Photocatalytic and Glucose Sensing Properties of ZnO-Based Nanocoating

Abstract

Here, we report a simple and versatile synthesis of low-dimensional ZnO nanosheet (NS) arrays modified with Fe2O3 (hematite) to assemble photocatalytic coatings and non-enzymatic glucose sensors. Photocatalytic coatings made of widespread elements (zinc and iron) were tested for methylene blue (MB) dye decolorization under ultraviolet and visible (UV-vis) irradiation. A comparative study of unmodified and modified ZnO NS photocatalysts revealed a significant decrease in the dye concentration in 180 min when ZnO/Fe2O3 arrays were used. Size dependence efficiency of the hematite layer deposited onto ZnO is presented. A study of the sensitivity of biosensors made of ZnO nanostructures and ZnO/Fe2O3 nanocomposites for glucose detection showed an improvement in sensitivity with increased Fe2O3 thickness. The structure and morphology of low-dimensional coatings were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDX). The optical properties of nanoarrays showed a red shift of absorption after modifying ZnO with hematite layers, which holds good promise for expanding photocatalytic activity in the visible region.

Enhancing the Electrochemical Performance of ZnO-Co3O4 and Zn-Co-O Supercapacitor Electrodes Due to the In Situ Electrochemical Etching Process and the Formation of Co3O4 Nanoparticles

“…The application of ZnO and its composites in photocatalysis, water splitting, and Oxygen Evolution Reaction is discussed in [15][16][17][18][19]. Many reviews and research studies have discussed the use of ZnO in gas and chemical sensors [20][21][22], and in bio-sensors [23][24][25][26][27][28][29][30][31]. Different articles and reviews have also been published on the prospects of its applications in photodetectors [32][33][34][35][36][37] and solar cells [38][39][40].…”

Effect of Hydrogen Plasma Treatment on the Sensitivity of ZnO Based Electrochemical Non-Enzymatic Biosensor

“…The development of electrochemical biosensors based on thin films and zinc oxide ZnO nanostructures has been the subject of many studies [ 11 , 14 , 15 , 16 , 17 , 18 , 19 ]. The use of nanomaterials has modernized the signal transmission approach in biosensors, which has resulted in the improved sensitivity and performance of biosensors [ 20 , 21 , 22 ].…”

“…This high isoelectric point contributes to a high uptake of proteins, enzymes, and DNA due to electrostatic interactions [ 27 ]. These types of biosensors are often used to detect analyte types such as cancer cells, uric acid, cholesterol, ascorbic acid, and glucose [ 19 , 25 , 28 , 29 , 30 ]. ZnO is an important multifunctional nanomaterial and is used in optical and electrochemical biosensors [ 15 , 28 ].…”

STRUCTURAL PROPERTIES OF ZnO NANOPOWDERS SYNTHESIZED BY THERMAL DECOMPOSITION

“…Transition metal ions usually possess unfilled d-shells, which provides reactive electronic transitions, wide bandgap, excellent electrical characteristics and high dielectric constant [3]. Metal-oxide nanomaterials possess exceptional and tunable optoelectronic, optical, electrical, thermal, magnetic, catalytic, mechanical, and photochemical properties, enabling them to be used with high efficiency to produce sensors [4,5], fuel cells, batteries, supercapacitors, and optical devices [6]. The above wide range of applications is also due to the high surface density of these nanostructures [7].…”