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Electrochemical and spectroscopic properties of fly ash-polyaniline matrix nanorod composites

被引：25
作者：
Iwuoha, Emmanuel I.
Mavundla, Sipho E.
Somerset, Vernon S.
Petrik, Leslie F.
Klink, Michael J.
Sekota, Mantoa
Bakers, Priscilla
机构：
[1] Univ Western Cape, Dept Chem, Sensor Res Lab, ZA-7535 Bellville, South Africa
[2] Univ Western Cape, S African Inst Adv Mat Chem, ZA-7535 Bellville, South Africa
来源：
MICROCHIMICA ACTA | 2006年 / 155卷 / 3-4期
关键词：
cyclic voltammetry; fly ash; polyaniline nanorods; polyaniline nanotubes; poly(styrene sulphonic acid); polyaniline-fly ash composites; scanning electron microscopy;
D O I：
10.1007/s00604-006-0584-z
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Polyaniline (PANI) nanocomposites were prepared with fly ash (FA) either by aging the starting materials (aniline and FA) before oxidative polymerisation or by including poly(styrene sulphonic acid) (PSSA) eliminating the aging step. The aging procedure formed polymer nanotubes that have cross-sectional diameters of 50-110 nm. The procedure involving PSSA produced nanorods and nanofibres composites that have diameters of 100-500 nm and length of up to 10 mu m attributed to the presence of metal oxides and silica in FA. The electrochemical analysis of the PANI-PSSA-FA nanorod composites shows three redox couples with formal potentials, E-0'((200mV s-1)), values of 105mV, 455mV and 670mV, and conductance, C, value of 1.21 x 10(-2) S. The UV-Vis spectroscopy of the polymeric nanorod shows absorption maxima at 340 and 370 nm (due to pi-pi* transition of the benzoid rings), and 600-650 nm (due to charge transfer excitons of the quinoid structure), which are characteristic of emeraldine base.
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页码：453 / 458
页数：6
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