Preparation And Application Of Prickly Cu-based Micro-nano Materials As Electrocatalysts

Diabetes is a kind of metabolic disease,which many millions of people around the world suffer from.Therefore it is important to accurately measure the glucose concentration in the blood of diabetic patients.Most of the existing glucose detection equipments use biological enzymes as a glucose oxidation catalyst.But,because of their characteristics,biological enzymes are susceptible to pH,temperature,interference,and thus non-enzyme catalyst is becoming a general trend.As a non-enzyme catalyst,copper-based materials exhibit good catalytic activity during the oxidation of glucose due to the good electrical conductivity,and the low cost has attracted attention.With the progress of electronic technology toward the miniaturization,high integration and the continuous development of flexibility have become the focus,so higher and higher requirements have been put forward.Electroless copper plating is an indispensable process for the production of integrated circuits where the addition of catalyst for activation is critical.Commonly used commercial activator is Sn / Pd colloid,but Pd is an expensive precious metal and is not conducive to cost control of production processes.Copper-based materials are inexpensive compared to other precious metals,and they have good catalytic activity.In this theis,the micro-nano Cu-based materials with large surface area and more active sites were fabricated by ion modification,oxidation and ultrasonic emulsion electrochemistry methods.Their catalytic effects of on oxidation of glucose and electroless copper plating were investigated.The details of this theis are as follows:1.Cu₂O@CuO-Pd yolk-shell micro-nanostructure materials are synthesized through subsequent oxidation of Cu₂ O octahedron precursors with Pd aqueous solution.Their effect of Pd ion concentration on the electrocatalytic performance as glucose sensor was studied.The crystal structures and microstructure were characterized by X-ray diffraction?XRD?and scanning electron microscopy?SEM?.The results demonstrate that 2.5wt% of Pd concentration resulted in the best morphology,electrocatalytic activity and selectivity for glucose oxidation.The sensitivity,the linear range and the detection limit of the prickly yolk-shell Cu₂O@CuO-Pd micro-nanostructures sensor is 545.8?Acm-2 mM-1,0.01mM⁶.50 mM and 3?M,respectively.2.Novel prickly CuO was fabricated by dry gaseous oxidation.Cu powder was placed in tube furnace and immediately heated to the set temperature.Meanwhile,commercial CuO plates were treated by adding strong oxidant in the liquid phase.The permeable CuO are constructed by radially standing 1D single-crystalline nano thorns.Their crystal structures and microstructures were characterized by XRD and SEM.The results demonstrate that prickly CuO exerts better electrocatalytic activity and selectivity for glucose oxidation than CuO plates.Their sensitivity,linear range and the detection limit of the prickly CuO micro-nanostructures sensor is 612.28 ?Acm-2 mM-1,0.01mM⁶.50 mM and 3?M,respectively.3.Cu powders were synthesized by the ultrasonic emulsion electrochemical method.The effects of pH,current density and surface dispersants on the diameter and morphology of Cu powders were studied.Taper-like Cu powders were prepared.Pd nanoparticles were synthesized and successfully loaded on the Cu powders and form the taper-like Cu-Pd micro-nanostructured materials.They were used for electroless copper deposition experiments.Experimental results showed that they have good performance as activator in electroless copper depositon.