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Studium dimerů molekulárními můstky spojených stříbrných nanočástic pomocí metody SERS
Šmejkal, P. ; Vlčková, B. ; Moskovits, M. ; Pavel, I. ; Sládková, M. ; Pavlova, Ewa ; Šlouf, Miroslav
The ability of several molecules to act as linkers for Ag nanoparticles was tested. As new prospective linker molecules, dimercaptocarborane, ethidium bromide and 5,10,15,20-tetrakis(4-sulphonatophenyl)porphine (TSPP) were selected owing to their terminal functional groups, which can assemble the Ag nanoparticles together to form a dimer.
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Změny velikostí zlatých nanočástic vysokoenergetickými laserovými pulsy
Dammer, Ondřej ; Pfleger, Jiří ; Šlouf, Miroslav ; Vlčková, B.
We focused on the interaction of gold nanoparticles of various mean size embedded in aqueous environment with nanosecond pulsed laser irradiation of various energy per pulse at wavelength 355 and 532 nm, respectively. We performed a sequence of in-situ surface plasmon extinction (SPE) measurements of the fragmented hydrosol as well as ex-situ TEM studies to evaluate the size distribution of resulting Au nanoparticles. It was found that laser pulses of 355 nm wavelength provide smaller nanoparticles compared with 532 nm pulses at the same absorbed energy.
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Srovnání časově fluktujících SERS signálů dimerů porfyrinem spojených nanočástic stříbra s malými agregáty, připravenými ve vodním a organickém prostředí
Vlčková, B. ; Moskovits, M. ; Sládková, M. ; Pavel, I. ; Šlouf, Miroslav ; Šišková, K.
Formation of 5,10,15,20-tetrakis(4-aminophenyl)porphine -bridged dimers and small aggregates of Ag nanoparticles capped by pentylamine and/or citrate was established by SEM and TEM respectively. From both samples, temporally fluctuating SERS signals were obtained.
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