Nanostructured Electrodes for Analytical Electrochemistry Applicat.

Abstract

Nanostructured materials have created substantial research interest in the last few decades, as they have various advantages such as a high surface area. Brij 58 has not been employed previously to produce mesoporous platinum electrode. This project established that Brij 58 has a stable hexagonal phase with HCPA over a wide range of temperatures (25-65°C), which suggests that it is suitable for preparing mesoporous electrode. Several types of Mesoporous platinum electrodes with a different morphology have been produced using three types of surfactants; specifically, Brij 56, Brij 58 and phytantriol. Synthesis of mesoporous platinum electrode was by way of the electrochemical plating of lyotropic liquid crystalline. Mesoporous H158-ePt electrodes delivered variable results regarding the roughness factor (Rf) and surface area. Mesoporous QII-ePt electrode delivered a high surface area of 37 m2 g-1 and Rf of 384. The Rf of the H156-ePt electrode was 211. The structure of mesoporous platinum electrodes was studied using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX). The all different mesoporous electrodes morphology was used to compare their behaviour in the detection of a wide range of glucose concentrations (1mM-12mM). Cyclic voltammetry and chronoamperometry were used for glucose detection. Two linear ranges were displayed for the mesoporous platinum electrodes and the sensitivity for H156,58-ePt electrodes was 5.1 μA mM-1cm-2. Good sensitivity, as high as 102 μA mM-1cm-2 was observed for QII-ePt electrode.