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In the present work, we report the room temperature NH3 sensing properties of Cobalt-boride nanoparticles intercalated polyaniline (Co-B-PANI) nanocomposite films. Polyaniline nanocomposite films (PNCF's) have been deposited at room temperatures by in-situ oxidative polymerization of aniline in the presence of Co-B nanoparticles. The PNCF exhibited a highly selective, sensitive and reversible response...
The present paper reports room temperature operable LPG sensor based on Fe2O3-PdOdoped SnO2 thin films. Thin films were deposited by spin coating and were fired at an optimized temperature of 550°C. Single step thermal decomposition is used to get SnO2 films. The obtained films showed response from 100 to 2520 ppm of LPG. The films were characterized by XRD and UV-Vis spectroscopy. The average particle...
The paper reports the development of low cost, portable and easily operable optical fiber based carbon dioxide biosensor (CO2). The chlorophyll and anthocyanin is used as active clads. Coriander and red leaf amaranth (amaranth) contain photosynthetic pigments viz. chlorophyll and anthocyanin. Developed sensors selectively show CO2 gas concentration dependent response from 1 to 500 ppm that is measured...
Heterojunction nanocomposites were realized between p-type CuO and n-type SnO2 by simple hydrothermal route, further incorporation with 0.5wt.% silver showed an efficient sensor response of 72.02% towards carbon dioxide at a comparably low operating temperature of 300°C. The synthesized samples were characterized extensively by XRD and UV-DRS. Morphological evaluations carried out using transmission...
ZnO Nanostructured thin film of thickness 200nm was deposited on quartz by spray pyrolysis technique; further interdigitated ITO electrodes were fabricated by lithography. Compositional, surface morphology and electrical characterization of ZnO nanostructure thin film was done using X-ray photo electron spectroscopy (XPS), Secondary electron microscopy (SEM), and current-voltage (I-V) measurement...
A system to detect the direction of the odor source using a sensor array has been designed. The system uses the relation between the responses of different sensors to determine the direction of source. A novel dynamic direction detection method based on a neural network is presented for detecting direction of ethanol odor source. Odor-Compass can be used in applications like hazardous gas leakage...
Highly porous zinc ferrite (ZnFe2O4) nano-size powders are synthesized by varying fuel to oxidizer ratio. The metal nitrates are used as oxidizers while glycine is used as a fuel. The synthesis of material is carried out using an auto-combustion method. It is observed that the enhancement of magnetization occur with the enhancement of ‘Fuel to Oxidizer’ ratio i.e. Glycine to metal Nitrate (G/N) ratio...
Nanocrystalline tin oxide powder is synthesized using sol gel method. To observe the effect of addition of surfactant on particle size, Sodium Dodecyl Sulphate (SDS) is added during the synthesis. The particle is found to be ∼ 8 nm using TEM. The synthesized nanophase tin oxide powder is used to fabricate thick film sensors using screen printing technique. The sensor performance is tested for 100...
Herein present study, organic-inorganic hybrids based on WO3/PANI nanocomposites have been synthesized at room temperature, by using oxidative polymerization. The as-synthesized products have been studied by using X-ray diffraction analysis, FE-SEM and optical characterization. The XRD analysis depicts peak broadening and the shift in peak position from standard values, which can be attributed to...
There is a growing interest in developing efficient and economically viable hydrogen (H2) sensors for the swift detection of leakage of H2 in areas where hydrogen is used. In the present study we have prepared palladium catalysed antimony doped tin dioxide by sonochemical process, as a H2 gas sensing material for 1000 ppm to 8% by volume H2 gas concentration. The electrical characteristics of the...
Zinc oxide (ZnO) nanorod arrays were deposited on to the soda-lime glass substrates by wet chemical route using zinc acetate as precursor. The structural and surface morphological properties of the ZnO nanorod arrays (ZNAs) were investigated by X-ray diffraction (XRD), and scanning electron microscopy (SEM) respectively. The XRD pattern revealed wurtzite crystal structures of ZNAs, preferentially...
Mn has substituted part of Fe in cobalt ferrite (CoFe2O4) and resultant material has been abbreviated as CFMO (CoFe1.7Mn0.3O4). Chemical co-precipitation route has been followed for synthesis. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), I-V measurement were performed for sample characterization. The influence of Mn substitution was seen...
An electrochemical amperometric sensor measures the electric current on the surface of the working electrodes and estimates the concentration of chemical or biological species. Electrochemical sensor is fast and selective but electrochemical sensing is a complex phenomenon involving both physical and chemical processes. With a view to understand the basic operation of electrochemical sensor, present...
The Al2O3 modified ZnO nanostructure with 1:9 ratio was synthesized at 500°C using solid-state reaction technique. The prepared nanostructure material was characterized with XRD and FE-SEM technique. XRD indicate the formation of wurtzite phase of ZnO. FE-SEM confirms the formation of hexagonal shaped rod like morphology. The sensing characteristic of the material was tested using ethanol gas.
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