title: Graphene-Semiconductor Catalytic Nanodiodes for Quantitative Detection of Hot Electrons Induced by a Chemical Reaction.
abstract: Direct detection of hot electrons generated by exothermic surface reactions on nanocatalysts is an effective strategy to obtain insight into electronic excitation during chemical reactions. For this purpose, we fabricated a novel catalytic nanodiode based on a Schottky junction between a single layer of graphene and an n-type TiO2 layer that enables the detection of hot electron flows produced by hydrogen oxidation on Pt nanoparticles. By making a comparative analysis of data obtained from measuring the hot electron current (chemicurrent) and turnover frequency, we demonstrate that graphene's unique electronic structure and extraordinary material properties, including its atomically thin nature and ballistic electron transport, allow improved conductivity at the interface between the catalytic Pt nanoparticles and the support. Thereby, graphene-based nanodiodes offer an effective and facile way to approach the study of chemical energy conversion mechanisms in composite catalysts with carbon-based supports.
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea.|Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) , Daejeon 34141, Republic of Korea.
authors.forename: Hyosun
authors.initials: H
authors.lastname: Lee
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea.|Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) , Daejeon 34141, Republic of Korea.
authors.forename: Ievgen I
authors.initials: II
authors.lastname: Nedrygailov
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea.|Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) , Daejeon 34141, Republic of Korea.
authors.forename: Young Keun
authors.initials: YK
authors.lastname: Lee
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea.|Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) , Daejeon 34141, Republic of Korea.
authors.forename: Changhwan
authors.initials: C
authors.lastname: Lee
authors.affiliation: Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI) , Daejeon 34129, Republic of Korea.
authors.forename: Hongkyw
authors.initials: H
authors.lastname: Choi
authors.affiliation: Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI) , Daejeon 34129, Republic of Korea.
authors.forename: Jin Sik
authors.initials: JS
authors.lastname: Choi
authors.affiliation: Creative Research Center for Graphene Electronics, Electronics and Telecommunications Research Institute (ETRI) , Daejeon 34129, Republic of Korea.
authors.forename: Choon-Gi
authors.initials: CG
authors.lastname: Choi
authors.affiliation: Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Republic of Korea.|Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS) , Daejeon 34141, Republic of Korea.
authors.forename: Jeong Young
authors.initials: JY
authors.lastname: Park
keywords: Hot electron; Schottky junction and Pt nanoparticles; TiO2; catalytic nanodiodes; graphene