Abstract
A simple and sensitive method for the simultaneous voltammetric detection of two trace phytohormones both indole-3-acetic acid (IAA) and salicylic acid (SA) was successfully realized using composite film modified glassy carbon electrode (GCE) with enhanced sensing performance. Carboxymethyl cellulose (CMC), a water-soluble biopolymer with good film-forming ability and adhesive property was selected as the disperser, stabilizer, and binder for improving the water-dispersibility of single-walled carbon nanotube (SWCNT) with excellent electrocatalytic ability and montmorillonite (MMT) with high effective surface area and surface adsorption capacity, and enhancing the water stability and adhesion between the coating and substrate electrode. CMC-SWCNT-MMT/GCE displayed enhanced electrode stability in water, effective surface area, adhesive property and adsorption capacity, and good electrocatalytic activity for the oxidation of both IAA and SA, which could simultaneously detected two trace phytohormones with high sensitivity, low detection limit, and good sensing stability. Satisfactory results indicated the water-dispersed CMC-SWCNT-MMT with enhanced sensing performance provided a promising platform for the electrochemical application of high-performance composite film-modified electrode.
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