期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 10, 页码 7554-7562出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5009002
关键词
gold nanoparticles; self-assembly; spiropyran; photoisomerization; aggregation
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [23360349]
- Grants-in-Aid for Scientific Research [23360349] Funding Source: KAKEN
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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