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RESEARCH PRODUCT

Tunable Superstructures of Dendronized Graphene Nanoribbons in Liquid Phase

Yiyong MaiMichael Ryan HansenAlexander TriesFugui XuNerea BilbaoHai I. WangHeng ZhangChunyang YuMathias KläuiMischa BonnKristoffer Basse

subject

530 PhysicsBand gapChemistry MultidisciplinaryExcitonSupramolecular chemistryNanowireNanotechnology010402 general chemistry01 natural sciencesBiochemistryCatalysisColloid and Surface ChemistryPHOTOCONDUCTIVITYDENDRIMERSSuperstructureScience & TechnologyChemistryBOTTOM-UP SYNTHESISPhotoconductivityGeneral Chemistry530 Physik0104 chemical sciencesELECTRONIC-PROPERTIESChemistryEDGENanofiberPhysical SciencesGraphene nanoribbons

description

In this Communication, we report the first synthesis of structurally well-defined graphene nanoribbons (GNRs) functionalized with dendritic polymers. The resultant GNRs possess grafting ratios of 0.59-0.68 for the dendrons of different generations. Remarkably, the precise 3D branched conformation of the grafted dendrons affords the GNRs unprecedented 1D supramolecular self-assembly behavior in tetrahydrofuran (THF), yielding nanowires, helices and nanofibers depending on the dimension of the dendrons. The GNR superstructures in THF exhibit near-infrared absorption with maxima between 650 and 700 nm, yielding an optical bandgap of 1.2-1.3 eV. Ultrafast photoconductivity analyses unveil that the helical structures exhibit the longest free carrier (3.5 ps) and exciton lifetime (several hundred ps) among the three superstructure systems. This study opens pathways for tunable construction of ordered GNR superstructures with promising optoelectronic applications. ispartof: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY vol:141 issue:28 pages:10972-10977 ispartof: location:United States status: published

yearjournalcountryeditionlanguage
2019-07-01Journal of the American Chemical Society
https://doi.org/10.1021/jacs.9b04927