Date of Award

1-1-2001

Thesis Type

Masters

Document Type

Thesis

Divisions

Faculty of Science

Department

Department of Physics

Institution

Universiti Malaya

Abstract

Copper(II) cinnamate (CC) was prepared from copper(II) acetate monohydrate and cinnamic acid. It was a light-blue powder. The Fourier Transform Infrared (FTIR) spectrum of CC, recorded as potasium bromide (K.Br) disc, indicated the presence of all bonds and functional groups expected of it and showed that it exist as an equal mixture of cis- and trans- isomers. The conductivity of CC at room temperature was 5.22 x 10⁻¹¹Scm⁻¹. It showed metallic behaviour in the temperature range 78-300 K, and its conduction mechanism obeyed Mott's variable range hopping (VRH) model in the same temperature range. The density of states at Fermi level calculated based on VRH model is 6.35 x 1023 eV⁻¹cm⁻³. The hopping distance, hopping energy, and density of charge carriers at 298 K are 3.38A, 0.0097 eY, and 1.63 x 10²⁸ cm·' respectively. CC was doped with iodine up to 20.0%. FTI.R spectra for all doped samples, recorded as K.Br discs, showed that iodine has no detectable effect on the structure of CC. The sample doped with 16.0% iodine showed the highest conductivity value of 4.82 x 10⁻⁹ Scm⁻¹ at room temperature. It showed metallic behaviour in the temperature range 78-300 K, and its conduction mechanism obeyed VRH model in the same temperature range. The density of states at Fermi level calculated based on VRH model is 1.2 x 10²⁴ ev⁻¹ cm⁻³. The hopping distance, hopping energy, and density of charge carriers at 298 K are 3.02 A, 0.0087 eY, and 2.5 x 10²⁸ cm⁻³ respectively. CC and CC doped with 16.0% iodine were also annealed at 50-200°C in nitrogen ambient. FTIR spectra showed that annealing at these temperature ranges has no effect on the structure of the samples. It was found that CC and CC doped with 16.0% iodine annealed at 150°C have highest conductivity at 1.18 x 10⁻⁹ Scm-1 and 6.03 x 10⁻⁹ Scm⁻¹ respectively.

Initial

snms

Additional Information

Dissertation (M.A) -- Faculty of Science, Universiti Malaya, 2000.

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