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Nath A.,Assam University | Nath A.,G C College | Purkayastha D.D.,Assam University | Sharon M.,search Center For Nanotechnology And Bio Nanotechnology | Bhattacharjee C.R.,Assam University
Materials Letters | Year: 2015

Multiwalled carbon nanotubes (MWCNTs) have been synthesized at low temperature on silicon substrates in a thermal chemical vapor reactor from ghee, clarified butter from cows milk as the carbon source without using any catalyst. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analyses revealed bundles of micrometer long MWCNTs with an interlayer separation of 0.33 nm consisting of 25 concentric graphene sheets with outer and inner diameters of 27.45 and 13.68 nm, respectively. The powder X-ray diffraction (XRD) pattern showed a hexagonal structure of graphitic carbon with average crystallite size of 4.6 nm. The MWCNTs exhibited pronounced antioxidant activity. © 2015 Elsevier B.V. All rights reserved. Source


Sharma N.,search Center For Nanotechnology And Bio Nanotechnology | Mishra N.,search Center For Nanotechnology And Bio Nanotechnology | Sharon M.,search Center For Nanotechnology And Bio Nanotechnology
AIP Conference Proceedings | Year: 2013

Carbon synthesized from corn-cob has been used as an electrode in Electrochemical Double Layer Capacitor (EDLC). Dried Corn Cobs, soaked in 1N KOH, 1N HCl or 5% ZnCl2 at 10 0°C for 24 hr, were pyrolyzed in presence of Ar using Co as catalyst at 700-900 °C having dwell time of 60-180 min. The morphology of thus obtained carbon was studied under SEM that showed it to be porous carbon. All the carbon samples synthesized using different parameters were used as electrode for EDLC. Cyclic Voltammetry was used to measure the capacitance. Carbon synthesized from corn cobs pre-treated with 5% ZnCl2 using Co as catalyst pyrolyzed at 700°C for a dwell time of 120 min gave higher Specific capacitance of 270 F/g at scan rate of 5 mV/s. Moreover, this carbon, as observed under SEM, exhibited larger pore size. © 2013 AIP Publishing LLC. Source


Phadke C.,search Center For Nanotechnology And Bio Nanotechnology | Mewada A.,search Center For Nanotechnology And Bio Nanotechnology | Dharmatti R.,search Center For Nanotechnology And Bio Nanotechnology | Thakur M.,search Center For Nanotechnology And Bio Nanotechnology | And 3 more authors.
Journal of Fluorescence | Year: 2015

Synthesis of fluorescent Carbon Dots (CDs) from various carbonaceous materials apparently has acquired lots of interest amongst researchers as the corollary of the properties of CDs; which are subsequently getting unveiled. In this study we report the use of Azadirachta indica (Neem) Gum as a novel natural pre-cursor for synthesis of CDs at room temperature. Water soluble CDs of around 5-8 nm were obtained after treatment of the gum with ethanol and NaOH. These CDs exhibited green fluorescence in UV-light (λ = 365 nm). These CDs were found to be stable, having many bio-linkers attached on their surface, making it suitable for drug attachment and hence can serve as potential candidates for applications like drug delivery vehicles as well as for biosensors. © 2015 Springer Science+Business Media. Source


Mewada A.,search Center For Nanotechnology And Bio Nanotechnology | Vishwakarma R.,search Center For Nanotechnology And Bio Nanotechnology | Vishwakarma R.,Nagoya Institute of Technology | Patil B.,search Center For Nanotechnology And Bio Nanotechnology | And 3 more authors.
Carbon Letters | Year: 2015

Bio-imaging and drug carriers for delivery have created a huge demand for crystals. Crystals are fascinating materials that have been grown for a long time but obtaining biocompatible fluorescent crystals is a challenging task. We report on the growth of fluorescent crystals using a carbon dot (C-dot) solution by a hydrothermal process. The crystallization pattern of these C-dots exhibited a unique dendritic structure having a feather-like morphology. The growth temperature and pressure were maintained at 60°C and 200 mmHg, respectively, for crystal growth. A green fluorescence (under UV light) that was observed in the C-dot solu­tion was retained in the crystals formed from the solution. Cytotoxicity studies on Vero cells revealed the crystals to be extremely biocompatible. These fluorescent crystals are extremely well suited for biomedical and optoelectronic applications. © Korean Carbon Society. Source


Pandey S.,search Center For Nanotechnology And Bio Nanotechnology | Mewada A.,search Center For Nanotechnology And Bio Nanotechnology | Oza G.,search Center For Nanotechnology And Bio Nanotechnology | Thakur M.,search Center For Nanotechnology And Bio Nanotechnology | And 2 more authors.
Nanoscience and Nanotechnology Letters | Year: 2013

We are reporting novel protocol for the synthesis of Carbon dots (C-dots) at 28±2 °C using Sugar cane juice without any additive. To separate C-dots from other carbonaceous materials, we exploited Sucrose Density Gradient Centrifugation (SDGC). Discrete fractions obtained were studied for the presence of C-dots using UV-Vis spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), High Resolution Transmission Electron Microscopy (HRTEM), X-ray diffraction (XRD) and Raman Spectroscopy. Copyright © 2013 American Scientific Publishers All rights reserved. Source

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