| Summary: | 碩士 === 長庚大學 === 化工與材料工程研究所 === 91 === The use of sensing chemistry will determine the sensitivity and reliability of a practical chemical sensor or biosensor and a lower weight (greater portability) and lower manufacturing cost (less materials) can be achieved by using luminescence sensing chemistry. The emission of electrochemical luminescence is caused by the recombination between the electrons and the injected holes. The intensity of emission was changed with the voltage and current density. It can be shift the chemistry energy to photon through the voltage control of electrode. The fundament of the liquid-solid electrochemical interfaces may open a new dimension of luminescence phenomena.
In this article, we discussed two types of reaction system. One is Ru(bpy)32+/S2O82- system, the other is ZnGa2O4 /S2O82- system. The electrogenerated chemiluminescence produced in acetonitrile-water solution (1:1 by volume) by the reaction of electrogenerated Ru(bpy)3+ with the strongly oxidizing intermediate, SO4-., generated during reduction of S2O82-. The orange luminescence was observed with a peak at 619 nm corresponds to emission from Ru(bpy)32+*.
Under cathodic polarization in S2O82- electrolyte solution, electrochemical luminescence was observed with a peak at 515 nm for the ZnGa2O4. The electrochemical luminescence is ascribed to the recombination between the electrons in the conduction band and the holes in the valence band for ZnGa2O4.
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