title: Enhanced Electronic Communication and Electrochemical Sensitivity Benefiting from the Cooperation of Quadruple Hydrogen Bonding and π-π Interactions in Graphene/Multi-Walled Carbon Nanotube Hybrids.
abstract: By designing a molecule labeled as UPPY with both ureidopyrimidinone (UP) and pyrene (PY) units, the supramolecular self-assembly of multiwalled carbon nanotube (MWNT) and reduced graphene oxide (rGO) was driven by the UP quadruple hydrogen-bonding and PY-based π-π interactions to form a novel hybrid of rGO-UPPY-MWNT in which the morphology of rGO-wrapped MWNT was found. Bridged by the two kinds of noncovalent bonding, enhanced electronic communication occurred in rGO-UPPY-MWNT. Also, under the cooperation of UP quadruple hydrogen-bonding and PY-based π-π interactions, higher electrical conductivity and better charge transfer were observed for rGO-UPPY-MWNT, compared with the rGO-MWNT composite without such noncovalent bonds, and that with just single PY-based π-π interaction (rGO-PY-MWNT) or UP quadruple hydrogen bond (rGO-UP-MWNT). Specifically, the electrical conductivity of rGO-PY-MWNT hybrids was increased approximately sevenfold, and the interfacial charge transfer resistance was nearly decreased by 1 order of magnitude compared with rGO-MWNT, rGO-UP-MWNT, and rGO-PY-MWNT. Resulting from its excellent electrical conductivity and charge transfer properties, the rGO-UPPY-MWNT modified electrode exhibited enhanced electrochemical activity toward dopamine with detection limit as low as 20 nM.
authors.affiliation: Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University , Xi'an 710021, China.
authors.forename: Qiguan
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University , Xi'an 710021, China.
authors.forename: Sumin
authors.identifier: http://orcid.org/0000-0002-6784-5927
authors.initials: S
authors.lastname: Wang
authors.affiliation: Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University , Xi'an 710021, China.
authors.forename: Jiayin
authors.initials: J
authors.lastname: Shang
authors.affiliation: Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University , Xi'an 710021, China.
authors.forename: Shenbao
authors.initials: S
authors.lastname: Qiu
authors.affiliation: Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University , Xi'an 710021, China.
authors.forename: Wenzhi
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University , Xi'an 710021, China.
authors.forename: Xinming
authors.initials: X
authors.lastname: Wu
authors.affiliation: Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University , Xi'an 710021, China.
authors.forename: Jinhua
authors.initials: J
authors.lastname: Li
authors.affiliation: Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, School of Materials and Chemical Engineering, Xi'an Technological University , Xi'an 710021, China.
authors.forename: Weixing
authors.initials: W
authors.lastname: Chen
authors.affiliation: School of Chemistry and Chemical Engineering, Henan University , Kaifeng 475004, China.
authors.forename: Xinhai
authors.initials: X
authors.lastname: Wang
keywords: MWNT and graphene; electrochemistry; electronic communication; quadruple hydrogen bonds; π−π interactions