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In this paper, a facial strategy is employed to directly growing ZnO nanorods (ZnONR) on carbon fiber paper (CFP) and functionalizing with silver nanoparticles (AgNP), constructing a structural stable paper-based electrode (AgNP/ZnONR@CFP). This unique AgNP/ZnONR hierarchical nanoarchitecture provides large surface area and an easy substrate penetrable structure facilitating enhanced electrochemical features towards flavonoids oxidation. When the electrode is evaluated as a binder-free sensor for flavonoids detection, three distinct and separate differential pulse voltammetric peaks for luteolin, daidzein, and baicalein are observed, demonstrating the simultaneous and selective detection of these flavonoids possible. The AgNP/ZnONR@CFP sensor demonstrates a remarkable wide linear relationship with low detection limits for luteolin, daidzein, and baicalein detection in a mixed solution. When the sensor is employed to analyze luteolin, daidzein, or baicalein in real extracts from Japanese Honeysuckle, Soybean, and Chrysanthemum morifolium, satisfactory recovery rates (ranging from 96.3 % to 102.5 %) and low relative standard deviation (RSD) values (less than 5.0 %) are obtained. In addition, an assembled sensor device (two-electrode) based on this trimmable AgNP/ZnONR@CFP electrode exhibits remarkable quick response and excellent sensitivity for luteolin, daidzein, or baicalein detection, facilitating real-time and portable detection, highlighting its great potential in batch production of the sensor devices. [Display omitted] • A binder-free electrode is prepared for simultaneous luteolin, daidzein and baicalein detection. • The sensor exhibits high activity with wide linear range and low detection limit. • A two-electrode sensor device is assembled using the AgNP/ZnONR@CFP electrode. • The novel sensor device allows real-time, portable detection and paves the way for mass production. [ABSTRACT FROM AUTHOR]

In this work, Cu 2 O/CuO hollow microspheres (Cu x OHM) are scattered on the reduced graphene oxide (RGO) nanosheet to form Cu x OHM/RGO hybrid by a simple one-step hydrothermal method. Characterizations of the prepared Cu x OHM/RGO hybrid were performed by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. Cyclic voltammetry and chronoamperometry were employed to investigate the electrocatalytic properties of the Cu x OHM/RGO hybrid. We found that the constructed glucose sensor has a broad linear range of 0.01−14.0 mM (R2 = 0.997), a low detection limit of 1.15 μM and a high sensitivity of 635.315 μA/mM cm2. In comparison with pristine Cu x OHM and RGO, the prepared hybrid glucose sensor showed significantly enhanced electrocatalytic activity. Additionally, the sensor also shows fabulous anti-interference ability, good stability. The excellent electrocatalytic performance together with the simple and low-cost preparation method make Cu x OHM/RGO hybrid be an appealing electrocatalyst in glucose sensor application. [ABSTRACT FROM AUTHOR]