Journal
ACS NANO
Volume 12, Issue 3, Pages 2634-2642Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b08718
Keywords
van der Waals crystals; quasi-one-dimensional materials; thermal conductivity; phonon focusing; ballistic phonon transport
Categories
Funding
- U.S. National Science foundation [DMR-1308550, DMR-1308509, CBET-1403456, DMR-1532107]
- Naval Engineering Education Consortium (NEEC) program [N00174-16-C-0008]
- U.S. Department of Energy [DE-SC0014208]
- Louisiana Board of Regents under Grant LEQSF [(2015-18)-RD-A-23]
- Fundamental Research Funds for the Central Universities
- Innovative Project for Graduate Students of Jiangsu Province [KYLX15_0058]
- National Natural Science Foundation of China [51435003]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1308550, 1308509] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1462866] Funding Source: National Science Foundation
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Van der Waals (vdW) crystals with covalently bonded building blocks assembled together through vdW interactions have attracted tremendous attention recently because of their interesting properties and promising applications. Compared to the explosive research on two-dimensional (2D) vdW materials, quasi-one-dimensional (quasi-1D) vdW crystals have received considerably less attention, while they also present rich physics and engineering implications. Here we report on the thermal conductivity of exfoliated quasi-1D Ta2Pd3Se8 vdW nano wires. Interestingly, even though the interatomic interactions along each molecular chain are much stronger than the interchain vdW interactions, the measured thermal conductivity still demonstrates a clear dependence on the cross-sectional size up to >110 nm. The results also reveal that partial ballistic phonon transport can persist over 13 mu m at room temperature along the molecular chain direction, the longest experimentally observed ballistic transport distance with observable effects on thermal conductivity so far. First principles calculations suggest that the ultralong ballistic phonon transport arises from the highly focused longitudinal phonons propagating along the molecular chains. These data help to understand phonon transport through quasi-1D vdW crystals, facilitating various applications of this class of materials.
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