Browsing by Author "Peng, CW"

Now showing 1 - 6 of 6

Elongation of arrays of amorphous carbon tubes
(2005-10-01)
Wang, LS
;
Wang, CH
;
Peng, CW
;
Lee, CY
;
Chiu, HT
Polygon building block route to sp(2)-carbon-based materials
(2001-07-18)
Lee, CY
;
Chiu, HT
;
Peng, CW
;
Yen, MY
;
Chang, YH
Pentagonal- and hexogonal-shaped building block precursors provide a novel, high-yield method for the preparation of carbon onions and nanosized graphite particles. A reaction of hexachlorocyclopentadiene (C5Cl6) with sodium (see Figure) offers carbon onions with 8-50 spherical and elliptical shells. The same reaction with hexachlorobenzene (C6Cl6) results in a mixture of graphite crystallites. [GRAPHICS]
SiCl3CCl3 as a novel precursor for chemical vapor deposition of amorphous carbon films.
(2002-04-07)
Chiu, HT
;
Chang, YH
;
Wang, LS
;
Peng, CW
;
Lee, CY
Synthesis of silicon carbide nanostructures via a simplified Yajima process - Reaction at the vapor-liquid interface
(2005-02-23)
Wang, CH
;
Chang, YH
;
Yen, MY
;
Peng, CW
;
Lee, CY
A preceramic polymer route developed in 1975 has been simplified to efficiently generate beta-SiC nanostructures, including cubic cages (see Figure), cubic shells, and nanoparticles. The nanostructures are generated by the reaction of liquid sodium with the vapors of methylchlorosilanes, with the morphology of the resulting nanostructures dependent upon the interactions between the phase-separated solid products generated at the interface of the vapor-liquid/solid reactions.
Synthesis of sp(2) carbon nano- and microrods with novel structure and morphology
(2003)
Chang, YH
;
Chiu, HT
;
Wang, LS
;
Wan, CY
;
Peng, CW
A unique form of carbon rods has been synthesized by reacting C6Cl6 with Li at 523 K. TEM images show that the structure is graphite-like, with the layers arranged perpendicular to the long axis of the rods. The average rod size is 0.3 x 6 5 mm. The larger ones are 1 x 10 mum. The ratio of graphite-like to disordered carbon atoms, determined by solid-state C-13 NMR, is 1:1.
Tetrahydrofuran activation assisted synthesis of nanosized lithium niobate and lithium tantalate
(2006-04-01)
Chien, CH
;
Chang, YH
;
Tsai, CP
;
Peng, CW
;
Wang, LS
Black solid precursors obtained from reactions between MCl5 (M = Nb, Ta) and alkyllithiums, n-butyllithium ((BuLi)-Bu-n) and ethyllithium (EtLi), in tetrahydrofuran (THF) were heat treated under vacuum at 673-973 K to form nano-sized particles (20-100 nm in diameter) of lithium niobate (LiNbO3) and lithium tantalate (LiTaO3). Stoichiometry of the reactants is critical and affects the phases of the products. Based on the volatile byproducts detected, a reaction pathway involving the activation of THF by alkyllithiums is proposed to be important for the formation of LiNbO3 and LiTaO3 precursors.