Browsing by Author "Rama Devi"

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Flexible printed paper electrode with silver nano-ink for electrochemical applications
(Elsevier Inc., 2020) Tushar Kant; Kamlesh Shrivas; Vellaichamy Ganesan; Yugal Kishor Mahipal; Rama Devi; Manas Kanti Deb; Ravi Shankar
Development of low-cost paper based disposable electrodes printed with silver nano-ink using desktop inkjet printer is reported in this work. A stable nano-ink was prepared by dissolving 3% silver nanoparticles (AgNPs) capped with polyvinylpyrrolidone (PVP) in ethanol as a dispersing solvent. Highly stable silver nano-ink with surface tension of 21.1 mN/M and viscosity of 2.6 mPa.S was prepared for printing on photo paper that can be used as an electrode for electrochemical analyses. The fabricated paper electrode was exploited as a counter electrode in cyclic voltammetry (CV) analysis of potassium ferricyanide with better stability and reproducibility (relative standard deviation (RSD) 1.6%) for multiple times of analyses (n = 60) and compared with the results of conventional electrodes. Further, the printed paper electrode was demonstrated to be used as a working electrode for analysis of nitrate by CV. The use of paper electrode is found to be simple, rapid, user-friendly and can be applied at the sample source for determination of nitrate from different samples. © 2020 Elsevier B.V.
Inkjet-printed paper-based electrochemical sensor with gold nano-ink for detection of glucose in blood serum
(Royal Society of Chemistry, 2021) Tushar Kant; Kamlesh Shrivas; Kavita Tapadia; Rama Devi; Vellaichamy Ganesan; Manas Kanti Deb
Herein, an inkjet-printed paper electrode (PPE) with gold nanoparticle (AuNP)-ink as a non-enzymatic electrochemical sensor for detection of glucose in blood serum is reported. In this work, a green method is used for the synthesis of the aqueous AuNP-ink and the electrode is fabricated on a paper substrate using an office desktop inkjet-printer. The developed AuNP-ink is stable and has a surface tension and viscosity of 70.2 mN m-1 and 2.1 mPa s (2% aqueous AuNP ink). The PPE with AuNPs is sintered at 100 °C for 30 min to obtain a conductive film for electrochemical sensing. The prepared AuNP-PPE is employed as a working electrode in cyclic voltammetry (CV) for the sensitive measurement of glucose in blood serum. The fabricated AuNP-PPE demonstrated excellent electrochemical activity and rapid electron transfer kinetics towards the oxidation of glucose. A wide linear range, 0.05-35 mM, with a limit of detection of 10 μM is observed for the determination of glucose. The advantages of using the AuNP-PPE in electrochemical measurements are that it is flexible, user-friendly, biodegradable, economic and enzyme-free with respect to the commercially available electrochemical sensors. © 2021 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.