Real-time observation of graphene oxidation on Pt(111) by low-energy electron microscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10333684" target="_blank" >RIV/00216208:11320/16:10333684 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.susc.2015.08.042" target="_blank" >http://dx.doi.org/10.1016/j.susc.2015.08.042</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.susc.2015.08.042" target="_blank" >10.1016/j.susc.2015.08.042</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Real-time observation of graphene oxidation on Pt(111) by low-energy electron microscopy

Popis výsledku v původním jazyce

A monolayer of graphene was prepared by thermal decomposition of ethylene gas on Pt(111). The graphene can be readily removed by dosing O-2 at pressures in 10(-8) mbar range and surface temperatures (T-s) near 1000 K. Residual gas analysis during the oxygen treatment of graphene layer detected CO to be the only formed product. The oxidation process has been continuously imaged by Low-energy Electron Microscope (LEEM) operated in mirror-electron mode. LEEM observations revealed that the oxidation of graphene on Pt(111) occurs simultaneously at the outer island perimeter and in the interior of the graphene island. Symmetric hexagonal pits were observed to form continuously within graphene sheets, the pits proceeded isotropically. The etch rate was determined to be equal for both modes and independent of the surface environment with the exception of areas above Pt step edges. The pit growth rate at constant oxygen pressure was found to increase exponentially with respect to temperature over the investigated T-s range of 927-1014K, yielding an apparent activation energy of 479 kJ/mol. (C) 2015 Published by Elsevier B.V.

Název v anglickém jazyce

Real-time observation of graphene oxidation on Pt(111) by low-energy electron microscopy

Popis výsledku anglicky

A monolayer of graphene was prepared by thermal decomposition of ethylene gas on Pt(111). The graphene can be readily removed by dosing O-2 at pressures in 10(-8) mbar range and surface temperatures (T-s) near 1000 K. Residual gas analysis during the oxygen treatment of graphene layer detected CO to be the only formed product. The oxidation process has been continuously imaged by Low-energy Electron Microscope (LEEM) operated in mirror-electron mode. LEEM observations revealed that the oxidation of graphene on Pt(111) occurs simultaneously at the outer island perimeter and in the interior of the graphene island. Symmetric hexagonal pits were observed to form continuously within graphene sheets, the pits proceeded isotropically. The etch rate was determined to be equal for both modes and independent of the surface environment with the exception of areas above Pt step edges. The pit growth rate at constant oxygen pressure was found to increase exponentially with respect to temperature over the investigated T-s range of 927-1014K, yielding an apparent activation energy of 479 kJ/mol. (C) 2015 Published by Elsevier B.V.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Surface Science

ISSN

0039-6028

e-ISSN

—

Svazek periodika

644

Číslo periodika v rámci svazku

Feb

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

5

Strana od-do

165-169

Kód UT WoS článku

000367489000025

EID výsledku v databázi Scopus

2-s2.0-84949625331