Date of Award

1-1-2000

Thesis Type

Masters

Document Type

Thesis

Divisions

Faculty of Science

Department

Department of Physics

Institution

Universiti Malaya

Abstract

Copper(II) 4-aminobenzoate (CAB), prepared from copper(II) acetate monohydrate and 4-aminobenzoic acid, was a dark green powder. Fourier Transfonn lnfrared (FTIR) spectrum of CAB, recorded as KBr disc, indicated the presence of all bonds and functional groups expected of it, and the absence of hydrogen bonding. Its conductivity at room temperature was 4.2 x 10^-11 Scm^·1. The value increased as temperature decreased indicating metallic behaviour. Density of states at Fenni level, hopping distance, hopping energy and density of charge carriers calculated based on Mon's Variable Range Hopping model (VRH) are 2.65x 10^-22 (eV)^-1 cm^-3, 7.47 x 10^-8 cm, 0.02 eV and 6.87x I0^20 cm^-3 respectively. CAB was then doped with iodine up to 28%. FTIR for all doped samples, recorded as KBr disc, indicated that iodine did not have visible effect on its structure. CAB doped with 20% iodine had maximum conductivity at room temperature of 5.4 x 20^-10 Scm^-1 . Its density of states at Fermi level, hopping distance, hopping energy and density of charge carriers calculated based on VRH model are 2.31 x 10^23 (eV)^-1cm^-3, 4.35 x 10^-8 cm , 0.013 eV and 5.97 x 10^21 cm^-3 respectively. CAB and CAB doped with 20% 12 were also annealed at 50°C-200°C in nitrogen ambient FT1R spectra indicated that CAB underwent cross-linking at I 00°C, and the maximum conductivity was 4.56x 10^-10 Scm·1 at l50°C. ln contrast, CAB doped with 20% iodine did not undergo cross-linking and the conductivity showed a minimum value of 1.13 x 10^-10 Scm^-1 at 100°C.

Initial

snms

Additional Information

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

Download

Share

COinS