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Electronic Detection of Oxygen Adsorption and Size‐Specific Doping of Few‐Atom Gold Clusters on Graphene
Author(s) -
Scheerder Jeroen E.,
Liu Shuanglong,
Zharinov Vyacheslav S.,
Reckinger Nicolas,
Colomer JeanFrançois,
Cheng HaiPing,
Van de Vondel Joris,
Janssens Ewald
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201801274
Subject(s) - graphene , materials science , adsorption , cluster (spacecraft) , gold cluster , chemical physics , doping , atom (system on chip) , nanotechnology , density functional theory , chemistry , computational chemistry , optoelectronics , computer science , embedded system , programming language
Graphene's sensitivity to adsorbed particles has attracted widespread attention because of its potential sensor applications. Size‐selected few‐atom clusters are promising candidates as adparticles to graphene. Due to their small size, physicochemical properties are dominated by quantum size effects. In particular, few‐atom gold clusters demonstrate a significant catalytic activity in various oxidation reactions. In this joint experimental and computational work, size‐selected gold clusters with 3 and 6 atoms adsorbed on graphene field‐effect transistors and their interaction with molecular oxygen are investigated. While oxygen adsorbs at both cluster sizes, there is a pronounced cluster size dependence in the corresponding doping, as demonstrated via first‐principle calculations and electronic transport measurements. Furthermore, the doping of gold cluster decorated graphene changes sign from n‐ to p‐doping upon oxygen adsorption, directly evidencing electron transfer to the oxygen molecules and hence their activation. These observations pinpoint graphene as a valuable platform to investigate and exploit size‐dependent cluster properties.