Interaction of acetone with the Si(001) surface

Saraireh, Sherin A.; Smith, P. V.; Radny, Marian W.; Schofield, Steven R.; King, B.V.

doi:10.1016/j.susc.2008.08.027

Cited by 11 publications

(22 citation statements)

References 22 publications

(40 reference statements)

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“…The cyclic 1,2-disilaoxetane structure is attributed to the [2 + 2] cycloaddition of the aldehyde to silicon dimer pairs at the surface. The 1,2-disilaoxetane structure has been proposed for the reaction of acetone [41] and aldehydes [42] with clean silicon surfaces. Upon exposure to air, the cycloadduct product undergoes partial hydrolysis as shown in Scheme 2, which accounts for the surface-bound silanol and for the secondary alcohol which together contributes to the broad OH band observed in the FTIR spectrum.…”

Section: Resultsmentioning

confidence: 99%

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: 99%

Silicon nanoparticles with chemically tailored surfaces

Heintz

Fink

Mitchell

2009

Applied Organom Chemis

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“…In addition, the experimental focus should also guide the choice of pyrite pretreatment procedures. For example, acetone scavenges dangling bonds from Si(001) surfaces [ 37 ], and although its effects on pyrite surfaces have not been studied, the use of acetone and other organic solvents is not recommended when radical formation is desired, as in the study of the effects of pyrite on human health.…”

Section: Introductionmentioning

confidence: 99%

An improved pyrite pretreatment protocol for kinetic and isotopic studies

2014

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BackgroundPyrite is one of the most abundant and widespread of the sulfide minerals with a central role in biogeochemical cycles of iron and sulfur. Due to its diverse roles in the natural and anthropogenic sulfur cycle, pyrite has been extensively studied in various experimental investigations of the kinetics of its dissolution and oxidation, the isotopic fractionations associated with these reactions, the microbiological processes involved, and the effects of pyrite on human health. Elemental sulfur (S0) is a common product of incomplete pyrite oxidation. Preexisting S0 impurities as unaccounted reaction products are a source of experimental uncertainty, as are adhered fine grains of pyrite and its oxidation products. Removal of these impurities is, therefore, desirable.A robust standardized pretreatment protocol for removal of fine particles and oxidation impurities from pyrite is lacking. Here we describe a protocol for S0 and fine particle removal from the surface of pyrite by rinsing in acid followed by repeated ultrasonication with warm acetone.ResultsOur data demonstrate the presence of large fractions of S0 on untreated pyrite particle surfaces, of which only up to 60% was removed by a commonly used pretreatment method described by Moses et al. (GCA 51:1561-1571, 1987). In comparison, after pretreatment by the protocol proposed here, approximately 98% S0 removal efficiency was achieved. Additionally, the new procedure was more efficient at removal of fine particles of adhered pyrite and its oxidation products and did not appear to affect the particle size distribution, the specific surface area, or the properties of grain surfaces.ConclusionsThe suggested pyrite pretreatment protocol is more efficient in removal of impurities from pyrite grains, and provides multiple advantages for both kinetic and isotopic investigations of pyrite transformations under various environmental conditions.Graphical AbstractPyrite pretreatment by a commonly used technique (Method I) and a novel protocol (Method II)

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“…The covalent attachment of organic compounds onto semi-conductor surfaces to create molecular electronic devices with unique functionality has currently attracted particular inter-Vol.28 est. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] To construct such hybrid devices, full control over the deposition of organic adsorbates on semiconductor surfaces, particularly on Si(100) surface is required. 18 The diversity of organic functional groups can provide access to a large number of adjustable functions and properties.…”

Section: Introductionmentioning

confidence: 99%

“…For example, by attaching functional groups, such as COOH, NH2, OH, or CH3, different hydrophobic surfaces with adjustable contact properties with metals and electron conductivities could be obtained. In the past decade, the [2+2] C＝O cycloaddition reactions of carbonyl compounds with Si(100) surface have been studied extensively, and the theoretical and experimental investigations were mostly focused on acetone [2+2] C＝O clycloaddition on Ge(100) 3,19 and Si(100) [1][2][3]5,[10][11][12][19][20][21] surfaces, where the π components of C＝O double bonds reacted with semiconductor surfaces to form Si(Ge)-C and Si(Ge)-O σ-bonds. 9 Also of interest among the carbonyl compounds is aldehydes.…”

Section: Introductionmentioning

confidence: 99%

“…However, the significance of α-H cleavage on semiconductor cluster surfaces can not be obscured by the [2 + 2] C＝O clycloaddition of carbonyl compounds, and there are still many pioneering investigations on the ene reaction. [3][4][5]9,12,19,25,26 To control the surface chemical properties of carbonyl compounds for possible applications, it is essential to understand the chemical reactivity and selectivity on the surface. To our knowledge, although the [2 + 2] clycloaddition and α-H cleavage of acetone have been investigated extensively, there needs further study on the other carbonyl compounds to obtain the reaction character on the Si(100) cluster surface.…”

Section: Introductionmentioning

confidence: 99%

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Selectivity of [2+2] C＝O Cycloaddition and <em>α</em>-H Cleavage of Carbonyl Compounds on Si(100) Surface

张继超¹,

程学礼²,

程玉桥³

et al. 2012

Acta Physico-Chimica Sinica

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Recent studies have demonstrated that a simple ketone [acetone, (CH3)2C＝O)] reacts with the Si(100) surface in a [2+2] C＝O cycloaddition or by α-H cleavage to form Si-C and/or Si-O σ-bonds. To understand the reactivity of carbonyl compounds bearing different substitutes, the [2 + 2] C＝O cycloaddition and α-H cleavage of carbonyl compounds CH3COR (R=CH3, H, C2H5, C6H5) on Si(100) surface have been investigated using density functional theory at the B3LYP/6-311 ++ G(d,p)//6-31G(d) level. Our calculation results reveal that: (1) both cycloaddition and α-H cleavage corresponds to very low energy barriers (lower than 25 kJ•mol-1), and the energy barrier for cycloaddition is slightly higher than α-H cleavage; (2) the substituents on the carbonyl compound [CH3COR] has only a minor influence on the energy barrier; (3) the α-H cleavage reactions are thermodynamically and kinetically more favorable than cycloadditions; (4) for the α-H cleavage of butanone, reactions at C1 and C3 positions are competitive. These findings suggest that the reactions of ketone derivatives with Si(100) surface will generate multiple products.

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Interaction of acetone with the Si(001) surface

Cited by 11 publications

References 22 publications

Silicon nanoparticles with chemically tailored surfaces

Silicon nanoparticles with chemically tailored surfaces

An improved pyrite pretreatment protocol for kinetic and isotopic studies

Selectivity of [2+2] C＝O Cycloaddition and <em>α</em>-H Cleavage of Carbonyl Compounds on Si(100) Surface

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Interaction of acetone with the Si(001) surface

Cited by 11 publications

References 22 publications

Silicon nanoparticles with chemically tailored surfaces

Silicon nanoparticles with chemically tailored surfaces

An improved pyrite pretreatment protocol for kinetic and isotopic studies

Selectivity of [2+2] C＝O Cycloaddition and <em>&alpha;</em>-H Cleavage of Carbonyl Compounds on Si(100) Surface

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Selectivity of [2+2] C＝O Cycloaddition and <em>α</em>-H Cleavage of Carbonyl Compounds on Si(100) Surface