Rôle for organic molecules in the oxidation of porous silicon

1997 ◽  
pp. 2275-2276 ◽  
Author(s):  
James E. Bateman ◽  
Robert D. Eagling ◽  
Benjamin R. Horrocks ◽  
Andrew Houlton ◽  
David R. Worrall
Keyword(s):  
Porous Silicon ◽  
Organic Molecules

Electrical porous silicon sensor for detection of various organic molecules in liquid phase

2015 ◽  
Vol 212 (8) ◽  
pp. 1851-1857 ◽  
Author(s):  
Farid A. Harraz ◽  
Adel A. Ismail ◽  
Houcine Bouzid ◽  
Saleh A. Al-Sayari ◽  
Ali Al-Hajry ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Porous Silicon ◽  
Organic Molecules ◽  
Silicon Sensor

Surface Self-Diffusion of Organic Molecules Adsorbed in Porous Silicon

2005 ◽  
Vol 109 (12) ◽  
pp. 5746-5752 ◽  
Author(s):  
Rustem Valiullin ◽  
Pavel Kortunov ◽  
Jörg Kärger ◽  
Viktor Timoshenko
Keyword(s):  
Porous Silicon ◽  
Organic Molecules ◽  
Self Diffusion

scholarly journals Desorption/ionization on silicon for small molecules:a promising alternative to MALDI TOF.

2003 ◽  
Vol 50 (3) ◽  
pp. 783-787 ◽  
Author(s):  
Agnieszka Kraj ◽  
Tomasz Dylag ◽  
Anna Gorecka-Drzazga ◽  
Sylwester Bargiel ◽  
Jan Dziubanand ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Small Molecules ◽  
Molecular Mass ◽  
Organic Molecules ◽  
Mass Region ◽  
Promising Alternative ◽  
Small Organic Molecules ◽  
Desorption Ionization ◽  
Maldi Tof ◽  
Detection And Identification

A method has been developed for laser desorption/ionization of catecholamines from porous silicon. This methodology is particularly attractive for analysis of small molecules. MALDI TOF mass spectrometry, although a very sensitive technique, utilizes matrices that need to be mixed with the sample prior to their analysis. Each matrix produces its own background, particularly in the low-molecular mass region. Therefore, detection and identification of molecules below 400 Da can be difficult. Desorption/ionization of samples deposited on porous silicon does not require addition of a matrix, thus, spectra in the low-molecular mass region can be clearly readable. Here, we describe a method for the analysis of catecholamines. While MALDI TOF is superior for proteomics/peptidomics, desorption/ionization from porous silicon can extend the operating range of a mass spectrometer for studies on metabolomics (small organic molecules and their metabolites, such as chemical neurotransmitters, prostaglandins, steroids, etc.).

Functionalization of Porous Silicon Surfaces by Solution-Phase Reactions with Alcohols and Grignard Reagents

1998 ◽  
Vol 536 ◽  
Author(s):  
N. Y. Kim ◽  
P. E. Laibinis
Keyword(s):  
Porous Silicon ◽  
Room Temperature ◽  
Organic Molecules ◽  
Solution Phase ◽  
Silicon Surfaces ◽  
Covalent Attachment ◽  
Grignard Reagents ◽  
X Ray ◽  
Reaction Proceeds ◽  
Support Evidence

AbstractThis paper describes the covalent attachment of various organic molecules to the hydrogenterminated surface of porous silicon using alcohols and Grignard reagents. With alcohols, the chemical reaction forms Si-O-C attachments to the silicon substrate and requires modest heating (40–70 °C). With Grignard reagents, the reaction proceeds at room temperature and forms a covalent film that is attached by Si-C bonds to the silicon support. Evidence for these reactions is provided by infrared and x-ray photoelectron spectroscopies.

Thermal Functionalization of Hydrogen-Terminated Porous Silicon Surfaces with Terminal Alkenes and Aldehydes

2000 ◽  
Vol 638 ◽  
Author(s):  
Rabah Boukherroub ◽  
David J. Lockwood ◽  
Danial D. M. Wayner ◽  
Leigh T. Canham
Keyword(s):  
Porous Silicon ◽  
Diffuse Reflectance ◽  
Organic Molecules ◽  
Silicon Surfaces ◽  
Organic Monolayers ◽  
Chemical Reagent ◽  
X Ray ◽  
Chemically Modified ◽  
Terminal Alkenes ◽  
Diffuse Reflectance Infrared

AbstractH-terminated porous silicon (PSi) surfaces were chemically modified with terminal alkenes and aldehydes at high temperature to yield organic monolayers covalently attached to the surface through Si-C and Si-O-C bonds, respectively. Diffuse reflectance infrared Fouriertransform and X-ray photoelectron spectroscopies have been used to characterize the surfaces. Derivatized surfaces retain the PSi photoluminescence. Chemography was used to monitor the chemical changes of the PSi surface when exposed to 100% humidity in air. Organic monolayers linked through Si-C bonds are found to be highly resistant and have shown a better protection of the surface against corrosion compared to surfaces that are linked through Si-O-C bonds. The surface functionalized with ethyl undecylenate exhibits an even higher passivation of the surface through the presence of small amounts of oxide, which are induced by traces of water present in this chemical reagent, along with organic molecules attached to the surface.

Doubly resonant porous silicon microcavities for enhanced detection of fluorescent organic molecules

2009 ◽  
Vol 137 (2) ◽  
pp. 467-470 ◽  
Author(s):  
Beniamino Sciacca ◽  
Francesca Frascella ◽  
Alberto Venturello ◽  
Paola Rivolo ◽  
Emiliano Descrovi ◽  
...  
Keyword(s):  
Porous Silicon ◽  
Organic Molecules

High Resolution Replication of Organoclay Surfaces

1982 ◽  
Vol 40 ◽  
pp. 576-577
Author(s):  
W. W. Barker ◽  
W. E. Rigsby ◽  
V. J. Hurst ◽  
W. J. Humphreys
Keyword(s):  
Clay Mineral ◽  
Organic Molecule ◽  
Organic Molecules ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Naturally Occurring ◽  
Silicate Layers ◽  
Mineral Identification

Experimental clay mineral-organic molecule complexes long have been known and some of them have been extensively studied by X-ray diffraction methods. The organic molecules are adsorbed onto the surfaces of the clay minerals, or intercalated between the silicate layers. Natural organo-clays also are widely recognized but generally have not been well characterized. Widely used techniques for clay mineral identification involve treatment of the sample with H2 O2 or other oxidant to destroy any associated organics. This generally simplifies and intensifies the XRD pattern of the clay residue, but helps little with the characterization of the original organoclay. Adequate techniques for the direct observation of synthetic and naturally occurring organoclays are yet to be developed.

Direct phase determination in electron crystallography: small organic molecules

1992 ◽  
Vol 50 (2) ◽  
pp. 1166-1167
Author(s):  
Douglas L. Dorset
Keyword(s):  
Organic Molecules ◽  
Data Sets ◽  
Temperature Structure ◽  
3D Analysis ◽  
Intensity Data ◽  
Electron Crystallography ◽  
Phase Determination ◽  
Measured Intensity ◽  
3D Data

The quantitative use of electron diffraction intensity data for the determination of crystal structures represents the pioneering achievement in the electron crystallography of organic molecules, an effort largely begun by B. K. Vainshtein and his co-workers. However, despite numerous representative structure analyses yielding results consistent with X-ray determination, this entire effort was viewed with considerable mistrust by many crystallographers. This was no doubt due to the rather high crystallographic R-factors reported for some structures and, more importantly, the failure to convince many skeptics that the measured intensity data were adequate for ab initio structure determinations.We have recently demonstrated the utility of these data sets for structure analyses by direct phase determination based on the probabilistic estimate of three- and four-phase structure invariant sums. Examples include the structure of diketopiperazine using Vainshtein's 3D data, a similar 3D analysis of the room temperature structure of thiourea, and a zonal determination of the urea structure, the latter also based on data collected by the Moscow group.

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