Organic Semiconductor Micro/Nanostructures: Controllable Construction And Electrochemil Uminescent Properties

Due to excellent electrochemiluminescent properties and potential application in biosensors, organic semiconductor micro/nanostructures have attracted more and more attention over the past years. It has become a very hot issue on how to improve the electrochemiluminescent properties of organic semiconductor micro/nanostructures and to realize their application in sensor.In this dissertation, two typical electrochemiluminescent materials were fully investigated, from the electrochemiluminescent properties of these micro/nanostructures to their potential application. A series of micro/nanostructures with controllable sizes and shapes which ranging from one-dimensional wires to two-dimensional plates have been prepared by employing the reprecipitation and physical vapor deposition method. The electrochemiluminescent properties and applications of these micro/nanostructures were investigated through electrochemiluminescence characterizing methods. Their applications including biosensors and logic operation were further expanded. We had made some important achievements which are as follows:(1) We chose rubrene, a typical ECL reagent with high luminescence efficiency, to prepare triclinic and monoclinic nanomaterials by employing the reprecipitation method. The different polymorph of the rubrene nanomaterials(Rubrene NMs) can significantly affect the electrochemiluminescent properties, compared with monoclinic nanoplates(Rubrene NPs), the triclinic nanowires(Rubrene NWs), which have a faster charge transfer and higher surface-to-volume ratios, can significantly improve the electrical conductivity and electro-active area, and hence affect its ECL intensity. Rubrene nanomaterials(Rubrene NMs) applied for the construction of ECL biosensor by immobilizing them onto a indium tin oxide electrode(ITO). After dried in air, the developed biosensor exhibits high ECL efficiency and excellent stability with tripropylamine(TPr A) as co-reactant. The ECL biosensor manifested high sensitive ECL response in a wide linear range with low detection limit, when it was used for the detection of creatinine, dopamine(DA) and methylene blue(MB). The detection limit for creatinine, DA and MB is 3.4×10-14 M, 3.1×10-13 M and 3.1×10-12 M respectively.(2) We chose BPEA, a typical ECL reagent with high luminescence efficiency, to prepare nanowires with large surface-to-volume ratios by employing the physical vapor deposition method, which were subsequently applied for the construction of ECL biosensor by immobilizing them onto a indium tin oxide electrode(ITO), when it was used for the detection of proline(Pro), dopamine(DA) and methylene blue(MB). The detection limit for creatinine, DA and MB is 6.4×10-7 M, 2.0×10-12 M and 4.4×10-11 M, respectively. The different electrochemiluminescent logic operation can be used for identify the creatinine, DA and MB.