Pressure and Nitrogen Induced Phase Transition in Bilayer CVD Graphene

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10508661" target="_blank" >RIV/00216208:11320/25:10508661 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=vcjcv1yGE-" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=vcjcv1yGE-</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/admt.202500929" target="_blank" >10.1002/admt.202500929</a>

Result language

angličtina

Original language name

Pressure and Nitrogen Induced Phase Transition in Bilayer CVD Graphene

Original language description

Pressure-activated phase-transitions in 2D materials like graphene open new possibilities for developing materials with exceptional mechanical properties. Previous studies show that pressure-induced sp(2)-to-sp(3) phase-transitions occur only in epitaxial graphene on SiC. Unfortunately, this system has limitations for industrial applications. On the other hand, graphene synthesized by chemical vapor deposition (CVD) is cost-effective, scalable, and transferable on different substrates. However, pressure-activated sp(2)-to-sp(3) phase-transitions are absent in exfoliated graphene. Here, this work demonstrates that nitrogen-doping can enable pressure-induced graphene-to-diamond phase transitions in bilayer CVD graphene films on SiO(2) at room temperature. The sp(2)-to-sp(3) phase transition is verified by measuring with modulated nanoindentation (MoNI) the stiffness of the films as a function of the number of layers. Specifically, the indentation stiffness of a SiO(2) substrate covered with a nitrogen-doped bilayer CVD graphene film almost doubles compared to bare SiO(2); in contrast, nitrogen-doped single and multi-layer graphene films do not improve the stiffness of a SiO(2) substrate. Molecular dynamics simulations confirm that nitrogen favors the formation of sp(3)-coordinated carbon atoms and covalent bonding between two graphene layers when the films are under compression. Nitrogen-doping emerges as an effective way to obtain exceptional lightweight protective coatings utilizing scalable large-size CVD bilayer graphene films.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Advanced Materials Technologies

ISSN

2365-709X

e-ISSN

—

Volume of the periodical

11

Issue of the periodical within the volume

2

Country of publishing house

DE - GERMANY

Number of pages

10

Pages from-to

e00929

UT code for WoS article

001584069200001

EID of the result in the Scopus database

2-s2.0-105018208073