The Winner Takes It All: Carbon Supersedes Hexagonal Boron Nitride with Graphene on Transition Metals at High Temperatures - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Small Year : 2022

The Winner Takes It All: Carbon Supersedes Hexagonal Boron Nitride with Graphene on Transition Metals at High Temperatures

Ari Paavo Seitsonen
Thomas Greber
Huanyao Cun

Abstract

The production of high-quality hexagonal boron nitride (h-BN) is essential for the ultimate performance of 2D materials-based devices, since it is the key 2D encapsulation material. Here, a decisive guideline is reported for fabricating high-quality h-BN on transition metals. It is crucial to exclude carbon from the h-BN related process, otherwise carbon prevails over boron and nitrogen due to its larger binding energy, thereupon forming graphene on metals after high-temperature annealing. The surface reaction-assisted conversion from h-BN to graphene with high-temperature treatments is demonstrated. The pyrolysis temperature Tp is an important quality indicator for h-BN/metals. When the temperature is lower than Tp, the quality of the h-BN layer is improved upon annealing. While the annealing temperature is above Tp, in case of carbon-free conditions, the h-BN disintegrates and nitrogen desorbs from the surface more easily than boron, eventually leading to clean metal surfaces. However, once the h-BN layer is exposed to carbon, graphene forms on Pt(111) in the high-temperature regime. This not only provides an indispensable principle (avoid carbon) for fabricating high-quality h-BN materials on transition metals, but also offers a straightforward method for the surface reaction-assisted conversion from h-BN to graphene on Pt(111).

Dates and versions

cea-04076303 , version 1 (20-04-2023)

Identifiers

Cite

Adrian Hemmi, Ari Paavo Seitsonen, Thomas Greber, Huanyao Cun. The Winner Takes It All: Carbon Supersedes Hexagonal Boron Nitride with Graphene on Transition Metals at High Temperatures. Small, 2022, 18 (49), pp.2205184. ⟨10.1002/smll.202205184⟩. ⟨cea-04076303⟩

Collections

CEA ENS-PARIS PSL

Altmetric

Share

Gmail Facebook X LinkedIn More