Photochemically and electrochemically triggered Au nanoparticles "sponges"

Dora Balogh, Ran Tel-Vered, Ronit Freeman, Itamar Willner*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

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.

Original languageEnglish
Pages (from-to)6533-6536
Number of pages4
JournalJournal of the American Chemical Society
Volume133
Issue number17
DOIs
StatePublished - 4 May 2011

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