An FTIR study of porous silicon layers exposed to humid air with and without pyridine vapors at room temperature

Mattei, Giorgio; Valentini, Veronica; Yakovlev, V.A.

doi:10.1016/s0039-6028(01)01898-2

Cited by 27 publications

(18 citation statements)

References 13 publications

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“…The high pH and nucleophilic nature of ammonia enhance oxidation of freshly etched porous Si in aqueous solutions [122]. Similar oxidation can be induced by vapor phase pyridine [123]. Nucleophilic groups present on drug payloads may also participate in this reaction [20], as can oxidizing species such as quinones [72].…”

Section: Trapping a Payload By Oxidationmentioning

confidence: 98%

Porous silicon in drug delivery devices and materials☆

Anglin

Cheng

Freeman

et al. 2008

Advanced Drug Delivery Reviews

808

618

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Porous Si exhibits a number of properties that make it an attractive material for controlled drug delivery applications: The electrochemical synthesis allows construction of tailored pore sizes and volumes that are controllable from the scale of microns to nanometers; a number of convenient chemistries exist for the modification of porous Si surfaces that can be used to control the amount, identity, and in vivo release rate of drug payloads and the resorption rate of the porous host matrix; the material can be used as a template for organic and biopolymers, to prepare composites with a designed nanostructure; and finally, the optical properties of photonic structures prepared from this material provide a self-reporting feature that can be monitored in vivo. This paper reviews the preparation, chemistry, and properties of electrochemically prepared porous Si or SiO 2 hosts relevant to drug delivery applications.

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Section: Trapping a Payload By Oxidationmentioning

confidence: 98%

Porous silicon in drug delivery devices and materials☆

Anglin

Cheng

Freeman

et al. 2008

Advanced Drug Delivery Reviews

808

618

View full text Add to dashboard Cite

show abstract

“…Notice, however, that on porous Si, pyridine can catalyze the reaction of water to form silica. [72] This could justify the presence of silica in the three series of samples, probably induced by residual traces of water. The minimum amount of silica found for the CEG sample is consistent with the cathodic conditions applied, which renders it less susceptible to nucleophilic attack in water.…”

Section: Discussionmentioning

confidence: 86%

Cathodic Electrografting of Versatile Ligands on Si(100) as a Low‐Impact Approach for Establishing a SiC Bond: A Surface‐Coordination Study of Substituted 2,2′‐Bipyridines with Cu^I Ions

Aurora

Cattaruzza

Coluzza

et al. 2007

Chemistry A European J

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Three distinct wet chemistry recipes were applied to hydrogen-terminated n- and p-Si(100) surfaces in a comparative study of the covalent grafting of two differently substituted 2,2'-bipyridines. The applied reactions require the use of heat, or visible light under a controlled atmosphere, or a suitable potential in an electrochemical cell. In this last case, hydrogen-terminated silicon is the working electrode in a cathodic electrografting (CEG) reaction, in which it is kept under reduction conditions. The resulting Si--C bound hybrids were characterized by a combination of AFM, dynamic contact-angle, and XPS analysis, with the help of theoretical calculations. The three distinct approaches were found to be suitable for obtaining ligand-functionalized Si surfaces. CEG resulted in the most satisfactory anchoring procedure, because of its better correlation between high coverage and preservation of the Si surface from both oxidation and contamination. The corresponding Si-bipyridine hybrid was reacted in a solution of CH3CN containing CuI ions coordinatively bound to the anchored ligands, as evidenced from the XPS binding-energy shift of the N atom donor functions. The reaction gave a 1:2 Cu-bipyridine surface complex, in which two ligands couple to a single CuI ion. The surface complex was characterized by the Cu Auger parameter and Cu/N XPS atomic-ratio values coincident with those for pure, unsupported CuI complex with the same 2,2'-bipyridine. Further support for such a specific metal-ligand interaction at the functionalized Si surface came from the distinct values of Cu2p binding energy and the Cu Auger parameter, which were obtained for the species resulting from CuI ion uptake on hydrogen-terminated Si(100).

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“…For long hydrogen exposure times in both deposits prepared by PLA a bending d(OH) peak of adsorbed water at 1630 cm À1 is distinguishable. The released water determines other reactions [53][54][55][56]. Silanol absorption peak of (O 2 )SiH(OH) configuration found at 3735.8 cm À1 (calculated value 3736 cm À1 ) is the proof of the silylen [3]:…”

Section: Discussionmentioning

confidence: 99%

Characterization of deposits produced by TEA CO2 pulsed laser ablation of silicon mono- and dioxide

Dřı́nek

Vacek

Pola

et al. 2005

Journal of Non-Crystalline Solids

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An FTIR study of porous silicon layers exposed to humid air with and without pyridine vapors at room temperature

Cited by 27 publications

References 13 publications

Porous silicon in drug delivery devices and materials☆

Porous silicon in drug delivery devices and materials☆

Cathodic Electrografting of Versatile Ligands on Si(100) as a Low‐Impact Approach for Establishing a SiC Bond: A Surface‐Coordination Study of Substituted 2,2′‐Bipyridines with Cu^I Ions

Characterization of deposits produced by TEA CO2 pulsed laser ablation of silicon mono- and dioxide

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An FTIR study of porous silicon layers exposed to humid air with and without pyridine vapors at room temperature

Cited by 27 publications

References 13 publications

Porous silicon in drug delivery devices and materials☆

Porous silicon in drug delivery devices and materials☆

Cathodic Electrografting of Versatile Ligands on Si(100) as a Low‐Impact Approach for Establishing a SiC Bond: A Surface‐Coordination Study of Substituted 2,2′‐Bipyridines with CuI Ions

Characterization of deposits produced by TEA CO2 pulsed laser ablation of silicon mono- and dioxide

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Product

Resources

About

Cathodic Electrografting of Versatile Ligands on Si(100) as a Low‐Impact Approach for Establishing a SiC Bond: A Surface‐Coordination Study of Substituted 2,2′‐Bipyridines with Cu^I Ions