Cu-chelated InP/ZnSe/ZnS QDs as PET/fluorescence dual-modal probe for tumor imaging.

Positron emission tomography (PET)/fluorescence dual-modal imaging combines deep penetration and high resolution, making it a promising approach for tumor diagnostics. Semiconductor nanocrystals, known as quantum dots (QDs), have garnered significant attention for fluorescence imaging owing to their tunable emission wavelength, high quantum yield, and excellent photostability. Among these QDs, heavy metal-free InP-based QDs have emerged as a promising candidate, addressing concerns regarding heavy metal-related toxicity.

Controlling photochromism between fluoroalkyl end-capped oligomer/polyaniline and N,N'-diphenyl-1,4-phenylenediamine nanocomposites induced by UV-light-responsive titanium oxide nanoparticles.

Colloidal stable fluoroalkyl end-capped 2-(methacryloyloxy)ethanesulfonic acid oligomer [R(F)-(MES)(n)-R(F)]/polyaniline[PAn]/TiO(2) nanocomposites and R(F)-(MES)(n)-R(F)/An-dimer (An-dimer: N,N'-diphenyl-1,4-phenylenediamine)/TiO(2) nanocomposites were prepared by the interactions of TiO(2) nanoparticles with R(F)-(MES)(n)-R(F)/PAn nanocomposites or R(F)-(MES)(n)-R(F)/An-dimer nanocomposites, which were prepared by the composite reaction of R(F)-(MES)(n)-R(F) oligomer with PAn or An-dimer. These two types of fluorinated TiO(2) nanocomposites can exhibit quite different photochromic behaviors: R(F)-(MES)(n)-R(F)/PAn/TiO(2) nanocomposites can exhibit a reversible wavelength change for polaron absorptions around 760-820 nm by alternation of UV irradiation and storage in the dark; in contrast, R(F)-(MES)(n)-R(F)/An-dimer/TiO(2) nanocomposites can exhibit a reversible color change from blue to colorless (a reversible absorbance change) by the similar treatment.