SCHEDULED MAINTENANCE
Preparation of three-dimensional ordered macroporous C60 and its application in electrochemical sensors
Abstract
Three-dimensional ordered macroporous (3DOM) materials based on fullerenes (C60) were prepared by using silica (SiO2) colloidal crystals as templates. The silica colloids were deposited in an orderly manner onto the gold surface, followed with the infiltration of the C60 nanoparticles into the interspaces of the colloids. The as-formed SiO2/C60 hybrid colloidal crystals were subsequently immersed in hydrofluoric acid to remove the silica components fully to obtain 3DOM C60 frameworks. The control of the C60 infiltration solution concentration is the key to obtaining a high quality 3DOM structure of C60. The band gaps of the SiO2 colloidal crystal, SiO2/C60 hybrid colloidal crystal and 3DOM C60 were measured by UV-Vis reflection spectrometry, calculated using Bragg's law, and simulated by Band SOLVE, respectively. It was demonstrated that the 3DOM C60 possesses electrochemical activity and can be used in detecting dopamine with a detection limit of 1.3 × 10−9 mol L−1. Having a three-dimensional ordered macroporous structure with a greater surface area, the 3DOM C60 modified electrode performed better than an unordered C60 modified electrode and a bare gold electrode.
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