KARAN SINGH - Academia.edu (original) (raw)
Dr Karan Pratap Singh has complted his PhD from BHU in chemistry in 2011, hold president MITWS since 2012. Research domain materials, biosensor, composite material polysaccharides, conducting polymer, ormosil
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Papers by KARAN SINGH
In this paper, we present a comparative study of polyaniline/polysaccharide composites (starch, c... more In this paper, we present a comparative study of polyaniline/polysaccharide composites (starch, carboxymethyl cellulose, cellulose acetate, and chitosan) by FTIR, UV-visible, SEM and electrochemical analysis. We propose that simultaneously three different phenomena happen while formation of composite system that may be listed as degradation of polysaccharide, polymerization of aniline, formation of polyaniline-polysaccharide composite. Effects of hydrochloric acid and oxidizing agent (ammonium peroxydisulphate) on the structure of polysaccharides were also investigated. We obtained dissimilar product yield and variable polyaniline and polysaccharide ratio in the composite system even though experimental conditions were same. The possible reasons responsible for the observed differences as well as characteristics and morphology of protonated and deprotonated composite materials are discussed.
—Carbon nanotubes (CNT) polymer composites have shown potential applications for sensor/ biosenso... more —Carbon nanotubes (CNT) polymer composites have shown potential applications for sensor/ biosensor fabrication. Methods for preparation, characteristics are highlighted and future aspects are explored. Various analytes and polymeric materials have been cited to prove the importance of polymer/CNT composite systems in sensor technology.
A multi-walled carbon nanotube composite electrode incorporating Polyaniline (PANI) and Polyacryl... more A multi-walled carbon nanotube composite electrode incorporating Polyaniline (PANI) and Polyacrylic acid (PAA) is presented by diffusing aniline and PAA into Nafion-MWCNTs membranes supported upon a platinum macrodisc electrode. Nafion is found to be an ideal medium for dispersion of MWCNTs and for the formation of a homogeneous composite. The composite has been characterized utilizing SEM, TEM, FT-IR and electrochemical techniques. Electrochemical characterization reveals that the redox activity of the composite is improved with the cumulative effect of MWCNTs and PAA as additives. The electroanalytical behavior of the composite is evaluated towards the sensing of ascorbic acid in the presence of dopamine and uric acid exhibiting a detection limit of 2.5 Â 10 À7 M.
Sol-gel process has gained tremendous attention in past decades for the preparation of pure and c... more Sol-gel process has gained tremendous attention in past decades for the preparation of pure and composite material for numerous applications. Organically modified sol-gel glasses (ormosils) have hybrid properties of rigid inorganic silica matrix and organic functionalities. Ormosils provide ambient environment for bio-molecules encapsulation and such systems have been used widely for biosensor applications. Biological elements including enzymes, antibodies, antigens, DNA, whole cells, tissues, proteins, biologically derived material, and biomimetic materials provide the possibility of biological recognition to the device and transducer to detect the biological signals with the help of associated electronics and software to amplify these signals into a readable form for the user. In this review we report on the formation of sol-gel based composite materials primarily on ormosil along with carbon nano tubes, metal nano particles, mediators, inorganic complexes, polymers, ionomers and biological materials and cite the electrochemical sensor/biosensor system based on it.
In this paper, we present a comparative study of polyaniline/polysaccharide composites (starch, c... more In this paper, we present a comparative study of polyaniline/polysaccharide composites (starch, carboxymethyl cellulose, cellulose acetate, and chitosan) by FTIR, UV-visible, SEM and electrochemical analysis. We propose that simultaneously three different phenomena happen while formation of composite system that may be listed as degradation of polysaccharide, polymerization of aniline, formation of polyaniline-polysaccharide composite. Effects of hydrochloric acid and oxidizing agent (ammonium peroxydisulphate) on the structure of polysaccharides were also investigated. We obtained dissimilar product yield and variable polyaniline and polysaccharide ratio in the composite system even though experimental conditions were same. The possible reasons responsible for the observed differences as well as characteristics and morphology of protonated and deprotonated composite materials are discussed.
—Carbon nanotubes (CNT) polymer composites have shown potential applications for sensor/ biosenso... more —Carbon nanotubes (CNT) polymer composites have shown potential applications for sensor/ biosensor fabrication. Methods for preparation, characteristics are highlighted and future aspects are explored. Various analytes and polymeric materials have been cited to prove the importance of polymer/CNT composite systems in sensor technology.
A multi-walled carbon nanotube composite electrode incorporating Polyaniline (PANI) and Polyacryl... more A multi-walled carbon nanotube composite electrode incorporating Polyaniline (PANI) and Polyacrylic acid (PAA) is presented by diffusing aniline and PAA into Nafion-MWCNTs membranes supported upon a platinum macrodisc electrode. Nafion is found to be an ideal medium for dispersion of MWCNTs and for the formation of a homogeneous composite. The composite has been characterized utilizing SEM, TEM, FT-IR and electrochemical techniques. Electrochemical characterization reveals that the redox activity of the composite is improved with the cumulative effect of MWCNTs and PAA as additives. The electroanalytical behavior of the composite is evaluated towards the sensing of ascorbic acid in the presence of dopamine and uric acid exhibiting a detection limit of 2.5 Â 10 À7 M.
Sol-gel process has gained tremendous attention in past decades for the preparation of pure and c... more Sol-gel process has gained tremendous attention in past decades for the preparation of pure and composite material for numerous applications. Organically modified sol-gel glasses (ormosils) have hybrid properties of rigid inorganic silica matrix and organic functionalities. Ormosils provide ambient environment for bio-molecules encapsulation and such systems have been used widely for biosensor applications. Biological elements including enzymes, antibodies, antigens, DNA, whole cells, tissues, proteins, biologically derived material, and biomimetic materials provide the possibility of biological recognition to the device and transducer to detect the biological signals with the help of associated electronics and software to amplify these signals into a readable form for the user. In this review we report on the formation of sol-gel based composite materials primarily on ormosil along with carbon nano tubes, metal nano particles, mediators, inorganic complexes, polymers, ionomers and biological materials and cite the electrochemical sensor/biosensor system based on it.