The electrochemical CO2 reduction reaction (CO2RR) is a promising approach for converting fossil fuel emissions into environmentally sustainable chemicals and fuels. The ability to control the surface structure of CO2RR nanocatalysts provides an opportunity to tune product selectivity. Bimetallic gold–copper catalysts have been identified as emerging electrocatalyst candidates, but Cu incorporation typically lowers product selectivity compared with pure Au. Here we show sustained CO selectivity and activity up to 49% Cu content in small (<2 nm), thiol-capped Au/Cu nanoparticles (NPs). Bimetallic NPs containing 49% Cu selectivity converted CO2 into CO with 100 ± 6% CO Faradaic efficiency and average mass activity of ∼500 mA/mg during a 12 h electrolysis experiment at −0.8 V vs RHE. Au/Cu NPs synthesized without thiol ligands selectively produced H2, whereas larger (>10 nm), thermally dethiolated Au/Cu NPs produced a wider product distribution including H2, CO, and C2H4. Density functional theory (DFT) modeling of CO2RR and H2 evolution at realistic, thiol-capped Au/Cu NP structures indicated that copper–thiol surface structures sustained CO selectivity by stabilizing key *CO intermediates while making *H binding less favorable. Calculations also predicted that removing a significant fraction of the thiol ligands would increase *CO binding strength such that desorption of CO product molecules could become the most thermodynamically challenging step. This result, coupled with increased *H stability on dethiolated nanoclusters, points to decreased CO2RR selectivity for small, ligand-free catalysts, which is in line with experimental observations from our group and others. Our results demonstrate that thiol-ligand surface structures can sustain the CO selectivity of bimetallic Au/Cu NPs and reduce precious metal requirements for CO2RR.

Photoactivatable fluorophores have been widely used for tracking molecular and cellular dynamics with subdiffraction resolution.

The Adenomatoid Odontogenic Tumor presents in low frequency. It is originated from epithelial rests, specifically from the dental lamina, and shows similar characteristics to a wide variety of pathologies. Is a benign non-invasive lesion that can be manage by conservative treatment. Thus, is important to recognize and differentiate it from other pathologies that required more aggressive surgical treatment. The objective of the present article is to report a case of an Adenomatoid Odontogenic Tumor along with its common features.

The structural heterogeneity in mixed SWCNT samples results in extensive spectral complexity that can hamper a range of basic and applied research efforts. One approach to solving this problem is post-growth sorting, which unfortunately involves well known challenges. Here we report a photochemical strategy for spectral tailoring that uses monochromatic near-infrared (NIR) irradiation to selectively alter semiconducting (n,m) species based on their distinct and characteristic E11 optical transitions. This process does not physically isolate the targeted species, but it allows optical properties of the mixture to be modified without the need for physical separations. Our method achieves selective fluorescence quenching in aqueous dispersions of SWCNTs through irradiation of E11 transitions by NIR diode lasers in the presence of dissolved oxygen. Fluorescence emission from SWCNT species with transitions near the excitation wavelength is significantly and permanently suppressed, while the corresponding E11 absorptions are bleached and Raman D bands intensify. Results will be presented for several different oxygen headspace pressures and for wavelength-dependent irradiation data, which suggest a threshold consistent with the involvement of singlet O2. The method of near-IR photochemical tailoring may be useful for controlling SWCNT emission spectra in applications such as spectral bar-coding and strain sensing.

Chemical functionalization of the sidewalls of single-wall carbon nanotubes remains a topic of current interest because it can modify and enhance nanotube optical properties. These modifications can shift SWCNT structure-specific optical transitions further into the near-infrared, which may prove useful for applications in bio-imaging or quantum information processing. Here we present a study on the use of photoexcited hypochlorite ions as a reactant to efficiently produce sparse oxygen-containing defects in SWCNTs. Our studies highlight the formation of new secondary reaction products in the absence of dissolved oxygen. These results in combination with quantum computations provide insight into the structure of the new photoadducts. Additionally, we find that product spectra depend on pH of the reacting system, implying more than one reaction pathway. This finding is supported by measurements of the effects of radical quenchers on product properties. Our results provide improved understanding and control of an important class of nanotube functionalization reactions.