Gold nanoparticles for biocatalysis

Small but mighty: unlocking the catalytic power of individual iridium atoms on titanium oxide

“…A high-angle annular dark-field detector (HAADF) collects those electrons passing close to the atoms nucleus electrons, being scattered at much high angles (>50 mrad). These high-angle scattered electrons contain pure Z-contrast information from the sample and possess incoherent characteristics (Carter and Williams, 2016;Plascencia-Villa et al, 2020;Plascencia-Villa and Mendoza-Cruz, 2022).…”

Plasmonic photothermal activation of an organosilica shielded cold-adapted lipase co-immobilised with gold nanoparticles on silica particles

“… 21 A large variety of carriers for enzyme stabilisation have been explored; among many are gold nanoparticles. 22 For example, Gherardi et al have recently demonstrated that an α-amylase, immobilised on AuNPs, displays higher stability and efficiency than the soluble enzyme and applied the nanosystems produced to the cleaning of heritage textiles. 23 Breger et al , reporting on the immobilisation of a phosphotriesterase, demonstrated that the size of AuNP influences the activity of the immobilised enzyme.…”

Experimental High-Resolution Observation of the Truncated Double-Icosahedron Structure: A Stable Twinned Shell in Alloyed Au–Ag Core@Shell Nanoparticles

“…This complication is surpassed in Cs-corrected HAADF imaging, where the positions of individual atomic columns are effectively resolved. 49 The presence of TBs parallel to {111} facets of the core corresponds to a reconstructed Dh or truncated MTP, such as a TIh, in which the top layers of an Ih are removed. The regular Dh and Ih are closely related.…”

“…Herein, we present the unreported experimental observation of a truncated MTP structure in Au–Ag NPs. Aberration-corrected high-angle annular dark-field (HAADF) imaging enabled the determination of the structural features of the nanoalloy. − On the basis of the experimental images and supported by theoretical calculations, we proposed that the Au–Ag NPs adopted an alloyed core@shell doubly truncated double-icosahedron (T-dIh) structure so that a twinned Ag-rich shell is formed on a Au–Ag decahedral core.…”

“…The generated contrast along the superimposed direction can be difficult to interpret from conventional HRTEM images, as one can see in HRTEM simulations in Figure S6. This complication is surpassed in Cs-corrected HAADF imaging, where the positions of individual atomic columns are effectively resolved …”