Photopatterned Hydrosilylation on Porous Silicon

Stewart, Michael; Buriak, Jillian M.

doi:10.1002/(sici)1521-3773(19981217)37:23<3257::aid-anie3257>3.0.co;2-1

Cited by 243 publications

(206 citation statements)

References 16 publications

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“…Recently, chemical pathways for direct functionalization of silicon substrates without an oxide layer has opened up new possibilities for highly controlled DNA attachment. These new attachment methods provide modified silicon surfaces through direct carbon-silicon bonds (19,(36)(37)(38)(39)(40)(41), and have resulted in methyl, chlorine, ester, or acid terminated substrates (36,39,40,42,43). Although Wagner used a N-hydroxysuccinimidyl ester terminated silicon surface to immobilize a 1752 bp double-stranded section of DNA (19), little other work of this nature has been reported.…”

Section: Introductionsupporting

confidence: 80%

Covalent attachment of oligodeoxyribonucleotides to amine-modified Si (001) surfaces

Strother

Hamers

Smith

2000

Nucleic Acids Research

279

308

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A recently described reaction for the UV-mediated attachment of alkenes to silicon surfaces is utilized as the basis for the preparation of functionalized silicon surfaces. UV light mediates the reaction of tbutyloxycarbonyl (t-BOC) protected ω-unsaturated aminoalkane (10-aminodec-1-ene) with hydrogenterminated silicon (001). Removal of the t-BOC protecting group yields an aminodecane-modified silicon surface. The resultant amino groups can be coupled to thiol-modified oligodeoxyribonucleotides using a heterobifunctional crosslinker, permitting the preparation of DNA arrays. Two methods for controlling the surface density of oligodeoxyribonucleotides were explored: in the first, binary mixtures of 10-aminodec-1-ene and dodecene were utilized in the initial UV-mediated coupling reaction; a linear relationship was found between the mole fraction of aminodecene and the density of DNA hybridization sites. In the second, only a portion of the t-BOC protecting groups was removed from the surface by limiting the time allowed for the deprotection reaction. The oligodeoxyribonucleotide-modified surfaces were extremely stable and performed well in DNA hybridization assays. These surfaces provide an alternative to gold or glass for surface immobilization of oligonucleotides in DNA arrays as well as a route for the coupling of nucleic acid biomolecular recognition elements to semiconductor materials.

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Section: Introductionsupporting

confidence: 80%

Covalent attachment of oligodeoxyribonucleotides to amine-modified Si (001) surfaces

Strother

Hamers

Smith

2000

Nucleic Acids Research

279

308

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“…[60,[82][83][84][85][86][87][88] Hydrosilylation involves reaction of an alkene (usually terminal) or alkyne with a Si-H bond. On porous Si, the reaction can be thermal [85], photochemical [89,90], or Lewis acid catalyzed [80,81]. (5) Thermal hydrosilylation provides a means to place a wide variety of organic functional groups on a crystalline Si or porous Si surface [80].…”

Section: Hydrosilylation To Produce Si-c Bondsmentioning

confidence: 96%

“…Finally, the ease with which porous Si can be integrated into well-established Si microelectronics fabrication techniques could also lead to more sophisticated, active devices for medical applications [65,89,198]. The possibility of placing active electronic circuit components into the silicon-based particles is another feature of silicon that is yet to be exploited for in vivo use.…”

Section: Summary and Prospectsmentioning

confidence: 99%

Porous silicon in drug delivery devices and materials☆

Anglin

Cheng

Freeman

et al. 2008

Advanced Drug Delivery Reviews

801

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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“…6,7,11,12,24 One approach to prevent oxide formation is to chemically passivate the Si microwire surface through surface functionalization reactions that exploit the kinetic stability of the Si-C bond. [25][26][27] Alkylation of H-terminated Si using alkylmagnesium reagents; 28,29 46 In some cases, such surface functionalization has been shown to produce enhanced oxidative stability and to result in a low surface recombination velocity.…”

mentioning

confidence: 99%

Comparison between the electrical junction properties of H-terminated and methyl-terminated individual Si microwire/polymer assemblies for photoelectrochemical fuel production

Yahyaie

Ardo

Oliver

et al. 2012

Energy Environ. Sci.

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The photoelectrical properties and stability of individual p-silicon (Si) microwire/ polyethylenedioxythiophene/polystyrene sulfonate:Nafion/n-Si microwire structures, designed for use as arrays for solar fuel production, were investigated for both H-terminated and CH 3 -terminated Si microwires. Using a tungsten probe method, the resistances of individual wires, as well as between individual wires and the conducting polymer, were measured vs. time. For the H-terminated samples, the n-Si/polymer contacts were initially rectifying, whereas p-Si microwire/polymer contacts were initially ohmic, but the resistance of both the n-Si and p-Si microwire/polymer contacts increased over time. In contrast, relatively stable, ohmic behavior was observed at the junctions between CH 3 -terminated p-Si microwires and conducting polymers. CH 3 -terminated n-Si microwire/polymer junctions demonstrated strongly rectifying behavior, attributable to the work function mismatch between the Si and polymer. Hence, a balance must be found between the improved stability of the junction electrical properties achieved by passivation, and the detrimental impact on the effective resistance associated with the additional rectification at CH 3 -terminated n-Si microwire/polymer junctions. Nevertheless, the current system under study would produce a resistance drop of $20 mV during operation under 100 mW cm À2 of Air Mass 1.5 illumination with high quantum yields for photocurrent production in a water-splitting device. Broader contextPhotoelectrosynthetic splitting of water to store solar energy in the simplest chemical bond, H-H, would provide a globally scalable means of compensating for the intermittency of solar energy at a given region of the earth's surface. A working device will require: a light harvesting component; redox catalysts; and a membrane barrier, for separating the products of the oxidation and reduction reactions, while maintaining efficient ionic conductivity to maintain charge neutrality. Given the useable solar energy range and the energy requirements for both oxidation and reduction reactions, it is challenging to find a single light absorber that can function efficiently. As in the natural photosynthetic system, it is possible to combine two light absorbers across a product-separating, ionically conductive membrane; however, the membrane is then required to manage, with minimal resistance, electron transport between the two light absorbers. We report herein the photoelectrical properties of a test structure of this type of device, incorporating an individual semiconductor photoanode and photocathode (with no redox catalysts) embedded into a candidate conducting polymer membrane, to form a single functional unit.

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Photopatterned Hydrosilylation on Porous Silicon

Cited by 243 publications

References 16 publications

Covalent attachment of oligodeoxyribonucleotides to amine-modified Si (001) surfaces

Covalent attachment of oligodeoxyribonucleotides to amine-modified Si (001) surfaces

Porous silicon in drug delivery devices and materials☆

Comparison between the electrical junction properties of H-terminated and methyl-terminated individual Si microwire/polymer assemblies for photoelectrochemical fuel production

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