Facet-dependent antibacterial activity of Au nanocrystals

Sinter Resistance and Activity Enhancement via a Facet-Dependent Metal–Support Interaction of Pd/ZnO Catalysts in CO Oxidation

“…Metal–support interaction (MSI) plays a crucial role for supported catalysts, which not only affects the catalytic performance but also determines the stability of nanoparticles (NPs). − The stability and sinter resistance of supported metal catalysts can be improved by designing the interface between NPs and the supports. − In addition, the heterogeneous catalytic reaction is mainly carried out on the surface of the catalyst, and the surface atomic arrangement of the support directly relates to the local environment of the metal NPs. It causes the different dynamic behaviors under the reaction gas and temperature, thereby affecting its catalytic reactivity. − And the surface atomic arrangement of the support is determined by the exposed crystal planes. , It is reported that the MSI can be regulated by tailoring the support morphology to exposed different crystal planes, exhibiting different crystal plane effects. , For instance, in situ sintering experiments of Au/TiO 2 found that the Au NPs are more stable on the anatase TiO 2 {001} surface than the {101} surface, on which Au NPs sinter into large particles through both the Ostwald ripening (OR) and particle migration coalescence (PMC) mechanisms . For the CO oxidation over an α-Fe 2 O 3 -supported Au catalyst, Fe 2 O 3 nanorods could stabilize the highly dispersed Au NPs and avoid the sintering behavior during the reaction compared with Fe 2 O 3 nanospheres, which contributes to the higher activity and stability in CO oxidation .…”

“…8−10 And the surface atomic arrangement of the support is determined by the exposed crystal planes. 11,12 It is reported that the MSI can be regulated by tailoring the support morphology to exposed different crystal planes, exhibiting different crystal plane effects. 13,14 For instance, in situ sintering experiments of Au/TiO 2 found that the Au NPs are more stable on the anatase TiO 2 {001} surface than the {101} surface, on which Au NPs sinter into large particles through both the Ostwald ripening (OR) and particle migration coalescence (PMC) mechanisms.…”

Nanobiotics against antimicrobial resistance: harnessing the power of nanoscale materials and technologies

“…Gold NPs (AuNPs) exert bactericidal effects by accumulating on the cell surface credited to heavy electrostatic forces accompanied by cytoplasmic leakage and cell death [71]. Au nanocrystals display facet-dependent antibacterial activities-bacterial membrane damage, inhibition of cellular enzymatic activity, and energy metabolism [72]. QDs are metallic in nature but contain a core of semiconductor materials like Cd or Zn.…”

Antibacterial metal nanoclusters

“…Among the antibacterial nanomaterials, metal nanoclusters (NCs), the ultrasmall aggregates composed of a few to several hundred metal atoms with well-defined molecular structures [ 20 ], have attracted much attention in antibacterial application. The inherent advantages in structures (such as large surface area, precise size, morphology control, ease of surface modification) and physiochemical properties (such as unique optical, electromagnetic, and catalytic properties) enable metal NCs with precisely tunable antibacterial activity [ 7 , 19 ]. For example, conventional AuNPs are inert for bacteria, while the potent antibacterial activity is emerged once decreasing their size to the nanocluster (NC) dimension (≤ 2 nm) [ 24 ].…”