Synthesis of aligned nanowire arrays by shaping of nanometals with swift heavy ions modelling and atomistic simulations
Synthesis of aligned nanowire arrays by shaping of nanometals with swift heavy ions modelling and atomistic simulations
Heinig, K.-H.; Vredenberg, A.; Toulemonde, M.; Nordlund, K.
The functionality of nanoparticles can be extended by shape anisotropy. Thus, for future hard disks, rod-like nanomagnets are more resistant against thermally activated spin flipping than spheres, and, for photonics, light is guided as surface plasmon-polariton along a chain of rods with less damping than along a chain of spheres. Recently it has been shown [1] that Au nanospheres embedded in SiO2 can be shaped into rods (and even wires) by swift heavy ion irradiation. The underlying mechanisms are largely unknown. Van Dillen has proven [2] that the Trinkaus model [3], which describes successfully the ion beam shaping of dielectrics/semiconductors, can not be applied to ion beam shaping of metal nanoparticles. Here, a consistent mechanism of ion beam shaping and nanowire ripening will be presented. Using the temperature-time profiles of ion tracks in SiO2 as delivered by Toulemonde [4], atomistic computer experiments performed with kinetic Monte-Carlo and Molecular Dynamics codes reproduce the experimental results [5]. Our comprehensive numerical studies facilitate a further optimisation of ion beam shaping.
[1] A. Vredenberg et al., IBMM2004 Conf., Monterey (USA), Sept5 - 10, 2004.
[2] T. van Dillen, Int. Workshop Ion Beam Shaping, Amsterdam (Netherlands), Dec17, 2004.
[3] H. Trinkaus, J. Nucl. Mater. 223, 196 (1995).
[4] M. Toulemonde, Nucl. Instr. and Methods B66/67, 903 (2000), and private comm..
[5] K.-H. Heinig, talk OO7.5 at the MRS2005 Fall Meeting, Nov28-Dec01, 2005, Boston (USA).
Keywords: nanostructures; shaping; high-energy ion-irradiation; gold; silica; modeling; computer simulations
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Lecture (Conference)
E-MRS IUMRS ICEM Spring Meeting 2006, Symposium "Science and Technology of Nanotubes and Nanowires", 29.05.-02.06.2006, Nice, France
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Publ.-Id: 9284