Excimer laser ablation of gold-loaded inverse polystyrene-block-poly (2-vinylpyridine) micelles |
| |
Authors: | G Lengl A Plettl P Ziemann JP Spatz M Möller |
| |
Institution: | Abt. Festk?rperphysik, Universit?t Ulm, 89069 Ulm, Germany (Fax: +49-731/502-2987, E-mail: paul.ziemann@physik.uni-ulm.de), DE Abt. Organische Chemie III, Universit?t Ulm, 89069 Ulm, Germany (Fax: +49-731/502-2883, E-mail: martin.moeller@chemie.uni-ulm.de), DE
|
| |
Abstract: | Diblock-copolymers (PS(1700)-b-P2VP(450) or PS(1350)-b-P2VP(400)) forming spherical micelles, can be loaded with a Au-salt
and deposited on top of various substrates. Such polymer films have been exposed to a pulsed ArF excimer laser in order to
remove the polymer matrix and, in parallel, to chemically reduce the salt into metallic Au nanodots. To analyze this process
in detail, it was subdivided into three steps: (a) laser ablation of thick and thin diblock-copolymer films; (b) laser irradiation
of Au-salt loaded diblock-copolymer films; and (c) laser irradiation of arrays of metallic Au nanodots. In (a) it was found
that a complete removal of the polymer by laser ablation is only possible in air under ambient conditions while identical
laser irradiations under vacuum result in a residual layer of approximately 14 nm. Substep (b) revealed a nucleation process
of the resulting metallic Au within the micellar core leading to clusters of small Au dots. Furthermore, this substep provided
evidence for an asymmetric interplay between the macroscopic temperature of a polymer film during laser treatment and the
energy density per laser pulse. In (c) it could be demonstrated that metallic Au nanodots on mica are stable against laser
irradiation under conditions leading to a polymer removal.
Received: 7 August 2000 / Accepted: 2 November 2000 / Published online: 3 April 2001 |
| |
Keywords: | PACS: 61 46 +w 61 80 Ba 78 66 Qn |
本文献已被 SpringerLink 等数据库收录! |
|