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Water-induced hydrogenation of graphene/metal interfaces at room temperature:Insights on water intercalation and identification of sites for water splitting

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Nano Research 2019年第12期12卷 3101-3108页

作者： Guangyu He Qi Wang Hak Ki Yu Daniel Farias Yingchun Liu Antonio Politano Department of Chemistry Zhejiang UniversityHangzhou 310027China Department of Materials Science and Engineering and Department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea Departamento de Ftsica de la Materia Condensada Universidad Autonoma de MadridMadrid 28049Spain Instituto"Nicolas Cabrera"and Condensed Matter Physics Center(IFIMAC) Universidad Autonoma de MadridMadrid 28049Spain Department of Physical and Chemical Sciences University of L'AquilaVia Vetoio 10L'Aquila 1-67100Italy CNR-IMM Istituto per la Microelettronica e Microsistemi VIII strada 5Catania 1-95121Italy

Though it is well recognized that the space between graphene cover and the metal substrate canact as a two-dimensional(2D)nanoreactor,several issues are still unresolved,including the role of the metal substrate,the mechanisms ruling water intercalation and the identification ofsites at which water is ***,we solve these issues by means of density functional theory and high-resolution electron energyloss spectroscopy experiments carried out on graphene grown on(111)-oriented Cu ***,we observe decomposition of H2O atroom temperature with only H atoms forming bonds with graphene and with buried OH groups underneath the graphene *** model discloses physicochemical mechanisms ruling the migration and decomposition of water on graphene/*** discover thatthe edge of graphene can be easily saturated by H through decomposition of H2O,which allows H2O to migrate in the subsurface region from thedecoupled edge,where H2O decomposes at room *** atoms produced by the decomposition of H2O initially form a chemicalbond with graphene for the lower energy barrier compared with other *** findings are essential to exploit graphene/Cu interfaces incatalysis and in energy-related applications.

关键词： graphene/metal interfaces intercalation water splitting room temperature

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Near-field infrared response of graphene on copper substrate

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Frontiers of physics 2022年第4期17卷 75-81页

作者： Zhen-Bing Dai Gui Cen Zhibin Zhang Xinyu Lv Kaihui Liu Zhiqiang Li College of Physics Sichuan UniversityChengdu 610065China School of Physics Peking UniversityBeijing 100871China Department of Physics Sichuan Normal UniversityChengdu 610066China

The electronic properties of graphene are very sensitive to its dielectric *** coupling to a metal substrate can give rise to many novel quantum effects in graphene,such as band renormalization and plasmons with unusual properties,which are of high technological *** nanoimaging are very suitable for exploring these effects considering their energy and length ***,we report near-field infrared nanoimaging studies of graphene on copper synthesized by chemical vapor ***,our measurements reveal three different types of near-field optical responses of graphene,which are very distinct from the near-field edge fringes observed in the *** results can be understood from the modification of optical conductivity of graphene due to its coupling with the *** work provides a framework for identifying the near-field response of graphene in graphene/metal systems and paves the way for studying their novel physics and potential applications.

关键词： near-field infrared response graphene copper graphene/metal

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