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Anomalous isotope effect on mechanical properties of single atomic layer Boron Nitride

Version 2 2024-06-03, 00:34
Version 1 2023-10-26, 04:27
journal contribution
posted on 2024-06-03, 00:34 authored by Alexey Falin, Haifeng Lv, Eli Janzen, James H Edgar, Rui Zhang, Dong Qian, Hwo-Shuenn Sheu, Qiran Cai, Wei Gan, Xiaojun Wu, Elton JG Santos, Lu Hua Li
AbstractThe ideal mechanical properties and behaviors of materials without the influence of defects are of great fundamental and engineering significance but considered inaccessible. Here, we use single-atom-thin isotopically pure hexagonal boron nitride (hBN) to demonstrate that two-dimensional (2D) materials offer us close-to ideal experimental platforms to study intrinsic mechanical phenomena. The highly delicate isotope effect on the mechanical properties of monolayer hBN is directly measured by indentation: lighter 10B gives rise to higher elasticity and strength than heavier 11B. This anomalous isotope effect establishes that the intrinsic mechanical properties without the effect of defects could be measured, and the so-called ultrafine and normally neglected isotopic perturbation in nuclear charge distribution sometimes plays a more critical role than the isotopic mass effect in the mechanical and other physical properties of materials.

History

Journal

Nature Communications

Volume

14

Article number

5331

Pagination

1-9

Location

London, Eng.

ISSN

2041-1723

eISSN

2041-1723

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Issue

1

Publisher

Nature Research

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