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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...
Titanium oxide films were prepared on ITO coated glass substrates at 350 C using titanium (IV) isopropoxide, acetylacetonate and absolute ethanol as precursors by spray pyrolysis technique. The prepared films were characterized by X-ray diffraction, Scanning electron microscope, Fourier transform infrared spectroscopy and Energy dispersive analysis of X-rays. Estimated optical and electrical parameters...
Palladium and palladium alloys (nickel, cobalt and nickel co-substituted) were prepared using low temperature chemical reduction technique at 300 K. The synthesized metal and alloys were deposited using PLD on alumina substrate. The deposited nanostructured thin film alloys showed much better sensitivity towards hydrogen between the concentrations of 2000 and 20000 ppm of hydrogen than pure palladium...
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...
The nAg/PVP and nAg/PVA composites were synthesized by using chemical reduction method. The neat Poly vinyl pyrrolidone (PVP) and polyvinyl alcohol (PVA) at different concentrations and their nano metal polymer composites were studied for electrical humidity sensing, ranging from 5–90% RH. The neat polymers and their composites were coated on ceramic rods having built in electrodes by drop casting...
The paper presents Tin oxide (SnO2) based low cost, high temperature operable resistive type low humidity (10–20%RH) sensor. SnO2 thin films were prepared by spin coating 50 μl of synthesized (SnCl2) solution on alumina substrate (1.44 cm2). Material characterization of the synthesized material was carried out using UV-Visible, SEM and XRD. To get films of higher thickness they were coated from 1...
In this work, the annealing effects of e-beam deposited Ta2O5 films on the pH sensitivities of EIS based sensors are presented. XPS studies confirmed that the films annealed above 700 °C showed the best stoichiometry (Ta1.96O5.04) compared to the as deposited film and the films annealed till 600 °C. XRD spectra confirmed the amorphous nature of the as deposited film, which remained amorphous till...
Cadmium zinc oxide (CdXZn1−XO) thin films were deposited at low substrate temperature using advanced spray pyrolysis technique. Aqueous solution of cadmium acetate and zinc acetate were used as initial ingredients. The films were prepared by keeping optimized preparative parameters constant. Influence of variation of zinc in the ‘CdXZn1−XO’ system on the structural, electrical and gas sensing properties...
This paper presents the design simulations of MEMS based micro-cantilever beam made up of PDMS properties using COMSOL Multiphysics. The cantilever beam structure on fluid Channel has been simulated. The simulations results into the stress, displacement, The study brings out a novel methodology for detection of pathogens at minute level. The in-flow methodology enables the device to be used in online...
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...
In previous research work related to the acoustic sensors, the researchers had focused on the individuality of the sensors for aeroacoustic application and sensors for audio range application. This paper describes a simple and novel model of acoustic sensor for aeroacoustic and audio applications (microphone). The model of the device presented in this paper shows interoperability. The sensor reported...
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