Solid-Solution Nanoparticles: Use of a Nonhydrolytic Sol−Gel Synthesis To Prepare HfO2 and HfxZr1-xO2 Nanocrystals
Abstract
A nonhydrolytic sol−gel process closely following that of Hyeon et al. for the synthesis of ZrO 2 nanocrystals ( J. Am. Chem. Soc. 2003, 125, 6553−6557) was used to synthesize highly crystalline and monodisperse HfO 2 nanoparticles. Reactions of hafnium isopropoxide with hafnium halides at high temperature in a strongly coordinating solvent yield nanometer-sized particles of HfO 2 . The size, shape, and crystalline phase of the hafnia particles depend on both the reaction temperature and the halide. The nonhydrolytic cross-condensation method was also extended to the binary metal oxides nanocrystals, i.e., HfO 2 −ZrO 2, ZrO 2 −TiO 2, and HfO 2 −TiO 2 . Efforts to prepare nanocrystals of Hf x Zr 1 - x O 2 over a wide range of x were successful; however, this method could not be used to prepare either Zr x Ti 1 - x O 2 or Hf x Ti 1 - x O 2 . In conjunction with X-ray powder diffraction and high-resolution transmission electron microscopy, Raman spectroscopy identifies the structural phase of the nanocrystals and also proves the formation of the Hf−Zr solid solution nanoparticles via the cross-condensation method. In the case of Hf x Zr 1 - x O 2, for x < 0.5, highly monodisperse, roughly spherical particles of tetragonal Hf x Zr 1 - x O 2 were formed, while for x > 0.5, small nanorods of the monoclinic phase of the binary oxide were obtained.
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TiO2, ZrO2, and HfO2 can create diverse nanostructures with controlled dimensions and distinctive morphologies using surfactant-mediated synthesis.
“TiO2, ZrO2, and HfO2 exhibits the ability to create diverse nanostructures with controlled dimensions and distinctive morphologies using surfactant-mediated synthesis [46,54,55].”
From Recent Advances in Metal-Oxide-Based Photoresists for EUV Lithography (2024) · cites this paper as [55]
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- Authors
- Tang, J., Fabbri, J., Robinson, R. D., Zhu, Y., Herman, I. P., Steigerwald, M. L., & Brus, L. E.
- Affiliations
- Brookhaven National Laboratory (US)
- Corresponding author
- Steigerwald, Michael L.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-03-11
- Volume
- 16
- Issue
- 7
- Pages
- 1336-1342
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W1965145270
- Cited by
- 154
- References
- 16
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 12 · 2023: 5 · 2022: 3 · 2021: 7 · 2020: 5 · 2019: 9 · 2018: 7 · 2017: 5 · 2016: 10 · 2015: 6 · 2014: 5 · 2013: 6 · 2012: 6
- FWCI
- 7.28
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Chemistry of Materials (publishedVersion)
- Funders
- Division of Materials Research
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Chemical and Physical Properties of Materials
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Semiconductor materials and devices
- Physical Sciences › Materials Science › Materials Chemistry › Quantum Dots Synthesis And Properties
- Keywords
- hafnium oxide nanoparticles, cross-condensation, ZrO2 nanocrystals, nanocrystalline TiO2, monoclinic and tetragonal phases, nanorods, monodisperse particles, crystalline phase
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