In this work, a nanoscale reduced graphene oxide-iron oxide nanoparticle (RGO-IONP) complex is noncovalently functionalized with polyethylene glycol (PEG), obtaining a RGO-IONP-PEG nanocomposite with excellent physiological stability, strong NIR optical absorbance, and superparamagnetic properties. Using this theranostic nanoprobe, in-vivo triple modal fluorescence, photoacoustic, and magnetic resonance imaging are carried out, uncovering high passive tumor targeting, which is further used for effective photothermal ablation of tumors in mice.
Colloidal
quantum dots (CQDs), which benefit from a size-tuned
bandgap, are a solution-processed material for infrared energy harvesting.
This characteristic enables the fabrication of solar cells that form
tandem devices with silicon. Unfortunately, in the case of CQDs having
diameters sufficiently large (>4 nm) so that the nanoparticles
absorb
light well beyond silicon’s bandgap, conventional ligand exchanges
fail. Here we report a strategy wherein short-chain carboxylates,
used as a steric hindrance controller, facilitate the ligand exchange
process on small-bandgap CQDs. We demonstrate that the net energy
barrier to replace original capping ligands with lead halide anions
is decreased when short carboxylates are involved. The approach produces
more complete ligand exchange that enables improved packing density
and monodispersity. This contributes to a 2-fold reduction in the
trap state density compared to the best previously reported exchange.
We demonstrate solar cells that achieve a record infrared photon-to-electron
conversion efficiency at the excitonic peak.
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