Oxidation Mechanism of Silicon Surface. In situ Counting of the Number of Oxidized Si Layers by the Reflectance-Difference Oscillation Technique.

Electron microscopy at 0.2nm point-to-point resolution, 10-10 torr specimei region vacuum and facilities for in-situ specimen cleaning presents intere; ing possibilities for surface structure determination. Three methods for examining the surfaces are available: reflection (REM), transmission (TEM) and profile imaging. Profile imaging is particularly useful because it giv good resolution perpendicular as well as parallel to the surface, and can therefore be used to determine the relationship between the surface and the bulk structure.

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Porous Silicon Structural Evolution from In-Situ Luminescence and Raman Measurements

MRS Proceedings ◽

10.1557/proc-431-171 ◽

1996 ◽

Vol 431 ◽

Author(s):

D. R. Tallant ◽

M. J. Kelly ◽

T. R. Guilinger ◽

R. L. Simpson

Keyword(s):

Porous Silicon ◽

Silicon Surface ◽

Structural Evolution ◽

Surface Oxidation ◽

Ethanol Solution ◽

Nonradiative Recombination ◽

Photoluminescence Intensity ◽

Exciton Migration ◽

Photoluminescence Mechanism

AbstractWe performed in-situ photoluminescence and Raman measurements on an anodized silicon surface in the HF/ethanol solution used for anodization. The porous silicon thereby produced, while resident in HF/ethanol, does not immediately exhibit intense photoluminescence. Intense photoluminescence develops spontaneously in HF/ethanol after 18–24 hours or with replacement of the HF/ethanol with water. These results support a quantum confinement mechanism in which exciton migration to traps and nonradiative recombination dominates the de-excitation pathways until silicon nanocrystals are physically separated and energetically decoupled by hydrofluoric acid etching or surface oxidation. The porous silicon surface, as produced by anodization, shows large differences in photoluminescence intensity and peak wavelength over millimeter distances. Parallel Raman measurements implicate nanometer-size silicon particles in the photoluminescence mechanism.

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In situ removal of a native oxide layer from an amorphous silicon surface with a UV laser for subsequent layer growth

CrystEngComm ◽

10.1039/c8ce01170b ◽

2018 ◽

Vol 20 (44) ◽

pp. 7170-7177 ◽

Cited By ~ 2

Author(s):

Christian Ehlers ◽

Stefan Kayser ◽

David Uebel ◽

Roman Bansen ◽

Toni Markurt ◽

...

Keyword(s):

Laser Pulse ◽

Amorphous Silicon ◽

Oxide Layer ◽

Silicon Surface ◽

Layer Growth ◽

Native Oxide ◽

Native Oxide Layer ◽

Uv Laser ◽

Subsequent Layer

An in situ method for selectively heating a substrate by a laser pulse was modelled and investigated experimentally.

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Direct UHV-TEM Observation of Palladium Clusters on a Silicon Surface

Microscopy and Microanalysis ◽

10.1017/s143192760404022x ◽

2004 ◽

Vol 10 (1) ◽

pp. 134-138 ◽

Cited By ~ 2

Author(s):

Masaki Takeguchi ◽

Kazutaka Mitsuishi ◽

Miyoko Tanaka ◽

Kazuo Furuya

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Surface Layer ◽

Silicon Surface ◽

Lattice Structure ◽

Plan View ◽

Palladium Clusters ◽

Transmission Electron ◽

Pd Clusters

About 1 monolayer of palladium was deposited onto a silicon (111) 7 × 7 surface at a temperature of about 550 K inside an ultrahigh vacuum transmission electron microscope, resulting in formation of Pd2Si nanoislands and a 1 × 1 surface layer. Pd clusters created from an excess of Pd atoms on the 1 × 1 surface layer were directly observed byin situplan view high-resolution transmission electron microscopy. When an objective aperture was introduced so that electron diffractions less than 0.20 nm were filtered out, the lattice structure of the 1 × 1 surface with 0.33 nm spacing and the Pd clusters with a trimer shape were visualized. It was found that image contrast of the 1 × 1 lattice on the specific height terraces disappeared, and thereby an atomic structure of the Pd clusters was clearly observed. The appearance and disappearance of the 1 × 1 lattice was explained by the effect of the kinematical diffraction. It was identified that a Pd cluster was composed of three Pd atoms without a centered Si atom, which is consistent with the model proposed previously. The feature of the Pd clusters stuck at the surface step was also described.

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Analysis of Interfacial Water at a Hydrophilic Silicon Surface by in-Situ FTIR/Internal Reflection Spectroscopy

Langmuir ◽

10.1021/la950340b ◽

1996 ◽

Vol 12 (17) ◽

pp. 4176-4184 ◽

Cited By ~ 49

Author(s):

M. R. Yalamanchili ◽

A. A. Atia ◽

J. D. Miller

Keyword(s):

Silicon Surface ◽

Internal Reflection ◽

Interfacial Water ◽

In Situ Ftir ◽

Reflection Spectroscopy ◽

Internal Reflection Spectroscopy

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In Situ Laser Light Scattering: II . Relationship to Silicon Surface Topography

Journal of The Electrochemical Society ◽

10.1149/1.2096406 ◽

1989 ◽

Vol 136 (10) ◽

pp. 3088-3094 ◽

Cited By ~ 18

Author(s):

A. J. Pidduck ◽

D. J. Robbins ◽

D. B. Gasson ◽

C. Pickering ◽

J. L. Glasper

Keyword(s):

Light Scattering ◽

Surface Topography ◽

Silicon Surface ◽

Laser Light ◽

Laser Light Scattering

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Chlorine for in-situ Low-Temperature Silicon Surface Cleaning for Epitaxy Applications

ECS Meeting Abstracts ◽

10.1149/ma2007-01/12/603 ◽

2007 ◽

Keyword(s):

Low Temperature ◽

Silicon Surface ◽

Surface Cleaning

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Rapid in situ cross-linking of hydrogel adhesives based on thiol-grafted bio-inspired catechol-conjugated chitosan

Journal of Biomaterials Applications ◽

10.1177/0885328217738403 ◽

2017 ◽

Vol 32 (5) ◽

pp. 612-621 ◽

Cited By ~ 6

Author(s):

Zhiwen Zeng ◽

Xiumei Mo

Keyword(s):

Soft Tissues ◽

Sodium Periodate ◽

Oxidation Mechanism ◽

Thiol Group ◽

In Vitro Cytotoxicity ◽

Tissue Adhesive ◽

Molar Ratio ◽

Adhesive Properties

In this paper, a novel chitosan derivative, thiol-grafting bio-inspired catechol-conjugated chitosan was synthesized. The chemical structure of the synthesized catechol-conjugated chitosan was verified by 1H NMR, and its contents of thiol group and catechol group were determined by UV-vis spectrum. Four percent of catechol-conjugated chitosan aqueous solution could form hydrogels rapidly in situ in 1 min or less with the addition of sodium periodate. Rheological studies showed that the mechanical properties depend on the concentrations of catechol-conjugated chitosan and the molar ratio of sodium periodate to catechol groups. Additionally, the adhesive properties of the resulting adhesives were evaluated, and the adhesion strength of obtained adhesives was as high as 50 kPa because of the complex and multiple interactions, especially the anti-oxidation mechanism of thiol group. The in vitro cytotoxicity assays demonstrated an excellent biocompatibility of the catechol-conjugated chitosan hydrogels. Benefiting from the in situ fast cured, desired mechanical strength, biocompatibility and relatively high adhesion performance, these properties suggested that catechol-conjugated chitosan hydrogel adhesives have potential applications as tissue adhesive for soft tissues.

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