Giant dielectric constant and band gap reduction in hydrothermal grown highly crystalline zinc silicate nanorods

Bharti, Dhiraj Kumar; Gupta, Manoj; Srivastava, Avanish Kumar

doi:10.1016/j.matlet.2018.08.085

Cited by 20 publications

(7 citation statements)

References 16 publications

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“…The dielectric constant (ε′) of the foam was calculated and found to be 3048 at low frequency range of 150 Hz, which attains a low value of 120 at a frequency of 2 MHz. At the lower frequency side, electric dipoles can respond and follow under the applied electric field, while with the increase of frequency, electric dipoles are unable to respond and follow with the applied ac frequency, which results dielectric constant decreases. , Further, an exponential decrease in dielectric constant with increase of frequency can be ascribed to a contributions of electronic, ionic, and space charge/interfacial polarization. − The enhancement of dielectric constant may be considered as a natural result of the emergence of spontaneous polarization in PVDF foam due to local electric field induced by the CNT. − Furthermore, such large value of dielectric constant as compared to pure PVDF film is due to the rapid increase in the dipole moment per unit volume cause by nanoscale size of PVDF-CNT which act as nano dipoles under the application of electric field. − Variation of dielectric loss (tan δ) with frequency (20 Hz-2 MHz) is shown in Figure b. Dielectric loss tangent also exhibits a similar trend and tan δ of 34.55 was observed at 150 Hz.…”

Section: Resultsmentioning

confidence: 99%

Humidity Sustainable Hydrophobic Poly(vinylidene fluoride)-Carbon Nanotubes Foam Based Piezoelectric Nanogenerator

Badatya

Bharti

Sathish

et al. 2021

ACS Appl. Mater. Interfaces

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Light weight lead free, polymer, and carbon nanotubes based flexible piezoelectric nanogenerators have prompted widespread concern for harvesting mechanical energy and powering next generation electronics devices. Herein, lightweight polyvinylidene fluoride (PVDF)-carbon nanotube (CNT) foam was prepared to fabricate humid resistant hydrophobic flexible piezoelectric nanogenerator to converts mechanical energy into electricity for the first time. Hydrophobic piezoelectric PVDF-CNT foam with density of 0.15 g/cm3 was prepared by solution route. PVDF-CNT foam exhibited crystalline and a well-defined chain likes structure with 65% fraction of β-phase. Self-poled PVDF-CNT foam shows piezoelectric charge coefficient (d33) of 9.4 pC/N. High d33 of PVDF-CNT foam is caused by dipole alignment induced by local electric field of CNT in the microcellular structure of PVDF. The developed foam exhibits ultrahigh dielectric constant (ε′) ∼ 3048 at 150 Hz. Flexible piezoelectric PVDF-CNT foam based nanogenerator was fabricated, which generates high output voltage ∼12 V and current density of 30 nA/cm2 at small compressive pressure of 0.02 kgf. Piezoelectric output performance was measured under different humid condition and an output voltage up to 8 V was achieved even under 60% RH condition. PVDF-CNT foam exhibited hydrophobic behavior and high surface water contact angle of 139°. Such high output voltage even under small pressure, without applying electrical poling and under humid condition was originated though CNT induced self-alignment of electric dipoles in PVDF polymer. These excellent performances of developed foam based device confirmed its potential application in organic based ultrasensitive self-powered nanosensors and nanosystems.

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Section: Resultsmentioning

confidence: 99%

Humidity Sustainable Hydrophobic Poly(vinylidene fluoride)-Carbon Nanotubes Foam Based Piezoelectric Nanogenerator

Badatya

Bharti

Sathish

et al. 2021

ACS Appl. Mater. Interfaces

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“…where C p is the capacitance, 3 o is the permittivity of free space, and d and A are the thickness and area of the sample, respectively. 41 The surface of the sample was coated on both sides with conducting silver paste to form the parallel plate capacitor. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The dielectric constant and dielectric loss of ZnO nanodiscs were investigated in the frequency range of 20 Hz to 2 MHz at room temperature using a high precision LCR meter and the value of the dielectric constant was evaluated using the equation: where C p is the capacitance, ε o is the permittivity of free space, and d and A are the thickness and area of the sample, respectively. 41 …”

Section: Resultsmentioning

confidence: 99%

A high performance flexible two dimensional vertically aligned ZnO nanodisc based piezoelectric nanogenerator via surface passivation

et al. 2020

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“…Multifunctional nanomaterials play an important role in different fields of applied sciences including semiconductor electronics, solar energy, memory devices, and optoelectronics devices for development of efficient nanosensors and nanosystems [ 1 , 2 , 3 , 4 , 5 , 6 ]. Therefore, tailoring of these nanomaterials for their desired properties is extremely important, especially for applications in advanced portable devices [ 7 , 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Highly Crystalline Bi-Functional Mn-Doped Zn2SiO4 Nanostructures by Low-Cost Sol–Gel Process

et al. 2023

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Herein, we demonstrate a process for the synthesis of a highly crystalline bi-functional manganese (Mn)-doped zinc silicate (Zn2SiO4) nanostructures using a low-cost sol–gel route followed by solid state reaction method. Structural and morphological characterizations of Mn-doped Zn2SiO4 with variable doping concentration of 0.03, 0.05, 0.1, 0.2, 0.5, 1.0, and 2.0 wt% were investigated by using X-ray diffraction and high-resolution transmission electron microscopy (HR-TEM) techniques. HR-TEM-assisted elemental mapping of the as-grown sample was conducted to confirm the presence of Mn in Zn2SiO4. Photoluminescence (PL) spectra indicated that the Mn-doped Zn2SiO4 nanostructures exhibited strong green emission at 521 nm under 259 nm excitation wavelengths. It was observed that PL intensity increased with the increase of Mn-doping concentration in Zn2SiO4 nanostructures, with no change in emission peak position. Furthermore, magnetism in doped Zn2SiO4 nanostructures was probed by static DC magnetization measurement. The observed photoluminescence and magnetic properties in Mn-doped Zn2SiO4 nanostructures are discussed in terms of structural defect/lattice strain caused by Mn doping and the Jahn–Teller effect. These bi-functional properties of as-synthesized Zn2SiO4 nanostructures provide a new platform for their potential applications towards magneto-optical and spintronic and devices areas.

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Giant dielectric constant and band gap reduction in hydrothermal grown highly crystalline zinc silicate nanorods

Cited by 20 publications

References 16 publications

Humidity Sustainable Hydrophobic Poly(vinylidene fluoride)-Carbon Nanotubes Foam Based Piezoelectric Nanogenerator

Humidity Sustainable Hydrophobic Poly(vinylidene fluoride)-Carbon Nanotubes Foam Based Piezoelectric Nanogenerator

A high performance flexible two dimensional vertically aligned ZnO nanodisc based piezoelectric nanogenerator via surface passivation

Synthesis and Characterization of Highly Crystalline Bi-Functional Mn-Doped Zn2SiO4 Nanostructures by Low-Cost Sol–Gel Process

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