Gounder Thangamani J.; Kalim Deshmukh; Kishor Kumar Sadasivuni; K. Chidambaram; M. Basheer Ahamed; Deepalekshmi Ponnamma; Mariam Al-Ali AlMaadeed; S. K. Khadheer Pasha
Abstract
Graphene and carbon nanotubes (CNTs) based sensors have been extensively studied because of their applications in the detection of various chemicals and biomolecules. From an application point of view, high sensitivity and selectivity is a promising tool for fast detection of gas leakage and early diagnosis ...
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Graphene and carbon nanotubes (CNTs) based sensors have been extensively studied because of their applications in the detection of various chemicals and biomolecules. From an application point of view, high sensitivity and selectivity is a promising tool for fast detection of gas leakage and early diagnosis of diseases for health care. In the present review article, we provide a comprehensive overview on the recent advances in the development of graphene and CNT based electrochemical biosensors and gas sensors. From the future point of view, special attention is paid to the synthesis techniques for high-performance biosensors and gas sensors. This article focuses on detecting mechanism for various volatile organic compounds (VOCs) gas sensing behavior of the graphene and CNT based sensors. A comparative study of the sensing behavior of pure metal oxide nanoparticles as well as their hybrids with graphene and CNTs has been reported.
Kumar Digvijay Satapathy; Kalim Deshmukh; M. Basheer Ahamed; Kishor Kumar Sadasivuni; Deepalekshmi Ponnamma; S. K. Khadheer Pasha; Mariam Al-Ali AlMaadeed; Jamil Ahmad
Abstract
Herein, we report the synthesis of poly (vinylidene fluoride) (PVDF) based novel nanocomposites reinforced with graphene nanoplatelets (GNP) and vanadium pentoxide (V2O5) as nanofillers. The PVDF/V2O5/GNP nanocomposite films were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray ...
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Herein, we report the synthesis of poly (vinylidene fluoride) (PVDF) based novel nanocomposites reinforced with graphene nanoplatelets (GNP) and vanadium pentoxide (V2O5) as nanofillers. The PVDF/V2O5/GNP nanocomposite films were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), polarized optical microscopy (POM) and scanning electron microscopy (SEM). The electrical properties of nanocomposites were investigated to ascertain the synergistic effect of fillers on the quality factor (Q-factor) of nanocomposites. The FTIR and XRD results infer good interaction between PVDF and V2O5 and the good dispersion of nanofillers in the PVDF matrix. The TGA results revealed that the thermal stability of PVDF/V2O5/GNP nanocomposite has improved at higher loading of nanofillers due to the good interaction between the nanofillers and the polymer matrix. The electrical analysis of nanocomposite films demonstrates high Q-factor value (1099.04) at 4.7 wt % V2O5 and 0.3 wt % GNP loading. With further increase in GNP loading to 1 wt %, the Q-factor becomes lower (356.52) which could be due to the enhanced conductivity of the samples. The significant enhancement in the value of Q-factor shows that the nanocomposites can be used as a potential candidate for high-Q capacitor applications.
M. K. Mohanapriya; Kalim Deshmukh; M. Basheer Ahamed; K. Chidambaram; S. K. Khadheer Pasha
Abstract
Zeolite 4A nanoparticles were incorporated into Poly (3, 4 - ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS) and Polyvinyl alcohol (PVA) blend matrix to prepare PEDOT: PSS/PVA/Zeolite 4A nanocomposites using solution casting technique. The structure and morphology of nanocomposites were ...
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Zeolite 4A nanoparticles were incorporated into Poly (3, 4 - ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS) and Polyvinyl alcohol (PVA) blend matrix to prepare PEDOT: PSS/PVA/Zeolite 4A nanocomposites using solution casting technique. The structure and morphology of nanocomposites were examined using Fourier transform infrared spectroscopy, X-ray diffraction, UV-Vis spectroscopy and Scanning electron microscopy. The mechanical and dielectric properties of nanocomposites were also evaluated. The FTIR and XRD results indicate the strong interaction between the Zeolite 4A nanoparticles and the polymer matrix. The SEM micrographs show the homogeneous dispersion of Zeolite 4A into the polymer matrix. The nanocomposite exhibits a high dielectric constant and low dielectric loss, which could be due to proper dispersion and good interaction between Zeolite 4 A and polymer matrix. Thus, based on the results obtained it can be concluded that PEDOT: PSS/PVA/Zeolite 4A nanocomposites can be used as a flexible dielectric material for embedded capacitor applications.
Mayank Pandey; Girish M. Joshi; Kalim Deshmukh; Jamil Ahmad
Abstract
Polyvinyl alcohol (PVA) and Polyvinyl Pyrrolidone (PVP) based polymer electrolytes for different loading wt% of CdCl2 were prepared by solution casting. The structural complexation was confirmed and interlayer spacing (d) was evaluated by using X-ray diffraction (XRD) study. The chemical bonding between ...
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Polyvinyl alcohol (PVA) and Polyvinyl Pyrrolidone (PVP) based polymer electrolytes for different loading wt% of CdCl2 were prepared by solution casting. The structural complexation was confirmed and interlayer spacing (d) was evaluated by using X-ray diffraction (XRD) study. The chemical bonding between polymer and salt was identified by using Fourier transform infrared spectroscopy (FTIR) technique. The FTIR peak at 3402.43 cm -1 in addition of PVP in PVA/CdCl2 composite demonstrates the grafting between two polymers. The presence of ionic bright channels and variation in morphology for different loading wt% of CdCl2 was confirmed by scanning electron microscope (SEM) and was also verified by Atomic force microscopy (AFM) micrographs. The analysis of impedance spectroscopy represented by semicircular pattern is driven by conduction mechanism and correlated with electrical conductivity. The enhanced AC conductivity of polymer electrolyte is directly proportional to frequency (50Hz-1MHz). The maximum value of DC conductivity 1.65x10 -5 S/m evaluated from Arrhenius plots and attribute to high mobility of free charges at higher temperature. The evaluated results of structural, morphological and electrical properties of present composites make the present research good for electrochemical devices.