报告主题:Electrospun nanofiber composed of carbon quantum dots

报告时间:2015年3月27日上午10点

报告地点:纺织学院3004

报告人及简介:Hak Yong Kim Ph.D., Professor    Chonbuk National University (CBNU)

Dr. Kim has completed his PhD from Textile Eng., Seoul National University, Korea. He is professor at Department of BIN Fusion Technology &Department of Organic Materials and Fiber at Chonbuk National University. He has published more than 290 papers in reputed journals (h-index 39) and has been serving as an editorial board member of three international journals (Macromolecular Research, Fibers and Polymers, Korean Tissue Engineering and Regenerative Medicine Society). His research interests including: Biomaterials, Polymer composites, Inorganic materials, Carbon nanofibers, Functional materials like Semiconductor, Electrocatalytic, Phocatalytic materials, Hydrogen and fuel cells.

报告大纲:Novel photoluminescence (PL) composite nanofibers (NFs) consist of carbon qunatum dots (CQDs) and polyacrylonitrile blend with polyacrylic acid (PAN/PAA) were fabricated by the coelectrospinning process. The air-dried CQDs containing NFs were characterized by field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), UV-visible spectroscopy, spectrofluorometer, and confocal microscopy. CQDs are familiar to emit blue, green and red color depending on the excitation energy. The PAN/PAA/CQDs NFs were found to be optically transparent and exhibited PL properties similar to CQDs. Therefore, blue, green and red color was observed under confocal microscope from the NFs membrane while the sample was excited by 405 nm, 488 nm and 543 nm lasers. The results indicated the well preserved quantum confinement properties of the CQDs inside the polymer matrix without aggregation or substantial quantum dots growth.