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Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions

We have prepared colloidal solutions of clusters composed from porous silicon nanoparticles in methanol, water and phosphate-buffered saline (PBS). Even if the size of the nanoclusters is between 60 and 500 nm, due to their highly porous “cauliflower”-like structure, the porous silicon nanoparticles...

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Autores principales: Herynková, Kateřina, Šlechta, Miroslav, Šimáková, Petra, Fučíková, Anna, Cibulka, Ondřej
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4991980/
https://www.ncbi.nlm.nih.gov/pubmed/27541815
http://dx.doi.org/10.1186/s11671-016-1593-4
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author Herynková, Kateřina
Šlechta, Miroslav
Šimáková, Petra
Fučíková, Anna
Cibulka, Ondřej
author_facet Herynková, Kateřina
Šlechta, Miroslav
Šimáková, Petra
Fučíková, Anna
Cibulka, Ondřej
author_sort Herynková, Kateřina
collection PubMed
description We have prepared colloidal solutions of clusters composed from porous silicon nanoparticles in methanol, water and phosphate-buffered saline (PBS). Even if the size of the nanoclusters is between 60 and 500 nm, due to their highly porous “cauliflower”-like structure, the porous silicon nanoparticles are composed of interconnected nanocrystals having around 2.5 nm in size and showing strong visible luminescence in the orange-red spectral region (centred at 600–700 nm). Hydrophilic behaviour and good solubility of the nanoclusters in water and water-based solutions were obtained by adding hydrogen peroxide into the etching solution during preparation and 16 min long after-bath in hydrogen peroxide. By simple filtration of the solutions with syringe filters, we have extracted smaller nanoclusters with sizes of approx. 60–70 nm; however, these nanoclusters in water and PBS solution (pH neutral) are prone to agglomeration, as was confirmed by zeta potential measurements. When the samples were left at ambient conditions for several weeks, the typical nanocluster size increased to approx. 330–400 nm and then remained stable. However, both freshly filtered and aged samples (with agglomerated porous silicon nanoparticles) of porous silicon in water and PBS solutions can be further used for biological studies or as luminescent markers in living cells.
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spelling pubmed-49919802016-09-07 Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions Herynková, Kateřina Šlechta, Miroslav Šimáková, Petra Fučíková, Anna Cibulka, Ondřej Nanoscale Res Lett Nano Express We have prepared colloidal solutions of clusters composed from porous silicon nanoparticles in methanol, water and phosphate-buffered saline (PBS). Even if the size of the nanoclusters is between 60 and 500 nm, due to their highly porous “cauliflower”-like structure, the porous silicon nanoparticles are composed of interconnected nanocrystals having around 2.5 nm in size and showing strong visible luminescence in the orange-red spectral region (centred at 600–700 nm). Hydrophilic behaviour and good solubility of the nanoclusters in water and water-based solutions were obtained by adding hydrogen peroxide into the etching solution during preparation and 16 min long after-bath in hydrogen peroxide. By simple filtration of the solutions with syringe filters, we have extracted smaller nanoclusters with sizes of approx. 60–70 nm; however, these nanoclusters in water and PBS solution (pH neutral) are prone to agglomeration, as was confirmed by zeta potential measurements. When the samples were left at ambient conditions for several weeks, the typical nanocluster size increased to approx. 330–400 nm and then remained stable. However, both freshly filtered and aged samples (with agglomerated porous silicon nanoparticles) of porous silicon in water and PBS solutions can be further used for biological studies or as luminescent markers in living cells. Springer US 2016-08-19 /pmc/articles/PMC4991980/ /pubmed/27541815 http://dx.doi.org/10.1186/s11671-016-1593-4 Text en © The Author(s). 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Nano Express
Herynková, Kateřina
Šlechta, Miroslav
Šimáková, Petra
Fučíková, Anna
Cibulka, Ondřej
Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions
title Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions
title_full Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions
title_fullStr Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions
title_full_unstemmed Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions
title_short Agglomeration of Luminescent Porous Silicon Nanoparticles in Colloidal Solutions
title_sort agglomeration of luminescent porous silicon nanoparticles in colloidal solutions
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4991980/
https://www.ncbi.nlm.nih.gov/pubmed/27541815
http://dx.doi.org/10.1186/s11671-016-1593-4
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