Crystallization of amorphous SiO2 microtubes catalyzed by lithium

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Lili Zhao
  • Na Li
  • Andreas Langner
  • Martin Steinhart
  • Teh Y. Tan
  • Eckhard Pippel
  • Herbert Hofmeister
  • Ulrich Gösele

Detail(s)

Original languageEnglish
Pages (from-to)1952-1957
Journal / PublicationAdvanced Functional Materials
Volume17
Issue number12
Publication statusPublished - 13 Aug 2007
Externally publishedYes

Abstract

Amorphous silica formed by thermally oxidizing silicon is commonly eligible for lithographic patterning or can be grown on patterned substrates. However, it is still a challenge to combine controlled microstructuring with controlled crystallization of SiO<sub>2</sub>. Here, it is shown that traces of volatile lithium species transported through the gas phase catalyze the crystallization of silica integrated into common silicon microstructures. The selected crystallization temperature determines which polymorph forms. As an example, the formation of quartz, tridymite, and cristobalite microtubes by thermally oxidizing macroporous silicon is investigated. Lithium-induced crystallization may extend state-of-the-art silicon technology and yield nano- and microstructures consisting of different silica polymorphs, which are, in contrast to many functional oxides, nontoxic. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.

Bibliographic Note

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Citation Format(s)

Crystallization of amorphous SiO2 microtubes catalyzed by lithium. / Zhao, Lili; Li, Na; Langner, Andreas; Steinhart, Martin; Tan, Teh Y.; Pippel, Eckhard; Hofmeister, Herbert; Tu, King-Ning; Gösele, Ulrich.

In: Advanced Functional Materials, Vol. 17, No. 12, 13.08.2007, p. 1952-1957.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review