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

研究成果: Article査読

31 被引用数 (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.

ジャーナルACS Nano
出版ステータスPublished - 2010 10 26

ASJC Scopus subject areas

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

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