NDLI: A ceramic microreactor for the synthesis of water soluble CdS and CdS/ZnS nanocrystals with on-line optical characterization

Content Provider	Royal Society of Chemistry (RSC)
Author	Fuente, J. M. de Salinas, Iñigo Izquierdo, David Alonso-Chamarro, Julián Puyol, Mar Pedro, Sara Gómez-de
Copyright Year	2012
Abstract	In this paper, a computer controlled microreactor to synthesize water soluble CdS and CdS/ZnS nanocrystals with in situ monitoring of the reaction progress is developed. It is based on ceramic tapes and the Low-Temperature Co-fired Ceramics technology (LTCC). As well the microsystem set-up, the microreactor fluidic design has also been thoroughly optimized. The final device is based on a hydrodynamic focusing of the reagents followed by a three-dimensional micromixer. This generates monodispersed and stable CdS and core–shell CdS/ZnS nanocrystals of 4.5 and 4.2 nm, respectively, with reproducible optical properties in terms of fluorescence emission wavelengths, bandwidth, and quantum yields, which is a key requirement for their future analytical applications. The synthetic process is also controlled in real time with the integration of an optical detection system for absorbance and fluorescence measurements based on commercial miniaturized optical components. This makes possible the efficient managing of the hydrodynamic variables to obtain the desired colloidal suspension. As a result, a simple, economic, robust and portable microsystem for the well controlled synthesis of CdS and CdS/ZnS nanocrystals is presented. Moreover, the reaction takes place in aqueous medium, thus allowing the direct modular integration of this microreactor in specific analytical microsystems, which require the use of such quantum dots as labels.
Starting Page	1328
Ending Page	1335
Page Count	8
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	4
Issue Number	4
Journal	Nanoscale
DOI	10.1039/c2nr11525e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Fluorescence Microreactor Micromixer
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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