Hard X-ray excited optical luminescence from protein-directed Au_∼20 clusters

Abstract

We investigated the luminescence properties of protein-directed Au∼20 clusters upon hard X-ray irradiation, demonstrating the further possible application toward nanomaterial based bio-imaging and diagnostics.

Roles of Heterojunction and Cu Vacancies in the Au@Cu2–xSe for the Enhancement of Electrochemical Nitrogen Reduction Performance

“…The observed peaks at 87.56 and 83.87 eV correspond to Au 0 . 42,60 After the aqueous and nonaqueous ENRR, the XPS analysis of Au@Cu 2−x Se revealed no significant changes in the Au 4f XPS results, indicating that the reduced state of Au was maintained even after the electrochemical reaction. This suggests the structural stability of Au@Cu 2−x Se during the ENRR process.…”

“…The Au 4f spectra (Figure 2b) can be deconvoluted into two peaks attributed to Au 4f 7/2 and Au 4f 5/2 , situated at 83.8 and 87.5 eV, respectively. 41,42 The prepared Au@Cu 2−x Se nanoparticles exhibited peaks at 931.7 and 951.6 eV corresponding to Cu 1+ and peaks at 933.5 and 953.3 eV related to Cu 2+ , along with satellite peaks at 942.9 and 961.9 eV in Cu 2p spectra (Cu 2p 3/2 and Cu 2p 1/2 ) (Figure 2c). 41,43,44 The Se 3d spectra in Figure 2d are deconvoluted into three peaks assigned to Se 3d 5/2 (53.8 eV), Se 3d 3/2 (54.9 eV), and SeO x (58.5 eV), respectively.…”

Red, green, and blue radio-luminescent polymer dots doped with heteroleptic tris-cyclometalated iridium complexes

“…9 We and other research groups have developed radioluminescent nanomaterials from inorganic and organic building blocks. [10][11][12][13][14] For instance, we previously reported ∼500 nm yellow emission from polymer dots (P-dots) by using hard X-ray irradiation at a 50-kVp tube voltage with a homoleptic tris-cyclometalated iridium complex. 15 However, the emission color and excitation radiation sources remain limited; thus, it is crucial to further develop these materials in terms of the emission color and radiation source variation.…”

Radioluminescence from polymer dots based on thermally activated delayed fluorescence

“…9 Previously, we investigated hard X-ray excited luminescence from nanomaterials such as polymer nanoparticles (P-dots) and nanoclusters as imaging probes in H 2 O. [10][11][12] We also attributed the long lifetime of photoluminescence as an important requirement for efficient scintillation, but such luminescence has been limited to nanomaterials containing heavy atoms such as gold and iridium. 10,11,13 We hypothesized that nano-probes containing TADF molecules would also work as scintillators for radiation (including hard X-ray and electron beams) in nanomaterials.…”

“…[10][11][12] We also attributed the long lifetime of photoluminescence as an important requirement for efficient scintillation, but such luminescence has been limited to nanomaterials containing heavy atoms such as gold and iridium. 10,11,13 We hypothesized that nano-probes containing TADF molecules would also work as scintillators for radiation (including hard X-ray and electron beams) in nanomaterials. In this study, we synthesized TADF molecule doped P-dots and characterized their emission properties, including hard X-ray and electron beam excited luminescence.…”