title: Cooling dynamics of self-assembled monolayer coating for integrated gold nanocrystals on a glass substrate.
abstract: Picosecond time-resolved X-ray diffraction has been used to study the nanoscale thermal transportation dynamics of bare gold nanocrystals and thiol-based self-assembled monolayer (SAM)-coated integrated gold nanocrystals on a SiO2 glass substrate. A temporal lattice expansion of 0.30-0.33% was observed in the bare and SAM-coated nanocrystals on the glass substrate; the thermal energy inside the gold nanocrystals was transported to the contacted substrate through the gold-SiO2 interface. The interfacial thermal conductivity between the single-layered gold nanocrystal film and the SiO2 substrate is estimated to be 45 MW m(-2) K(-1) from the decay of the Au 111 peak shift, which was linearly dependent on the transient temperature. For the SAM-coated gold nanocrystals, the thermal dissipation was faster than that of the bare gold nanocrystal film. The thermal flow from the nanocrystals to the SAM-coated molecules promotes heat dissipation from the laser-heated SAM-coated gold nanocrystals. The thermal transportation of the laser-heated SAM-coated gold nanocrystal film was analyzed using the bidirectional thermal dissipation model.
authors.affiliation: Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: Kouhei
authors.initials: K
authors.lastname: Ichiyanagi
authors.affiliation: Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1 Sayo, Hyogo 679-5198, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sekiguchi
authors.affiliation: Deutsches Elektronen-Synchrotron (DESY), 85 Notkestrasse, Hamburg 22607, Germany.
authors.forename: Tokushi
authors.initials: T
authors.lastname: Sato
authors.affiliation: Deutsches Elektronen-Synchrotron (DESY), 85 Notkestrasse, Hamburg 22607, Germany.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Nozawa
authors.affiliation: Deutsches Elektronen-Synchrotron (DESY), 85 Notkestrasse, Hamburg 22607, Germany.
authors.forename: Ayana
authors.initials: A
authors.lastname: Tomita
authors.affiliation: Department of Chemistry and Materials Science, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan.
authors.forename: Manabu
authors.initials: M
authors.lastname: Hoshino
authors.affiliation: Deutsches Elektronen-Synchrotron (DESY), 85 Notkestrasse, Hamburg 22607, Germany.
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Adachi
authors.affiliation: Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: Yuji C
authors.initials: YC
authors.lastname: Sasaki
keywords: nanocrystal; thermal conductance; thermal flow; time-resolved X-ray diffraction