Báo cáo hóa học: " Temperature dependent optical properties of single, hierarchically self-assembled GaAs/AlGaAs quantum dots" potx

... 1:172–176 DOI 10.1007/s11671-006-9019-3 123 ORIGINAL PAPER Temperature dependent optical properties of single, hierarchically self-assembled GaAs/AlGaAs quantum dots M. Benyoucef Æ A. Rastelli Æ O. G. Schmidt ... the temperature dependence of the homogeneous line- width in QDs is still under debate. At low temperature, Fig. 2 Temperature dependence of PL energy p...

Ngày tải lên: 22/06/2014, 22:20

... collapse of the dot structures were caused by the high mobility of In atoms at this temperature [11–14]. Surface Structure Transition at 300°C Under As 4 and In Irradiations To prevent the collapse of ... substrate temperature was decreased from 500°Cto that of described in each observation. In the observation at 430°C, it was decreased from 500 to 430°C under As 4 irradiation. Wh...

Ngày tải lên: 21/06/2014, 08:20

... the growth angle effect of the films for optical properties. The thickness of the ZnO thin films was c heck ed by FE- SEM and was fixed at 100 nm. Three growth angles (0°, 15°, and 30°) of the columnar ... angle reflectances tended to increase compared with that of the 15° angle reflectance. Conclusions We investigated the optical properties of antireflection coating on colum...

Ngày tải lên: 21/06/2014, 17:20

... 3.5 0.0 5.0x10 4 1.0x10 5 1.5x10 5 2.0x10 5 2.5x10 5 3.0x10 5 α (cm -1 ) hv (eV) (a) (b) Fig. 4 Optical properties of SnS nanowires: a is the optical absorption spectrum and b is the dependence of absorption coefficient on photon energy 1.0 1.5 ... its semiconducting and optical properties. SnS, as one of the important IV–VI group semiconductors, exhibits both the p- and n-type...

Ngày tải lên: 22/06/2014, 01:20

... 7:26 http://www.nanoscalereslett.com/content/7/1/26 Page 4 of 7 temperatures on the structural properties of the films has been investigated, and the optical properties of the films have also been analyzed. Methods Synthesis ZnS ... ion of the sputtered atoms, thus form- ing a denser film with larger grains and lower defects. Optical properties The optical transmittance sp...

Ngày tải lên: 20/06/2014, 21:20

... magnetic properties. Magnetization curves as a function of applied magnetic field (M-H)at RT of samples are revealed in Figure 6, where the con- tributions of the paramagnetism (PM) signals of the samples ... curves at the dc field of 100 Oe in the tem- perature range of 10 to 300 K are measured on these samples, it’s given the typical one of Zn 0.995 Zr 0.005 O NPs bec ause o...

Ngày tải lên: 20/06/2014, 22:20

... Daniela Predoi 1* Abstract Synthesis of nanosized particle of Ag-doped hydroxyapatite with anti bacterial properties is in the great interest in the development of new biomedical applications. In ... results of XRD and TEM, the FTIR and FT-Raman spectra of the HAp show the absorption bands characteristic of hydroxyapatite. XPS results provide the additional evidence for the succ...

Ngày tải lên: 20/06/2014, 23:20

... over pore sidewall surface of InP template, which was different from that of ceramic template and may open up new branch of fabrication of nanocomposites. The mag netism of such Co/InP nanocomposites ... (Ministry of Education), Department of Physics, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China Full list of author information is available at t...

Ngày tải lên: 21/06/2014, 04:20

... moment of 2 μ B per chromium atom, which is inde- pendent of the number of monolayers. As the FM rutile- CrO 2 is unstable at ambient temperature, and known to be stabilized when on top of SnO 2 ,itissuggestedthat (CrO 2 ) n (SnO 2 ) n SLs ... 6:146 http://www.nanoscalereslett.com/content/6/1/146 Page 3 of 5 ground state, the total magnetic moment gives a value of 2 μ B per chrom...

Ngày tải lên: 21/06/2014, 05:20

... electronic structures of BNNTs. Fig- ure 7a,b,c,d,e shows the PDOS of s and p orbitals of B68 and N35 atoms as well as the summation of these orbitals for the (8,0) BNNT. At strain of 0, there is no contribution ... armchair BNNTs. Although the stress-strain profiles indicate the mechanical properties of these two BNNTs are very similar, the variations of electronic propertie...

Ngày tải lên: 21/06/2014, 05:20