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Influence of interparticle interaction on melting of gold nanoparticles in Au/PTFE nanocomposites

Oleg Yeshchenko 1Igor Dmitruk 1Konstantin P. Grytsenko 2Vadym M. Prokopets 1Andriy V. Kotko 3Sigurd Schrader 4

1. Physics Department, National Taras Shevchenko Kyiv University, Akad.Glushkov prosp.2, Kiev 03127, Ukraine
2. V. Lashkaryov Institute of Semiconductor Physics NASU (ISP), 41, pr. Nauki, Kiev 03028, Ukraine
3. Frantsevich Institute for Problems of Materials Science (IPMS), 3, Krzhizhanivsky Str., Kiev 03680, Ukraine
4. Univesity of Applied Sciences, Bahnhofstrasse 1, Wildau 15745, Germany


We studied the temperature behaviour of the absorption spectra of Au/PTFE nanocomposites with various filling factors at 77-936 K. The obtained temperature dependences of surface plasmon energy and bandwidth in gold nanoparticles with size of 5 nm proves the aggregation of nanoparticles due to thermal softening of polymer matrix and consequent melting of nanoparticles with formation of isolated large (about 25 nm) nanoparticles. The melting of gold nanoparticles occurs at temperatures considerably lower than the melting point of bulk gold. The interaction between the gold nanoparticles significantly affects the melting of the nanoparticles. When the filling factor increases the melting point of gold nanoparticles decreases and the spectral signature of their melting become stronger.


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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium I, by Oleg Yeshchenko
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-04-27 15:42
Revised:   2009-06-07 00:48