Dielectric investigation of a conducting fibrous nonwoven porous mat fabricated by a one-step facile electrospinning process

Tahalyani, Jitendra; Rahangdale, Khushbu K.; Aepuru, Radhamanohar; Kandasubramanian, Balasubramanian; Datar, Suwarna

doi:10.1039/c5ra23012h

Cited by 74 publications

(36 citation statements)

References 72 publications

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“…Identical, frequency‐dependent intense peak was detected by Tahalyani et al . for fibrous mat, results due to nonhomogenous distribution (i.e., confined in some zone and dispersed in others) of EM field intensity in nanofiberous materials which can be concluded from transmitted and reflected wave interference . Salimbeygi et al .…”

Section: Resultsmentioning

confidence: 99%

Investigation of dielectric properties of free standing electrospun nonwoven mat

Tahalyani

Datar

Kandasubramanian

2017

J of Applied Polymer Sci

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Flexible materials with balanced dielectric as well as conductive characteristics have elucidated considerable demand in field of research where conventional dielectric or insulators can be replaced by recent advances in various electronics appliances. Our work describes the detailed analyses of dielectric properties like dielectric constant, losses, and electric modulus by means of broadband dielectric spectroscopy over frequency ranging from 0.1 Hz to 10 MHz and temperature ranging from 0 to 60 8C for poly(vinyl alcohol)-polyaniline (PVA-PANI) free standing electrospinning nonwoven mat. It has been contemplated that the dielectric constant was enhanced by increasing PANI concentration for complete range of frequency at room temperature. The enhanced dielectric constant value (5.14 at 0.1 Hz, 2.66 at 1 KHz, 2.58 at 10 KHz, and 2.19 at 10 MHz) was anticipated for 7 wt % loading of PANI which was attributed to the presence of dipoles and interfacial polarization enclosed by the polymers. The increased dielectric constant with PANI dosing as well as with temperature attributed to favorable interfacial polarization. Shifting of peak is noticed in the spectra of imaginary electric modulus with increase in temperature which indicates increased chain dynamics of polymers in the mat. Three-dimensional analysis of the field emission scanning electron microscopy images was carried out by SPIP analytical software.

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Section: Resultsmentioning

confidence: 99%

Investigation of dielectric properties of free standing electrospun nonwoven mat

Tahalyani

Datar

Kandasubramanian

2017

J of Applied Polymer Sci

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“…Generally, if the signal electromagnetic environment is primarily considered, the EMI SE of shielding materials required for practical applications, such as mobile phones and laptop computers, is approximately 20 dB. [ 24,44,45 ] The EMI SE of the composite film in the frequency range from 1 to 12 GHz is measured to be 30.5 dB even at the lowest Ag NW area density of 187 mg m −2 (optical transmittance at 91.0%), which is higher than those reported previously. [ 30,31 ] As the area density of Ag NW becomes larger, the EMI SE of the composite film is quickly increased (Figure 3d).…”

Section: Resultsmentioning

confidence: 94%

Highly Uniform and Stable Transparent Electromagnetic Interference Shielding Film Based on Silver Nanowire–PEDOT:PSS Composite for High Power Microwave Shielding

Qin

Yan

Fan

et al. 2020

Macro Materials & Eng

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Electromagnetic interference (EMI) shielding materials, especially ones with excellent shielding effectiveness (SE), high optical transmittance, long‐term stability as well as high uniformity, are urgently desired to meet the requirements of many applications. Herein, an extremely transparent, stable and uniform silver nanowire (Ag NW)–poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite film as an EMI shielding material is prepared, which possess excellent shielding capability to both small signal and high power microwaves (HPM). The composite film exhibits SE of 30.5 dB in the frequency range of 1–12 GHz (small signal) and simultaneously has an optical transmittance of 91.0%. The SE continuously increases to 41.4 dB, while the optical transmittance still maintains at 81.1%. The composite film is very uniform, and its SE is almost unchanged even when exposed in air for a year. The SE of this composite film under the excitation of HPM is also thoroughly investigated. The HPM SE is much larger than that of small signal. As the power density of HPM is increased, the SE firstly remains unchanged, then continuously increases, and finally saturates. The SE exceeds 50 dB with the excitation power density of 40 W. More interestingly, the SE is saturated at a fixed HPM power density.

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“…Due to each of the characteristics, AuNP has sought tremendous interest of scientists to develop unusual sensing strategies with augmented selectivity and sensitivity toward target analyte. With high surface energy and surface to volume ratio, AuNPs provide persistent immobilization of great amount of biomolecule preserving their biological activity along with direct and fast electron transfer during biochemical reaction between the biomolecule and electrode due to their unique conductive property thus acting as “electron wires.”…”

Section: Intrinsically Conductive Polymer Composites For Biosensing Amentioning

confidence: 99%

Progress in the Development of Intrinsically Conducting Polymer Composites as Biosensors

Prajapati

Kandasubramanian

2019

Macro Chemistry & Physics

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104

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Biosensors are analytical devices which find extensive applications in fields such as the food industry, defense sector, environmental monitoring, and in clinical diagnosis. Similarly, intrinsically conducting polymers (ICPs) and their composites have lured immense interest in bio‐sensing due to their various attributes like compatibility with biological molecules, efficient electron transfer upon biochemical reactions, loading of bio‐reagent, and immobilization of biomolecules. Further, they are proficient in sensing diverse biological species and compounds like glucose (detection limit ≈0.18 nm), DNA (≈10 pm), cholesterol (≈1 µm), aptamer (≈0.8 pm), and also cancer cells (≈5 pm mL−1) making them a potential candidate for biological sensing functions. ICPs and their composites have been extensively exploited by researchers in the field of biosensors owing to these peculiarities; however, no consolidated literature on the usage of conducting polymer composites for biosensing functions is available. This review extensively elucidates on ICP composites and doped conjugated polymers for biosensing functions of copious biological species. In addition, a brief overview is provided on various forms of biosensors, their sensing mechanisms, and various methods of immobilizing biological species along with the life cycle assessment of biosensors for various biosensing applications, and their cost analysis.

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Dielectric investigation of a conducting fibrous nonwoven porous mat fabricated by a one-step facile electrospinning process

Abstract: Currently, there is a considerable demand for materials with inter-balanced dielectric properties to replace the existing traditional insulators in variegated electronic appliances over the range of audio and radio frequency.

Cited by 74 publications

References 72 publications

Investigation of dielectric properties of free standing electrospun nonwoven mat

Investigation of dielectric properties of free standing electrospun nonwoven mat

Highly Uniform and Stable Transparent Electromagnetic Interference Shielding Film Based on Silver Nanowire–PEDOT:PSS Composite for High Power Microwave Shielding

Progress in the Development of Intrinsically Conducting Polymer Composites as Biosensors

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