23 research outputs found
STING activation in TET2-mutated hematopoietic stem/progenitor cells contributes to the increased self-renewal and neoplastic transformation
Prevalence of crt and mdr-1 mutations in Plasmodium falciparum isolates from Grande Comore island after withdrawal of chloroquine
An empirical study on the long-term correlation between international trade and inflow of Foreign Direct Investment based on Cointegration Theory: Evidence from China
Self-Organization of Plasmonic and Excitonic Nanoparticles into Resonant Chiral Supraparticle Assemblies
Chiral nanostructures exhibit strong
coupling to the spin angular momentum of incident photons. The integration
of metal nanostructures with semiconductor nanoparticles (NPs) to
form hybrid plasmon–exciton nanoscale assemblies can potentially
lead to plasmon-induced optical activity and unusual chiroptical properties
of plasmon–exciton states. Here we investigate such effects
in supraparticles (SPs) spontaneously formed from gold nanorods (NRs)
and chiral CdTe NPs. The geometry of this new type of self-limited
nanoscale superstructures depends on the molar ratio between NRs
and NPs. NR dimers surrounded by CdTe NPs were obtained for the ratio
NR/NP = 1:15, whereas increasing the NP content to a ratio of NR/NP
= 1:180 leads to single NRs in a shell of NPs. The SPs based on NR
dimers exhibit strong optical rotatory activity associated in large
part with their twisted scissor-like geometry. The preference for
a specific nanoscale enantiomer is attributed to the chiral interactions
between CdTe NP in the shell. The SPs based on single NRs also yield
surprising chiroptical activity at the frequency of the longitudinal
mode of NRs. Numerical simulations reveal that the origin of this
chiroptical band is the cross talk between the longitudinal and the
transverse plasmon modes, which makes both of them coupled with the
NP excitonic state. The chiral SP NR–NP assemblies combine
the optical properties of excitons and plasmons that are essential
for chiral sensing, chiroptical memory, and chiral catalysis