In this paper, we report a VO2@TiO2 core-shell
structure, in which the VO2 nanorod core exhibits a remarkable modulation ability for solar infrared light, and the TiO2 anatase shell exhibits significant photocatalytic degradation of organic dye. In addition, the TiO2 overcoating not only increased the luminous transmittance of VO2 based on an antireflection effect, but also modified the intrinsic colour of VO2 films from yellow to light blue. The TiO2 also enhanced the chemical stability of LGX818 molecular weight VO2 against oxidation. This is the first report of such a single nanoparticle structure with both thermochromic and photocatalytic properties that offer significant potential for creating a multifunctional smart coating.”
“A method has been proposed to study optical characteristics of GaN/Al(0.45)Ga(0.55)N bilayer on sapphire substrate at room temperature. Utilizing the incomplete absorption between 270 and 365 nm, absorption spectrum and extinction coefficient of wurtzite GaN both below and above
energy gap were determined. Energy gaps of GaN and Al(0.45)Ga(0.55)N were located at 3.4 and 4.62 eV, respectively, in the same spectrum. Right above absorption edge (354 nm), the extinction coefficient was 0.269. Average AZD0530 concentration total thickness calculated from transmission and reflection spectra was 1413 and 1407 nm, respectively, and thickness of GaN was calculated as
268.5 nm from the envelope of maximum reflection resulted from GaN/AlGaN https://www.selleckchem.com/products/stattic.html interface. By comparison of two spectra, it was deduced that reflection curve had much larger oscillation amplitude than transmission spectrum, thanks to the larger contrast of interference fringes V. Additional half-wave loss was deduced at air/GaN interface, which resulted in the reverse of interference extrema. (C) 2010 American Institute of Physics. [doi:10.1063/1.3483952]“
“Two novel stilbene derivatives bearing anthracene core based on 1,3,4-oxadiazole were efficiently synthesized and characterized by H-1-NMR, mass spectrometry and elemental analysis. The optical properties of the title compounds were investigated by UV-vis absorption and fluorescence emission spectra in different solvents. Chemical calculations were performed by density functional theory (DFT) at the (B3LYP)/6-31G* level. The results show the two compounds exhibit strong green fluorescence emission ranged from 489-493 nm, and the fluorescence quantum yield ranged from 0.78-0.92. Their HOMO and LUMO levels are (-5.44 eV, -2.25 eV) and (-5.45 eV, -2.28 eV), respectively. The influence of the solvent on the fluorescence intensities was also discussed.