title: Electrochemical Grafting of Graphene Nano Platelets with Aryl Diazonium Salts.
abstract: To vary interfacial properties, electrochemical grafting of graphene nano platelets (GNP) with 3,5-dichlorophenyl diazonium tetrafluoroborate (aryl-Cl) and 4-nitrobenzene diazonium tetrafluoroborate (aryl-NO2) was realized in a potentiodynamic mode. The covalently bonded aryl layers on GNP were characterized using atomic force microscopy and X-ray photoelectron spectroscopy. Electrochemical conversion of aryl-NO2into aryl-NH2was conducted. The voltammetric and impedance behavior of negatively and positively charged redox probes (Fe(CN)63-/4-and Ru(NH3)62+/3+) on three kinds of aryl layers grafted on GNP reveal that their interfacial properties are determined by the charge states of redox probes and reactive terminal groups (-Cl, -NO2, -NH2) in aryl layers. On aryl-Cl and aryl-NH2garted GNP, selective and sensitive monitoring of positively charged lead ions as well as negatively charged nitrite and sulfite ions was achieved, respectively. Such a grafting procedure is thus a perfect way to design and control interfacial properties of graphene.
authors.affiliation: School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor & Green Chemical Technology, Wuhan Institute of Technology , Wuhan 430073, China.
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Qiu
authors.affiliation: School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor & Green Chemical Technology, Wuhan Institute of Technology , Wuhan 430073, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yu
authors.affiliation: School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor & Green Chemical Technology, Wuhan Institute of Technology , Wuhan 430073, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Yan
authors.affiliation: School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor & Green Chemical Technology, Wuhan Institute of Technology , Wuhan 430073, China.
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Wang
authors.affiliation: School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor & Green Chemical Technology, Wuhan Institute of Technology , Wuhan 430073, China.
authors.forename: Qijin
authors.initials: Q
authors.lastname: Wan
authors.affiliation: School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor & Green Chemical Technology, Wuhan Institute of Technology , Wuhan 430073, China.|Institute of Materials Engineering, University of Siegen , Siegen 57076, Germany.
authors.forename: Nianjun
authors.initials: N
authors.lastname: Yang
keywords: aryl diazonium salts; charge effect; electrochemical grafting; graphene nanoplatelets; inorganic ions