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Cooperativity in the enhanced piezoelectric response of polymer nanowires.

Persano L, Dagdeviren C, Maruccio C, De Lorenzis L, Pisignano D - Adv. Mater. Weinheim (2014)

Bottom Line: Multilayered, aligned arrays of organic nanowires show unique advantages in their piezoelectric response.Here, the cooperative, electromechanical mechanism at the base of the enhanced response of aligned arrays of piezoelectric nanostructures in mutual contact is unveiled.An enhancement of the piezoelectric voltage by two orders of magnitude compared with individual nanofibers is demonstrated in the arrays.

View Article: PubMed Central - PubMed

Affiliation: National Nanotechnology Laboratory of Istituto Nanoscienze-CNR, Via Arnesano, I-73100, Lecce, Italy.

No MeSH data available.


a) Voltage distribution on the surface of nanofibers with rectangular (R, top row) and circular cross-section (C, bottom row), and having different length (L, 2L, 4L, 8L). The same pressures (120 Pa) are applied in all the investigated cases. For each fiber, red (blue) corresponds to high (low) voltage values, and the overall output voltage bias at termination is reported, highlighting a clear proportionality between fiber length and generated voltage. V0,R = 0.90 μV and V0,C = 1.95 μV indicate values obtained with a fiber of length L. b) Comparison of nanofibers with same length, L, and either rectangular or circular cross-section. c) Comparison of nanofibers with elliptical cross-section and different b/a ratios. For each fiber, we show the corresponding output voltage which range from 2.18 to 0.78 times V0,C upon varying the b/a ratio. Bottom inset: ellipse cross-section and a and b axes.
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fig03: a) Voltage distribution on the surface of nanofibers with rectangular (R, top row) and circular cross-section (C, bottom row), and having different length (L, 2L, 4L, 8L). The same pressures (120 Pa) are applied in all the investigated cases. For each fiber, red (blue) corresponds to high (low) voltage values, and the overall output voltage bias at termination is reported, highlighting a clear proportionality between fiber length and generated voltage. V0,R = 0.90 μV and V0,C = 1.95 μV indicate values obtained with a fiber of length L. b) Comparison of nanofibers with same length, L, and either rectangular or circular cross-section. c) Comparison of nanofibers with elliptical cross-section and different b/a ratios. For each fiber, we show the corresponding output voltage which range from 2.18 to 0.78 times V0,C upon varying the b/a ratio. Bottom inset: ellipse cross-section and a and b axes.

Mentions: Single Piezoelectric Fibers: For fibers of both cylindrical and rectangular shape, increasing the length by a given factor leads to an increase of the output voltage by roughly the same factor as shown in Figure3a, for same values of applied pressures. This allows the nanogenerator to be described by modeling segments of fibers much shorter than in experiments, thus significantly saving computational time. Validating such a Vout(L) dependence, one legitimates analyzing fibers of shorter length, and using results to compute those for any desired length through linear correlation. In addition, for fibers with rectangular cross-sections we found that Vout does not depend on the width, W, under a constant pressure, whereas it is enhanced upon increasing the thickness, T, since the system correspondingly becomes less stiff.


Cooperativity in the enhanced piezoelectric response of polymer nanowires.

Persano L, Dagdeviren C, Maruccio C, De Lorenzis L, Pisignano D - Adv. Mater. Weinheim (2014)

a) Voltage distribution on the surface of nanofibers with rectangular (R, top row) and circular cross-section (C, bottom row), and having different length (L, 2L, 4L, 8L). The same pressures (120 Pa) are applied in all the investigated cases. For each fiber, red (blue) corresponds to high (low) voltage values, and the overall output voltage bias at termination is reported, highlighting a clear proportionality between fiber length and generated voltage. V0,R = 0.90 μV and V0,C = 1.95 μV indicate values obtained with a fiber of length L. b) Comparison of nanofibers with same length, L, and either rectangular or circular cross-section. c) Comparison of nanofibers with elliptical cross-section and different b/a ratios. For each fiber, we show the corresponding output voltage which range from 2.18 to 0.78 times V0,C upon varying the b/a ratio. Bottom inset: ellipse cross-section and a and b axes.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4282026&req=5

fig03: a) Voltage distribution on the surface of nanofibers with rectangular (R, top row) and circular cross-section (C, bottom row), and having different length (L, 2L, 4L, 8L). The same pressures (120 Pa) are applied in all the investigated cases. For each fiber, red (blue) corresponds to high (low) voltage values, and the overall output voltage bias at termination is reported, highlighting a clear proportionality between fiber length and generated voltage. V0,R = 0.90 μV and V0,C = 1.95 μV indicate values obtained with a fiber of length L. b) Comparison of nanofibers with same length, L, and either rectangular or circular cross-section. c) Comparison of nanofibers with elliptical cross-section and different b/a ratios. For each fiber, we show the corresponding output voltage which range from 2.18 to 0.78 times V0,C upon varying the b/a ratio. Bottom inset: ellipse cross-section and a and b axes.
Mentions: Single Piezoelectric Fibers: For fibers of both cylindrical and rectangular shape, increasing the length by a given factor leads to an increase of the output voltage by roughly the same factor as shown in Figure3a, for same values of applied pressures. This allows the nanogenerator to be described by modeling segments of fibers much shorter than in experiments, thus significantly saving computational time. Validating such a Vout(L) dependence, one legitimates analyzing fibers of shorter length, and using results to compute those for any desired length through linear correlation. In addition, for fibers with rectangular cross-sections we found that Vout does not depend on the width, W, under a constant pressure, whereas it is enhanced upon increasing the thickness, T, since the system correspondingly becomes less stiff.

Bottom Line: Multilayered, aligned arrays of organic nanowires show unique advantages in their piezoelectric response.Here, the cooperative, electromechanical mechanism at the base of the enhanced response of aligned arrays of piezoelectric nanostructures in mutual contact is unveiled.An enhancement of the piezoelectric voltage by two orders of magnitude compared with individual nanofibers is demonstrated in the arrays.

View Article: PubMed Central - PubMed

Affiliation: National Nanotechnology Laboratory of Istituto Nanoscienze-CNR, Via Arnesano, I-73100, Lecce, Italy.

No MeSH data available.