Twinned-Au-tip-induced growth of plasmonic Au–Cu Janus nanojellyfish in upconversion luminescence enhancement

Plasmonic Au–Cu nanostructures: Synthesis and applications

“…The protocol can be trivially extended to various shapes of Au nanostructures as cores, such as Au nanobipyramids, suggesting the generality of the site-selective overgrowth method ( Figures 3A–C ). Similarly, our group designed a new jellyfish-like Au–Cu Janus nanostructure ( Figure 3D ) ( Mi et al, 2022 ). A twin defect and stacking fault were found to exist at the twinned Au nanotips, which led to Cu atoms being deposited on the twinned nanotip.…”

“…(C) Elemental maps and HAADF-STEM image of the Au NBP–Cu heterostructure. (D) HAADF-STEM image and SEM image of Au–Cu Janus nanojellyfish ( Mi et al, 2022 ). (E) TEM images of Au–Cu heterodimers ( Zhu et al, 2020 ).…”

“…The reason was explained by the enhancement of the local electromagnetic field intensity. Recently, Au–Cu nanostructures have been employed to enhance the luminescence of Yb 3+ /Er 3+ -doped nanoparticles ( Mi et al, 2022 ). The plasmonic Au–Cu Janus nanojellyfish showed two LSPR peaks, which coupled the emission and excitation of the light wavelength of the Yb 3+ /Er 3+ -doped nanoparticles.…”

“…Insets in (C) show extinction spectra of Au 1 Cu 3 NR samples s ( Van et al, 2022 ). (D) Enhancement factors of emission of Yb 3+ /Er 3+ -doped nanoparticles coupled with a Au–Cu Janus nanostructure ( Mi et al, 2022 ).…”

Double local electromagnetic fields collaboratively enhanced triplet–triplet annihilation upconversion for efficient photocatalysis

“…[25][26][27] As a near-field enhancement technique, LSPR can boost the upconversion intensity by increasing the light absorption or improving the radiative decay rate when the resonance band is spectrally overlapped with the photoexcitation or fluorescence wavelength. [28][29][30][31] Since both the PBG and LSPR effects can enhance the upconversion emission by enlarging the local electromagnetic field, the combination of both is expected to cooperatively improve the intensity of the local electromagnetic field for high upconversion quantum efficiency. Although the coupling of the PBG and LSPR effects also has been researched to result in a remarkable increase in the upconversion emission of rare-earth upconversion materials, [32][33][34] the enhanced upconversion emission intensity is far from real applications due to its low intrinsic quantum efficiency.…”