Abstract

The production of a nanomaterial with enhanced and desirable electrocatalytic properties is of prime importance, and the commercialization of devices containing these materials is a challenging task. In this study, unique cupric oxide (CuO) nanostructures were synthesized using lysine as a soft template for the evolution of morphology via a rapid and boiled hydrothermal method. The morphology and structure of the synthesized CuO nanomaterial were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The prepared CuO nanostructures showed high potential for use in the electrocatalytic oxidation of glucose in an alkaline medium. The proposed enzyme-free glucose sensor demonstrated a robust response to glucose with a wide linear range and high sensitivity, selectivity, stability, and reproducibility. To explore its practical feasibility, the glucose content of serum samples was successfully determined using the enzyme-free sensor. An analytical recovery method was used to measure the actual glucose from the serum samples, and the results were satisfactory. Moreover, the presented glucose sensor has high chemical stability and can be reused for repetitive measurements. This study introduces an enzyme-free glucose sensor as an alternative tool for clinical glucose quantification.

Highlights

  • Exploring the physicochemical features of nano-dimensional materials with controlled morphology, size, and specificity is a challenging and demanding task [1]

  • 2 ·2H2 O was with 1 g Lysine-assisted lysine

  • The resulting cupric oxide (CuO) nanomaterial was rinsed with treatment in a pre-heated electric oven at chemical growth methodology

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Summary

Introduction

Exploring the physicochemical features of nano-dimensional materials with controlled morphology, size, and specificity is a challenging and demanding task [1]. Among the various transition metal oxides, cupric oxide nanostructures have received great attention from the scientific community for their wide range of applications, including uses in antimicrobials [3,4], chemical and biological sensors [5,6], optoelectronics [7], and photonic and electronic devices [8]. Cupric oxide nanostructures possess desirable properties such as high surface-to-volume ratios, conductivity, and cost effectiveness [3]. The controlled morphology of copper oxide at nanoscale dimensions may significantly affect catalytic, optical, and electrical characteristic and may do so at low cost [9]. CuO nanostructures exhibit a narrow band gap (1.2–1.6 eV) with enhanced catalytic performance and good chemical stability [10].

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