Colloquium
Department of Physics, NCU
Formation of Magic-number C60-clusters on a Surface Mediated by Atomic Scale Moire Magnifiers
Speaker
王玉麟博士（Dr. Yuh-Lin Wang）
中研院原分所（IAMS, Academia Sinica）
Date 2013.10.22(Tue)
Time 14:00
Place S4-625
「歡迎大學部同學參加，可獲得中大護照認證2小時」
The ability to create an ensemble of
nanostructures with specific size, shape, and arrangement on particular positions in space is one the most fundamentally important issues in the exploration nanoscience and realization nanotechnology. Since the discovery of Ga surface magic-number clusters (SMC), i. e. clusters exhibiting enhanced stability at certain sizes on a particular surface, on Si(111)-7×7 surface in 1998[1], there have been considerable efforts to further exploit the concept of SMC formation for the creation of monodispersed nanostructures on a single crystal surface[2-8].
Recently, we discovered the self-assembly of C60 molecules into islands with unusual shapes and preferred sizes on an Au-In-covered Si(111) surface. Specifically, 19-mer islands prefer a non-compact boomerang shape while hexagonal 37-mer islands exhibit extraordinarily enhanced stability and abundance. The novel self-assembly process is mediated by the moire interference between an island with its underlying lattice, which essentially maps out the adsorption-energy-landscape of a C60 on different positions of the surface with a lateral magnification factor and dictates the probability for a C60 to attach to the island’s peripheral subsequently. Our discovery points to a new paradigm of exploiting the moire interference to dynamically assist the self-assembly of particles and provides an unexplored tactic of engineering atomic scale moire-magnifier to facilitate the growth of monodispersed mesoscopic structures[9].
Reference:
[1] M. Y. Lai and Y. L. Wang, Phys. Rev. Lett. 81, 164(1998).
[2] Y. L. Wang and M. Y. Lai, J. Phys.: Condens. Matter 13, R589 (2001).
[3] M. Y. Lai and Y. L. Wang, Phys. Rev. B 64, 241404(R) (2001).
[4] V. G. Kotlyar et al., Phys. Rev. B 66, 165401 (2002).
[5] J. L. Li et al., Phys. Rev. Lett. 88, 066101 (2002).
[6] H. H. Chang, et al., Phys. Rev. Lett. 92, 066103 (2004).
[7] Y. L. Wang et al., Internation. Rev. Phys. Chem. 27, 317 (2008).
[8] M. Y. Lai, et al., Phys. Rev. Lett. 106, 166101 (2011).
[9] D. V. Gruznev, A.V. Matetskiy, L.V. Bondarenko, O.A. Utas, A.V. Zotov, A.A. Saranin, J.P. Chou, C.M. Wei, M.Y.Lai, and Y.L. Wang, Nat. Commun. 4, 1679 (2013).