Functionalized Si/SiO2 quantum dots

C. Sima; C. Viespe; I. Nicolae; C. Grigoriu; G. Prodan; V. Ciupina; A. Cismileanu; C. Nistor; C. Nicolae; D. Donescu

doi:10.1117/12.756830

1 August 2007 Functionalized Si/SiO₂ quantum dots

C. Sima, C. Viespe, I. Nicolae, C. Grigoriu, G. Prodan, V. Ciupina, A. Cismileanu, C. Nistor, C. Nicolae, D. Donescu

Proceedings Volume 6785, ROMOPTO 2006: Eighth Conference on Optics; 67850K (2007) https://doi.org/10.1117/12.756830
Event: ROMOPTO 2006: Eighth Conference on Optics, 2006, Sibiu, Romania

Abstract

We report the functionalization of Si/SiO₂ Quantum Dots (QDs) synthesised by laser ablation. Our interest has been to increase the affinity of the QDs surface for organic substances, in order to obtain QD-immunoglobulin conjugates, particularly for biolabeling. We have studied the UV-induced graft polymerization of the freestanding nanoparticles. High resolution transmission electron microscopy and laser granulometry, were used to obtain information on particle and cluster size distribution, degree of agglomeration, etc. The polymer-dot complexes appeared as relatively well-defined clusters, QDs being surrounded by a polymer layer with thickness 3-10 nm. The size of the primary clusters was in the range 60-500 nm. The polymerization and filtration process (0.1 μm pores) involved a diminution of the clusters size in the range of 18-65 nm, and moreover, by a subsequent dialyses process the cluster size decreased to 5-15 nm.

Citation Download Citation

C. Sima, C. Viespe, I. Nicolae, C. Grigoriu, G. Prodan, V. Ciupina, A. Cismileanu, C. Nistor, C. Nicolae, and D. Donescu "Functionalized Si/SiO₂ quantum dots", Proc. SPIE 6785, ROMOPTO 2006: Eighth Conference on Optics, 67850K (1 August 2007); https://doi.org/10.1117/12.756830

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