Browsing by Author "Archana Ghosale"

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A low-cost screen printed glass electrode with silver nano-ink for electrochemical detection of H2O2
(Royal Society of Chemistry, 2018) Archana Ghosale; Kamlesh Shrivas; Manas Kanti Deb; Vellaichamy Ganesan; Indrapal Karbhal; P.K. Bajpai; Ravi Shankar
Silver nanoparticles modified with poly(vinyl alcohol) (AgNP-PVA) were prepared by the reduction of silver ions with ascorbic acid. The concentrations of AgNPs, type of solvent and solvent ratio were optimized for the preparation of silver nano-ink to obtain a better conductive surface (low resistance). Different substrates such as glass, poly(vinyl chloride) (PVC) and poly(ethylene terephthalate) (PET) were tested and the sintering process was optimized for the preparation of an efficient electrode for electrochemical application. The screen-printed glass electrode fabricated with silver nano-ink showed low resistance and therefore was used as a working electrode in cyclic voltammetry (CV) determination of hydrogen peroxide (H2O2). A wide linear calibration range, 1.0 μM to 0.5 mM, was obtained for the determination of H2O2 with a limit of detection of 0.3 μM. The high recovery percentage (93.3-96.0%) has been obtained for the determination of H2O2 in a complex sample matrix (hospital and beauty parlor wastewater) and an interference study demonstrated the selectivity of the method. The screen-printed glass electrode is found to be simple, low cost and homemade compared to commercially available glass electrodes for monitoring H2O2 in environmental water samples. © 2018 The Royal Society of Chemistry.
Direct-Writing of Paper Based Conductive Track using Silver Nano-ink for Electroanalytical Application
(Elsevier Ltd, 2016) Archana Ghosale; Ravi Shankar; Vellaichamy Ganesan; Kamlesh Shrivas
We present a novel approach for the synthesis of silver nanoparticles capped with oleylamine (AgNPs/OLA) and its application in conductive ink for electroanalytical application. The synthesized OLA capped AgNPs was characterized with TEM, UV-Vis, EDX, FTIR and TGA to confirm the size, composition and surface modification of NPs. In this paper, we report conductive ink printing using a pen to achieve a best conductivity value of 0.11 × 105 Scm−1. A 10 wt% AgNPs nano-ink solution was used for printing conductive electrodes (counter, reference and working) on-to photo paper and sintered at 150 °C for 1 h to achieve metallization. We demonstrated successful application of printed conductive electrodes in cyclic voltammetry (CV) measurement. To ensure the continuity of conductive pattern, we demonstrated the lighting of LED when conductive track was connected to a 9 V battery. This report shows that paper-based flexible electrodes are user-friendly, cost effective and useful for multiple analyses in CV compared to other printed electrodes. © 2016 Elsevier Ltd
Low-Cost Paper Electrode Fabricated by Direct Writing with Silver Nanoparticle-Based Ink for Detection of Hydrogen Peroxide in Wastewater
(American Chemical Society, 2017) Archana Ghosale; Kamlesh Shrivas; Ravi Shankar; Vellaichamy Ganesan
A simple, low cost and user-friendly method for the fabrication of paper electrode (PE) using silver nanoparticles capped with octylamine (AgNPs-OA) is reported for detection of hydrogen peroxide (H2O2) in wastewater samples. The PE was prepared by direct writing onto the photo paper using a ball-point pen filled with nanoink (10 wt % of AgNPs-OA in chloroform). The prepared electrode was sintered at 100 °C for 1 h to make it conductive. The PE/AgNPs-OA was used as a working electrode in cyclic voltammetry (CV) for the detection of H2O2. The PE/AgNPs-OA exhibited a wide linear calibration range from 1.7 μM to 30 mM for the determination of H2O2 with a low limit of detection, 0.5 μM. The good recovery percentage (95.2-96.2%) and interference study for determination of H2O2 in wastewater samples demonstrated the selectivity of the method from the complex sample matrices. The PE/AgNPs-OA electrode is found to be economic, facile and user-friendly for multiple analyses (n = 60) of H2O2 in CV compared to other commercially available electrodes and custom-made modified electrodes. © 2016 American Chemical Society.