Stability of Diborane Mixtures Used for Borophosphosilicate Glass Films

Flaherty, E.; Marshall, Jeff C.; Albert, P. A.; Brzychcy, Ann Marie; Forbes, D.; Halverson, Robert

doi:10.1149/1.2221628

Cited by 1 publication

(2 citation statements)

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“…Furthermore, the as‐formed diborane shown in Equation (1) may react with oxygen and water present in the reaction medium to form oxides of boron (the presence of the B−O bond is corroborated by FTIR spectroscopy, as detailed below) as shown in Equations

true 2 B_{2} H_{6} + 3 O_{2} \leftrightarrow 2 B_{2} O_{3} + 6 H_{2}

true B_{2} H_{6} + 3 H_{2} normalO \leftrightarrow B_{2} O_{3} + 6 H_{2}

…”

Section: Resultsmentioning

confidence: 91%

“…However, the GC–MS analysis suggests that the evolved gases are heavier boron hydrides. Thus, we posit that the diborane formed in Equation (1) may dissociate to form heavier boron hydrides [as shown in Equation (2)], and depending on the nuclearity of the boron hydrides, they form as volatile compounds, which are released as gases [Eq. ].

true B_{2} H_{6} \to normalh normale normala normalv normali normale normalr_normalb normalo normalr normalo normaln_normalh normaly normald normalr normali normald normale normals + H_{2}

…”

Section: Resultsmentioning

confidence: 99%

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Simple, Green, and High‐Yield Production of Boron‐Based Nanostructures with Diverse Morphologies by Dissolution and Recrystallization of Layered Magnesium Diboride Crystals in Water

Gunda

Das

2018

ChemPhysChem

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Layered metal diborides that contain metal atoms sandwiched between boron honeycomb planes offer a rich opportunity to access graphenic forms of boron. We recently demonstrated that magnesium diboride (MgB ) could be exfoliated by ultrasonication in water to yield boron-based nanosheets. However, knowledge of the fate of metal boride crystals in aqueous phases is still in its incipient stages. This work presents our preliminary findings on the discovery that MgB crystals can undergo dissolution in water under ambient conditions to result in precursors (prenucleation clusters) that, upon aging, undergo nonclassical crystallization preferentially growing in lateral directions by two-dimensional (2D) oriented attachment. We show that this recrystallization can be utilized as an avenue to obtain a high yield (≈92 %) of boron-based nanostructures, including nanodots, nanograins, nanoflakes, and nanosheets. These nanostructures comprise boron honeycomb planes chemically modified with hydride and oxy functional groups, which results in an overall negative charge on their surfaces. This ability of MgB crystals to yield prenucleation clusters that can self-seed to form nanostructures comprising chemically modified boron honeycomb planes presents a new facet to the physicochemical interaction of MgB with water. These findings also open newer avenues to obtain boron-based nanostructures with tunable morphologies by varying the chemical milieu during recrystallization.

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