Faculty Publications
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Publications by NITK Faculty
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Item Self-assembly synthesis of Co3O4/multiwalled carbon nanotube composites: An efficient enzyme-free glucose sensor(Royal Society of Chemistry, 2015) Prasad, R.; Badekai Ramachandra, B.R.Self-assembled cobalt oxide-multiwalled carbon nanotube composites were synthesized by simple and effective wet chemical routes. Using these materials, a modified glassy carbon electrode was fabricated and investigated for enzyme-free glucose sensor applications. The fabricated sensor exhibited a high sensitivity of 5089.1 ?A mM-1 cm-2 with a detection limit of 10.42 ?M over a glucose concentration ranging from 0.05 to 12 mM. The sensor also shows promising sensor features like stability, selectivity and fast detection. Moreover, the detection of glucose in human blood serum samples with the as-developed sensor agreed well with the results obtained from commercial glucose meters. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.Item Aggregative ways of graphene quantum dots with nitrogen-rich edges for direct emission spectrophotometric estimation of glucose(Elsevier B.V., 2019) Mishra, P.; Badekai Ramachandra, B.R.We report a facile one step in-situ synthesis of amino-functionalized graphene dots. These quantum dots were employed for the detection of glucose in both standard aqueous solutions and commercially available fruit juice to assess its practicability. The characterization of the quantum dots revealed that they were decorated with amine functionality. Additionally, the interaction between glucose and amine functionalized graphene quantum dots gave enhancement in the UV–vis absorption and photoluminescence (PL) due to aggregation of quantum dots via glucose link. Therefore, the quantum dots were able to detect the concentration of glucose in solution exhibiting linearity from 0.1 to 10 mM and 50–500 mM with a sensitivity transition from 10 mM to 50 mM. The limit of detection for the determination of glucose was found to be 10 ?M. This determination was agreed from both UV–Vis absorption and PL spectroscopy. However, the PL emission method of determination was most suited with its very high accuracy of 98.04 ± 1.96% and 97.33 ± 2.67% for the linear range of glucose concentration within 0.1–10 mM and 50–500 mM, respectively. The PL enhancement was highly selective towards glucose in mixture of other form of sugars making it suitable for determining glucose in food samples. © 2019