A non-enzymatic glucose sensor based on CuO-nanostructure modified carbon ceramic electrode

Abstract

Mesoporous silica-graphite composite (SiO2/C-graphite) was synthesized by the sol-gel technique. The surface area (SBET=98.93m2/g), pore volume (0.30cm3/g) and pore size (12.16nm) were characterized by BET. The novelty of this work lays in the fabrication of material in which ceramic material (SiO2/C-graphite) was decorated with copper oxide (CuO) nanostructure. SEM images revealed material compactness without phase segregation and EDX mapping showed a homogenous structure. Pressed disk electrode fabricated with SiO2/C/CuO nanocomposite material was evaluated as an amperometric non-enzymatic glucose sensor in 0.1M NaOH solution. The linear response range, sensitivity, detection limit, and quantification limit were 0.02–20.0mmolL−1, 0.06μmolL−1, 472μA mmol−1L−1cm−2, and 0.76mmolL−1, respectively. The electrode response time is <1s with the addition of 0.02mmolL−1 glucose. The electrode is chemically stable, exhibits rapid and excellent sensitivity and does not show any interference from coexisting species present in the blood samples. The proposed sensor repeatability was assessed as 1.9% RSD for ten measurements of 13.0mmolL−1 glucose solution. The sensor tested to ascertain glucose in blood serum showed to be a promising tool for the future evolution of non-enzymatic glucose sensors.