Crystallization of amorphous Si thin films by the reaction of MoO3/Al nanoengineered thermite

Bae, Jung Hyeon; Kim, Do Kyung; Jeong, Tae Hoon; Kim, Hyun Jae

doi:10.1016/j.tsf.2010.03.175

Cited by 13 publications

(9 citation statements)

References 16 publications

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“…Such an endotherm is not present in the Al/MoO 3 DSC plots; however, there is a second endotherm present in the Al/MoO 3 plot signifying two reactions occurring at two different temperatures. It may be concluded that the first peak corresponds to the oxidation of Al with MoO 3 particles, which is known to occur at around 540 °C . In order to understand the second peak of the heat curve, a DSC scan of the same thermite was performed with the identical sample size and heating rate in an exclusively argon (Ar) environment.…”

Section: Resultsmentioning

confidence: 99%

“…It may be concluded that the first peak corresponds to the oxidation of Al with MoO 3 particles, which is known to occur at around 540 °C. 28 In order to understand the second peak of the heat curve, a DSC scan of the same thermite was performed with the identical sample size and heating rate in an exclusively argon (Ar) environment. The resultant heat curve is shown in Figure 4.…”

Section: ■ Resultsmentioning

confidence: 99%

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Tuning Energetic Material Reactivity Using Surface Functionalization of Aluminum Fuels

et al. 2012

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Combustion analysis of three different thermites consisting of aluminum (Al) particles with and without surface functionalization combined with molybdenum trioxide (MoO3) was performed to study the effect of surface functionalization on flame propagation velocity (FPV). Two types of Al particles had self-assembled monolayers (SAMs) of perfluoro tetradecanoic (PFTD) and perfluoro sebacic (PFS) acids around the alumina shell, respectively; the other one did not. Flame speeds for Al with PFTD acid combined with MoO3 are 86% higher than Al/MoO3 whereas those for Al with PFS acid combined with MoO3 are almost half of Al/MoO3. The Al–PFTD structure is more sterically hindered and exhibits lower bond dissociation energy. This chemistry promotes increased flame speeds. Thermal equilibrium studies were performed using a differential scanning calorimeter and a thermogravimetric analyzer to determine activation energy (E a) of the thermites. Results are consistent with flame speed observations and showed an inverse relationship between flame speed and E a. This study shows that surface functionalization can be used as an approach to control the reactivity of Al particles.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Resultsmentioning

confidence: 99%

Tuning Energetic Material Reactivity Using Surface Functionalization of Aluminum Fuels

et al. 2012

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“…Impurities and Al oxidation were reduced by deposition in a strong vacuum and at a low substrate temperature. In this study, the heat energy from DSC was measured; it was approximately 1,178 J/g, which was higher than the 1,024 J/g of a previous research study for selective area crystallization of a-Si [9]. CuO nanowires coated with deposited nano-Al can be used as a crystallization energy source of a-Si.…”

Section: Resultsmentioning

confidence: 57%

Thermite Reaction Between CuO Nanowires and Al for the Crystallization of a-Si

Kim¹,

Bae²,

Kim

et al. 2010

Transactions on Electrical and Electronic Materials

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“…[31][32][33][34][35][36] The TRs may be initiated locally and then propagate in a self-sustained manner, which makes them extremely energy efficient. These reactions are of interest for a variety of applications, including as explosives, cutting and welding of metals, synthesis of materials, etc.…”

Section: Discussionmentioning

confidence: 99%

W and two-dimensional WO₃/W nanocrystals produced by controlled self-sustaining reduction of sodium tungstate

et al. 2013

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The influence of calcium fluoride (CaF 2 ) on combustion characteristics of Na 2 WO 4 1 3 Mg system and microstructure of the produced W and WO 3 /W crystals is investigated. The results of thermodynamic analysis and experimental investigations show that CaF 2 simultaneously enhances the conversion of Na 2 WO 4 toward tungsten and binds sodium through the formation of NaF phase. The examination of the microstructure of quenched combustion products and differential scanning calorimetry analysis indicate that at early stages of combustion, a part of Na 2 WO 4 is reduced by Mg to tungsten, whereas another part reacts with CaF 2 forming CaWO 4 and NaF. Subsequent magnesium reduction of CaWO 4 significantly increases the overall temperature of the combustion process. Such modification in reaction mechanism coupled with postcombustion processing (e.g., acid/basic treatment) of the product allows us to produce either pure tungsten nanocrystals or tungsten oxide-tungsten nanostructures consisting of two-dimensional WO 3 nanoflakes assembled on a W core. It is found that CaF 2 does not influence the sizes of tungsten nanocrystals. However, since the addition of CaF 2 leads to the increase of overall reaction temperature, it facilitates the formation of W particles with equilibrium crystal shape by faceting process.

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Crystallization of amorphous Si thin films by the reaction of MoO3/Al nanoengineered thermite

Cited by 13 publications

References 16 publications

Tuning Energetic Material Reactivity Using Surface Functionalization of Aluminum Fuels

Tuning Energetic Material Reactivity Using Surface Functionalization of Aluminum Fuels

Thermite Reaction Between CuO Nanowires and Al for the Crystallization of a-Si

W and two-dimensional WO₃/W nanocrystals produced by controlled self-sustaining reduction of sodium tungstate

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Crystallization of amorphous Si thin films by the reaction of MoO3/Al nanoengineered thermite

Cited by 13 publications

References 16 publications

Tuning Energetic Material Reactivity Using Surface Functionalization of Aluminum Fuels

Tuning Energetic Material Reactivity Using Surface Functionalization of Aluminum Fuels

Thermite Reaction Between CuO Nanowires and Al for the Crystallization of a-Si

W and two-dimensional WO3/W nanocrystals produced by controlled self-sustaining reduction of sodium tungstate

Contact Info

Product

Resources

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W and two-dimensional WO₃/W nanocrystals produced by controlled self-sustaining reduction of sodium tungstate