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.

Progress in the use of Raman spectroscopy to characterize graphene samples for the number of graphene layers and doping level they contain is briefly reviewed. Comparisons to prior studies on graphites and carbon nanotubes are used for inspiration to define future promising directions for Raman spectroscopy research on few layer graphenes.

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.

We theoretically and experimentally demonstrate that carbon self-doping could induce intrinsic electronic and band structure change of g-C(3)N(4)via the formation of delocalized big π bonds to increase visible light absorption and electrical conductivity as well as surface area and thus enhance both photooxidation and photoreduction activities.

nowadays, doping is an intricate dilemma for athletes. wrestling is the domestic, national and popular sport in iran. meanwhile, the prevalence of drug abuse in wrestling is high due to its power-demanding nature. so, we decided to evaluate the knowledge of club wrestlers of tehran about doping and their estimates of current prevalence in the country. in a cross sectional study, 426 wrestlers w...

Surface charge transfer is presented as an effective doping technique for III−V nanostructures. We generalize that the technique is applicable to nanoscale semiconductors in the limit where carriers are quantum confined. As a proof-of-concept, potassium surface charge transfer doping is carried out for one-dimensional (1D) and two-dimensional (2D) InAs on Si/SiO2 substrates. Experiments and sim...

Boron nitride nanotubes (BNNTs) [ 1,2 ] and boron nitride nanosheets (BNNSs) [ 3 ] have gained increasing attention for their structural similarity to carbon nanotubes (CNTs) and graphene, respectively. These BN nanostructures are wide-bandgap materials ( ∼ 6 eV), and their electronic properties are different from those of CNTs and graphene. In addition, BNNTs and BNNSs offer intriguing propert...