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dc.contributor.authorSong, Zhibo
dc.contributor.authorWang, Qixing
dc.contributor.authorLi, Ming-yang
dc.contributor.authorLi, Lain-Jong
dc.contributor.authorZheng, Yu Jie
dc.contributor.authorWang, Zhuo
dc.contributor.authorLin, Tingting
dc.contributor.authorChi, Dongzhi
dc.contributor.authorDing, Zijing
dc.contributor.authorHuang, Yu Li
dc.contributor.authorThye Shen Wee, Andrew
dc.identifier.citationSong Z, Wang Q, Li M-Y, Li L-J, Zheng YJ, et al. (2018) Liquid-solid surface phase transformation of fluorinated fullerene on monolayer tungsten diselenide. Physical Review B 97. Available:
dc.description.abstractHybrid van der Waals heterostructures constructed by the integration of organic molecules and two-dimensional (2D) transition metal dichalcogenide (TMD) materials have useful tunable properties for flexible electronic devices. Due to the chemically inert and atomically smooth nature of the TMD surface, well-defined crystalline organic films form atomically sharp interfaces facilitating optimal device performance. Here, the surface phase transformation of the supramolecular packing structure of fluorinated fullerene (C60F48) on single-layer tungsten diselenide (WSe2) is revealed by low-temperature scanning tunneling microscopy, from thermally stable liquid to solid phases as the coverage increases. Statistical analysis of the intermolecular interaction potential reveals that the repulsive dipole-dipole interaction induced by interfacial charge transfer and substrate-mediated interactions play important roles in stabilizing the liquid C60F48 phases. Theoretical calculations further suggest that the dipole moment per C60F48 molecule varies with the surface molecule density, and the liquid-solid transformation could be understood from the perspective of the thermodynamic free energy for open systems. This study offers insights into the growth behavior at 2D organic/TMD hybrid heterointerfaces.
dc.description.sponsorshipA.T.S.W. acknowledges financial support from MOE AcRF Tier 1 Grant No. R-144-000-321-112 and the Graphene Re- search Centre. Y.L.H. and D.C. acknowledge the A-STAR SERC grant support for the 2D Growth Project under the 2D Pharos Program (SERC 1527000012). Calculations were performed on the Graphene Research Centre cluster supported by Prof. Su Ying Quek.
dc.publisherAmerican Physical Society (APS)
dc.rightsArchived with thanks to Physical Review B
dc.titleLiquid-solid surface phase transformation of fluorinated fullerene on monolayer tungsten diselenide
dc.contributor.departmentMaterials Science and Engineering Program
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalPhysical Review B
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionInstitute of Materials Research and Engineering (IMRE), ASTAR (Agency for Science, Technology, and Research), 2 Fusionopolis Way, Innovis, Singapore, 138634, , , Singapore
dc.contributor.institutionDepartment of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, , Singapore
dc.contributor.institutionCentre for Advanced 2D Materials, National University of Singapore, Level 6, 6 Science Drive 2, Singapore, 117546, , Singapore
dc.contributor.institutionResearch Center for Applied Sciences, Academia Sinica, Taipei, 10617, , , Taiwan
kaust.personLi, Ming-yang
kaust.personLi, Lain-Jong

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