title: Photochemically and electrochemically triggered Au nanoparticles "sponges".
abstract: Stimuli-triggered wettability of surfaces and controlled uptake and release of substrates by "smart" materials are essential for drug delivery and microfluidic control. A composite "sponge" consisting of bis-aniline-bridged Au nanoparticles (NPs), functionalized with photoisomerizable nitrospiropyran/nitromerocyanine that includes selective imprinted molecular recognition sites for N,N'-bis(3-sulfonatopropyl)-4,4'-bipyridinium (PVS) was electropolymerized on a Au electrode. The system is triggered by photonic and/or electrical signals to yield four different states exhibiting variable binding/release capacities for PVS and controlled wettability of the surface. The electrical/optical uptake and release of PVS to and from the Au NPs "sponge", respectively, is followed by CdSe/ZnS quantum dots, acting as an auxiliary photonic label.
authors.affiliation: The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
authors.forename: Dora
authors.initials: D
authors.lastname: Balogh
authors.forename: Ran
authors.initials: R
authors.lastname: Tel-Vered
authors.forename: Ronit
authors.initials: R
authors.lastname: Freeman
authors.forename: Itamar
authors.initials: I
authors.lastname: Willner
mesh_terms: D000476:Alkanesulfonates / Q000008:administration & dosage*; D000814:Aniline Compounds / Q000737:chemistry*; D003692:Delayed-Action Preparations / Q000737:chemistry*; D004563:Electrochemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry; D054802:Molecular Imprinting; D010777:Photochemistry; D045663:Quantum Dots; D014755:Viologens / Q000008:administration & dosage*; D017155:Wettability
chemical_list: D000476:Alkanesulfonates; D000814:Aniline Compounds; D003692:Delayed-Action Preparations; C553049:N,N'-bis(3-sulfonatopropyl)-4,4'-bipyridinium; D014755:Viologens; D006046:Gold; C023650:aniline