Selective deposition of platinum hemispheres on the {100} facets of synthetic diamond

• Published in: Diamond and related materials Vol. 101; p. 107620
• Main Authors: Bokhonov, Boris B., Dudina, Dina V., Kato, Hidemi, Wada, Takeshi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-01-2020; Elsevier BV
• Subjects: Aqueous solutions; Diamond microcrystals; Diamonds; Facet-selective deposition; Galvanic replacement; Hemispheres; Heterostructures; Hollow hemisphere; Microcrystals; Morphology; Noble metals; Platinum; Silver; Synthesis; Galvanic replacement; Facet-selective deposition; Hollow hemisphere; Diamond microcrystals; Platinum
• ISSN: 0925-9635; 1879-0062
• DOI: 10.1016/j.diamond.2019.107620

In this work, a two-step preparation method of diamond-metal heterostructures, in which platinum particles are attached to the {100} facets of diamond microcrystals, was elaborated. At the first step, silver particles are deposited on the {100} facets of the synthetic diamond crystals by the powder annealing method. At the second step, the microcrystals having silver particles deposited on their surface are treated by aqueous solution of hexachloroplatinic acid H2PtCl6. The treatment results in the formation of hollow platinum hemispheres on the {100} facets of the diamond crystals. Detailed morphological studies of the synthesized heterostructures have been conducted to reveal a nanocrystalline structure of the hollow platinum hemispheres. Diamond-noble metal heterostructures of these morphology and composition have been synthesized and investigated for the first time.
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•A new preparation method of diamond-metal heterostructures has been elaborated.•Hollow Pt hemispheres were selectively deposited on the {100} diamond facets using galvanic replacement reaction.•The developed deposition method is suitable for fabricating a variety of noble metal-containing heterostructures.