Abstract
Metal oxides containing iron and zinc (ZnO-Fe2O3) combined with ruthenium bipyridine [Ru(bpy)32+], graphene oxide (GO) and multi-walled carbon nanotube (MWNTs) were applied in the field of electrochemiluminescence (ECL). And a new solid-state ECL sensor for malathion determination by modifying ZnO-Fe2O3, Ru(bpy)32+, GO@MWNTs, Acetylcholinesterase (AchE) and Nafion on the electrode surface. The synthesized ZnO-Fe2O3 and GO@MWNTs with large specific surface area were used as carrier to anchor Ru(bpy)32+ and AchE, respectively. ZnO-Fe2O3 and GO@MWNTs can also be used as accelerators to promote electron transfer of the system. ZnO-Fe2O3 was also involved in the luminescence reaction, which increased the sensitivity of the system together with Ru(bpy)32+. Taking advantages of the electrocatalysis and electron transport capacity of ZnO-Fe2O3 and GO@MWNTs, the sensor obtained stable and amazing ECL response. The ECL response value decreased after malathion was introduced. In the range of 6.6 × 10−11 to 6.6 × 10−7 M, the decrease value (ΔI) was linearly related to the logarithm of malathion concentration, and the detection limit was 2.2 × 10−11 M. The method was simple and stable, and can be used to determine malathion in vegetable samples.
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