Metal Immiscibility Route to Synthesis of Ultrathin Carbides, Borides, and Nitrides

Wang, Zixing and Kochat, Vidya and Pandey, Prafull and Kashyap, Sanjay and Chattopadhyay, Soham and Samanta, Atanu and Sarkar, Suman and Manimunda, Praveena and Zhang, Xiang and Asif, Syed and Singh, Abhisek K and Chattopadhyay, Kamanio and Tiwary, Chandra Sekhar and Ajayan, Pulickel M (2017) Metal Immiscibility Route to Synthesis of Ultrathin Carbides, Borides, and Nitrides. In: ADVANCED MATERIALS, 29 (29).

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Abstract

Ultrathin ceramic coatings are of high interest as protective coatings from aviation to biomedical applications. Here, a generic approach of making scalable ultrathin transition metal-carbide/boride/nitride using immiscibility of two metals is demonstrated. Ultrathin tantalum carbide, nitride, and boride are grown using chemical vapor deposition by heating a tantalum-copper bilayer with corresponding precursor (C2H2, B powder, and NH3). The ultrathin crystals are found on the copper surface (opposite of the metal-metal junction). A detailed microscopy analysis followed by density functional theory based calculation demonstrates the migration mechanism, where Ta atoms prefer to stay in clusters in the Cu matrix. These ultrathin materials have good interface attachment with Cu, improving the scratch resistance and oxidation resistance of Cu. This metal-metal immiscibility system can be extended to other metals to synthesize metal carbide, boride, and nitride coatings.

Item Type:	Journal Article
Publication:	ADVANCED MATERIALS
Additional Information:	Copy right for this article belongs to the WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Department/Centre:	Division of Chemical Sciences > Materials Research Centre Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Sep 2017 07:36
Last Modified:	01 Sep 2017 07:36
URI:	http://eprints.iisc.ac.in/id/eprint/57706

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