Essay On Vacuum Evaporation
International Journal of Research in Applied, Natural and Social Sciences (IJRANSS)
Vol. 1, Issue 1, June 2013, 9-12
© Impact Journals
ELECTRICAL MEASUREMENTS OF POLYANILINE AND CdS HETEROJUNCTION
NEMPAL SINGH1, JITENDRA SINGH2, SACHIN KUMAR1, MANOJ KUMAR1, ANSUL GAUR3
& KAPIL SIROHI4
1Department of Applied Science, Indraprastha Institute of Technology, Amroha, Uttar Pradesh, India
2Department of Physics, K.G.K. College, Moradabad, Uttar Pradesh, India 3Department of Physics, Forte Institution of Technology, Meerut, Uttar Pradesh, India 4Department of Basic Education, Uttar Pradesh, India
ABSTRACT
In the present paper the thin film of CdS and Polyaniline has been developed by vacuum evaporation technique. The prepared thin films then
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CdS powder (99.99% purity) was evaporated at about 200°C from a deep narrow mounted molybdenum boat. The glass substrate was cleaned in aquaregia washed in distilled water and isopropyl alcohol (IPA). The substrate was kept in a closed box with accuracy to avoid the dust particle on surface.
Thin film of Polyaniline have been prepared by vacuum evaporation technique, Polyaniline is usually prepared by redox polymerization of aniline using ammonium perdisulphate, (NH4)2 S2O2 as an oxidant. Distilled aniline (0.02 M) is dissolved in 300 ml of pre-cooled HC1 (l.0M) solution, maintained at 0-50°C.
A calculated amount of ammonium perdisulphate, (0.05M) dissolved in 200 ml of HCl (1M), pre-coated to 0-50° C, is added to the above solution. The dark green precipitate (ppt) resulting from this reaction is washed with HC1 (l.OM) uptil the green colour disappears.
This ppt is further extracted with terta-hydrofuran and NMP (N-Methyl Pyrolidinone) solution by soxhelf extraction and dried to yield the emeraldine salt. Emeraldine base can be obtained by heating the emeraldine salt with ammonia solution. Simultaneously, separate salt solution is prepared by dissolving the MX (M=Metal and X=Halide) in distilled
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Thermal and environmental stability of the synthesized sample of PANI is investigated by measuring the thermal transport properties of the samples at different temperatures and time using Transient Plane source (TPS) technique. The results indicate that the PANI shows excellent thermal and environmental stability. Chemically prepared Cadmium Sulphide has been printed on a pallet of conducting Polyaniline (of 1.2 cm diameter and 2 mm thickness). This pallet of CdS coated conducting Polyaniline has been sintered at 150° for six hours for ensuring better adhesion. The I-V characteristics of CdS, conducting Polyaniline and CdS coated conducting Polyaniline have been recorded at room temperature using
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