A simple method for preparation of silica aerogels doped with monodispersed nanoparticles in homogeneous concentration

Guy Lazovski*, Galit Bar, Botao Ji, Nurit Atar, Uri Banin, Raz Gvishi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Silica aerogel is a solid matrix, capable of preserving the unique properties of nanoparticles incorporated in it; forming a macroscopic structure that benefits from nano-metric properties. We developed a simple method for preparation of doped silica aerogels. Dopants are implemented as silica coated nanoparticles suspended in alcohol or alcohol:water mixture. This suspension replaces a portion of the pure solvent in the one-step base catalyzed silica aerogel recipe. Aerogels doped with, Au nano-spheres, Ag nano-platelets, and CdSe/CdS core/shell quantum dots, were prepared. These aerogels exhibit homogeneous mono-dispersion of the nanoparticles, and possess the nanoparticles' unique optical properties. Additionally, doping does not affect the gelation process or the silica matrix. We envision that using this methodology, many other silica coated nanoparticles can be implemented as dopants. Furthermore, complex systems of several co-dopants can be obtained in a reproducible manner. Such aerogels can be tailor made for a vast range of applications.

Original languageAmerican English
Article number104496
JournalJournal of Supercritical Fluids
Volume159
DOIs
StatePublished - 1 May 2020

Bibliographical note

Publisher Copyright:
© 2019

Keywords

  • Doped silica aerogel
  • Nanoparticles
  • Optical properties
  • Quantum dots
  • Super critical drying

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