Flash ignition of freestanding porous silicon films: Effects of film thickness and porosity

Yuma Ohkura; Jeffrey M. Weisse; Lili Cai; Xiaolin Zheng

doi:10.1021/nl403114g

Flash ignition of freestanding porous silicon films: Effects of film thickness and porosity

Yuma Ohkura, Jeffrey M. Weisse, Lili Cai, Xiaolin Zheng

Research output: Contribution to journal › Article › peer-review

Abstract

We report the first successful xenon flash ignition of freestanding porous Si films in air. The minimum flash ignition energy (E_min) first decreases and then increases with increasing the porous Si film thickness due to the competition between light absorption and heat loss. The E_min is lower for higher porosity film because high porosity reduces both the heat capacity and the thermal conductivity, facilitating the temperature rise. These results are important for initiating controlled porous Si combustion and preventing their unwanted combustion for safety reasons.

Original language	English (US)
Pages (from-to)	5528-5533
Number of pages	6
Journal	Nano letters
Volume	13
Issue number	11
DOIs	https://doi.org/10.1021/nl403114g
State	Published - Nov 13 2013
Externally published	Yes

Keywords

Porous silicon
energetic materials
flash ignition
ignition
minimum ignition energy

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

Online availability

10.1021/nl403114g

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abstract = "We report the first successful xenon flash ignition of freestanding porous Si films in air. The minimum flash ignition energy (Emin) first decreases and then increases with increasing the porous Si film thickness due to the competition between light absorption and heat loss. The Emin is lower for higher porosity film because high porosity reduces both the heat capacity and the thermal conductivity, facilitating the temperature rise. These results are important for initiating controlled porous Si combustion and preventing their unwanted combustion for safety reasons.",

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PY - 2013/11/13

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AB - We report the first successful xenon flash ignition of freestanding porous Si films in air. The minimum flash ignition energy (Emin) first decreases and then increases with increasing the porous Si film thickness due to the competition between light absorption and heat loss. The Emin is lower for higher porosity film because high porosity reduces both the heat capacity and the thermal conductivity, facilitating the temperature rise. These results are important for initiating controlled porous Si combustion and preventing their unwanted combustion for safety reasons.

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KW - flash ignition

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KW - minimum ignition energy

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Flash ignition of freestanding porous silicon films: Effects of film thickness and porosity

Abstract

Keywords

ASJC Scopus subject areas

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