A Trehalose Quantitative Sensor Based on Ni Foam Material Modified with Graphene Oxidated and Non-linear Analysis Model

In this paper, a novel trehalose sensor based on micro/nano-Ni foam modified with graphene oxidated (GO) and a non-linear data analysis model was proposed. A three-electrode electrochemical detection system, GO-modified Ni foam material as the working electrode, Ag/AgCl (saturated KCl) electrode as the reference electrode, and Pt electrode as the counter electrode, was utilized as a detecting system. Trehalose with different concentrations was measured by cyclic voltammetry (CV) and amperometric i-t curve (i-t) methods. Results showed that the sensitivity of the proposed sensor was 1.66 ± 0.07 mA cm −2 Mm −1 , and the detecting limit was 37.1 μM ( S / N = 3). The sensitivity of the unmodified Ni foam electrode was 0.23 ± 0.01 mA cm −2 mM −1 , and the detecting limit was 52.3 μM ( S / N = 3). Results demonstrated that GO-modified Ni foam electrode presented higher sensitivity and lower detecting limit than unmodified Ni foam electrode. Control experiments indicated that they presented specific responses to trehalose. It has some advantages including quick response, high sensitivity, and low detection limit.