부산대학교 도서관

In Chapter 1, we have synthesized the siloles derivatives to develop a new optical probe for florescence turn off detection biomolecules. 1-methyl-1-hydro-2,3,4,5-tetra- phenyl silole were derived with allylamines to give amine functionalized silole via hydrosilylation. Amine-functionalized silole were further derived with biotin to give biotin-functionalized silole. These biotin-functionalized molecules were used for the detection of biomolecules such as avidin and streptavidin through the quenching of photoluminescence. Our results indicated that biotinylated-silole nano aggregate are highly sensitive and selective to detect the avidin/streptavidin without any other interference. In chapter 2, we have described the Silole derivatives have an optical and electrical properties which is useful in electronic devices, such as electron transporting materials, light-emitting diodes (LEDs), and chemical sensors. New synthetic routs for silole-derivatized graphene oxide have been developed from the hydrosilylation reaction of 1-methyl-1-aminopropyl-tetraphenylsilole with graphene oxide. Photoluminescence behaviors for the 1-methyl-1-aminopropyl-tetraphenylsilole, graphene oxide, and silole-derivatized graphene oxide were investigated by the measurement of photoluminescence. Prepared graphene oxide and 1-methyl-1-aminopropyl-tetraphenylsilole displayed an emission band at 295 and 480 nm, respectively. Optical behavior of silole-derivatized graphene oxide were investigated by the absorption and fluorescence spectroscopy. The silole-derivatized graphene oxide showed an interesting optical properties. Energy migration by an electron transfer between graphene oxide and silole moiety was observed. The silole-derivatized graphene oxide was further characterized by UV-vis and IR spectroscopy as well as the surface electron micrograph and transmission electron micrograph. Further details for the electronic behaviors of silole-derivatized graphene oxide and reduction to the silole-derivatized graphene will be discussed. In chapter 3, we have discussed the Nanocrystalline porous silicon (PSi) surfaces used to detect nitroaromatic compounds in vapor phase. The mode of photoluminescence (PL) is emphasized as a sensing attitude or detection technique. Quenching of PL from nanocrystalline porous surfaces as a transduction mode is measured upon the exposure of nitroaromatic compounds. To verify the detection of explosives, the surface of PSi is functionalized with different groups. The quenching mechanism of PL is attributed to the electron transfer behaviors of quantum-sized nano-crystallites in the PSi matrix to the analytes (nitroaromatics). An attempt has been done to prove that the surface-derivatized photoluminescent PSi surfaces can act as versatile substrates for sensing behaviors due to having a large surface area and highly sensitive transduction mode. The detection of analyte was achieved by means of photoluminescence quenching of PSi. The quenching efficiency is in the order of TNT > PA > DNT. The electron transfer efficiency is in the order of PA > TNT > DNT.