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- 저자 : Das Sayan (검색결과 5 건)
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Sayan Ganguly,Subhadip Mondal,Poushali Das,Poushali Bhawal,Tushar Kanti Das,Sabyasachi Ghosh,Sanjay Remanan,Narayan Chandra Das 한국고분자학회 2019 Macromolecular Research Vol.27 No.3
Dispersion of graphene as nano-building block in polymer matrix is challenging for developing high strength polymer nanocomposites. Tuning of surface polarity can be an effective pathway to resolve this issue of dispersion. Besides this, the polymer matrix (Ethylene methyl acrylate or EMA) has been chosen here judicially due to its polar-nonpolar alternating copolymeric segments which indirectly facilitated dispersion of nanofillers. Herein, graphene oxide has been lyophilically modified by virtue of surface grafting phenomenon with the help of di-halo substituted silane. The most surprising outcome which has been nurtured is their superior dispersion, improvement in physico-mechanical features, and transparency without affecting the inherent compliance of pristine polymer. The transmission electron microscopic image of silane functionalized graphene oxide (GOF) is showing surface roughness which has immense effect of physisorption and mechanical anchoring of polymer chains over GOF nano-sheets. Such physical interaction has enough impact on mechanical properties which has been discussed here. Moreover, the deterioration of transparency was not so much affected after loading of GOF filler. The filler distribution also has been confirmed in the light of small angle X-ray scattering (SAXS) study. Thermal treatment has been conducted for composites which accounted high thermal stability comparatively to pristine polymer.
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Sabyasachi Ghosh,Sayan Ganguly,Poushali Das,Tushar Kanti Das,Madhuparna Bose,Nikhil K. Singha,Amit Kumar Das,Narayan Ch. Das 한국섬유공학회 2019 Fibers and polymers Vol.20 No.6
Conductive filler loading in the polymer matrix is a common practice to transform insulative polymers toconducting composites. In case of textiles, the highly promising approach has been coined by virtue of fabricating withconductive adhesive homogeneous coating. The present fabrication approach has been developed by two-stage wet mixingtechnique including synthesis of silver nanoparticles decorated graphene sheets (rGO/Ag), followed by the preparation ofconducting coating by non-ionic polymer adhesive. The novelty lies in the choice of conductive material and coating strategyto make lightweight and flexible smart electronic fabric. In order to protect the radiation pollution from the immense use ofelectronic devices and gadgets, the coated textiles can be an excellent replacement of other commercially available polymercoatings. The electromagnetic interference (EMI) shielding effectiveness of the prepared coated textile was 27.36 dB in the Xband (8.2-12.4 GHz). Besides this it is worth mentioning that our developed coated fabric was enough conductive to light upa series of 57 LEDs with high intensity. Last but not the least this work also reconnoitres bactericidal feature against E. coli.
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C60 embedded diamond-like nanocomposite thin film
Jana Sukhendu,Das Sayan,De Debasish,Shakti Nanda,Mondal Anup,Bhattacharya Sekhar,Gongopadhyay Utpal 한국탄소학회 2022 Carbon Letters Vol.32 No.1
Diamond-like nanocomposite (DLN) has become a promising thin film for many fields of applications due to its unique and tunable properties. However, low optical bandgap and thermal stability limits its application in many fields particularly as antireflection coating on solar cell. In the present study, the DLN thin film has been deposited using a mixed liquid precursor by rf-PECVD process. Surprisingly the presence of nc-C60 in FCC structure in DLN matrix has been observed. The degree of crystallinity and diameter of C60 have been increased significantly after annealed at 850 °C. The film has been annealed at 850 °C to primarily investigate its feasibility as antireflection coating (ARC) in compatible with industrial solar cell fabrication process. The refractive index and optical bandgap of the film were around 1.80 and 4.10 eV, respectively. Moreover, the optical bandgap has decreased to some extent to 3.92 eV even after annealing at such high temperature. The high SiOx at% and embedded nc-C60 enhanced the optical transparency and thermal stability of the DLN film. The solar-weighted average reflection of DLN-coated textured silicon was reduced significantly to 1.91%. The C60 embedded DLN film has a great potential to apply in different optoelectronic devices especially in solar cell as ARC.
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Bhattacharya Gourab,Das Sayan,Venimadhav A. 한국물리학회 2023 Current Applied Physics Vol.49 No.-
In this work, we report for the first time, the effect of adding ZnO nanoparticles, and NdCl3(6H2O) into solution cast Poly (vinylidene fluoride) (PVDF) films, and the interplay of these two different types of additives giving rise to unique multifunctional properties. Rather than the dominance of a single type of additive, a balanced amount of ZnO and NdCl3(6H2O) enhanced the crystallinity, electroactive phase formation, dielectric, ferroelectric and piezoelectric properties of the films. These enhanced properties of the film, having the optimum amount of both the additives, have been utilized to fabricate a device capable of harvesting electrical energy from different body movements though the enhanced electroactive nature of the thin film. A very low cost flexible piezoelectric energy harvester has been prepared from the optimized film. The device shows excellent periodic performance under several human body imparted forces like finger tapping, toe pressing etc. The maximum open circuit voltage was obtained to be 5.9 V and short circuit current was obtained to be 0.36 μA resulting in a power density of 0.35 μW/cm2 against periodic human finger tapping. The device has been observed to be sensitive to other body movements and also has been proven to be efficient for extracting power from different body movements.
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Sabyasachi Ghosh,Subhadip Mondal,Sayan Ganguly,Sanjay Remanan,Nikhil Singha,Narayan Ch. Das 한국섬유공학회 2018 Fibers and polymers Vol.19 No.5
Herein, an intelligent cotton fabric was fabricated using a non-ionic surfactant based macro structured carbonaceous coating through the ‘knife-over-roll’ technique. The developed novel fabric was tested as flexible, mechanically robust with prolonged chemical/moisture resistance. Various characterization techniques were thoroughly used to analyze the fabric. The as-prepared fabric shows an outstanding electromagnetic interference (EMI) shielding efficiency (SE) of about 21.5 dB even at the lowest possible coating thickness (0.20 mm) where the highest EMI SE of 30.8 dB is obtained at only 0.30 mm coating thickness over the X-band frequency range (8.2-12.4 GHz), possibly due to the threedimensionally interconnected network structure of conducting carbon particles. The micro-computed tomography disclosed the porous architecture and “void-filler” arrangement within the fabrics. For the betterment of serviceability and practicability of the coated fabric, the water tolerance and contact angle studies were conducted. The relatively high contact angle than pure cotton fabric, and excellent water resistance after coating ensure improved endurance for external or industrial uses. Therefore, this proof-of-construct manifests commercialization of the developed fabric for multipurpose applications in a facile, less-hazardous and economical way.
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