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Electronic, optical and chemical properties of particles on the nanometer scale

English title Electronic, optical and chemical properties of particles on the nanometer scale
Applicant Oelhafen Peter
Number 117590
Funding scheme Project funding (Div. I-III)
Research institution Departement Physik Universität Basel
Institution of higher education University of Basel - BS
Main discipline Condensed Matter Physics
Start/End 01.10.2007 - 30.09.2009
Approved amount 198'633.00
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Keywords (11)

fullerenes; carbon nanotubes; cluster compounds; clusters on the nanometer scale; 2d self organized cluster arrangements; electronic properties; 3d self oganized cluster arrangements; optical properties; molecular electronics; Nanoparticles; molecular junctions

Lay Summary (English)

Lay summary
Different fullerene-based thin films have been deposited and investigated with particular interest in the effect of the structure on the optic properties. In particular, we studied the co-deposition of C60 with Si or SiO2 using a combination of evaporation and sputtering. The influence of defect formation on thin layers of pure C60 was also investigated. Silicon clusters embedded in a silicon dioxide matrix were prepared by ultrasound-assisted implantation resulting in a modified concentration of suboxide states. It is observed that photoluminescence properties are strongly correlated with the concentration of the suboxide states thereby providing evidence that besides a quantum confinement effect a closer look at the chemical composition of the nc-Si/SiO2 system is important. The electronic properties of metal electrodes in molecular junctions for future nanoelectronic devices were investigated. For this purpose, a 4-ATP self-assembled monolayer was prepared on top of a Au(111) crystal, which, in a second step, was metalized by a nearly closed Pd overlayer of monoatomic height. Photoelectron spectroscopy together with density functional theory taking into account all contributing parts of the molecular junction finally allowed analysis of its structural setup and its electronic properties. It was found that strong chemical interactions between the metal overlayer and the amino groups play a decisive role in determining the overall electronic properties, and thus the transport properties of the SAM/metal contact.We have developed a promising new method for the real-time characterization of carbon nanotube growth kinetics, based in continuous temperature monitoring in combination with NIR laser irradiation of the sample. Additionally, we have explored the possibility to control CNT growth at a local level, making use of the local electric field amplification associated to plasmon excitation in metallic particles.
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
109225 Electronic, optical and chemical properties of particles on the nanometer scale 01.10.2005 Project funding (Div. I-III)