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  • Title: pH-dependent network formation of quantum dots and fluorescent quenching by Au nanoparticle embedding.
    Author: Sekiguchi S, Niikura K, Iyo N, Matsuo Y, Eguchi A, Nakabayashi T, Ohta N, Ijiro K.
    Journal: ACS Appl Mater Interfaces; 2011 Nov; 3(11):4169-73. PubMed ID: 21970588.
    Abstract:
    A simple approach to the creation of colloidal assemblies is in high demand for the development of functional devices. Here, we present the preparation of CdTe-QD (quantum dot) networks in as little as 1 day simply by pH modification without the use of oxidants. The QD network was tractable in water and casting from a droplet produced a porous networked film on both hydrophobic and hydrophilic solid substrates. Further, we found that citrate-protected gold nanoparticles (AuNPs, d = 5 nm) could be incorporated into the QD networks to afford a QD/Au composite network, and that the fluorescence from the QDs was largely decreased by the addition of a small proportion of AuNPs (QD:AuNP = 99.4:0.6), probably due to the efficient charge transfer through the network. These data indicate that our method is suitable for application to the creation of metal/QD hybrid materials that can be integrated into wet-based processes.
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