Water reaction with chlorine-terminated silicon (111) and (100) surfaces

Rivillon, Sandrine; Brewer, R. T.; Chabal, Yves J.

doi:10.1063/1.2119426

Cited by 23 publications

(33 citation statements)

References 21 publications

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“…Surface-bound Si-H groups, however, are highly susceptible to air oxidation and are readily converted to a surface-bound silanol (Si-O-H). [38,39] A strong peak can be observed at 1090 cm −1 in the Si-O region and is ascribed to the strong Si-O-C linkage that is formed at the surface. An O-H band over the 3200-3500 cm −1 range shows the involvement of a silanol group from the insertion of oxygen into a Si-H bond upon air oxidation (Scheme 1).…”

Section: Resultsmentioning

confidence: 97%

Silicon nanoparticles with chemically tailored surfaces

Heintz

Fink

Mitchell

2009

Applied Organom Chemis

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Silicon nanoparticles are useful materials for optoelectronic devices, solar cells and biological markers. The synthesis of air-stable nanoparticles with tunable optoelectronic properties is highly desirable. The mechanochemical synthesis of silicon nanoparticles via high-energy ball milling produces a variety of covalently bonded surfaces depending on the nature of the organic liquid used in the milling process. The use of the C 8 reactants including octanoic acid, 1-octanol, 1-octaldehyde and 1-octene results in passivated surfaces characterized by strong Si-C bonds or strong Si-O bonds. The surfaces of the nanoparticles were characterized by infrared spectroscopy and nuclear magnetic resonance spectroscopy. The nanoparticles were soluble in common organic solvents and remarkably stable against agglomeration and air oxidation. The luminescence and optical properties of the nanoparticles were very sensitive to the nature of their passivating surface.

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Section: Resultsmentioning

confidence: 97%

Silicon nanoparticles with chemically tailored surfaces

Heintz

Fink

Mitchell

2009

Applied Organom Chemis

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“…First, hydrogen-terminated Si(111) surfaces can be functionalized via a wet-chemical technique up to ∼30% of a monolayer with direct Si-O linkages without the formation of any detectable SiO 2 (Figures 2b and 3). This is important because high-temperature gas phase reactions of O 2 on H-Si(111) surfaces or of H 2 O deposition, and subsequent annealing of, reconstructed Si(100) surfaces demonstrate a high preference of subsurface Si-Si back-bonds to oxidize 84 via an oxygen insertion mechanism. 76,85,86 Thus, there is concern that atop Si-O linkages will be unstable toward decomposition via oxygen diffusion into the back bonds and result in electrically defective subsurface oxidation.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the Chemical Purity of Silicon Surfaces Reacted with Liquid Methanol

et al. 2008

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The reaction of hydrogen-terminated Si(111) and oxide-terminated silicon surfaces with neat anhydrous liquid methanol (CH 3 OH) has been studied with Fourier transform infrared spectroscopy (FTIR) as a function of solution temperature and immersion time. At 65°C, reaction of atomically smooth H-Si(111) surfaces with CH 3 OH (l) results in partially methoxylated silicon surfaces that are free of any detectable subsurface oxidation (Si-O-Si bonds); this is in contrast to observable oxidation found after similar reactions on H-Si(100) surfaces. At long reaction times (t > 3 h), the Si(111) surface saturates with Si-OCH 3 sites at a coverage of approximately 30% of a monolayer, with the residual ∼70% comprised of unreacted Si-H sites. The lack of any detectable silicon oxide makes it possible to conclude the following: (i) Reaction mechanisms involving insertion of oxygen atoms from the CH 3 OH molecule into the subsurface Si-Si back bonds cannot be dominant for (111)-oriented silicon under these conditions. (ii) The vibrational modes of the oxide-free surface are very sharp and can be clearly distinguished from blue-shifted modes observed for methoxyl groups chemisorbed on oxidized surfaces. For surfaces that display subsurface oxidation, no evidence for oxygen atoms directly below atop Si-H sites has been observed. Instead, FTIR analysis demonstrates that subsurface oxidation selectively exists underneath atop Si-OCH 3 sites. Finally, H-terminated oxide surfaces, prepared by reacting trichlorosilanes on OH-terminated SiO 2 surfaces, react with methanol to form a methoxy-terminated oxide surface.

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“…The damage to the -Br surfaces is expected given the susceptibility of these monolayers to strongly oxidative conditions, as reported previously. 59,60 -CH 3 terminated surfaces after 30 and 50 W oxygen plasma exposure show measured CA as $57 and $48 , respectively. After 30 and 50 W oxygen plasma the CA of the -CH 3 terminated surface did not approach values for clean glass surfaces.…”

Section: Bi Oxidative Plasma Exposuresmentioning

confidence: 99%

Characterizing stability of “click” modified glass surfaces to common microfabrication conditions and aqueous electrolyte solutions

Prakash

Karacor

2011

Nanoscale

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Microfluidic and nanofluidic systems are dominated by fluid-wall interactions due to enormous surface-area-to-volume ratios in these devices. Therefore, strategies to control wall properties in a reliable and repeatable manner can be important for device operation. Chemical modification of surfaces provides one such method. However, the stability of the surface adhered layers under fabrication and likely device operating conditions have not been evaluated in depth. This paper presents the stability analysis of three surface layers used in the 'click' chemistry methodology for surface modification. The three surface layers have bromo, amine, and methyl termination on glass surfaces. All three surface groups are exposed to various wet and dry conditions including acid, base, solvent, electrolyte buffer solutions, oxidative plasmas, UV light, and thermal processing conditions. Contact angle measurements, X-ray photoelectron spectroscopy, and atomic force microscopy were used to quantify the stability of the adhered surface layers. The data show that the brominated surface was stable to most test conditions, while both the amine and methyl surface layers were stable to a narrower set of test conditions.

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Water reaction with chlorine-terminated silicon (111) and (100) surfaces

Cited by 23 publications

References 21 publications

Silicon nanoparticles with chemically tailored surfaces

Silicon nanoparticles with chemically tailored surfaces

Investigation of the Chemical Purity of Silicon Surfaces Reacted with Liquid Methanol

Characterizing stability of “click” modified glass surfaces to common microfabrication conditions and aqueous electrolyte solutions

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