脈衝雷射於四乙基正矽酸鹽中合成碳氧氫摻雜矽奈米結晶和球狀石墨烯

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脈衝雷射於四乙基正矽酸鹽中合成碳氧氫摻雜矽奈米結晶和球狀石墨烯

C-O-H-doped Si nanocrystals and spherulitic graphene by pulsed laser ablation of SiC in TEOS

劉家如 , Masters　　Advisor：沈博彥　　

繁體中文

四乙基正矽酸鹽；石墨烯；矽奈米結晶；碳化矽；脈衝雷射剝熔蝕； Si nanocrystal ； silicon carbide ； graphene ； pulsed laser ablation ； TEOS

Abstract │ Reference (71) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Pulsed laser ablation of 6H-type SiC single crystal wafer in TEOS was employed to synthesize diamond-type nanocondensates/particulates with varied Si-C-O-H content and turbostratic graphene coverage. Analytical electron microscopic observations indicated that such nanocondensates/particulates have varied lattice parameters (0.523-0.548 nm) with accompanied modification of optoelectronic properties, i.e. Raman shift (487, 511 cm-1), photoluminescence (532, 603 nm)and violet light absorbance corresponding to a minimum band gap of 3.1 eV. The Si-rich nanoparticles have paracrystalline distribution of defect clusters and occasional shock-induced 4x(111) faulting. In general, the Si-C alloyed diamond type particles have well-developed ~{111} and ~{110} vicinal surfaces (such as 311, 331, 123) for (hkl)-specific coalescence as special grain boundaries, i.e. (110) 70.5º twist boundary and [111](123)/(011) tilt boundary. Turbostratic graphene also occurred as folding belts and spherulite which typically retained bimodal basal spacings 0.341 nm and 0.366 nm after Si-O-H doping and/or layer corrugations upon constitutional supercooling. Moissanite (3C-SiC) and diamond polycrystals up to several microns in size with triple junctions, a characteristic of solid-state sintering, were also identified by scanning electron microscopy coupled with Raman and PL spectroscopy. High-temperature formation of crystalline silica, such as cristobalite with cubic and/or tetragonal structures, was not favored in TEOS environment.

Reference ( 71 ) 〈TOP〉

Adachi S., “Optical constants of crystalline and amorphous semiconductors: numerical data and graphical information” Springer, 1999.
連結：
Alkis S., Okyay A.K., Ortaç B., “Post-treatment of silicon nanocrystals produced by ultra-short pulsed laser ablation in liquid: Toward blue luminescent nanocrystal generation” J. Phys. Chem. C 116 (2012) 3432-3436.
連結：
Anders E., Zinner E., “Interstellar grains in primitive meteorites: diamond, silicon carbide and graphite” Meteoritics and Planetary Science 28 (1993) 490-514.
連結：
Bryan J.D., Gamelin D.R., “Doped semiconductor nanocrystals: synthesis, characterization, physical properties, and applications” Prog. Inorg. Chem. 54 (2005) 47-126.
連結：
Chen C.H., Huang C.N., Chen S.Y., Shen P., “Crystallographic shear of polymorphic TiO2 nanocondensates with enhanced Cr2O3 dissolution via pulsed laser ablation” J. Nanoparticle Res. 13 (2011) 3683-3692.
連結：

Times Cited (1) 〈TOP〉

方春瀅(2016)。脈衝雷射於真空及四乙基正矽酸鹽環境中剝熔蝕氮化鋁多晶靶材造成的凝聚與結晶行為。中山大學材料與光電科學學系研究所學位論文。2016。1-78。

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