title: pH-dependent network formation of quantum dots and fluorescent quenching by Au nanoparticle embedding.
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.
authors.forename: Shota
authors.initials: S
authors.lastname: Sekiguchi
authors.forename: Kenichi
authors.initials: K
authors.lastname: Niikura
authors.forename: Naoki
authors.initials: N
authors.lastname: Iyo
authors.forename: Yasutaka
authors.initials: Y
authors.lastname: Matsuo
authors.forename: Asumi
authors.initials: A
authors.lastname: Eguchi
authors.forename: Takakazu
authors.initials: T
authors.lastname: Nakabayashi
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Ohta
authors.forename: Kuniharu
authors.initials: K
authors.lastname: Ijiro
mesh_terms: D031541:Fluorescence Resonance Energy Transfer / Q000295:instrumentation*; D006046:Gold / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D045663:Quantum Dots
chemical_list: D006046:Gold