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

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

scholarly journals Three-dimensional pulsed field gradient NMR measurements of self-diffusion in anisotropic materials for energy storage applications

2019 ◽  
Vol 21 (8) ◽  
pp. 4538-4546 ◽  
Author(s):  
S. Engelke ◽  
L. E. Marbella ◽  
N. M. Trease ◽  
M. De Volder ◽  
C. P. Grey
Keyword(s):  
Energy Storage ◽  
Porous Silicon ◽  
Field Gradient ◽  
Three Dimensional ◽  
Pulsed Field ◽  
Self Diffusion ◽  
Silicon Structures ◽  
Energy Storage Applications ◽  
Nmr Methods ◽  
Pfg Nmr

The ability to resolve solvent in- and outside of the pores of mesoscopic porous silicon structures allows the effect of confinement on transport to be explored by 1H and 7Li PFG NMR methods and pore diameters and lengths to be estimated.

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.

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
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