Tunable luminescence of nanoporous silicon via electrochemical etching parameters

... Page of 10 (a) (b) (c) (e) (f) (d) Figure Schematic of fabrication process of obtaining TiO nanotubes with nanoporous layer on top and complete titania nanoporous (TNP) structure via two-step anodization: ... structure at the top surface of Ti via nano-imprint and successive anodization of Ti TiO2 nanoporous structures on Si substrates have also been reported by...

Ngày tải lên: 21/06/2014, 04:20

... characterization Chapter focuses on the procedure of fabrication of silicon- on-oxidized porous silicon waveguides Fabrication of silicon- on-oxidized porous silicon waveguides using our ion irradiation and ... motivation of our work is to investigate different schemes to fabricate different kinds of low loss silicon waveguides and c-bend waveguides u...

Ngày tải lên: 09/09/2015, 11:21

... Cross-sectional SEM analysis of the sample provided direct evidence to support a- SiNW growth via an SLS mechanism Fig 3a shows a low-magnification cross-sectional SEM image It is visible that a layer of a- SiNWs ... a large area Ž10 = 10 mm of 111 Si substrate after a h period of growth EDS analysis Žinset proved that the nanowires consist mainly of silicon...

Ngày tải lên: 16/03/2014, 15:05

Ngày tải lên: 19/03/2014, 16:48

... paths of secondary electrons and fluorescence photons at the absorption edges probed Information on the bulk of the film was provided by the TEY spectra at the Si K-edge and the FLY spectra at the ... aspects of the isochronal study as well as the acquisition of XANES data in the isothermal study KD participated in the acquisition and analysis of RBS da...

Ngày tải lên: 21/06/2014, 05:20

... characterization of the various anodization parameters for silicon wafers of dierent resistivities as well as the characterization of the reduced porous silicon formation rate for irradiated silicon ... together with the formation of porous silicon This thesis also aims to apply this micromachining method for the fabrication of various devices and structures for...

Ngày tải lên: 11/09/2015, 10:02

... reduced PSi formation rates show similar trends with irradiation Chapter Eects of ion irradiation on roughness of silicon surface After machining silicon structures and devices, one often needs ... 10 mA/cm2 , 30mA/cm2 , 50mA/cm2 , 70mA/cm2 and 83 mA/cm2 Trial (red): 10 mA/cm2 , 30mA/cm2 , 50mA/cm2 , 70mA/cm2 and 83 mA/cm2 Trial (green): 30mA/cm2 , 60mA/cm2 , 90mA/cm2 All l...

Ngày tải lên: 11/09/2015, 10:02

... darker layers are of lower porosity Fig 5 .3 shows the cross sections of successfully fabricated multilayer PSi structures With the knowledge of the PSi formation rates (Fig 3. 2) at dierent current ... (d): Ratio Rn/n Figure 5.8: (a): Variation of  the unirradiated result to that of The assumption that the refractive index remains unchanged with ion irradiation is 60...

Ngày tải lên: 11/09/2015, 10:02

... or with an optical ber [ 84] These kind of concave cavities are of interest in quantum information science, particularly in the fabrication of atom chips [49 , 84] or for small particles detections ... prevent irradiation induced-damage to the underlying silicon The uence was set at ¢ 10 14 ions/cm2 , which is high enough to greatly reduce the subsequent rate of PSi formation...

Ngày tải lên: 11/09/2015, 10:02

... Conclusion The technique and capability of two and three dimensionally micro machining silicon/ PSi using ion irradiation together with PSi formation is clearly presented in this thesis In addition, ... this machining technique of silicon using ion irradiation is Three dimensional and free standing silicon structures, thin silicon walls, thin silicon lms as well as s...

Ngày tải lên: 11/09/2015, 10:02

... thinning of wafers, and realizing thick porous layers and silicon- on-insulator (SOI) structures 2.1 FABRICATION OF POROUS SILICON One of the fascinating aspects of porous silicon is its simple and ... EXPERIMENTAL 30 2.1 Fabrication of Porous Silicon 30 2.1.1 Silicon electrode preparation 30 2.1.2 Cell Set Up 32 2.2 Chemical Etching of Silicon 34 2.3 Post...

Ngày tải lên: 05/10/2015, 19:03

... structures of RGO 14 2.3.2 Reduction of Graphene Oxide Reduction of GO to graphene can be carried out via a number of different approaches such as thermal[75], chemical[76] and electrochemical methods[ 77] ... Reduced Graphene Oxide As one can tell from the name, reduced graphene oxide (RGO) is the product from the reduction of graphene oxide (GO) Red...

Ngày tải lên: 07/10/2015, 10:10

... used to analyse and evaluate the performance of a planar and a tubular-shaped PEM fuel cell 2.1 Computational domain The full computational domains for the planar and tubular-shaped PEM fuel cell ... conditions are specified at all external boundaries of the computational domain as well as boundaries for various mass and scalar equations inside the computationa...

Ngày tải lên: 05/09/2013, 14:58

... activation was Src- and Shc-dependent and resulted in enhanced expression of the uPA gene and, to a lesser extent, of the MMP-9 gene (data not shown) Disruption of cell–cell adhesion by calcium chelation ... leading to the uPA gene However, the nature of these signaling events has remained largely unknown Because both disruption of E-cadherin- depen...

Ngày tải lên: 19/02/2014, 05:20

... that the PX domain of p47phox binds intramolecularly to the SH3 domain in the same protein, and that this intramolecular interaction suppresses the lipid-binding activity of the PX domain in the ... 5579 fad49 plays a crucial role in adipogenesis T Hishida et al Fig Characterization of the PX domain of FAD49 (A) Phosphoinositide binding specificity of the...

Ngày tải lên: 16/03/2014, 04:20