Shivaji University

About: Shivaji University is a education organization based out in Kolhāpur, Maharashtra, India. It is known for research contribution in the topics: Thin film & Scanning electron microscope. The organization has 3078 authors who have published 5295 publications receiving 115397 citations.

H2S gas sensing properties of nanocrystalline Cu-doped ZnO thin films prepared by advanced spray pyrolysis

Abstract: The ZnO-based thin films doped with 1–4 wt% Cu were deposited on the glass substrates using the advanced spray pyrolysis technique. All films are deposited at 473 K. The crystallinity and morphology of the films were characterized by XRD, TEM and FE-SEM respectively. The structural analyses of the films indicate that they are polycrystalline and have a hexagonal wurtzite structure; however Cu doping enhances the preferential orientation along the [0 0 2]. The energy dispersive X-ray spectroscopic analysis (EDX) confirmed an enhancement in the amount of Cu in the film with increase in the copper concentration in the starting solution. The sensor response was estimated by the change in the electrical conductance of the film in the absence and presence of H2S gas. The sensor response and selectivity in relation to, operation temperature, Cu doping concentration and the gas concentration has been systematically studied. A significant response (∼0.38) towards 20 ppm H2S at 523 K operating temperature is observed for the 4 wt% Cu-doped ZnO. The Pd-sensitized 4 wt% Cu doped ZnO film exhibits improved sensing characteristics with good stability.

Low cost flexible 3-D aligned and cross-linked efficient ZnFe2O4 nano-flakes electrode on stainless steel mesh for asymmetric supercapacitors

Abstract: A simple and economic approach for growth of 3-D aligned and cross-linked ZnFe2O4 nano-flakes on a flexible stainless steel mesh (FSSM) substrate (300 mesh) using a rotational chemical bath deposition technique for fabricating efficient asymmetric supercapacitors is reported. The prepared ZnFe2O4 nano-flake thin film (ZnFe2O4/FSSM-300) as an anode in combination with Ni(OH)2/FSSM-300 as a cathode was used as an asymmetric supercapacitor. Furthermore, ZnFe2O4 nano-flakes were also grown on FSSM with a different mesh and designated as ZnFe2O4/FSSM-200, ZnFe2O4/FSSM-250 and ZnFe2O4/FSSM-300 for investigating the effect of mesh size on the morphology formation and their electrochemical performance. Amongst the samples, ZnFe2O4/FSSM-300 exhibited excellent supercapacitive properties, such as a higher specific capacitance (1625 F g−1 at 1 mA cm−2) and excellent cycle stability (8000 cycles, 97% retention), which was marginally higher than ZnFe2O4/FSSM-250 (545 F g−1 at 1 mA cm−2, 70% retention), ZnFe2O4/FSSM-200 (241 F g−1 at 1 mA cm−2, 56% retention) and other earlier reported ferrites. In addition, the fabricated asymmetric pseudocapacitor device delivered better performance with high specific capacitance (118 F g−1 at 5 mA cm−2), excellent cycle stability (8000 cycles, 83% capacitance retention) and high energy density (42 W h kg−1) even at higher power density (5 kW kg−1).

Extraction and characterization of acid soluble collagen from fish waste: Development of collagen-chitosan blend as food packaging film

Abstract: Skin of Centrolophus niger (black ruff) commonly referred as Medusa, is used for the extraction of Acid Soluble Collagen. This is the first report of collagen extraction from skin of black ruff where lactic acid with 45% yield proved to be efficient solvent. SDS-PAGE, UV visible absorbance, FT-IR and SEM analysis confirmed that extracted collagen is native type I. Extracted collagen showed emulsifying activity index as 20.24 m2 g−1 and emulsion stability index of 15.86 min. Collagen was used for the preparation of collagen-chitosan film which could be used for food packaging purpose. Film incorporated with 5% pomegranate peel extract declined solubility in water remarkably and showed antibacterial effect against food borne pathogens like Bacillus saprophyticus LNB 333F5, Bacillus subtilis NCIM 2635, Salmonella typhi NCIM 2501 and Escherichia coli NCIM 2832. Thus, present study deals with extraction and characterization of collagen from fish waste and its application in the development of antibacterial active food packaging film.