Studie zdůrazněných teplotně závislých elektrických vlastností vyrobených nanokompozitních filmů ZnO/PVA/PANI

Polyvinyl alcohol-Polyaniline composite films with different amounts of zinc oxide (ZnO) (0.2%, 0.4%, 0.6% and 1%)were prepared by in situ polymerization followed by film casting and drying. The samples, ZnO and PPZ films, were characterized by various techniques. The presence of ZnO in PPZ films was confirmed by the X-Ray Diffractometer (XRD). The surface morphology of the ZnO and PPZ films were examined by the Field-Emission Scanning Electron Microscopy(FESEM). The formation of absorption bonds corresponding to the PPZ films were illustrated by the Fourier Transform Infrared Spectroscope (FTIR)analysis. The films were found to be stable up to 150 ◦C, which was confirmed from the Differential Scanning Calorimetry (DSC) and Thermo-Gravimetric Analyzer (TGA) technique. The absorption peaks of PPZ, around visible and UV region, was studied by the UV–Vis spectra. The electrical conductivity plots obtained from the impedance analyzer, between frequency ranges of 10 Hz to 100 kHz, show that the increase in concentration and temperature of the samples resulted in the higher conductivity of the PPZ films. For 1% ZnO concentration at 150 ◦C, the AC conductivity of PPZ1 was found to be 20.06 S/m. Such conductivity behavior samples render the applicability of the PPZ films.Polyvinylalkohol-polyanilinové kompozitní filmy s různým množstvím oxidu zinečnatého (ZnO) (0,2 %, 0,4 %, 0,6 % a 1 %) byly připraveny in situ polymerací následovanou odléváním filmu a sušením. Vzorky, ZnO a PPZ filmy, byly charakterizovány různými technikami. Přítomnost ZnO v PPZ filmech byla potvrzena rentgenovým difraktometrem (XRD). Morfologie povrchu ZnO a PPZ filmů byla zkoumána pomocí Field-Emission Scanning Electron Microscopy (FESEM). Tvorba absorpčních vazeb odpovídajících PPZ filmům byla ilustrována analýzou Fourier Transform Infrared Spectroscope (FTIR). Bylo zjištěno, že filmy jsou stabilní až do 150 ◦C, což bylo potvrzeno technikou diferenciální skenovací kalorimetrie (DSC) a termogravimetrického analyzátoru (TGA). Absorpční píky PPZ kolem viditelné a UV oblasti byly studovány pomocí UV-Vis spekter. Grafy elektrické vodivosti získané z analyzátoru impedance mezi frekvenčními rozsahy 10 Hz až 100 kHz ukazují, že zvýšení koncentrace a teploty vzorků mělo za následek vyšší vodivost PPZ filmů. Pro 1% koncentraci ZnO při 150 ◦C byla zjištěna střídavá vodivost PPZ1 20,06 S/m. Takové vzorky vodivosti poskytují použitelnost PPZ filmů

Fabrication of Ag/PDMS-TiO2 flexible piezoresistive pressure sensor

In this study, TiO2 nanorods are grown on a flexible Polydimethylsiloxane (PDMS) substrate using the hydrothermal technique. The morphological, structural, compositional, optical properties and pressure sensing are investigated in detail by FESEM, XRD, EDX, UV-visible spectrophotometer, and piezoelectric studies. XRD demonstrates the pure rutile phase with a tetragonal structure is formed from deposited TiO2 thin film. FESEM images confirm the TiO2 nanorods with average dimensions length similar to 620 nm and diameter similar to 97 nm whereas the optical spectrum shows the strong light absorption in the UV region with bandgap 3.54 eV. The voltage is measured as a response to the applied mechanical load and the sensitivity of the pressure sensor is obtained as 2.56 x 10(-5) V/N. The flexible pressure sensors (Ag/PDMS-TiO2) senses over a large pressure range and shows a linear response because of the adjustments in the volume of dielectric that makes the pressure inside the dielectric cavity to vary

An Ontological approach towards retrieval of video semantically

Recent era there is an increase in the use of videobased applications which revealed the need for extracting the content in videos and how semantically they are interrelated. In this paper we propose a semantic content extraction system that allows users to query and retrieve objects, events, and concepts that are extracted automatically by building the ontology with respect to events and related interest. This paper discusses retrieval techniques of multimedia content using ontology semantically