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Keywords:

  • Copper;
  • Amino-containing organosilica;
  • Ultrafine nanoparticle-modified-electrode;
  • Stripping voltammetry

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.