Hierarchical Structures Composed of Cu(OH)₂ Nanograss within Directional Microporous Cu for Glucose Sensing

Abstract

Cu(OH)2 nanomaterials are widely investigated for non-enzymatic glucose sensors due to their low-cost and excellent performance. Cu(OH)2 nanomaterials usually grow on substrates to form sensor electrodes. Reported works mainly focus on structure adjusting of the Cu(OH)2 nanostructures, while the optimization of substrates is still lacking. In the present work, directional porous Cu (DPC) was applied as the substrate for the growth of Cu(OH)2 nanograss (NG), and hierarchical structures of Cu(OH)2@DPC were prepared by alkaline oxidation. The morphology and microstructure evolution of the prepared hierarchical structures was investigated, and the non-enzymatic glucose sensing performance was evaluated. Cu(OH)2@DPC exhibits enhanced comprehensive non-enzymatic glucose sensing performance compared to the reported ones, which may benefit from both the effective adsorption of the Cu(OH)2 NG with a relatively high surface area and the high solute exchange of the DPC by a channel effect. This work provides new insights into the further improvement of the non-enzymatic glucose sensing performance of Cu(OH)2 nanostructures by optimizing the substrate structure.

Metal Oxides Nanomaterials and Nanocomposite-Based Electrochemical Sensors for Healthcare Applications

“…Typically, the electrocatalytic properties of the metal oxide nanocomposites are closely related to the active sites, electrochemical active surface area, surface energy, etc. [4][5][6]. To attain high sensing performance properties of the metal oxides-based nanocomposites, the catalytic materials have been prepared as small as possible to grow more available active sites and available surface area [7][8][9].…”

“…The enhanced catalytic activity is associated with the synergetic effect that occurs at the interface of metal and oxide support. It is supposed that the electronic structures can be altered via the deposition of noble metal on metal oxide nanomaterials as metal nanocomposites, offering growth to oxygen vacancies on the interfacial [4,13]. The solution dispensation of great excellence freestanding thin films via vacuum filtration, spin coating, drop casting, spray-coating, etc., shows a key role in various electrochemical sensor applications.…”

Nanostructure-Based Solution Sensor Fabricated with p-CuOx/n-TiO2 Nanojunctions To Identify Species and Concentrations of Alcohol Molecules

“…The sensing mechanism of MOS-based sensors mainly originates from the change in resistance caused by interactions between the analyte molecules and the MOS surface. , In addition, MOS materials that function as photocatalysts or chemical catalysts , enhance the adsorption and desorption of molecules on their surfaces. Thus, their sensing performance substantially depends on surface-related factors, such as the geometric structure and surface functionalization. − Previously, MOS sensors having p – n junctions formed by combining p - and n -type materials on the sensors’ surfaces have been reported. − For example, the combination of p -CuO NWs with n -ZnO nanoparticles leads to the highly sensitive and fast detection of NO 2 gas, and the combination of n -TiO 2 nanotubes with p -CuO nanoparticles leads to the highly sensitive and minimum detection limit of H 2 S gas . Furthermore, the combination of p -Mn 3 O 4 , n -Fe 2 O 3 , and n -ZnO reportedly enables the identification of NO 2 and NH 3 gases .…”