title: Decrease in thermal conductivity in polymeric P3HT nanowires by size-reduction induced by crystal orientation: new approaches towards thermal transport engineering of organic materials.
abstract: To date, there is no experimental characterization of thermal conductivity of semiconductor polymeric individual nanowires embedded in a matrix. This work reports on scanning thermal microscopy measurements in a 3ω configuration to determine how the thermal conductivity of individual nanowires made of a model conjugated polymer (P3HT) is modified when decreasing their diameters. We observe a reduction of thermal conductivity, from λNW = 2.29 ± 0.15 W K(-1) m(-1) to λNW = 0.5 ± 0.24 W K(-1) m(-1), when the diameter of nanowires is reduced from 350 nm to 120 nm, which correlates with the polymer crystal orientation measured by WAXS. Through this work, the foundations for future polymer thermal transport engineering are presented.
authors.affiliation: Instituto de Microelectrónica de Madrid, Calle de Isaac Newton, 8 28760 Tres Cantos, Madrid, Spain. marisol@imm.cnm.csic.es.
authors.forename: Miguel Muñoz
authors.initials: MM
authors.lastname: Rojo
authors.forename: Jaime
authors.initials: J
authors.lastname: Martín
authors.forename: Stéphane
authors.initials: S
authors.lastname: Grauby
authors.forename: Theodorian
authors.initials: T
authors.lastname: Borca-Tasciuc
authors.forename: Stefan
authors.initials: S
authors.lastname: Dilhaire
authors.forename: Marisol
authors.initials: M
authors.lastname: Martin-Gonzalez