title: Fractal growth mechanism of sp3-bonded 5H-BN microcones by plasma-assisted pulsed-laser chemical vapor deposition.
abstract: Here we propose a repetitive photochemical reaction and diffusion model for the fractal pattern formation of sp(3)-bonded 5H-BN microcones in laser-assisted plasma chemical vapor deposition, which was observed experimentally and reported previously. This model describing the behavior of the surface density of precursor species gave explanations to (1) the "line-drawing" nature of the patterns, (2) the origin of the scale-invariant self-similarity (fractality) of the pattern, and (3) the temperature-dependent uniform to fractal transition. The results have implications for controlling the self-organized arrangements of electron-emitter cones at the micro-and nanoscale by adjusting macroscopically the boundary condition (L(X),L(Y)) for the deposition, which will be very effective in improving the electron field emission properties.
authors.affiliation: Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. komatsu.shojiro@nims.go.jp
authors.forename: Shojiro
authors.initials: S
authors.lastname: Komatsu
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kazami
authors.forename: Hironori
authors.initials: H
authors.lastname: Tanaka
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Moriyoshi
authors.forename: Masaharu
authors.initials: M
authors.lastname: Shiratani
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Okada