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Aerosol-assisted Chemical Vapor Deposition of Metal Oxide Structures: Zinc Oxide Rods
Published on: September 14, 2017
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An efficient laser vaporization source for chemically modified metal clusters characterized by thermodynamics and
Tsugunosuke Masubuchi1, Jan F Eckhard1, Kathrin Lange1
1Chair of Physical Chemistry, Catalysis Research Center, Department of Chemistry, Technische Universität München, Lichtenbergstraße 4, 85748 Garching, Germany.
The Review of Scientific Instruments
|March 3, 2018
Summary
A new laser vaporization cluster source efficiently produces chemically modified metal clusters, including tantalum oxide cations. This system allows control over metal-to-oxygen ratios and generates reaction intermediates for further study.
Area of Science:
- Materials Science
- Physical Chemistry
- Nanotechnology
Background:
- Efficient gas-phase production of chemically modified metal clusters is crucial for materials science.
- Controlling the composition and reactivity of metal clusters is an ongoing challenge.
Purpose of the Study:
- To present a novel laser vaporization cluster source for efficient gas-phase production of chemically modified metal clusters.
- To evaluate the source's performance in producing tantalum (Ta) and tantalum oxide (TaₓO<0xE1><0xB5><0xA7>⁺) cluster cations.
- To demonstrate control over the metal-to-oxygen ratio and explore the generation of reaction intermediates.
Main Methods:
- Utilized a laser vaporization cluster source with separate aggregation and reactor volumes, each equipped with a pulsed valve.
- Introduced oxygen (O₂) as a reactant to form tantalum oxide clusters.
- Employed reaction kinetic modeling to analyze the reaction conditions and temperatures.
Main Results:
- Successfully produced TaₓO<0xE1><0xB5><0xA7>⁺ (y ≥ 0) cluster cations over a wide mass range.
- Demonstrated precise control over the metal-to-oxygen ratio by adjusting the O₂ pulse duration.
- Reaction kinetic modeling indicated oxide generation occurs at <300 K under thermalized conditions, while metal cores form with excess heat.
Conclusions:
- The developed cluster source enables efficient, tunable synthesis of metal oxide clusters.
- The controlled conditions facilitate the production of valuable reaction intermediates for reactivity studies.
- This technology offers a versatile platform for exploring the chemistry of modified metal clusters.
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