Synthesis Of Cupric Oxide And Its Application In Electrochemical Detection Of Composite Materials

With the improvement of people’s living standards,food safety issues have become the focus of society and have received more and more attention.In the food production process,in order to keep food fresh and diversified in color and attract more customers’attention,adding nitrite（NO₂^-）and amaranth pigment has become a necessary means.Electrochemical analysis is the most commonly used detection and analysis method in food safety detection,so the construction of electrochemical sensors has become the top priority among them.For electrochemical sensors,electrode modification materials are the most important component,which can determine the performance of electrochemical sensors to a large extent.This paper proposes a method for the synthesis of a new type of copper oxide（CuO）,using copper acetate as the copper source with sodium hydroxide and glacial acetic acid to synthesize materials,using a variety of material characterization methods,and verifying that the shape of the prepared material is a cypress-like nanostructure.The composition is CuO.In this article,this article abandons the traditional laboratory electrodes and chooses self-made flexible printed electrodes to meet the requirements of batch production and disposable use.The nano-characteristics and multi-level structure of cypress-shaped nano CuO play an important role in improving the performance of the sensor due to its small size effect.In order to further improve the performance of the sensor,when using CuO to modify the electrode,a small amount of multi-walled carbon nanotubes were added to construct a CuO/MWCNTs electrochemical sensor electrode.In this paper,CuO/MWCNTs electrode is applied to the test analysis of small concentration of NO₂^-and amaranth.The electrode realizes the low concentration detection of NO₂^-at 0.9 V.The minimum detection limit of the sensor can reach 0.039μM,and it has a good linear response from 0.1 to 6500μM.The electrode realizes the detection of amaranth at-0.1V,which can reach a high sensitivity of1025μA.m M^-1.cm^-2,and the detection limit is as low as 0.019μM.Using this electrode to detect the content of NO₂^-and amaranth,the results are relatively satisfactory.