期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.027402
关键词
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资金
- LANL LDRD program
- U.S. Department of Energy, Office of Science User Facility
- Fund for Scientific Research Flanders, Belgium (FWO) [G040011N, G021112N, 1513513N, 1512716N]
- Hercules Foundation [AUHA/13006]
- European Research Council (ERC) under Horizon/ERC starting Grant [679841]
- European Research Council (ERC) [679841] Funding Source: European Research Council (ERC)
Molecules confined inside single-walled carbon nanotubes (SWCNTs) behave quite differently from their bulk analogues. In this Letter we present temperature-dependent (4.2 K up to room temperature) photoluminescence (PL) spectra of water-filled and empty single-chirality (6,5) SWCNTs. Superimposed on a linear temperature-dependent PL spectral shift of the empty SWCNTs, an additional stepwise PL spectral shift of the water-filled SWCNTs is observed at similar to 150 K. With the empty SWCNTs serving as an ideal reference system, we assign this shift to temperature-induced changes occurring in the single-file chain of water molecules encapsulated in the tubes. Our molecular dynamics simulations further support the occurrence of a quasiphase transition of the orientational order of the water dipoles in the single-file chain.
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