奈米碳材料之製備與其在鋰離子電池和LED之應用

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奈米碳材料之製備與其在鋰離子電池和LED之應用

Synthesis and Applications of Nano Carbon Materials: Li-ion Batteries and Light-emitting Diodes

林品均 , Ph.D　　Advisor：劉偉仁　　

英文

石墨烯；奈米碳管；鋰離子電池；負極材料；黃柏；螢光粉；白光發光二極體； Graphene ； carbon nanotubes ； jet cavitation ； lithium-ion batteries ； Phellodendron ； phosphor ； light-emitting diodes

Abstract │ Reference (214) │ Altmetrics

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Environmental protection is a very important issue for now. For the sake of response these situations, several research efforts have been carried out and elaborated. In this thesis, we propose two methods to synthesize graphene nano-flakes (GNFs) and few layer graphene (FLG) by using cost-effective and chemical free method. For GNFs, the results indicated that the size of as-synthesized GNFs was approximately 40-50 nm. Furthermore, we also use first principles calculations to understand the transformation from CNTs to GNFs from viewpoints of the edge formation energies of GNFs in different shapes and sizes. The corresponding photoluminescence of GNFs are carried out in this study. 
A green, facile, low-cost and scalable industrial method using jet cavitation (JC) is utilized to prepare few layer graphene (FLG) through natural graphite delamination in deionized (DI) water. This research probes the effects of critical experimental parameters. JC method provides massive production of FLG with high yield using initial concentration of 10 wt.% under various high jet pressures (200 MPa). It revealed that up to 85% of the prepared FLG were less than 5 nm thick and most of FLG were belong to 10 layers by atomic force microscopy (AFM) analysis. Moreover, the delaminated of FLG might be applied as potential anode materials in the LIB. In this study, we test the graphene-based (FLG) anode material for lithium ion battery.
We disclose a rare-earth free and yellow-emission phosphor, Phellodendron, which could be both excited by near ultraviolet light and blue light. The new yellow phosphor is obtained by extraction of Phellodendron chinense Schneid. The emission wavelength, full width at half maximum and CIE coordinates of extracted Phellodendron are 540 nm, 120 nm and (0.41, 0.55), respectively. The corresponding luminescent properties of Phellodendron are characterized by PL, PLE, reflection spectra, FITR and decay lifetime. Surprising thing is luminous intensity of Phellodendron phosphors excited at 380 nm was stronger than YAG:Ce3+ phosphor by more than 139%. In addition, we firstly introduce the yellow phosphor in white LED fabrication by combining blue chip and YAG:Ce3+ phosphor, to create warm white. For comparison, red-emission CaAlSiN3:Eu2+ phosphors are also introduced for LED package tests. The results demonstrate that Phellodendron is a potential candidate for white LED applications.

Reference ( 214 ) 〈TOP〉

2 Ermis, K., Midilli, A., Dincer, I. & Rosen, M. Artificial neural network analysis of world green energy use. Energy Policy 35, 1731-1743 (2007).
連結：
3 Midilli, A., Dincer, I. & Ay, M. Green energy strategies for sustainable development. Energy Policy 34, 3623-3633 (2006).
連結：
4 Midilli, A., Ay, M., Dincer, I. & Rosen, M. On hydrogen and hydrogen energy strategies: I: current status and needs. Renewable and sustainable energy reviews 9, 255-271 (2005).
連結：
5 Gong, X., Liu, G., Li, Y., Yu, D. Y. W. & Teoh, W. Y. Functionalized-graphene composites: Fabrication and applications in sustainable energy and environment. Chem. Mater. 28, 8082-8118 (2016).
連結：
6 Geim, A. K. & Novoselov, K. S. The rise of graphene. Nature materials 6, 183-191 (2007).
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