Silicon nanocrystals dispersed in water: Photosensitizers for molecular oxygen

Goller, B.; Polisski, S.; Wiggers, H.; Kovalev, D.
May 2010
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p211901
Academic Journal
We report on the synthesis of freestanding silicon spheres having sizes in the range of 3–10 nm. As-prepared luminescent silicon nanocrystals have H-passivated surface. Therefore, energy transfer from excitons confined in Si nanocrystals to oxygen molecules is found to be efficient. It is demonstrated that a termination of silicon nanocrystal H-passivated hydrophobic surface by lipids provides their water solubility. We found that this procedure preserves photosensitizing ability of silicon nanocrystals. Therefore, this material system can potentially be employed for a variety of biomedical applications.


Related Articles

  • Luminescence and photosensitization properties of ensembles of silicon nanocrystals in terms of an exciton migration model. Demin, V.; Konstantinova, E.; Kashkarov, P. // Journal of Experimental & Theoretical Physics;Nov2010, Vol. 111 Issue 5, p830 

    The relaxation processes that occur in ensembles of coupled silicon nanocrystals are described by a quantitative model that takes into account the energy transfer between them during exciton migration. This model is used to study the formation of singlet oxygen during the photoexcitation of...

  • Resonant energy transfer within a colloidal nanocrystal polymer host system. Kaufmann, Stefan; Stöferle, Thilo; Moll, Nikolaj; Mahrt, Rainer F.; Scherf, Ulli; Tsami, Argiri; Talapin, Dmitri V.; Murray, Christopher B. // Applied Physics Letters;2/12/2007, Vol. 90 Issue 7, p071108 

    The authors report on resonant energy transfer of nonequilibrium excitons in an amorphous polyfluorene donor CdSe/ZnS core-shell nanocrystal acceptor system. By time-resolved photoluminescence (PL) spectroscopy, they have investigated the PL decay behavior of the primarily excited polyfluorene...

  • Effect of the granule size in porous silicon on the photosensitization efficiency of molecular oxygen on the surface of silicon nanocrystals. Demin, V. A.; Konstantinova, E. A.; Gongal'skiĭ, M. B.; Kashkarov, P. K.; Radtsig, V. A. // Journal of Experimental & Theoretical Physics;Mar2009, Vol. 108 Issue 3, p477 

    Photoluminescence is used to study the effect of the granule size in porous silicon on the generation efficiency of the excited state of molecular oxygen (1O2) on the surface of silicon nanocrystals. The generation efficiency is found to increase as the granule size becomes smaller than 100 nm,...

  • Silicon nanocrystal-based photosensor on low-temperature polycrystalline-silicon panels. Chiang, Wen-Jen; Chen, Chih-Yang; Lin, Chrong-Jung; King, Ya-Chin; Cho, An-Thung; Peng, Chia-Tian; Chao, Chih-Wei; Lin, Kun-Chih; Gan, Feng-Yuan // Applied Physics Letters;7/30/2007, Vol. 91 Issue 5, p051120 

    A photodetector, comprising a layer of silicon nanocrystals that is sandwiched between two electrodes, is proposed and demonstrated in a photosensing application on low-temperature polysilicon panels. Laser annealing of silicon-rich oxide films can form nanocrystals that respond optimally to a...

  • Efficient energy transfer in layered hybrid organic/inorganic nanocomposites: A dual function of semiconductor nanocrystals. Lutich, Andrey A.; Pöschl, Andreas; Guoxin Jiang; Stefani, Fernando D.; Susha, Andrei S.; Rogach, Andrey L.; Feldmann, Jochen // Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p083109 

    The efficiency of energy transfer in hybrid organic/inorganic nanocomposites based on conjugated polymers and semiconductor nanocrystals is strongly dependent on both the energy transfer rate and the rate of the nonradiative recombination of the polymer. We demonstrate that the polymer...

  • Photoinduced relaxation processes in self-assembling complexes from CdSe/ZnS water-soluble nanocrystals and cationic porphyrins. Sagun, E.; Knyukshto, V.; Ivashin, N.; Shchupak, E.; Zhavnerko, G.; Karatai, N.; Agabekov, V. // Optics & Spectroscopy;Aug2012, Vol. 113 Issue 2, p165 

    Particular features and quenching mechanisms of exciton luminescence of water-soluble nanocomposites that are formed as a result of the interaction of surface charged semiconductor quantum dots (QDs) CdSe/ZnS ( d = 2.8 nm) and cationic porphyrins (HTMPyrP and ZnTMPyrP) have been studied...

  • Time-resolved energy transfer from single chloride-terminated nanocrystals to graphene. Ajayi, O. A.; Anderson, N. C.; Cotlet, M.; Petrone, N.; Gu, T.; Wolcott, A.; Gesuele, F.; Hone, J.; Owen, J. S.; Wong, C. W. // Applied Physics Letters;4/28/2014, Vol. 104 Issue 17, p1 

    We examine the time-resolved resonance energy transfer of excitons from single n-butyl aminebound, chloride-terminated nanocrystals to two-dimensional graphene through time-correlated single photon counting. The radiative biexponential lifetime kinetics and blinking statistics of the individual...

  • Resonant energy transfer of triplet excitons from pentacene to PbSe nanocrystals. Tabachnyk, Maxim; Ehrler, Bruno; Gélinas, Simon; Böhm, Marcus L.; Walker, Brian J.; Musselman, Kevin P.; Greenham, Neil C.; Friend, Richard H.; Rao, Akshay // Nature Materials;Nov2014, Vol. 13 Issue 11, p1033 

    The efficient transfer of energy between organic and inorganic semiconductors is a widely sought after property, but has so far been limited to the transfer of spin-singlet excitons. Here we report efficient resonant-energy transfer of molecular spin-triplet excitons from organic semiconductors...

  • Photosensitized generation of singlet oxygen in powders and aqueous suspensions of silicon nanocrystals. Ryabchikov, Yu.; Belogorokhov, I.; Gongalskii, M.; Osminkina, L.; Timoshenko, V. // Semiconductors;Aug2011, Vol. 45 Issue 8, p1059 

    The photoluminescence spectra and kinetics in powders and aqueous suspensions produced from porous silicon layers are studied. The systematic features of photosensitized generation of singlet oxygen by silicon nanocrystals in the samples are established. The dependence of the efficiency of...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics