Monolithic Zinc Oxide Aerogels from Organometallic Sol-Gel Precursors

Krumm, Michael; Lizandara Pueyo, Carlos; Polarz, Sebastian

Monolithic Zinc Oxide Aerogels from Organometallic Sol-Gel Precursors

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Datum

2010

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Chemistry of Materials. 2010, 22(18), pp. 5129-5136. ISSN 0897-4756. Available under: doi: 10.1021/cm1006907

Zusammenfassung

Aerogels belong to the large class of porous solids. They are characterized by a network of a mechanically stable solid, most likely inorganic in nature comprising a large gas volume in comparison to the volume of the solid material. Although a large variety of aerogels with silicate networks already exist, examples for materials with transition metal oxide networks are rare. One particularly interesting target is zinc oxide because of its semiconducting and multifunctional character. A sol gel process facilitating an organometallic precursor system is established. The mechanism of gelation has been studied in detail. Unlike most other sol gel processes, at first a large number of nanocrystalline ZnO particles are formed that rapidly agglomerate to secondary aggregates instead of forming a network directly. Thus, these secondary aggregates determine the textural properties of the pore walls as they assemble into the final, highly cross-linked network. A monolithic ZnO aerogel with porosities greater than 99% could be received after solvent extraction with supercritical CO2. Furthermore, the porosities could be tuned via a combination of conventional drying and supercritical solvent extraction by a process that we call scalar drying. Finally, one of the potential functional properties of the new ZnO aerogels was proven, its application in photocatalysis.

Fachgebiet (DDC)

540 Chemie

Schlagwörter

ZnO thin-films, optical-properties, low-density, nanoparticles, photocatalysis, transparent, size, deposition, nanoscale, complexes

Zitieren

ISO 690

KRUMM, Michael, Carlos LIZANDARA PUEYO, Sebastian POLARZ, 2010. Monolithic Zinc Oxide Aerogels from Organometallic Sol-Gel Precursors. In: Chemistry of Materials. 2010, 22(18), pp. 5129-5136. ISSN 0897-4756. Available under: doi: 10.1021/cm1006907

BibTex

@article{Krumm2010Monol-13967,
  year={2010},
  doi={10.1021/cm1006907},
  title={Monolithic Zinc Oxide Aerogels from Organometallic Sol-Gel Precursors},
  number={18},
  volume={22},
  issn={0897-4756},
  journal={Chemistry of Materials},
  pages={5129--5136},
  author={Krumm, Michael and Lizandara Pueyo, Carlos and Polarz, Sebastian}
}

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