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Gold Nanoparticles with Elongated Shapes: Synthesis and Optical Properties

100%
Olejnik M., Agarwal A., Zaleszczyk W., Kotov N., Mackowski S.
Acta Physica Polonica A
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2012
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vol. 122
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issue 2
346-349
EN
We use a seed-mediated growth to fabricate gold nanorods in water solution. By changing the amount of silver salt we demonstrate the control of aspect ratio of the obtained rods. The microscopic and spectroscopic analyses provide ways to characterize the morphology and the optical properties of the gold nanorods. Nanorods synthesized using this approach feature length of the order of 50-60 nm, which translates into longitudinal plasmon resonances in the near infrared spectrum region.
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Anisotropic Elastic and Acoustic Properties of Bulk Graphene Nanoplatelets Consolidated by Spark Plasma Sintering

100%
Koller M., Seiner H., Landa M., Nieto A., Agarwal A.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
670-674
EN
Elastic anisotropy and acoustic attenuation in bulk material consisting of consolidated graphene nanoplatelets are studied. The material was prepared by spark plasma sintering, and exhibits highly anisotropic microstructure with the graphene nanoplatelets oriented perpendicular to the spark plasma sintering compression axis. The complete tensor of elastic constants is obtained using a combination of two ultrasonic methods: the through-transmission method and the resonant ultrasound spectroscopy. It is shown that the examined material exhibits very strong anisotropy both in the elasticity (the Young moduli in directions parallel to the graphene nanoplatelets and perpendicular to them differ by more than 20 times) and in the attenuation, where the dissipative effect of the internal friction in the graphene nanoplatelets combines with strong scattering losses due to the porosity. The results are compared with those obtained for ceramic-matrix/graphene nanoplatelet composites by the same ultrasonic methods.
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Plasmon Enhancement of Fluorescence in Single Light-Harvesting Complexes from em Amphidinium carterae

59%
Bujak Ł., Piątkowski D., Mackowski S., Wörmke S., Jung C., Bräuchle C., Agarwal A., Kotov N., Schulte T., Hofmann E., Brotosudarmo T., Scheer H., Govorov A., Hiller R.
Acta Physica Polonica A
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2009
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vol. 116
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issue S
S-22-S-25
EN
We show that single peridinin-chlorophyll a-protein light-harvesting complexes from dinoflagellate Amphidinium carterae placed near to silver nanoparticles show strongly enhanced fluorescence emission. Single molecule spectroscopy experiments performed at room temperature point toward an enhancement of more than an order of magnitude for optimal conditions. Irrespective of the enhancement, we observe no effect of the metal nanoparticle on the fluorescence emission energy of the complex. This result provides a way to control the optical properties of biomolecules via plasmon excitations in metal nanoparticles.
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