Modulating luminescence and assembled shapes of ultrasmall Au nanoparticles towards hierarchical information encryption

Abstract

Because of their intriguing luminescence performances, ultrasmall Au nanoparticles (AuNPs) and their assemblies hold great potential in diverse applications, including information security. However, modulating luminescence and assembled shape of ultrasmall...

Controlling NIR-II emitting gold organic/inorganic nanohybrids with tunable morphology and surface PEG density for dynamic visualization of vascular dysfunction

“…These results indicated that the PEG chains of 4C AuNHs were in the dense brush conguration, while the PEG chains of S 4 AuNHs were in the brush conguration according to the ratio [G]/[G*] results (Table 1), which reected the packed PEG conguration ( 42,43 The different PEG congurations could be attributed to the different cross-linking abilities of the thiol ligands: S 4 had a powerful cross-linking ability and could enable the template Pluronic F127 to retain the spherical structure with the brush conguration; in contrast, 4C had less cross-linking ability and the template became deformed, rearranged, and reassembled into the linear structure with the dense brush conguration due to depletion interactions during dialysis against water. 44,45 Due to the different PEG congurations formed on the surface, the two AuNHs presented distinct shielding abilities against protein adsorption (Fig. 1g).…”

In situpost-synthesis of luminescent Lewis acid–base adducts

“…Zhou et al prepared Au nanoassemblies with the necklace-like and spherical nanoarchitectures featuring the tunable colors of the amphiphilic block copolymer-assisted self-assembly via in situ synthesis. 54 The encrypted information could be decrypted stepwise by regulating the wavelength of excitation light.…”

Biological Interaction and Imaging of Ultrasmall Gold Nanoparticles

“…As a result of the sharp size shrinking, the continuous energy levels of AuNPs become discrete [ 7 , 8 ], resulting in distinct optical and electronic properties. After systematical regulation of both the core and ligand layers of the ultrasmall AuNPs, the intrinsic excitation and emission wavelengths of AuNPs can be facilely tuned from visible region to the second near–infrared window (NIR-II, 1000–1700 nm) [ 9 , 10 ], facilitating the bioimaging investigation at both cellular and in vivo levels. Besides, the ultrasmall size endows the AuNPs with the characteristics of small molecules, while maintain the properties of inorganic nanoparticles with modifiable ligand layers towards multifunctional chemical modification [ 11 , 12 ].…”