Browsing by Author "Bharathi, K.D."

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    Development and characterization of Cu/MWCNT composite prepared by electrodeposition technique
    (American Institute of Physics Inc. subs@aip.org, 2020) Bharathi, K.D.; Rahman, M.R.; Choudhary, S.; Arya, S.B.
    Multi walled carbon nanotube (MWCNT) reinforced copper matrix (Cu/MWCNTs) nanocomposites were successfully fabricated by electrodeposition technique using DC-Power source. With various concentrations of CNT, microstructural, micro hardness, tensile stress, and Electrochemical studies were done. The Cu/MWCNT nanocomposites at the highest concentration of 450mg/l exhibited ∼25% and 47% higher tensile strength and Vickers microhardness respectively than that of the pure Cu. Electrochemical AC-impedance and Tafel polarisation analyses confirmed that the corrosion potential (Ecorr) and corrosion current density (icorr) of nanocomposites at 450 «mg/l obtained about 190 »mV SCE and 1.09 μ A/cm2 respectively in 3.5 wt.% NaCl solution. © 2020 Author(s).
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    Flexible and cost effective CNT coated cotton fabric for CO gas sensing application
    (Elsevier B.V., 2023) D.s, A.K.; Chauhan, S.S.; Krishnamoorthy, K.; P, D.B.; Bharathi, K.D.; Ravikumar, A.; Rahman, M.R.
    In this paper, a low-cost and room temperature flexible carbon monoxide (CO) gas sensor is presented using multi-walled carbon nanotubes coated cotton fabric. A dip and drying method is used to fabricate a lightweight, and high-performance fabric based CO gas sensor using different concentrations of multi-walled carbon nanotubes (MWCNTs). Transmission electron microscopy (TEM) is utilized for examining the deagglomeration of MWCNTs in the presence of a sufficient amount of surfactant. The field-emission scanning electron microscopy (FESEM) is used to evaluate the formation of a uniform network of MWCNTs on the cotton fabric. Fourier transform infrared (FTIR) spectroscopy is used to confirm the presence of functional groups which plays an important role in CO gas sensing. The fabricated cotton fabric coated with MWCNTs (CCM) sensors are tested with different concentrations of CO gas ranging from 25 ppm to 100 ppm at room temperature. It is found that in comparison to all other sensors, the CCM sensor coated with the higher concentration of MWCNTs (0.5 mg/ml) shows a maximum response of 9.11 % at 25 ppm and 15.2 % at 100 ppm concentration of CO gas respectively. The CCM 4 sensor shows the fastest response and recovery within 49s for 25–100 ppm of CO gas. Moreover, the fabricated CCM sensor exhibited good repeatability, reproducibility, and selectivity. These sensors are suitable for low-cost smart textile applications. © 2023 Elsevier B.V.
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    Optimized Heat Transfer Rate in Cu/CNT Nano Composite Prepared by Electrodeposition Technique
    (Institute of Physics, 2023) Bharathi, K.D.; Rahman, M.R.; Yadav, A.K.; B.V., B.V.; Bhat Panemangalore, P.
    Highlights The Cu/CNT nanocomposites are successfully through electrodeposition technique. The composites fabricated with different diameters and concentrations of CNTs. The heat transfer rate measured and optimized CNT diameter in Cu/CNT composites. Optimization of CNT concentration in Cu/CNT composites. SEM micrographic features also carry the signature of in plane CNTs deposition. © 2023 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited
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    The cohesion strength of electrodeposited Zn/GO nanocomposite coating on stainless steel
    (Elsevier Ltd, 2025) Bharathi, K.D.; Udaya Bhat, K.; Bhat Panemangalore, P.; Arun Kumar, D.S.; Rahman, M.R.
    Graphene based nanocomposite coatings have incredible scope in enhancing the physical properties of composite materials. In this study, pure Zn and Zn/GO nanocomposite coatings were successfully prepared by electrodeposition technique on the SS304 stainless steel. The Zn/GO nanocomposite coatings were prepared by varying concentration of GO, coating time and CTAB ratio. The nanocomposite coatings were characterized by using the Field emission scanning electron microscopy (FESEM), X-ray diffractometry (XRD), Energy-dispersive X-ray spectroscopy (EDS), and Raman spectroscopy. Cohesion strength (LC) using scratch test at RT noticed that the LC values increased with the concentration of GO. The scratch tests revealed that Zn/GO composite produced using 40 mgL?1 GO had 70 % increase in cohesion strength (LC1) in comparison to pure Zn coating deposited with 30 min of coating time at a ratio of 1:2 GO:CTAB. The magnitude of the residual stress in the nanocomposite coating decreases from ?32 MPa (0 mgL?1 of GO) to ?11 MPa (40 mgL?1 of GO) as the GO concentration increases in coatings due to the effect of the kinetic movement of particles while deposition. © 2024