synthesis and optical properties of colloidal tungsten oxide nanorods

... Synthesis and Optical Properties of Colloidal Tungsten Oxide Nanorods Kwangyeol Lee, Won Seok Seo, and Joon T. Park* National Research Laboratory, Department of Chemistry and School of Molecular ... preparation of soluble and highly crystalline tungsten oxide nanorods of varying sizes by a mild, solution-based colloidal approach. A stirred slurry of 0...

Ngày tải lên: 20/03/2014, 13:08

... effects of size and shape of Si-nc on the incorporation of group-III (B and Al), group-IV (C and Ge) and group-V (N and P) impurities. Single-doping has been investigated both in spherical and faceted-like ... found that the band-gap of the codoped Si-nc is reduced with respect to the gap of the pure ones showing the possibility of an impurity-based engineering of th...

Ngày tải lên: 16/03/2014, 15:15

... calcinations are in the range of 30–150 nm. The gas sensing properties of these powders in the form of thick film were investigated with and without platinum doping. Gas response of thick films sintered ... detection of toxic environmental pollutants, and for the prevention of hazardous gas leaks. Different oxide semiconductors such as SnO 2 ,WO 3 , ZnO, MoO 3 , TiO 2 ,In 2...

Ngày tải lên: 19/03/2014, 16:48

Ngày tải lên: 22/03/2014, 11:20

... VNU Journal of Science, Mathematics - Physics 25 (2009) 193-197 193 Synthesis and thermoelectric properties of La(Fe 1-x Si x ) 13 compounds (x = 0.12, 0.14 and 0.15) Do Thi Kim ... crystal structure and thermoelectric properties of La(Fe 1-x Si x ) 13 compounds were investigated by means of X-ray powder diffraction and electrical resistivity, thermopower and the...

Ngày tải lên: 28/03/2014, 13:20

... magnetometer. The nanorods were mainly composed of tungsten, iron and their oxides. The iron-rich phase in the nanorods exhibits soft ferromagnetic behaviors with zero coercivity and zero remanence and a ... Physica B 392 (2007) 154–158 Synthesis, structure and magnetic properties of iron-doped tungsten oxide nanorods P.Z. Si a,b,c,Ã , C.J. Choi b , E. Bru ¨ ck c , J...

Ngày tải lên: 20/03/2014, 13:08

... attentions [2,3]. Nanostructures of well-established gas sensing materials like tin oxide [4–6], zinc oxide [7], tungsten oxide [8–10], titanium oxide [11,12], and indium oxide [13,14] have shown higher ... as NO 2 ,O 3 ,H 2 ,H 2 S, andNH 3 [21]. In particular, tungsten oxide showed superior sensitivity and selectivity in detecting NO 2 gas [22,23].On the other hand, nan...

Ngày tải lên: 19/03/2014, 16:48

... excess and resulted in partial reduction of the oxide. Sample D could be composed of tungsten oxides, in which the oxidation state of tungsten ranges from +6 like in WO 3 with a small amount of WO x . 3.5. ... of the tungsten oxide thin film sample. Fig. 5a shows survey scans spectra recorded within a range of 0 and 1000 eV at a takeoff angle of 901. Fig. 5b shows W...

Ngày tải lên: 20/03/2014, 13:08

... Large-scale synthesis, characterization and photoluminescence properties of amorphous silica nanowires by thermal evaporation of silicon monoxide Sanjay K. Srivastava a, Ã , ... the metal particles, (ii) formation of liquid droplet of metal and Si/SiO x and (iii) the precipitation in the form of solid nanowires after super-saturation of liquid metal–Si/SiO x droplet at .....

Ngày tải lên: 16/03/2014, 15:18

... EMA models. 4. Optical properties of SiNWs and GeNWs In Section 5 of the present paper, we aim to point out the importance of the many-body effects on the optica l re- sponse of some of the studied ... in terms of the different geo- metrical structure of wires grown with different orientation. Finally the comparison of the optical spectra of SiNWs and GeNWs with diame...

Ngày tải lên: 16/03/2014, 15:33