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Download fileOptical Trapping of Nanocrystals at Oil/Water Interfaces: Implications for Photocatalysis
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posted on 2021-10-14, 14:43 authored by Yasuyuki Tsuboi, Shota Naka, Daiki Yamanishi, Tatsuya Nagai, Ken-ichi Yuyama, Tatsuya Shoji, Bunsho Ohtani, Mamoru Tamura, Takuya Iida, Tatsuya Kameyama, Tsukasa TorimotoOptical
trapping of inorganic nanocrystals at oil/water interfaces
was investigated under a loose focus condition. The target nanocrystals
were octahedral gold nanoparticles (OGPs, 70 nm in size), rice-shaped
(10 nm × 20 nm) ZnS-AgInS2 (ZAIS) nanoparticles, and
octahedral titania (TiO2) nanoparticles (OTPs, 100 nm).
While we were unable to trap these nanoparticles in homogeneous liquids
(n-hexane or water), they were successfully trapped
at an oil/water interface. We also investigated trapping for a binary
system at an interface, where OGPs and ZAIS nanoparticles were dispersed
in water (lower layer) and n-hexane (upper layer),
respectively. We observed the formation of a complex (hybrid) of an
OGP and ZAIS particle trapped at the oil/water interface. Interestingly,
the complex particle kept rotating during trapping even under irradiation
of linearly polarized light. This phenomenon suggested the spontaneous
breakdown of rotational symmetry in the optically coupled nanoparticles.
This interfacial trapping technique was applied to a photocatalytic
reaction. We observed the generation of Au nanoparticles from OTPs
trapped at an interface under UV light irradiation. Liquid/liquid
interfaces can strongly assist optical trapping and induce characteristic
chemical behavior.
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loose focus conditionlinearly polarized lighthomogeneous liquids (<interfacial trapping techniquesize ), rice100 nm ).optically coupled nanoparticlesphotocatalysis optical trappinguv light irradiationoctahedral gold nanoparticlesalso investigated trapping2 </ subzais particle trappedoptical trappingtrapping evenoctahedral titanian </70 nmsuccessfully trappedwater ),zais nanoparticlesau nanoparticlesspontaneous breakdownrotational symmetryphotocatalytic reactionphenomenon suggestedlower layerbinary system>- hexane