QD-"Onion"-Multicode silica nanospheres with remarkable stability as pH sensorsElectronic supplementary information (ESI) available. See DOI: 10.1039/c1jm13125g

We present a flexible reverse microemulsion method using hydrophobic QDs for multiplexed encoded nanobeads encapsulating layers of different coloured quantum dots, called QD-"Onion"-Multicode bead (QOM). This novel system has monodisperse, photostable, and excellent luminescence properties...

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Bibliographic Details
Main Authors Serrano, Iván Castelló, Ma, Qiang, Palomares, Emilio
Format Journal Article
LanguageEnglish
Published 01.11.2011
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Summary:We present a flexible reverse microemulsion method using hydrophobic QDs for multiplexed encoded nanobeads encapsulating layers of different coloured quantum dots, called QD-"Onion"-Multicode bead (QOM). This novel system has monodisperse, photostable, and excellent luminescence properties that are stable at different pH values. The protection that the silica layers confer to the QDs allows them to be used as a ratiometric pH sensor by measuring the ratio of PL intensity of QDs from the different layers. Quantum-"Onion" Multicode nanospheres (QOM) encapsulating multi-QDs/SiO 2 layers are presented herein. The silica matrix used play an important role in making them water-soluble and protecting them from ubiquitous quenching mechanisms, at least in the pH range useful for biological applications (between pH 4 and pH 9).
Bibliography:10.1039/c1jm13125g
Electronic supplementary information (ESI) available. See DOI
ISSN:0959-9428
1364-5501
DOI:10.1039/c1jm13125g