| With the social progress of science and technology, people’s pursuit of life qualityis getting higher and higher. At the same time, various environmental pollutionproblems are increasingly serious with the economic development. Aldehydes is a kindof carcinogenic and deformity caused by the highly toxic material, and threat to humanhealth seriously. So it’s very meaningful to establish fast and accurate analysis ofaldehyde detection method. As a new kind of detection tool, electrochemical sensorshave advantages of high selectivity and sensitivity, and simple preparation, easy toimplement online monitoring and rapid detection. Electrochemical sensors are widelyused in various fields, such as biomedical, clinical diagnostics and environmentalmonitoring, and other fields. Nanometer sized materials, which have effects ofmacroscopic quantum tunnel effect, surface effect, quantum confinement effect andsmall size effect, are different from common sized materials on magnetic, electrical,thermal, optical, mechanical properties. The intervention of nanotechnology providesrich changes for the development of electrochemical sensors.In this paper, the electrodes modified with noble metal nanometer sized materials,which prepared by electrodeposition of noble metal salt mixture, were constructed.Their structure and properties were investigated with electron microscopy andelectrochemical characterization methods. The main contents of this paper have beendescribed as follows:①Construction and research of formaldehyde electrochemical sensor baseon nano Platinum-L-alanineNano Platinum modified GCE was constructed by cyclic voltammetryelectrochemical method. The electrocatalytic oxidation of formaldehyde with L-alaninein the interface of the electrode was studied. The result showed that the electrochemicalsignal response of formaldehyde on the sensor was obvious. The oxidative peak currentof formaldehyde is linear to the concentration ranging from2.00×10-5to5.50×10-3mol·L-1with a detection limit of4.2×10-6mol·L-1. At the same time, the formaldehydecontent in real samples was detected accurately. The sensor has advantages of goodstability, good selectivity and high sensitivity.②Construction and application of formaldehyde sensor using Prussian bluemembrane/nano Platinum A novel electrochemical sensor for formaldehyde was constructed based onPrussian blue membrane （PB） and nano Platinum. The result showed that the oxidationcurrent was linearly related to the concentration form3.125×10-5to1.00×10-3mol·L-1with a detection limit of7.86×10-6mol·L-1. The electrochemical sensor has advantagesof simple manufacture, convenient operation and good stability.③The catalytic oxidation of formaldehyde on nano Gold/L-histidine modifiedGCEA nano Gold/L-histidine modified GCE for formaldehyde was constructed bycontrolled potential electrolysis coulomb method. The result showed that the linearrange is5.00×10-5to1.00×10-3mol·L-1and the detection limit is3.21×10-6mol·L-1. Thismodified electrode has good stability and can be used as a novel electrochemicalmethod for formaldehyde detection.④Preparation and application of formaldehyde sensor based on silvernanoparticles doped L-valine/malachite green modified Platinum electrodeA silver nanoparticles doped L-valine/malachite green electrochemical sensor wasprepared using electrochemical method. Formaldehyde on the sensor was studied and asensitive peak current appeared an about+0.10V. The peak current was linearly relatedto the concentration of7.00×10-6to5.00×10-3mol·L-1with a detection limit of5.00×10-7mol·L-1. So this modified electrode can be developed as a rapid, accurate detectionmethod for formaldehyde. |
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