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  • Title: Spiropyran-modified gold nanoparticles: reversible size control of aggregates by UV and visible light irradiations.
    Author: Shiraishi Y, Shirakawa E, Tanaka K, Sakamoto H, Ichikawa S, Hirai T.
    Journal: ACS Appl Mater Interfaces; 2014 May 28; 6(10):7554-62. PubMed ID: 24746341.
    Abstract:
    UV or visible light irradiation of gold nanoparticles (AuNPs) modified with a thiol-terminated spiropyran dye promotes reversible aggregation or dispersion of AuNPs. This is facilitated by the electrostatic repulsion/attraction between the AuNPs controlled by the ring-opening/closing photoisomerization of the surface dyes. This photochemical method successfully produces aggregates of AuNPs with tunable sizes (20-340 nm) and narrow size distributions (standard deviation <34%) in a reversible manner. In addition, the formed aggregates, even when left in the dark condition, scarcely change their sizes because the stacking interaction between the ring-opened forms of surface dyes suppresses thermal reverse isomerization and maintains the attractive force between the AuNPs.
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