Abstract
Novel light-responsive nanoparticles were synthesized by decorating the surfaces of gold and silver nanoparticles with a nitrospiropyran molecular photoswitch. Upon exposure to UV light in nonpolar solvents, these nanoparticles self-assembled to afford spherical aggregates, which disassembled rapidly when the UV stimulus was turned off. The sizes of these aggregates depended on the nanoparticle concentration, and their lifetimes could be controlled by adjusting the surface concentration of nitrospiropyran on the nanoparticles. The conformational flexibility of nitrospiropyran, which was altered by modifying the structure of the background ligand, had a profound impact on the self-assembly process. By coating the nanoparticles with a spiropyran lacking the nitro group, a conceptually different self-assembly system, relying on a reversible proton transfer, was realized. The resulting particles spontaneously (in the dark) assembled into aggregates that could be readily disassembled upon exposure to blue light.
| Original language | English |
|---|---|
| Pages (from-to) | 19280-19286 |
| Number of pages | 7 |
| Journal | Nanoscale |
| Volume | 8 |
| Issue number | 46 |
| DOIs | |
| Publication status | Published - Dec 14 2016 |
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ASJC Scopus subject areas
- Materials Science(all)
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Controlling the lifetimes of dynamic nanoparticle aggregates by spiropyran functionalization. / Kundu, Pintu K.; Das, Sanjib; Ahrens, Johannes; Klajn, Rafal.
In: Nanoscale, Vol. 8, No. 46, 14.12.2016, p. 19280-19286.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Controlling the lifetimes of dynamic nanoparticle aggregates by spiropyran functionalization
AU - Kundu, Pintu K.
AU - Das, Sanjib
AU - Ahrens, Johannes
AU - Klajn, Rafal
PY - 2016/12/14
Y1 - 2016/12/14
N2 - Novel light-responsive nanoparticles were synthesized by decorating the surfaces of gold and silver nanoparticles with a nitrospiropyran molecular photoswitch. Upon exposure to UV light in nonpolar solvents, these nanoparticles self-assembled to afford spherical aggregates, which disassembled rapidly when the UV stimulus was turned off. The sizes of these aggregates depended on the nanoparticle concentration, and their lifetimes could be controlled by adjusting the surface concentration of nitrospiropyran on the nanoparticles. The conformational flexibility of nitrospiropyran, which was altered by modifying the structure of the background ligand, had a profound impact on the self-assembly process. By coating the nanoparticles with a spiropyran lacking the nitro group, a conceptually different self-assembly system, relying on a reversible proton transfer, was realized. The resulting particles spontaneously (in the dark) assembled into aggregates that could be readily disassembled upon exposure to blue light.
AB - Novel light-responsive nanoparticles were synthesized by decorating the surfaces of gold and silver nanoparticles with a nitrospiropyran molecular photoswitch. Upon exposure to UV light in nonpolar solvents, these nanoparticles self-assembled to afford spherical aggregates, which disassembled rapidly when the UV stimulus was turned off. The sizes of these aggregates depended on the nanoparticle concentration, and their lifetimes could be controlled by adjusting the surface concentration of nitrospiropyran on the nanoparticles. The conformational flexibility of nitrospiropyran, which was altered by modifying the structure of the background ligand, had a profound impact on the self-assembly process. By coating the nanoparticles with a spiropyran lacking the nitro group, a conceptually different self-assembly system, relying on a reversible proton transfer, was realized. The resulting particles spontaneously (in the dark) assembled into aggregates that could be readily disassembled upon exposure to blue light.
UR - http://www.scopus.com/inward/record.url?scp=84998773563&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84998773563&partnerID=8YFLogxK
U2 - 10.1039/c6nr05959g
DO - 10.1039/c6nr05959g
M3 - Article
AN - SCOPUS:84998773563
VL - 8
SP - 19280
EP - 19286
JO - Nanoscale
JF - Nanoscale
SN - 2040-3364
IS - 46
ER -