STUDY OF OPTICAL BEHAVIOUR OF POLYPYRROLE DOPED POLYVINYLCHLORIDE FILMS
Published In: INTERNATIONAL CONFERENCE ON ADVANCES IN ENGINEERING AND TECHNOLOGY
Author(s): DEEPTI TRIPATHI , VAISHALI BHAVSAR
Abstract: The aim of the present work is concerned with the study of the optical behavior of Polypyrrole doped Polyvinylchloride films at different concentrations of Polypyrrole. .The samples are casted as films. The films were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM). The optical properties of these films are evaluated using UV-VIS spectrophotometer. The XRD spectra showed the amorphous nature of the films. SEM studies revealed a uniform granular structure of PPy. From UV- VIS spectra optical band gap of the films has been calculated using the Tauc’s relation and variations in the values of optical band gap with the variation of percentage concentration of PPy in PVC and have been found to vary from 2.3 to 4.1 ev. The band tail width of localized states has been calculated using Urbach’s relation
- Publication Date: 25-May-2014
- DOI: 10.15224/978-1-63248-028-6-05-108
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VERTICALLY ALIGNED CARBON NANOTUBES BASED MICRO-SENSOR FOR ALCOHOL DETECTION
Published In: INTERNATIONAL CONFERENCE ON ADVANCES IN ENGINEERING AND TECHNOLOGY
Author(s): GEETIKA MATHUR , O P SINHA , U DHAWAN
Abstract: We have demonstrated vertically aligned, multi-walled carbon nanotube (MWCNTs) based alcohol sensor with good selectivity and sensitivity up to 50 ppth (ppth=parts per thousand). Vertically aligned CNTs were synthesized onto silicon substrates using chemical vapor deposition (CVD) system. The sensor was exposed to different alcohols and the impedance was measured using HIOKI LCR Hi tester – 3522-50 system. The results indicates that the sensor is capable of sensing different types of alcohols in various concentration ranges. It exhibits fast, reversible, selective response for different alcohol samples. We have tested the response of the sensor with alcohol concentrations from 50ppth to 100ppth. The impedance of bare sensor was 2.9896 MΏ which was changed to 12.7 MΏ for isopropanol, 33.8 MΏ for butanol, and 48.2 MΏ for ethanol. The sensor can easily reset to its original value by applying small amount of heat using micro-heater fabricated on a PCB board for this application. Based on o
- Publication Date: 25-May-2014
- DOI: 10.15224/978-1-63248-028-6-05-109
- Views: 0
- Downloads: 0