Báo cáo hóa học: " Synthesis of Tapered CdS Nanobelts and CdSe Nanowires with Good Optical Property by Hydrogen-Assisted Thermal Evaporation" docx

... CdS nanobelts and CdSe nanowires, respectively Nanoscale Res Lett (2009) 4:1166–1170 1169 123 NANO EXPRESS Synthesis of Tapered CdS Nanobelts and CdSe Nanowires with Good Optical Property by Hydrogen-Assisted ... The tapered CdS nanobelts and CdSe nanowires with high-quality optical property should be good building blocks for photonic d...

Ngày tải lên: 22/06/2014, 00:20

... 700 0.4 0.6 0.8 1.0 1.2 1.4 0 300 600 900 1200 1500 ).u . a(ytisnetnI. LP ).u.a(ytisnetnI.sbA Wavelength (nm) QY 70% QY 22% CdSe/ ZnS CdSe Fig. 7 Absorption and PL spectra for bare CdSe NCs and corre- sponding CdSe/ ZnS NCs prepared at 120 °C for 10 s Nanoscale Res ... (from 516 to 535 nm) with fairly narrow FWHM of PL (29–36 nm). The overcoating of CdSe NCs with ZnS usual...

Ngày tải lên: 21/06/2014, 22:20

... compensateforthesluggish kinetics and insufficient density of plasma species during the LPLT synthesis. A new and effective way to control the crystal size, surface morphology, and growth mechanism of diamond films by regulating ... activity and diamond secondary nucleat ion [10-12]. The normal growth temperature and pressure of UNCD f ilms synthesized by mi crowave Ar- 1...

Ngày tải lên: 22/06/2014, 00:20

... diameter of ca. 5 nm). The further evidence of the existence of Ag nanoparticles is provided by EDS (Fig. 3e), which reveals the presence of S and Ag on the surface of SWCNT@SiO 2 /Ag. Similarly, by ... typical reaction, 0.4 mL of ammonia water (28 wt %), 6 lL of MPTO, and 0.1 mL of TEOS were orderly added to the reactor containing 10 mL of abso- lute ethanol and 5...

Ngày tải lên: 22/06/2014, 00:20

... synthesizing CdTe /CdS QDs [20]. As shown in Fig. 2a, with a flow rate of 1.5 L/min and temperature of 200, 225, and 250°C, CdTe /CdS/ ZnS core/ shell/shell QDs with PL peak of 525, 554, and 567 nm were ... shells on CdTe cores. A shell of CdS between CdTe and ZnS can work as a transition shell because the band gap and lattice contact of CdS is just between that o...

Ngày tải lên: 22/06/2014, 00:20

... spherical, monodisperse with a uniform size of 20 nm, and of cubic phase with good crystallinity. Furthermore, these nanoparticles have good dispersibility in nonpolar organic solvents and exhibit visible ... structure and morphology of NaYF 4 :20% Yb 3+ ,2% Er 3+ UCNPs were character ized by XRD and TEM. The obtained samples were characterized by XRD using a Brucker...

Ngày tải lên: 20/06/2014, 22:20

... Netherlands) with Cu Ka radiation (25 mA and 40 kV) at a scan rate of 2°/min with a step size of 0.02°. Nitrogen adsorption-desorpti on experiment was performedat77Kandatroomtemperaturewitha Micrometritics ... consist of well-dispersed particles without interfacial incompatibility and defects between the inorganic material and the polymer. Therefore, care- ful selection of a...

Ngày tải lên: 20/06/2014, 23:20

... c- tion of femtosecond laser pulse repetition rate. Fig ure 6 shows XRD pattern of NdFeB magnetic nanofibers gener- ated by femtosecond laser at 26 MHz and a power of 15 W. The average nanofibers ... nanofi- bers on the specimen using the same power and wave- length with frequencies of 8, 13, and 26 MHz. The irradiated sample was characterized using SEM, TEM, EDX, and XRD...

Ngày tải lên: 21/06/2014, 03:20

... formation of nanometer scale crystallites of HfO 2 .The second method involved a two-step heating process by which macroscopic, freestanding nanosheets of HfO 2 were formed as a byproduct during the synthesis ... supported by the Battelle foundation and the Iowa Office of Energy Independence grant #09-IPF-11. The Rigaku X-ray diffractometer and Bruker EDX systems were purcha...

Ngày tải lên: 21/06/2014, 04:20

... integration of CNT into appli- cations and large-scale production processes rema ins limited and is dependant on the understanding of several fundamental i ssues. Some of these issues are highlighted by the ... structure -property correla- tions. In addition, it highlighted the use of transition metals as catalysts for carbon nanotube synthesis. Over the next years, a massive...

Ngày tải lên: 21/06/2014, 04:20