Confinement in carbon nanospace-induced production of KI nanocrystals of high-pressure phase

Koki Urita; Yuichi Shiga; Toshihiko Fujimori; Taku Iiyama; Yoshiyuki Hattori; Hirofumi Kanoh; Tomonori Ohba; Hideki Tanaka; Masako Yudasaka; Sumio Iijima; Isamu Moriguchi; Fujio Okino; Morinobu Endo; Katsumi Kaneko

doi:10.1021/ja202565r

Confinement in carbon nanospace-induced production of KI nanocrystals of high-pressure phase

J Am Chem Soc. 2011 Jul 13;133(27):10344-7. doi: 10.1021/ja202565r. Epub 2011 Jun 16.

Authors

Koki Urita¹, Yuichi Shiga, Toshihiko Fujimori, Taku Iiyama, Yoshiyuki Hattori, Hirofumi Kanoh, Tomonori Ohba, Hideki Tanaka, Masako Yudasaka, Sumio Iijima, Isamu Moriguchi, Fujio Okino, Morinobu Endo, Katsumi Kaneko

Affiliation

¹ Department of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.

PMID: 21667920
DOI: 10.1021/ja202565r

Abstract

An outstanding compression function for materials preparation exhibited by nanospaces of single-walled carbon nanohorns (SWCNHs) was studied using the B1-to-B2 solid phase transition of KI crystals at 1.9 GPa. High-resolution transmission electron microscopy and synchrotron X-ray diffraction examinations provided evidence that KI nanocrystals doped in the nanotube spaces of SWCNHs at pressures below 0.1 MPa had the super-high-pressure B2 phase structure, which is induced at pressures above 1.9 GPa in bulk KI crystals. This finding of the supercompression function of the carbon nanotubular spaces can lead to the development of a new compression-free route to precious materials whose syntheses require the application of high pressure.