Preferential Formation of SiOC over SiC Linkage upon Thermal Grafting on Hydrogen‐Terminated Silicon (111)

Khung, Yit Lung; Ngalim, Siti Hawa; Meda, L.; Narducci, Dario

doi:10.1002/chem.201403014

Cited by 42 publications

(42 citation statements)

References 49 publications

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“…As shown in Figure 2, the Si2p assignment for Si2p 3/2 and Si2p 1/2 at the nominal position of 99-100 eV was found to exhibit relatively different FWHM values with the p-type silicon, showing broader dual peaks (FWHM = 2.3 nm) (Figure 2a) compared to the n-type silicon (FWHM = 0.9 nm) (Figure 2b). On the other hand, both spectra showed the emergence of the peak at 102.2-102.5 eV, representative of the Si-O-C linkage to the surface [17,21,22]. The differences of peak profile and the changes in the FWHM of the Si2p could be attributed to the distribution of chemically shifted Si2p lines arising from surface roughening as reported previously in literature [23,24].…”

Section: Resultssupporting

confidence: 80%

“…Hence, we suspect that we could disregard all Hall effects at this temperature. Between both the n-and p-type substrate, the initial mechanism for the formation of Si-O-C bonds on the Si-H surface was relatively similar, occurring via the abstraction of hydrogen in the nucleophilic route [17,18] with the liberation of hydrogen during the process. However, from the start, the XPS Si2p spectrum on both the n-type silicon (111) and p-type silicon (111) showed the formation of Si-O-C bonding but their overall profiles were starkly different.…”

Section: Resultsmentioning

confidence: 99%

“…Previously, our group has also demonstrated the preference of hydrogenated silicon towards nucleophilic additions with alcohol ends of alkynes [6,17,18]. In fact, many reports have shown the susceptibility of alcohol grafting on silicon-hydride surfaces [4,7].…”

Section: Introductionmentioning

confidence: 92%

“…In a setup similar to our previous reports [6,17,18], all silicon wafers were cut into pieces (approximately 20 × 20 mm 2 ) and cleaned for 30 min in hot Piranha solution (95 • C, 1 vol 33% aqueous hydrogen peroxide to 3 vol 95-97% sulfuric acid). The surface was then transferred to an aqueous 2.5% hydrofluoric acid (HF) for a duration of 30 s to gently remove the native silicon oxide.…”

Section: Thermal Reaction Protocolmentioning

confidence: 99%

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Influences of Doping and Crystal Orientation on Surface Roughening upon Alcohol Grafting onto Silicon Hydride

Tung

Khung

2017

Applied Sciences

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An alcohol bearing alkyne was thermally grafted to both p-type and n-type silicon (111) and (100) substrate of comparable doping levels and surface flatness. The surface topography as well as the surface chemistry was examined via atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and water contact angle measurements. P-type silicon (111) was observed to experience roughening on the surface upon functionalization while n-type silicon (111) surfaces remained relatively unchanged. When the alcohol was grafted onto silicon (100) surface, the roughening effect was found to be even more profound for the p-type while the effects were marginal for the n-type surfaces. Both roughening effects were attributed to the differential weakening of the Si-Si backbond induced by majority carriers in p-and n-type silicon while (111) was observed to be able to resist the roughening effect better and this was explained by the notion of its denser adatom surface packing as well as the presence of surface defects.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Thermal Reaction Protocolmentioning

confidence: 99%

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Influences of Doping and Crystal Orientation on Surface Roughening upon Alcohol Grafting onto Silicon Hydride

Tung

Khung

2017

Applied Sciences

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“…[1][2] The reactivity of hydrogen-terminated Si(111) (H-Si(111)) surfaces toward organic nucleophiles, including alkenes, [3][4] alkynes, [5][6] amines, [7][8][9][10][11] thiols and disulfides, [12][13] Grignards, [14][15] and alcohols, [16][17][18][19][20][21][22][23][24][25] has been widely exploited to impart desirable functionality to the Si interface. These surface reactions have been used to control the interface between Si and metals, [26][27][28][29][30][31] metal oxides, [32][33][34][35] polymers, [36][37][38][39][40][41] and redox assemblies.…”

Section: Introductionmentioning

confidence: 99%

A Mechanistic Study of the Oxidative Reaction of Hydrogen-Terminated Si(111) Surfaces with Liquid Methanol

et al. 2017

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H-Si(111) surfaces have been reacted with liquid methanol (CH 3 OH) in the absence or presence of a series of oxidants and/or illumination. Oxidant-activated methoxylation of HSi(111) surfaces was observed in the dark after exposure to CH 3 OH solutions that contained the one-electron oxidants acetylferrocenium, ferrocenium, or 1,1'-dimethylferrocenium. The oxidant-activated reactivity toward CH 3 OH of intrinsic and n-type H-Si(111) surfaces increased upon exposure to ambient light. The results suggest that oxidant-activated methoxylation requires that two conditions be met: (1) the position of the quasi-Fermi levels must energetically favor oxidation of the H-Si(111) surface and (2) the position of the quasi-Fermi levels must energetically favor reduction of an oxidant in solution. Consistently, illuminated n-type HSi(111) surfaces underwent methoxylation under applied external bias more rapidly and at more negative potentials than p-type H-Si(111) surfaces. The results under potentiostatic control indicate that only conditions that favor oxidation of the H-Si(111) surface need be met, with charge balance at the surface maintained by current flow at the back of the electrode. The results are described by a mechanistic framework that analyzes the positions of the quasi-Fermi levels relative to the energy levels relevant for each system.

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Enhancement of physical and mechanical properties of polyamide 66 fibers using polysiloxane‐functionalized multi‐walled carbon nanotubes

Zhang

et al. 2020

J of Applied Polymer Sci

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A polyamide 66/3-aminopropyl-terminated poly(dimethylsiloxane) (PA66/ APDMS)-carboxylate multiwalled carbon nanotubes (CMWNTs) nanocomposite (PA66/APDMS-CMWNTs) was synthesized using a one-pot method, and the product was melt-spun into fibers. The glass transition temperature (T g) of the PA66/APDMS-CMWNTs nanocomposite fiber is 68.0 C, which is 22% higher than that of the pure PA66 fiber. This result indicates that there is a strong interfacial interaction between APDMS-CMWNTs and the PA66. Furthermore, the crystallinity of PA66/APDMS-CMWNTs nanocomposite fiber reaches a maximum due to the addition of APDMS-CMWNTs. Additionally, the tensile strength and Young's modulus of PA66/APDMS-CMWNTs nanocomposite fiber are 167% and 631% higher, respectively, than that of the pure PA66 fiber. The strengthening mechanism was discussed using force balance-based expression, which demonstrates that the stress on the PA66 is more efficiently transferred to the APDMS-CMWNTs. These results argue that using APDMS-CMWNTs as a filler can enhance the physical-mechanical properties of PA66 with an elevated degree never being reported.

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Preferential Formation of SiOC over SiC Linkage upon Thermal Grafting on Hydrogen‐Terminated Silicon (111)

Cited by 42 publications

References 49 publications

Influences of Doping and Crystal Orientation on Surface Roughening upon Alcohol Grafting onto Silicon Hydride

Influences of Doping and Crystal Orientation on Surface Roughening upon Alcohol Grafting onto Silicon Hydride

A Mechanistic Study of the Oxidative Reaction of Hydrogen-Terminated Si(111) Surfaces with Liquid Methanol

Enhancement of physical and mechanical properties of polyamide 66 fibers using polysiloxane‐functionalized multi‐walled carbon nanotubes

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