Browsing by Author "Sruthi, T."

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Anti Cataract Activity of Synthesized Silver Nano Particles from Skin of Allium Cepa Species
(Institute of Physics Publishing helen.craven@iop.org, 2020) Vangalapati, M.; Sruthi, T.; Koteshwara Rao, C.; Surya Prakash, D.V.; Anand Kumar, N.; Monica Nissy, S.; Sasikala, V.
Allium cepa (Onion) is considered as the most used vegetable in the world. The most common disease that turns chronic is the cataract disease. The occurrence of blurry vision which requires a surgery, is major ophthalmic disorder. This paper focuses on the therapeutic application of the flavonoid extract from the skin of Allium Cepa. The extraction of flavonoids from onion peel and their combination with silver particles showed the activity at its rest as nano particles. The "lipid peroxidase" test at the lab were tested against the cataract cell lines, which therefore resulted: only onion peel-1.47 Î¼moles MDA / gmFW; Nano sized skin of Allium cepa-3.25 Î¼moles MDA / gmFW. From the observations, Anti cataract activity of the silver nano particles from skin of Allium cepa showed better results than skin of Allium cepa. The nano particles were analyzed using SEM and XRD. Â© 2020 Published under licence by IOP Publishing Ltd.
Enhanced quantum capacitance in chemically modified graphene electrodes: Insights from first principles electronic structures calculations
(Elsevier B.V., 2021) Sruthi, T.; Tarafder, K.
We have carried out a systematic study of quantum capacitance in functionalized graphenes by using DFT calculations. The graphene functionalization has been done by doping with different aliphatic and aromatic molecules and their radicals. The quantum capacitance of functionalized graphenes was estimated from the accurate electronic band structures of the system obtained by using DFT calculations. Our theoretical investigation reveals that aromatic and aliphatic radicals introduce localized density of states near the Fermi level of the functionalized systems, due to a charge localization. As a result, a very high quantum capacitance (>230?F?cm2) was observed in the system. The effects of atomic dislocation and the vacancy defect on graphene during functionalization has also been incorporated in our investigation. Our study suggests an effective way to synthesize highly efficient graphene-based supercapacitor electrode materials by using aromatic and aliphatic molecule/ radical functionalization of graphene. © 2020 Elsevier B.V.
Enhancement of quantum capacitance by chemical modification of graphene supercapacitor electrodes: a study by first principles
(2019) Sruthi, T.; Tarafder, K.
In this paper, we specify a powerful way to boost quantum capacitance of graphene-based electrode materials by density functional theory calculations. We performed functionalization of graphene to manifest high-quantum capacitance. A marked quantum capacitance of above 420?Fcm-2 has been observed. Our calculations show that quantum capacitance of graphene enhances with nitrogen concentration. We have also scrutinized effect on the increase of graphene quantum capacitance due to the variation of doping concentration, configuration change as well as co-doping with nitrogen and oxygen ad-atoms in pristine graphene sheets. A significant increase in quantum capacitance was theoretically detected in functionalized graphene, mainly because of the generation of new electronic states near the Dirac point and the shift of Fermi level caused by ad-atom adsorption. 2019, Indian Academy of Sciences.
Enhancement of quantum capacitance by chemical modification of graphene supercapacitor electrodes: a study by first principles
(Indian Academy of Sciences, 2019) Sruthi, T.; Tarafder, K.
In this paper, we specify a powerful way to boost quantum capacitance of graphene-based electrode materials by density functional theory calculations. We performed functionalization of graphene to manifest high-quantum capacitance. A marked quantum capacitance of above 420?Fcm-2 has been observed. Our calculations show that quantum capacitance of graphene enhances with nitrogen concentration. We have also scrutinized effect on the increase of graphene quantum capacitance due to the variation of doping concentration, configuration change as well as co-doping with nitrogen and oxygen ad-atoms in pristine graphene sheets. A significant increase in quantum capacitance was theoretically detected in functionalized graphene, mainly because of the generation of new electronic states near the Dirac point and the shift of Fermi level caused by ad-atom adsorption. © 2019, Indian Academy of Sciences.
Route to achieving enhanced quantum capacitance in functionalized graphene based supercapacitor electrodes
(2019) Sruthi, T.; Kartick, T.
We have investigated the quantum capacitance (CQ) in functionalized graphene modified with ad-atoms from different groups in the periodic table. Changes in the electronic band structure of graphene upon functionalization and subsequently the CQ of the modified graphene were systematically analyzed using density functional theory (DFT) calculations. We observed that the CQ can be enhanced significantly by means of controlled doping of N, Cl and P ad-atoms in the pristine graphene surface. These ad-atoms are behaving as magnetic impurities in the system, generating a localized density of states near the Fermi energy which, in turn, increases charge (electron/hole) carrier density in the system. As a result, a very high quantum capacitance was observed. Finally, the temperature dependent study of CQ for Cl and N functionalized graphene shows that the CQ remains very high in a wide range of temperatures near room temperature. 2019 Institute of Physics Publishing. All rights reserved.
Route to achieving enhanced quantum capacitance in functionalized graphene based supercapacitor electrodes
(Institute of Physics Publishing helen.craven@iop.org, 2019) Sruthi, T.; Tarafder, K.
We have investigated the quantum capacitance (CQ) in functionalized graphene modified with ad-atoms from different groups in the periodic table. Changes in the electronic band structure of graphene upon functionalization and subsequently the CQ of the modified graphene were systematically analyzed using density functional theory (DFT) calculations. We observed that the CQ can be enhanced significantly by means of controlled doping of N, Cl and P ad-atoms in the pristine graphene surface. These ad-atoms are behaving as magnetic impurities in the system, generating a localized density of states near the Fermi energy which, in turn, increases charge (electron/hole) carrier density in the system. As a result, a very high quantum capacitance was observed. Finally, the temperature dependent study of CQ for Cl and N functionalized graphene shows that the CQ remains very high in a wide range of temperatures near room temperature. © 2019 Institute of Physics Publishing. All rights reserved.
Theoretical investigation of quantum capacitance in the functionalized MoS2-monolayer
(IOP Publishing Ltd, 2021) Sruthi, T.; Devaraj, N.; Tarafder, K.
In this work, we investigated the electronic structure and the quantum capacitance of a set of functionalized MoS2 monolayers. The functionalizations have been done by using different ad-atom adsorption on MoS2 monolayer. Density functional theory calculations are performed to obtain an accurate electronic structure of ad-atom doped MoS2 monolayer with a varying degree of doping concentration. Subsequently, the quantum capacitance in each functionalized system was estimated. A marked quantum capacitance above 200 ?F cm-2 has been observed. Our calculations show that the quantum capacitance of MoS2 monolayer is significantly enhanced with substitutional doping of Mo with transition metal ad-atoms. The microscopic origin of such enhancement in quantum capacitance in this system has been analyzed. Our DFT-based calculation reveals that the generation of new electronic states at the proximity of the band-edge and the shift of Fermi level caused by the ad-atom adsorption results in a very high quantum capacitance in the system. © 2021 Institute of Physics Publishing. All rights reserved.