses can predict with 94.6% accuracy. Thus, it could recognize different finger gestures efficiently with the highest possible accuracy and predict the possible source point. This feature could be advantageous for prospective health care and security purposes apart from the device and sensor applications.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Finally, we achieved the δ-PVDF nanoparticle-based flexible PNG to harvest the energy from mechanical vibrations and motions. [44][45][46][47][48][49]52 The working mechanism of the fabricated PNG is demonstrated in details (Supporting Information, Figure S8 and Discussion S1).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Machine Learning-Aided All-Organic Air-Permeable Piezoelectric Nanogenerator

Gupta¹,

Kumar²,

Mondal³

et al. 2023

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Figure 6d indicates that the magnitude of the current is very low (<5 nA) under dark conditions (inset of Figure 6d). This is due to the relatively lesser number of charge carriers in the conduction band 69 . On the other hand, light illumination leads to an increase in photocurrent due to an increase in the relative number of charge carriers in the conduction band.…”

Section: Resultsmentioning

confidence: 99%

“…This is due to the relatively lesser number of charge carriers in the conduction band. 69 On the other hand, light illumination leads to an increase in photocurrent due to an increase in the relative number of charge carriers in the conduction band. The application of strain further modulates the transport properties of nanocomposite film and leads to an increase in current upto 62 nA by tunning the piezopotential distribution (Figure 6d).…”

Section: Piezo-phototronic Effectmentioning

confidence: 99%

Multifunctional poly(vinylidene fluoride–co‐hexafluoropropylene) ‐ zinc stannate nanocomposite for high energy density capacitors and piezo‐phototronic switching

Kumar

Mandal

2023

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

Electroactive multifunctional nanocomposite films of poly(vinylidene fluoride – co ‐ hexafluoropropylene) (P(VDF‐HFP)) and different zinc stannate (ZnSnO3) filler concentrations were processed by hot pressing to achieve multilayer structure formation. A notable increase in the dielectric constant (K ≈ 30 at 1 kHz) was achieved in the three‐layered hot‐pressed composite film. The resultant relaxation time, that is, the time required to reach the remnant polarization (Pr) from saturation polarization (Ps) of hot‐pressed films reduced to 1/20th time to that of its single‐layer film. Furthermore, ferroelectric loop data of hot‐pressed structure shows the lower value of remnant polarization (0.20 μC/cm2) as compared to nanocomposite film (0.28 μC/cm2) under similar measurement conditions, which further leads to an increase in energy density (2900 mJ/cm3 at 250 MV/m vs 500 mJ/cm3 at 150 MV/m). The study shows the dependency of energy storage and remnant polarization on the relaxation time of dielectric that can be further explored to enhance the energy density of dielectric capacitors. Thereafter, the multifunctional nature of nanocomposite film is shown by coupling semiconducting, light and piezoelectric effects in piezo‐phototronic switching under tensile and compressive strain in dark and light conditions.

show abstract

“…The flexibility of the nanofiber-based PENGs makes them favorable for applications in the area of wearable sensors. , The composite PENG was also employed to detect various human physiological motions (Figure a), such as wrist bending, knee bending, elbow bending, finger bending, and jaw motion, as shown in Figure b–f, respectively. The device was directly pasted onto the skin at the body joints using polyurethane (PU) tape.…”

Section: Resultsmentioning

confidence: 99%

Utilizing Strain-Engineered Stable Halide Perovskite for Interfacial Interaction with Molecular Dipoles To Enhance Ferroelectric Switching and Piezoresponse in Polymer Composite Nanofibers

Mallick¹,

Gupta²,

Jain³

et al. 2022

Langmuir

Self Cite

View full text Add to dashboard Cite

Mechanical and solar to electrical energy conversion using piezoand ferroelectric and photovoltaic effects may be a practical answer to the rising energy demand. In this quest, piezoelectric polymer poly(vinylidene fluoridehexafluoroproylene) (P(VDF-HFP)) has gained interest due to its superior piezo-and ferroelectricity. In photovoltaic applications, inorganic halide perovskite (IHP) of CsPbI 3 is considered a prime model compound. However, its application is limited because of the photoactive perovskite phase instability at ambient conditions. Here, we report the in situ synthesis of the stable perovskite γ-CsPbI 3 through an electrospinning process at room temperature, encapsulated within a ferroelectric copolymer poly(vinylidene fluoridehexafluoroproylene) (P(VDF-HFP)) as a composite nanofiber. Computational calculation using density functional theory (DFT) reveals that tensile strain plays a critical role in the dynamical stabilization of γ-CsPbI 3 . This tensile strain is triggered by the electrospinning process, which aids in the formation and growth of γ-CsPbI 3 . In the CsPbI 3 −P(VDF-HFP) composite nanofiber, γ-CsPbI 3 nucleates the polar β-crystalline phase in P(VDF-HFP), which results in the intrinsic piezo-and ferroelectric characteristics. The γ-CsPbI 3 aids in preferable molecular dipole orientation, resulting in improved nanoscale piezo-and ferroelectric properties. The composite nanofiber features a higher piezoelectric d 33 magnitude (∼30 pm/V) and lower decay constant for polarized domains (τ composite ≈ 17). The composite was utilized as a piezoelectric nanogenerator to demonstrate human physiological motion monitoring in self-power mode. The relevant pressure sensitivities of 81 and 40 mV/kPa for the low-pressure (<0.6 kPa) and high-pressure (>0.6 to 12 kPa) ranges, respectively, promise its suitability in the health care sector.

show abstract

Lead-Free Perovskite Cs₃Bi₂I₉-Derived Electroactive PVDF Composite-Based Piezoelectric Nanogenerators for Physiological Signal Monitoring and Piezo-Phototronic-Aided Strain Modulated Photodetectors

Cited by 32 publications

References 74 publications

Machine Learning-Aided All-Organic Air-Permeable Piezoelectric Nanogenerator

Machine Learning-Aided All-Organic Air-Permeable Piezoelectric Nanogenerator

Multifunctional poly(vinylidene fluoride–co‐hexafluoropropylene) ‐ zinc stannate nanocomposite for high energy density capacitors and piezo‐phototronic switching

Utilizing Strain-Engineered Stable Halide Perovskite for Interfacial Interaction with Molecular Dipoles To Enhance Ferroelectric Switching and Piezoresponse in Polymer Composite Nanofibers

Contact Info

Product

Resources

About