Pub Date : 2000-03-01DOI: 10.1109/SMELEC.2000.932455
S. Gani, N. Abdullah, Dee Chang Fu
Copper(II) 4-fluorobenzoate (CFB), prepared from copper(II) acetate monohydrate and 4-fluorobenzoic acid, is a blue powder. The Fourier transform infrared spectrum of CFB, recorded as potassium bromide disc, indicates the presence of all bonds and functional groups expected of it. The X-ray diffraction pattern indicates that CFB is polycrystalline. The highest diffraction peak occurs at interplanar distance of 15.2 /spl Aring/, which corresponds to particle size of 450 /spl Aring/. Scanning electron microscopy of CFB shows that it has a layered structure. CFB conductivity at room temperature is 1.79/spl times/10/sup -11/ Scm/sup -1/. The value decreases as temperature increases in the temperature range 30-350 K, indicating metallic behaviour. The conduction mechanism obeys Mott's variable range hopping (VRH) model in the temperature range 140-350 K. The density of states at Fermi level based on the VRH model is 2.9/spl times/10/sup 26/ eV/sup -1/ cm/sup -3/. The hopping distance, hopping energy and density of charge carriers at 300 K are 0.73 /spl Aring/, 0.002 eV and 7.53/spl times/10/sup 24/ cm/sup -3/, respectively.
{"title":"Morphology and electrical conductivity of copper(II) 4-fluorobenzoate","authors":"S. Gani, N. Abdullah, Dee Chang Fu","doi":"10.1109/SMELEC.2000.932455","DOIUrl":"https://doi.org/10.1109/SMELEC.2000.932455","url":null,"abstract":"Copper(II) 4-fluorobenzoate (CFB), prepared from copper(II) acetate monohydrate and 4-fluorobenzoic acid, is a blue powder. The Fourier transform infrared spectrum of CFB, recorded as potassium bromide disc, indicates the presence of all bonds and functional groups expected of it. The X-ray diffraction pattern indicates that CFB is polycrystalline. The highest diffraction peak occurs at interplanar distance of 15.2 /spl Aring/, which corresponds to particle size of 450 /spl Aring/. Scanning electron microscopy of CFB shows that it has a layered structure. CFB conductivity at room temperature is 1.79/spl times/10/sup -11/ Scm/sup -1/. The value decreases as temperature increases in the temperature range 30-350 K, indicating metallic behaviour. The conduction mechanism obeys Mott's variable range hopping (VRH) model in the temperature range 140-350 K. The density of states at Fermi level based on the VRH model is 2.9/spl times/10/sup 26/ eV/sup -1/ cm/sup -3/. The hopping distance, hopping energy and density of charge carriers at 300 K are 0.73 /spl Aring/, 0.002 eV and 7.53/spl times/10/sup 24/ cm/sup -3/, respectively.","PeriodicalId":359114,"journal":{"name":"ICSE 2000. 2000 IEEE International Conference on Semiconductor Electronics. Proceedings (Cat. No.00EX425)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130952443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/SMELEC.2000.932301
W. Majid, T. Richardson
The dielectric behaviour of the Langmuir-Blodgett (LB) superlattice containing linear copolysiloxane is investigated by examining the dielectric loss and capacitance of the superlattice at room temperature (21/spl deg/C) in the frequency range of 10/sup 2/ to 10/sup 3/ Hz. The maximum loss value occurs at a frequency of /spl sim/5000 Hz, which corresponds to a relaxation time of 3.18/spl times/10/sup -5/ s. The static permittivity /spl epsiv//sub s/ and the induced permittivity /spl epsiv//sub /spl infin// of the superlattice estimated by extrapolating the Cole-Cole plot of the dispersion curve of the superlattice to frequencies /spl omega/=0 and /spl omega/=/spl infin/ are 3.80 and 3.57 respectively. The Cole-Cole plot obtained experimentally is found to be broad and fall inside the semicircle of the Cole-Cole plot derived for the Debye relaxation theory, but relatively fits with the semi-empirical Cole-Cole relaxation model with /spl alpha//spl sim/0.68.
{"title":"Dielectric properties of a superlattice containing a linear copolysiloxane substituted with aromatic acid side chains Langmuir-Blodgett films","authors":"W. Majid, T. Richardson","doi":"10.1109/SMELEC.2000.932301","DOIUrl":"https://doi.org/10.1109/SMELEC.2000.932301","url":null,"abstract":"The dielectric behaviour of the Langmuir-Blodgett (LB) superlattice containing linear copolysiloxane is investigated by examining the dielectric loss and capacitance of the superlattice at room temperature (21/spl deg/C) in the frequency range of 10/sup 2/ to 10/sup 3/ Hz. The maximum loss value occurs at a frequency of /spl sim/5000 Hz, which corresponds to a relaxation time of 3.18/spl times/10/sup -5/ s. The static permittivity /spl epsiv//sub s/ and the induced permittivity /spl epsiv//sub /spl infin// of the superlattice estimated by extrapolating the Cole-Cole plot of the dispersion curve of the superlattice to frequencies /spl omega/=0 and /spl omega/=/spl infin/ are 3.80 and 3.57 respectively. The Cole-Cole plot obtained experimentally is found to be broad and fall inside the semicircle of the Cole-Cole plot derived for the Debye relaxation theory, but relatively fits with the semi-empirical Cole-Cole relaxation model with /spl alpha//spl sim/0.68.","PeriodicalId":359114,"journal":{"name":"ICSE 2000. 2000 IEEE International Conference on Semiconductor Electronics. Proceedings (Cat. No.00EX425)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130708161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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