Unlocking the hybrid piezo and pyroelectric nanogenerators performance by SiO2 nanowires confinement in poly(vinylidene fluoride)

Ana Borras; Angel Barranco; Francisco J. Aparicio; Hari Krishna Mishra; Juan Delgado-Alvarez; Juan R. Sanchez-Valencia; Victor Lopez-Flores; Xabier Garcia-Casas

REVIEW 3 major objections 5 minor 7 references

Unlocking the hybrid piezo and pyroelectric nanogenerators performance by SiO2 nanowires confinement in poly(vinylidene fluoride)

T0 review · 3 major / 5 minor · reviewed 2026-08-07 · deepseek-v4-flash

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Pith's one-line read Confining PVDF around vertical SiO2 nanowires and poling it multiplies piezoelectric power output ninefold and pyroelectric response fourfold.

desk verdict A promising PVDF/SiO2 nanowire device architecture whose headline 9x/4x performance numbers rest on an open-circuit power formula and unreported electrode area; qualitative phase results are more solid than the quantitative claims. read the letter →

arxiv 2506.01580 v2 pith:5MXW6GNN submitted 2025-06-02 cond-mat.mtrl-sci physics.app-phphysics.plasm-ph

Juan Delgado-Alvarez , Hari Krishna Mishra , Francisco J. Aparicio , Xabier Garcia-Casas , Angel Barranco , Juan R. Sanchez-Valencia , Victor Lopez-Flores , Ana Borras This is my paper

classification cond-mat.mtrl-sciphysics.app-phphysics.plasm-ph

keywords piezoelectricitypyroelectricitypoly(vinylidenefluoride)SiO2nanowiresnanoconfinementelectricalpolingenergyharvestingplasma-enhancedchemicalvapordeposition

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper claims that confining poly(vinylidene fluoride) around vertically aligned silicon dioxide nanowires and then poling the composite in place converts the polymer into a more effective piezo- and pyroelectric energy harvester. The authors report a peak piezoelectric power density of about $10.8\,\mu\text{W}/\text{m}^2$, roughly nine times the $1.12\,\mu\text{W}/\text{m}^2$ of a plain PVDF film, and a pyroelectric coefficient of about $1.4\,\mu\text{C}/\text{m}^2\text{K}$, roughly four times the $0.35\,\mu\text{C}/\text{m}^2\text{K}$ of the plain film. If true, the result matters because it offers a low-temperature, flexible route to devices that harvest both mechanical vibration and waste heat from a single polymer layer, addressing the intermittent nature of each source alone. The key claim is that the silica nanowire scaffold, through surface chemistry and nanoconfinement, nucleates the electroactive $\beta$ and $\gamma$ phases of PVDF, and electrical poling then aligns those dipoles.

What carries the argument

The load-bearing element is the vertical SiO2 nanowire scaffold produced from organic nanowire soft templates coated with a plasma-enhanced chemical vapor deposited SiO2 shell at room temperature. It works in two ways: its silanol-rich surface triggers hydrogen bonding and electrostatic interactions that nucleate the polar $\beta$/ $\gamma$ phases of PVDF during infiltration, and its stiffness and vertical alignment transfer mechanical deformation more effectively to the polymer and modulate thermal stress during heating and cooling. Electrical poling through the top and bottom electrodes then reorients the remaining random dipoles, completing the phase enhancement.

What would settle it

Re-measure both device types with identical active electrode areas and record the voltage across the matched load resistor rather than the open-circuit voltage; if the 9x and 4x performance ratios disappear under those conditions, the reported enhancement is a normalization artifact rather than a confinement effect.

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Extended reading notes

Core claim

The paper's central claim is that a vertically aligned SiO2 nanowire template infiltrated with PVDF and poled through the device electrodes produces a PVDF matrix dominated by electroactive phases—$F(\beta) \sim 41\%$ and $F(\gamma) \sim 59\%$—and correspondingly larger energy outputs than bare PVDF films made identically. The nanowires act as a guiding scaffold: silanol groups on the plasma-deposited SiO2 surface hydrogen-bond with fluorine atoms of PVDF, and the negatively charged oxide surface attracts the positively charged CH2 groups, collectively lowering the energy barrier to the all-trans chain conformations that give the polar phases. The stiff, high-aspect-ratio nanowires also concentrate mechanical stress in the polymer, and in-device poling at 100–200 V aligns the remaining dipoles. The paper therefore attributes the roughly 9-fold piezoelectric power gain and 4-fold pyroelectric coefficient gain to confinement plus poling, rather than to a new material.

Load-bearing premise

The comparison assumes the bare PVDF and nanowire devices have equal active electrode area and identical measurement conditions, but the paper does not report the electrode area or the voltage across the load resistor.

Editorial extensions

If this is right

Poled SiO2 NWs@PVDF reaches a peak-to-peak open-circuit voltage of about 3 V versus about 0.1 V for poled bare PVDF at the ~11 Hz excitation frequency.
Peak piezoelectric power density rises from about $1.12\,\mu\text{W}/\text{m}^2$ for poled bare PVDF to about $10.8\,\mu\text{W}/\text{m}^2$ for poled SiO2 NWs@PVDF, with the optimal load resistance shifting from about 3 M$\Omega$ to about 100 M$\Omega$.
The pyroelectric coefficient rises from about $0.35\,\mu\text{C}/\text{m}^2\text{K}$ for poled bare PVDF to about $1.4\,\mu\text{C}/\text{m}^2\text{K}$ for poled SiO2 NWs@PVDF at a temperature difference of about 22 K.
In-device electrical poling at 100–200 V under ambient conditions raises the electroactive phase fractions to $F(\beta) \sim 41\%$ and $F(\gamma) \sim 59\%$ without high-temperature processing.
The same flexible ITO/PET device can harvest energy from both mechanical excitation at 10–12 Hz and thermal oscillations with $\Delta T$ from 9 to 22 K.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

Because power density is defined from the open-circuit voltage, reporting the matched-load voltage and the active electrode area would let other groups verify the 9x improvement under practical loading conditions.
The same surface-chemistry mechanism should transfer to other ferroelectric polymers, so replicating the scaffold with PVDF copolymers is a direct extension.
A spatially resolved infrared or Raman map across a single nanowire would test whether $\beta$/$\gamma$ phase enrichment is localized at the SiO2/PVDF interface as the mechanism requires.
Using a thermocouple in direct contact with the device, rather than near it, would separate the intrinsic pyroelectric coefficient from the composite's thermal-mass and heat-flow effects.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

The genuinely new thing here is the device architecture: vertically aligned SiO2 nanowires grown by soft-template PECVD, then infiltrated with PVDF, giving a flexible dual piezo/pyro nanogenerator. That specific combination is not in the cited literature, and the fabrication is clean — the SEM shows good infiltration, no agglomeration, and a uniform film. The FTIR-based phase analysis is mostly sound: the standard 840/763 formulas are applied correctly, and the increase in electroactive-phase bands with poling is visible in the spectra. The qualitative story — that the silica surface silanols and surface charge promote beta/gamma phase and improve stress transfer — is plausible and consistent with prior work on SiO2/PVDF composites.

But the stress-test note is on target, and the reader's conditional verdict is fair. The power density is computed from open-circuit voltage, P = V_OC^2/(R A), not from the voltage across the load. That is not the delivered power; it ignores the device's internal impedance and gives an upper bound, not a measured output. The problem is compounded by the shift in optimal load from ~3 MΩ to ~100 MΩ between the bare and composite devices, so the 9x ratio of V_OC-based powers likely does not equal the ratio of extractable powers. On top of that, the effective electrode area A is never stated anywhere, so both the power density and the pyroelectric coefficient p = I_SC/(A dT/dt) lack a common basis. The pyroelectric input is also approximate, since dT/dt comes from a thermocouple placed near, not on, the device.

These are load-bearing problems for the abstract's quantitative claims. The paper does not report error bars or repeated devices, and it never gives the baseline F(beta)/F(gamma) fractions for the bare PVDF TF, which weakens the claim that SiO2 confinement is what boosts phase content — especially because the text says the bare film already has almost no alpha phase.

That said, I would not dismiss the work. The fabrication and materials concept are worth examining, and all three quantitative issues are fixable: measure voltage across known load resistors, report the active electrode area, and give the phase fractions for the reference film. As it stands, I would not cite the 9x/4x numbers, but I would send this to peer review because the system is interesting and the errors are correctable rather than fatal. The reviewers should insist on the revised electrical characterization before any quantitative claims are taken seriously.

Referee Report

3 major / 5 minor

Summary. The manuscript reports a flexible hybrid piezo/pyroelectric nanogenerator (PPNG) based on PVDF infiltrated over vertically aligned SiO2 nanowires grown by a soft-template/PECVD route. The authors claim that nanoconfinement plus electrical poling raises the electroactive β/γ phase fraction, leading to a ~9-fold increase in piezoelectric peak power density (10.8 vs 1.12 µW/m²) and a ~4-fold increase in pyroelectric coefficient (1.4 vs 0.35 µC/m²K) compared to bare PVDF. The paper includes SEM, FTIR phase analysis, and voltage/current measurements under mechanical and thermal excitation.

Significance. If the quantitative claims were supported, this would be a useful contribution to flexible multisource energy harvesting, offering a scalable, low-temperature route to vertically aligned SiO2 templates that avoid nanofiller agglomeration. The qualitative evidence—FTIR showing enhanced electroactive phase content after poling, and the clear increase in output voltage/current for the composite—is internally consistent and the fabrication method is original. The authors are transparent about their measurement equations, but as detailed below, the central power-density and pyroelectric-coefficient numbers are not yet on a sound quantitative footing.

major comments (3)

[Performance of piezoelectric signal acquisition] The power density is calculated as P = V_OC^2/(R A) using the open-circuit voltage V_OC rather than the voltage V_R actually developed across the load resistor. For a load R, the delivered electrical power is P = V_R^2/R; using V_OC ignores the voltage divider between the device's internal impedance and R. This is quantitatively important here because the optimal load shifts from ~3 MΩ (bare PVDF) to ~100 MΩ (SiO2 NW@PVDF), so the two devices have very different internal impedances and the ratio of V_OC-based 'power' values does not correspond to the ratio of extractable powers. The 9-fold claim in the abstract and conclusion therefore needs to be recalculated from load-voltage data, or explicitly re-labeled as an upper-bound figure of merit.
[Experimental section / Performance of piezoelectric signal acquisition] The 'effective electrode area A' used in both P = V_OC^2/(R A) and p = I_SC/(A dT/dt) is never reported. If the active areas of the reference and composite devices differ, the reported power densities and pyroelectric coefficients are not on a common basis, and the 9x/4x ratios become ambiguous. Please report A for each device and either confirm the areas are identical or normalize accordingly.
[Temperature-induced pyroelectric signal generation] The pyroelectric coefficient is extracted from I_SC = pA(dT/dt), but dT/dt is derived from a thermocouple placed 'close to' the device, not directly on the active region, while the thermal stimulus is a hot-air gun on the top with cooling on the bottom. This introduces an unknown phase lag and amplitude error in the thermal rate, which propagates directly into p. The authors should specify the thermocouple mounting (e.g., attached to the top electrode, calibrated) and provide an uncertainty estimate for dT/dt; otherwise the absolute value p = 1.4 µC/m²K and the 4x ratio are not quantitatively reliable.

minor comments (5)

[Experimental section] In the Experimental section, the SiO2 seed layer is described as ~150 nm in the Results (Fig. 2a) but ~260 nm in the Experimental methods; please reconcile this discrepancy.
[References] Reference 40 is incomplete: 'J. Link, Stabilization and structural study of new nanocomposite materials, (n.d.)' lacks a journal, volume, and year.
[Figure 5 caption] The caption of Fig. 5 states 'temperature variation was between 9 to 22 K'; the phrasing should be 'between 9 and 22 K' or 'from 9 to 22 K'.
[Figure 4] The text states the unpoled PVDF TF has peak-to-peak V_OC = 80 mV while the poled has 100 mV; however, Fig. 4c shows the poled SiO2 NW@PVDF reaches ~3 V. Please verify that the axis scales are clearly labeled for all panels so the reader can distinguish the different devices.
[Performance of piezoelectric signal acquisition] The term 'instantaneous electrical peak power density' could be confused with instantaneous power during a cycle; consider defining whether this is the peak of the instantaneous power waveform or the average power at matched load.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the central piezoelectric and pyroelectric figures of merit are measured outputs, and the phase-fraction analysis uses external literature calibration constants rather than fitting the claimed enhancement.

full rationale

The paper's central claims are experimentally measured device outputs (open-circuit voltage, short-circuit current, and derived power density and pyroelectric coefficient) and phase fractions computed from ATR-FTIR band intensities using absorption coefficients K840 and K763 taken from an external reference (ref. 57). Equations (1)-(3) apply literature calibrations and do not assume the conclusion that SiO2 nanowire confinement enhances the electroactive phases. The piezoelectric power density P = V_OC^2/(R A) and the pyroelectric coefficient p = I_SC/(A dT/dt) are defining relations for reported quantities, not predictions obtained from fitted parameters. Although the power formula uses open-circuit voltage rather than the voltage across the load and the effective electrode area is not reported, these are measurement and reporting concerns, not circularity: the 9-fold and 4-fold improvements are not forced by construction. The self-citations present in the paper (refs. 42-44, 50, 62-63, and 65) support the synthesis protocol, the piezoelectric core@shell nanowire platform, and the open-access data-analysis software; none of them supplies the load-bearing assertion that SiO2 NW confinement improves energy-harvesting performance. No equation in the paper reduces to a fitted value, and no central premise is justified only by a same-author citation. Therefore the derivation chain is self-contained with respect to circularity, and the score is 0.

Assumptions & free parameters 2 free parameters · 4 assumptions · 0 invented entities

The central performance claims rely on two external numbers (FTIR absorption coefficients from ref 57) and on an unreported active area A. The main structural assumptions are that open-circuit voltage can stand in for load voltage in the power formula, that FTIR peak ratios cleanly separate beta/gamma phases, that the thermocouple reading approximates the device temperature, and that the reference and confined devices have identical geometry. No new physical entities are introduced.

free parameters (2)

Active electrode area A = not reported
Used in both P = V_OC^2/(R A) and I = p A dT/dt; the paper does not give A, so all absolute performance numbers are area-normalized with an unknown scale.
FTIR absorption coefficients K840, K763 = 7.7e4 and 6.1e4 cm2/mol
Taken from ref 57 and used in Eq. 1; the phase fractions F(beta)/F(gamma) depend linearly on the ratio K840/K763.

assumptions (4)

domain assumption The open-circuit voltage V_OC can be used in P = V_OC^2/(R A) to estimate power delivered to a load.
In standard load-matching analysis, power across R uses the voltage across R, which is less than V_OC; using V_OC overestimates power. This enters the piezoelectric power density results in Fig. 4b,d.
domain assumption FTIR peak intensities at 840, 763, 1276, 1234 cm-1 and the normalization to 1071 cm-1 uniquely determine phase fractions.
Standard method from ref 57, but it assumes no overlapping contributions and that the absorption coefficients are transferable to PECVD SiO2-confined films.
domain assumption The thermocouple reading near the device equals the true device temperature used in dT/dt for pyroelectric coefficient extraction.
The Experimental section states a thermocouple placed close to the device is linked to measurements; temperature lag or offset biases p.
domain assumption The reference PVDF TF and the SiO2 NW@PVDF device have the same active area and PVDF thickness.
The 9x and 4x comparisons are only meaningful if geometry is matched; the paper claims comparable thickness but does not report the active area of either device.

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Cite this review

Pith. "Pith review of Unlocking the hybrid piezo and pyroelectric nanogenerators performance by SiO2 nanowires confinement in poly(vinylidene fluoride)." pith.science (2026). https://pith.science/paper/5MXW6GNN

@misc{pith2026250601580,
  author       = {Pith},
  title        = {Pith review of: Unlocking the hybrid piezo and pyroelectric nanogenerators performance by SiO2 nanowires confinement in poly(vinylidene fluoride)},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/5MXW6GNN}},
  note         = {Machine review of arXiv:2506.01580}
}

read the original abstract

We report on the development of a novel flexible piezo/pyro-electric nanogenerator (PPNG) that combines a uniform film of poly(vinylidene fluoride) (PVDF) infiltrated over vertically supported SiO2 nanowires (NWs) to enhance both piezoelectric and pyroelectric energy harvesting capabilities. The synthetic procedure involves a low-temperature multi-step approach, including the soft-template formation of SiO2 NWs on a flexible substrate, followed by the infiltration of a PVDF thin film (TF). The plasma-enabled fabrication of SiO2 NWs facilitated vertical alignment and precise control over the surface microstructure, density, and thickness of the confined nanostructures. These strategic structural systems promote the development of the most favourable electroactive \b{eta}- and {\gamma}-phases in the PVDF matrix. Notably, the electrical poling plays a major role in aligning the random dipoles of the PVDF macromolecular chain in a more ordered fashion to nucleate the amplified electroactive phases. As a proof-of-concept, the fabricated PPNG exhibited a significant improvement in the instantaneous piezoelectric output power density (P), ~ 9-fold amplification relative to its bare PVDF TF counterpart. Analogously, the pyroelectric coefficient (p) demonstrated a 4-fold superior performance with referenced PVDF TF based PPNG. Thus, the engineered system of SiO2 NWs@PVDF comprising PPNG offers a promising pathway toward multisource energy harvesting capabilities through efficient energy transduction at mechanical excitation frequencies of 10-12 Hz and across a temperature difference ({\Delta}T) of 9 to 22 K.

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Works this paper leans on

7 extracted references · 7 canonical work pages

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Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.

[1] [1]

Nano-structured piezoelectric polymers for biomedical application,

1 G. Sim, H. Seo, J. Hwangbo, T. Kim, and Y . Choi, “Nano-structured piezoelectric polymers for biomedical application,” APL Electron. Devices 1(2), 021504 (2025). 2 L. Xiao, B. Yin, Z. Geng, J. Li, R. Jia, and K. Zhang, “Flexible wearable devices based on self-powered energy supply,” Nano Energy 142, 111157 (2025). 3 H. Li, C.R. Bowen, and Y . Yang, “Sca...

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Enhanced Piezoelectricity of Electrospun Polyvinylidene Fluoride Fibers for Energ y Harvesting,

Toncelli, D. Pisignano, A. Bernasik, S. Kar -Narayan, P. Sajkiewicz, and U. Stachewicz, “Enhanced Piezoelectricity of Electrospun Polyvinylidene Fluoride Fibers for Energ y Harvesting,” ACS Appl. Mater. Interfaces 12(11), 13575–13583 (2020). 10 P.C. Sherrell, A. Šutka, M. Timusk, and A. Šutka, “Alternatives to Fluoropolymers for Motion-Based Energy Harves...

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High - performance piezoelectric composites via β phase programming,

Chen, X. Zhao, X. Xiao, B. Li, H. Tai, Y . Jiang, L. -Q. Chen, F. Li, and J. Chen, “High - performance piezoelectric composites via β phase programming,” Nat. Commun. 13(1), 4867 (2022). 25 X. Yuan, J. Shi, Y . Kang, J. Dong, Z. Pei, and X. Ji, “Piezoelectricity, Pyroelectricity, and Ferroelectricity in Biomaterials and Biomedical Applications,” Adv. Mate...

work page 2022

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Vertically Aligned Hybrid Core/Shell Semiconductor Nanowires for Photonics Applications,

Frutos, A.R. Gonzalez -Elipe, and A. Borras, “Vertically Aligned Hybrid Core/Shell Semiconductor Nanowires for Photonics Applications,” Adv. Funct. Mater. 23(48), 5981–5989 (2013). 43 A.N. Filippin, J.R. Sanchez -Valencia, X. Garcia -Casas, V . Lopez-Flores, M. Macias -

work page 2013

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3D core -multishell piezoelectric nanogenerators,

Montero, F. Frutos, A. Barranco, and A. Borras, “3D core -multishell piezoelectric nanogenerators,” Nano Energy 58, 476–483 (2019). 44 J. Castillo -Seoane, J. Gil -Rostra, V . López-Flores, G. Lozano, F.J. Ferrer, J. P. Espinós, Kostya (Ken) Ostrikov, F. Yubero, A. R. González-Elipe, Á. Barranco, J. R. Sánchez-Valencia, and A. Borrás, “One -reactor vacuum...

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[6] [6]

Highly Stable 21 Photoluminescence in Vacuum-Processed Halide Perovskite Core–Shell 1D Nanostructures,

Correa-Baena, A. Barranco, J.R. Sanchez -Valencia, and A. Borras, “Highly Stable 21 Photoluminescence in Vacuum-Processed Halide Perovskite Core–Shell 1D Nanostructures,” Adv. Funct. Mater. 34(40), 2403763 (2024). 52 M. Alcaire, C. Lopez-Santos, F.J. Aparicio, J.R. Sanchez-Valencia, J.M. Obrero, Z. Saghi, V .J. Rico, G. de la Fuente, A.R. Gonzalez-Elipe, ...

work page 2024

[7] [7]

Plasma -Assisted Deposition of TiO 2 3D Nanomembranes: Selective Wetting, Superomniphobicity, and Self -Cleaning,

Barranco, C. López -Santos, and A. Borrás, “Plasma -Assisted Deposition of TiO 2 3D Nanomembranes: Selective Wetting, Superomniphobicity, and Self -Cleaning,” Adv. Mater. Interfaces 8(21), 2100767 (2021). 55 K. Tashiro, H. Yamamoto, S. Kummara, D. Tahara, K. Aoyama, and H. Sekiguchi, “Electric- Field-Induced Phase Transition and Crystal Structural Change ...

work page 2021