Preparation And Application Of Rare Earth Compound Nanoparticles Modified Electrode

Due to the unique character of nanoparticles such as optical, electrical and catalytic character, nanoparticales have attracted much attention of many chemists for their novel application in modified electrode. In this paper, nanoparticles modified electrode has been fabricated by combining nanotechnique with electrochemical method. Besides nanoparticles modified electrode fabricated by us has taken into the study on bio-molecular, neurotransmitter and environmental pollution.First, the La(OH)₃ nanoparticales modified electrodes made by adsorption have been fabricated. The electrochemical behaviors of 1,3-benzenediol (m-dihydroxybenzene) and hydroquinone on the modified electrode have been studied with cyclic voltammetry, different pulse votammetry and electrochemical impedance spectroscopy. It showed that 1,3-benzenediol (m-dihydroxybenzene) and hydroquinone can be quantitatively determined with La(OH)₃ nanoparticles modified electrode and the detection limit is 2.0×10^-8mol/L and 3.0×10^-8mol/L, respectively. The application in determination of hydroquinone and 1,3-benzenediol (m-dihydroxybenzene) in imitative waste water sample is satisfied. Besides, the catalytic mechanism is discussed primarily.Secondly, the preparation and application of LaFeO₃ nanoparticles modified electrode has been discussed. LaFeO₃ nanoparticles modified electrode is fabricated by adsorption. The electrochemical behavior of DA on this modified electrode is investigated and the result shows that it also can eliminate the interference of AA and then DA can be determined selectively. It is applied in the sample determination and the result is satisfied with us.Last, fabrication of Eu₂S₃ nanoparticles and their application in the determination of DNA are studied. The Eu₂S₃ nanoparticles were successfully labeled to a 5'- amino group capped oligonucleotides probe. The DNA genetic sensing assay relies on the target oligonucleotides on the glassy carbon electrode (GCE) hybridized with the Eu₂S₃ nanocluster-oligonucleotides DNA probe. Hybridization events between the probe and target were monitored by the release of the Eu₂S₃ anchored on the hybrids by oxidative dissolution and the indirect determination of the solubilized Eu³⁺ ions by sensitive anodicstripping voltammetry (ASV).