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Angelique Faramus

Angelique Faramus

Postdoc
Ultrasmall Nanoparticles
Research Unit: Hybrid Nanomaterials
Room: 0-206
Phone: 0721/608-26883
angelique faramusErw0∂kit edu

Karlsruhe Institute of Technology (KIT)
Institute of Nanotechnology
Hermann-von-Helmholtz-Platz 1
76344 Eggenstein-Leopoldshafen, Germany


Project

Silicon nanoparticles

 

Researchers involved: Angelique Faramus, Chien-Wei Hsu and Nadia Licciardello

Silicon nanoparticles (Si Nps) are a very interesting field of research because of their applications in biological fluorescence imaging and in optoelectronic devices. Due to quantum confinement effects, silicon nanoparticles have special optical and electronic properties and, in particular, they show a bright luminescence that is strongly dependent on their size.  Recently Si NPs get more and more attention because of their several advantages like non-toxicity, highly stability against photobleaching and easiness to be further functionalized with biomolecules (like antibodies) to be used as luminescent labels.

Obtaining Si Nps with a size smaller than 5 nm is still challenging because they are very prone to oxidation that can be avoided only with a complete capping of the surface. We are one of the partners of the project of Helmholtz Virtual Institute 'NanoTracking' (http://www.hzdr.de/db/Cms?pNid=2452), a project between several groups whose major aim is to develop nanomaterials for cancer imaging. In our group, we are mainly focused on the preparation (by wet chemistry) and characterization of amine and alkene capped silicon nanoparticles with different sizes and, in particular, with a size between 1.5-3 nm. The methods that we used are both reduction and oxidation methods. 

 

Reduction method:

 

 

Fig. 1: General reaction scheme

       

 

 

Fig. 2: TEM image, corresponding particle size distribution histogram and dominant emission of 3-aminopropyl terminated Si Nps in water (particle size distribution of 1.57 ± 0.24 nm) Picture of a UV irradiated solution of amine capped Si Nps (size 1-4 nm) obtained in our laboratories   

 

Oxidation method:

  

 

Fig. 3: General reaction scheme and picture of a UV irradiated solution of Si-C4H7 nanoparticles prepared in our laboratory

References:
1. M. Rosso-Vasic, E. Spruijt, B. van Lagen, L. De Cola, H. Zuilhof, Small, 2008, 4, 1835-1841.
2. Milena Rosso-Vasic, Evan Spruijt, Zoran Popović, Karin Overgaag, Barend van Lagen, Bruno Grandidier, Daniel Vanmaekelbergh, David Domínguez-Gutiérrez, Luisa De Cola, Han Zuilhof, J. Mater. Chem., 2009, 19, 5926–5933.

Curriculum

Angélique Faramus was born in 1985 in Loudéac (Brittany, France). She has obtained a one year postdoctoral fellowship in Professor Luisa De Cola’s group at the Karlsruhe Institute of Technology from March 2015.

She underwent B.Sc. studies in the University of Rennes 1 (France) and she obtained a M.Sc. degree as part of the Erasmus Mundus program from both the University of Rennes 1 (France) and the Ludwig Maximilians Universität in Munich (Germany) in 2009. Her M.Sc. thesis research was conducted in the laboratory of Inorganic Chemistry at Kyoto University (Japan) under the supervision of Professor Yuichi Shimakawa. In 2010, she enrolled in a PhD degree under the supervision of Professor Richard Tilley at Victoria University of Wellington and the MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand). Her research concerned the synthesis and characterization of semiconductor nanocrystals towards their use in solar cells. After graduating in 2014, Angelique worked for 10 months as a postdoctoral research assistant in the Faculty of Engineering at Victoria University of Wellington (New Zealand) with Dr. Gideon Gouws. In March 2015, she joined the group of Professor De Cola at the Institute of Nanotechnology at KIT as a postdoctoral fellow.