Amino‐Containing Ultrafine Organosilica‐Nanoparticle‐Modified Au Electrode for the Determination of Cu(II) Ions |
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Authors: | Zhongwei Wu Jinjin Liao Jianlin Xiao Jianyun Liu Jianmao Yang Xin Zhou Meng Xin |
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Affiliation: | 1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, P.?R. China;2. Research Center for Analysis & Measurement, Donghua University, Shanghai 201620, P.?R. China |
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Abstract: | Using 3‐Aminopropyltriethoxysilane(APTES) as a single silica source, an amino‐rich ultrafine organosilica‐nanoparticle‐modified Au electrode was fabricated, following the formation of (3‐mercaptopropyl)‐trimethoxysilane (MPTS) monolayer on Au surface (MPTS/Au). With cetyltrimethylammonium bromide as an additive, APTES‐based gel particles on the electrode have a narrow particle size distribution of 4–7 nm and “crystal‐like” structure. AFM and electrochemical characterization confirmed the successful grafting of APTES nanoparticles on MPTS/Au. The APTES/MPTS/Au electrode is highly sensitive for the detection of copper(II) ions with a detection limit as low as 1.6×10?12 mol L?1 (S/N>3) by square wave voltammetry. The current is linear to copper(II) concentration between 1.6×10?12 and 6.25×10?10 mol L?1. |
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Keywords: | Copper Amino‐containing organosilica Ultrafine nanoparticle‐modified‐electrode Stripping voltammetry |
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