Preparation and characterization of hierarchical nanostructures composed by CuO nanowires within directional microporous Cu

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

“…Feature peaks corresponding to Cu were indexed in the XRD spectrum of the DPC in Figure a. Due to the thermal gradient along the deposition direction, there is a (100) texture in the DPC, which is consistent with previous reports. − After alkaline oxidation, the feature peaks of Cu remains in the XRD spectra, and new peaks with relatively low intensity appear, indicating that some new phases formed during alkaline oxidation. The enlarged XRD spectra with a range of 20–40° are shown in Figure b, where nearly no peaks can be observed on the spectra of DPC, Sample-30s, and Sample-1min.…”

“…After fitting, it can be found that the ECSA of the DPC is very similar to that of CuO@DPC, and the ECSA of Cu­(OH) 2 @DPC is more than 20% higher than those of the DPC and CuO@DPC. Thus, the high sensitivity of Cu­(OH) 2 @DPC benefits from the effective adsorption of the Cu­(OH) 2 NG with a higher surface area and the enhanced solute exchange of the DPC by the channel effect. , These two effects synergistically accelerate the electrochemical reaction of glucose. Besides that, Cu­(OH) 2 is easier to oxidize into CuOOH than CuO, which results in Cu­(OH) 2 @DPC exhibiting a higher activity.…”

“…As shown in Figure 1, a hierarchical porous Cu (HPC) sample composed of DPC and nanoporous Cu was prepared by one-step etching 3D printed Fe−Cu alloy with a two-stage liquid phase separation structure, and the detailed experimental procedure can be found elsewhere. 23 Subsequently, the HPC sample was subjected to ultrasonic treatment to remove the nanoporous Cu, 22 and a DPC sample with an area of 10 mm × 4 mm and a thickness of 1 mm was obtained. Then, the remaining DPC samples were immersed in an aqueous mixture of 0.1 M ammonium peroxydisulfate ((NH 4 ) 2 S 2 O 8 ) and 0.5 M sodium hydroxide (NaOH) for alkaline oxidation at room temperature.…”

“…17 By replacing the porous Cu into directional porous Cu (DPC), the sensing performance of composite electrodes may improve by promoting the transmission of the solution and the reaction product through the channel effect. Thus, the DPC 22,23 prepared by 3D printing and dealloying technology was selected as the substrate in the present paper. We report the preparation, morphology evolution, and demonstration of hierarchical structures of Cu(OH) 2 @DPC capable of serving as non-enzymatic glucose sensors with enhanced comprehensive performance.…”

Salt spray corrosion behavior and electrochemical performance of Al and Ti reinforced Ni60 coating by laser cladding

“…The iron oxides were very loose due to the volume expansion in the oxidation process, which did not effectively prevent the corrosion process. The addition of Al easily formed a dense Al 2 O 3 protective film on the Ni60–Al coating, which slowed down the corrosion progress to a certain extent, [ 27,28 ] as shown in Figure 7b. The O and Ti with the strong affinity were oxidized to form a TiO 2 protective layer, which further protected the integrity of the coating surface, [ 29 ] as shown in Figure 7c.…”