Molecular geometry influencing thermal-based nucleophilic reactions on silicon (111) hydride surfaces

Lee, C.H.; Khung, Yit Lung

doi:10.1016/j.apsusc.2020.146697

Cited by 7 publications

(7 citation statements)

References 40 publications

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“…The XPS deconvolution of the 3-Butyn-1-ol sample for thermal excitation showed a single peak at 101.4 eV that was characteristic of Si-O-X [45]. The presence of a single peak can be explained by the concentration level of 3-Butyn-1-ol (10% concentration in this study).…”

Section: Resultssupporting

confidence: 45%

“…The presence of a single peak can be explained by the concentration level of 3-Butyn-1-ol (10% concentration in this study). As demonstrated in the past [45], as the concentration of 3-Butyn-1-ol increased, the spectrum tended to lose its Si2p peaks and the reaction proceeded through the nucleophile OH to form Si-O-C bonds at the surface. On the contrary, for the sonochemical reaction, three distinct peaks were successfully fitted during the deconvolution.…”

Section: Resultsmentioning

confidence: 83%

“…Furthermore, two peaks were successfully fitted in the thermal reaction spectrum analysis of 3-Butyn-1-ol. As shown in Figure 4b, the smaller peak at the same position of 532.4 eV indicated a Si-O/C-O linkage type while the larger peak fitted at 531.1 eV was representative of Si-O-C bond [45,70]. Comparatively, the deconvolution of the sonochemical reaction sample resulted in a unique peak at 532.2 eV which was suggestive of a Si-O/C-O bonding type [71,72].…”

Section: Resultsmentioning

confidence: 93%

“…Multiple sets of analyses and measurements (triplicates) were conducted after the sample preparation to obtain substantial information to help understand the reactions. Firstly, the outcome of the thermal reactions could be anticipated in view of our previous reports [45,47,48]. More importantly, several questions remained pertaining to how the sonochemical reactions will affect the grafting of the nucleophiles and how the bifunctionality of an alkyne and NH 2 groups may compete with each other during the sonochemical reaction.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, to shed light into the reaction mechanisms and the preferential bond directionality between unsaturated carbon and nucleophiles during sonochemical reaction, a comparative analysis between sonochemical reaction and thermal excitation was made to conceptualize the overall reaction route of the cyclopropylamine and 3-Butyn-1-ol molecules under both reaction conditions. Thermal reactions of nucleophile were included in this comparative study because our group had previously reported in many accounts the specific preference of nucleophile reacting to silicon hydride surfaces under high temperatures [19,[43][44][45]. This would enable a quick comparison between both reaction processes.…”

Section: Introductionmentioning

confidence: 99%

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Sonochemical Reaction of Bifunctional Molecules on Silicon (111) Hydride Surface

2021

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While the sonochemical grafting of molecules on silicon hydride surface to form stable Si–C bond via hydrosilylation has been previously described, the susceptibility towards nucleophilic functional groups during the sonochemical reaction process remains unclear. In this work, a competitive study between a well-established thermal reaction and sonochemical reaction of nucleophilic molecules (cyclopropylamine and 3-Butyn-1-ol) was performed on p-type silicon hydride (111) surfaces. The nature of surface grafting from these reactions was examined through contact angle measurements, X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Cyclopropylamine, being a sensitive radical clock, did not experience any ring-opening events. This suggested that either the Si–H may not have undergone homolysis as reported previously under sonochemical reaction or that the interaction to the surface hydride via a lone-pair electron coordination bond was reversible during the process. On the other hand, silicon back-bond breakage and subsequent surface roughening were observed for 3-Butyn-1-ol at high-temperature grafting (≈150 °C). Interestingly, the sonochemical reaction did not produce appreciable topographical changes to surfaces at the nano scale and the further XPS analysis may suggest Si–C formation. This indicated that while a sonochemical reaction may be indifferent towards nucleophilic groups, the surface was more reactive towards unsaturated carbons. To the best of the author’s knowledge, this is the first attempt at elucidating the underlying reactivity mechanisms of nucleophilic groups and unsaturated carbon bonds during sonochemical reaction of silicon hydride surfaces.

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Section: Resultssupporting

confidence: 45%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sonochemical Reaction of Bifunctional Molecules on Silicon (111) Hydride Surface

2021

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Tailoring Dense, Orientation–Tunable, and Interleavedly Structured Carbon‐Based Heat Dissipation Plates

Peng

Chen

et al. 2023

Advanced Science

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The controllability of the microstructure of a compressed hierarchical building block is essential for optimizing a variety of performance parameters, such as thermal management. However, owing to the strong orientation effect during compression molding, optimizing the alignment of materials perpendicular to the direction of pressure is challenging. Herein, to illustrate the effect of the ordered microstructure on heat dissipation, thermally conductive carbon‐based materials are fabricated by tailoring dense, orientation–tunable, and interleaved structures. Vertically aligned carbon nanotube arrays (VACNTs) interconnected with graphene films (GF) are prepared as a 3D core‐ordered material to fabricate compressed building blocks of O–VA–GF and S–VA–GF. Leveraging the densified interleaved structure offered by VACNTs, the hierarchical O–VA–GF achieves excellent through‐plane (41.7 W m−1 K−1) and in‐plane (397.9 W m−1 K−1) thermal conductivities, outperforming similar composites of S–VA–GF (through‐plane: 10.3 W m−1 K−1 and in‐plane: 240.9 W m−1 K−1) with horizontally collapsed carbon nanotubes. As heat dissipation plates, these orderly assembled composites yield a 144% and 44% enhancement in the cooling coefficient compared with conventional Si3N4 for cooling high‐power light‐emitting diode chips.

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Thermal grafting of aniline derivatives to silicon (1 1 1) hydride surfaces

Khung

Rusli

Hsiao

2022

Applied Surface Science

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Molecular geometry influencing thermal-based nucleophilic reactions on silicon (111) hydride surfaces

Cited by 7 publications

References 40 publications

Sonochemical Reaction of Bifunctional Molecules on Silicon (111) Hydride Surface

Sonochemical Reaction of Bifunctional Molecules on Silicon (111) Hydride Surface

Tailoring Dense, Orientation–Tunable, and Interleavedly Structured Carbon‐Based Heat Dissipation Plates

Thermal grafting of aniline derivatives to silicon (1 1 1) hydride surfaces

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