Alumina sandpaper-supported nickel nanocoatings and its excellent application in non-enzymatic glucose sensing

Abstract A novel non-enzymatic glucose sensor was developed based on sandpaper-supported nickel coatings (SNC). Superhydrophilic network was formed on the surface of sandpaper via a simple laser-scribing (LS) method. Orthogonal model was utilized to optimize the processing parameters for preparing SNC with an optimal conductivity of 4.20 × 106 S·m−1. The surface morphology, functional groups and elements of SNC were characterized by SEM, ATR-FTIR and XPS respectively. The crystallinity of nickel nanocoating was determined by XRD. Remarkably, the SNC exhibited favorable electrocatalytic performance with a wide linear range (LR) of 0.01–4.3 mM, a high sensitivity of 1163.3 μA mM−1 cm−2 and a low limit of detection (LOD) of 0.250 μM, which was measured by standard electrochemical measurements. Low relative standard deviation (0.59% and 0.72%, n = 6) and high recoveries (96.30–97.78%) verified its stability and reusability, which can meet the needs of daily uses. Finally, successful application of the SNC to the analysis of glucose in human serum samples, leading to a promising tool for non-enzymatic glucose determination in healthcare and food industries.

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