Angewandte Chemie International Edition · 2012 · 70 citations · 39 references
Natural SciencesChemistryMaterials ScienceNanomaterialsNanotechnologyOptical MaterialsInfrared Optical MaterialsInfrared SpectroscopyInorganic NanoparticlesLanthanide ChemistryLuminescent MaterialsNear-infrared SpectroscopyGold Nanoparticle SynthesisGold NanostructuresGold Surface FunctionalizationLanthanide-doped NanoparticlesLuminescent NanomaterialsNear-infrared Emission
A pH indicator: Near-infrared emitting lanthanide-functionalized gold nanoparticles have been prepared through self-assembly at the gold surface between a ytterbium(III)–cyclen complex and xylenol orange (see picture). Excitation of the xylenol orange unit with visible light, up to 600 nm, results in the sensitization of the YbIII-centered near-infrared emission that can be reversibly switched “on–off” as a function of the pH value.
39