title: Nanostructured SnO2 encapsulated guar-gum hybrid nanocomposites for electrocatalytic determination of hydrazine.
abstract: The present article deals with synthesis of sol-gel derived tin dioxide (SnO2) nanoparticles encapsulated in to guar gum (GG) biopolymer as the organic-inorganic hybrid materials for the determination of hydrazine. The organic-inorganic hybrid combines the perfunctory strength offered by the inorganic SnO2 nanoparticles with flexible binding sites provided by the organic biopolymer (GG) solution by the ultrasonication. The phase identification, crystalline size, surface morphology and optical properties of prepared SnO2 and SnO2-GG nanocomposites has been investigated through FT-IR, XRD, SEM, AFM, TEM, UV-Vis, and PL techniques. The colloidal solution of SnO2 and GG is electrophoretically deposited (EPD) onto the indium tin-oxide (ITO) glass substrate and studied for the electrooxidation of hydrazine. Under the optimized experimental conditions, the linearity between the current response and the hydrazine concentration has been obtained in the range of 2-22 mM, with a low detection limit of 2.76 mM and a high sensitivity of 5.72 μA cm(-2). Based on the linear increase in amperometric current, a sensitive hydrazine electrochemical sensor is constructed. The proposed SnO2-GG/ITO electrode shows a good response time (35s), reproducibility, and long-term stability. The obtained results suggest that SnO2-GG nanocomposites electrode provides a favorable sensing platform for the electrochemical studies. In addition, the cyclic voltammetry (CV) studies are used to evaluate the kinetic parameters.
authors.affiliation: Department of Applied Chemistry & Polymer Technology, Delhi Technological University, Shahbad Daulatpur, Main Bawana Road, Delhi 110042, India.
authors.forename: Priya
authors.initials: P
authors.lastname: Malik
authors.affiliation: Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India.
authors.forename: Manish
authors.initials: M
authors.lastname: Srivastava
authors.affiliation: Solar Energy Material Laboratory, Department of Energy, Tezpur University, Tezpur, Assam 784 028, India.
authors.forename: Ranjana
authors.initials: R
authors.lastname: Verma
authors.affiliation: Department of Applied Chemistry & Polymer Technology, Delhi Technological University, Shahbad Daulatpur, Main Bawana Road, Delhi 110042, India.
authors.forename: Manish
authors.initials: M
authors.lastname: Kumar
authors.affiliation: Department of Applied Chemistry & Polymer Technology, Delhi Technological University, Shahbad Daulatpur, Main Bawana Road, Delhi 110042, India. Electronic address: dkumar@dce.ac.in.
authors.forename: D
authors.initials: D
authors.lastname: Kumar
authors.affiliation: Department of Applied Chemistry & Polymer Technology, Delhi Technological University, Shahbad Daulatpur, Main Bawana Road, Delhi 110042, India. Electronic address: jay_singh143@yahoo.co.in.
authors.forename: Jay
authors.initials: J
authors.lastname: Singh
mesh_terms: D002384:Catalysis; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D005685:Galactans / Q000737:chemistry*; D006834:Hydrazines / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D049449:Luminescence; D008351:Mannans / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D053149:Plant Gums / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D017971:Tin Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D005685:Galactans; D006834:Hydrazines; D008351:Mannans; D053149:Plant Gums; D017971:Tin Compounds; C029424:hydrazine; C109984:indium tin oxide; C007894:guar gum; C045358:stannic oxide
keywords: Electrochemical studies; Guar-gum; Hydrazine; Nanoparticles; SnO(2)