Molecular beam deposition of nanoscale ionic liquids in ultrahigh vacuum

Shingo Maruyama, Yoko Takeyama, Hiroki Taniguchi, Hiroki Fukumoto, Mitsuru Itoh, Hiroshi Kumigashira, Masaharu Oshima, Takakazu Yamamoto, Yuji Matsumoto

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


We propose a new approach to nanoscience and technology for ionic liquids (ILs): molecular beam deposition of IL in ultrahigh vacuum by using a continuous wave infrared (CW-IR) laser deposition technique. This approach has made it possible to prepare a variety of "nano-IL" with the given composition on the substrate: a nanodroplet, on one hand, the volume of which goes down to 1 aL and, on the other hand, an ultrathin film with a thickness to several 100 nm or less. The result of fractional distillation of a binary mixture of ILs, investigated by nuclear magnetic resonance as well as electrospray ionization time-of-flight mass spectrometry, indicates that this deposition process is based on the thermal evaporation of ILs, and thus this process also can be used as a new purification method of ILs in vacuum. Furthermore, the fabrication of binary mixture droplets of two ILs on the substrate by alternating deposition of two ILs was demonstrated; the homogeneity of the composition was confirmed even for one single droplet by high-spatial-resolution Raman spectroscopy.

Original languageEnglish
Pages (from-to)5946-5952
Number of pages7
JournalACS Nano
Issue number10
Publication statusPublished - 2010 Oct 26
Externally publishedYes


  • CW-IR laser deposition
  • fractional distillation
  • ionic liquids
  • liquid thin film
  • nanodroplets

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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