| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018) | |
| Nanomaterials | Wednesday Sessions |
| Session NM-WeP |
| Session: | Nanomaterials Poster Session II |
| Presenter: | Takafumi Yasuzawa, Tokyo Denki University, Japan |
| Authors: | T. Yasuzawa, Tokyo Denki University, Japan K. Sato, Tokyo Denki University, Japan |
| Correspondent: | Click to Email |
In recent years, magnetofluorescent materials have attracted attention as one of a powerful tool to provide simultaneously diagnosis and treatment of cancer cells such as image diagnosis using fluorescence property and thermotherapy using magnetism property. We have developed the magnetofluorescent microparticles in which fluorescent ammonium silicon fluorides ((NH4)2SiF6) were formed on the surface of the ferromagnetic magnetite (Fe3O4) layer, which applied on the Si substrates. This microparticles have some serious challenges; for instance, emission of only single light (red-orange color) and poor magnetic response due to the formation of the diamagnetic ferric fluoride (FeF3) by the chemical reaction between the Fe3O4 and hydrofluoric acid/nitric acid mixture solution during the preparation process. To overcome these challenge, we suggest the approach to combine the phosphorus (P)-doped (NH4)2SiF6, as a novel fluorescent materials, with Fe3O4 without the formation of FeF3. In this presentation, we report the fluorescence color and chemical composition of the magnetofluorescent microparticles. The P-doped (NH4)2SiF6 microparticles were linked with the Fe3O4 using ultrasound cleaner. To vary the fluorescent color of the P-doped (NH4)2SiF6 microparticls, they were immediately treated in vacuum or in atmospheric environments. The fluorescence properties and chemical composition of the obtained microparticles were investigated by using photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS) measurements. The fluorescent color varied from yellow to green light due to the oxidation of the P-doped (NH4)2SiF6 in atmospheric environment. Furthermore, the magnetic component in the micropaticles was composed of only Fe3O4 without the formation of FeF3. Therefore, we suggest that the particles become a highly effective tool of diagnosis and treatment of cancer cells as a novel magnetofluorescent materials.