Abstract Charge states and lattice sites of Fe ions in virgin Mn-doped Al x Ga 1− N samples were investigated using 57 emission Mössbauer spectroscopy following radioactive Mn + ion implantation at ISOLDE, CERN. In the undoped N, 2+ on Al/Ga associated with nitrogen vacancies 3+ substitutional are identified. With doping, contribution is considerably reduced replaced instead by a corresponding ...

In this work, the influence of Cr and Mn impurity atoms on electronic structure magnetic properties 3C–SiC was analyzed by carrying out first-principles calculations using GGA + U method, Si vacancies co-doped system also considered. The results showed systems mono-doped with to be spin-polarized had total moments 3.05 5.00 μB, respectively. ferromagnetic state each various (Cr, Mn)-co-doped de...

Visible-light-responsive anatase TiO(2) platelets with dominant {001} facets were prepared via a facile nitridation reaction from a TiOF(2) precursor. The in situ co-doping of N and F in the anatase TiO(2) nanoparticles leads to drastically enhanced absorption and excellent water oxidation performance in the visible light region.

Monochiral single-walled carbon nanotubes have many potential uses, especially in the field of electronics and medical applications. Here we demonstrate a method to activate three types of Co/SiO(2) catalysts via sulfur-doping for the synthesis of tubes with a narrow chiral distribution around (9,8) chirality.

Article history: Available online 19 March 2009 PACS: 74.70. b 81.10. h 74.25. q 74.25.Ha 74.25.Jb

The magnetic properties of 1 nm thick in-plane anisotropic Co ultrathin film on ZnO(0001) were investigated through successive 500 eV nitrogen-ion sputtering. Magneto-optical Faraday effects were used to observe the evolution of the ion-irradiated sample in longitudinal and perpendicular magnetic fields. The ferromagnetic phase of the initial in-plane anisotropic fcc β-Co phase transformation t...

Carbon materials that are intrinsically co-doped with nitrogen and sulfur heteroatoms are synthesised by facile annealing of nitrile-functionalised thiazolium salts. Extremely high degrees of doping are achieved, especially for sulfur. The method further allows for direct tuning of the amounts of both N and S, establishing a new synthetic pathway in the emerging field of S-doped carbon materials.

N and S co-doped carbon quantum dots (N, S-CQDs) with high N- and S-doping level were synthesized by microwave solid-phase pyrolysis within 50 s. Owing to the dominant pyridinic N injection into the conjugated framework, both high enzyme mimics catalytic activity and photoluminescence quantum yield are achieved simultaneously.

Heteroatom-doped carbon quantum dots (CQD) were synthesized by 3 preparation methods: pyrolysis, microwave irradiation, hydrothermal synthesis. Their properties as electrocatalysts for the oxygen reduction reaction (ORR) in alkaline conditions studied linear sweep voltammetry. The best N-doped CQD obtained hydrothermally with an onset potential of 0.85 V vs RHE. Co-doping a second heteroatom, B...