This photocatalytic conversion of carbon dioxide laboratory experiment is designed for an advanced undergraduate chemistry or chemical engineering majors laboratory course. It introduces the science of emerging sustainable energy technologies through hands-on experimentation. By photo-irradiating a glass flask containing water, catalyst, and carbon dioxide, students explore the potential of new...

Organic solar cells are flexible and inexpensive, and expected to have a wide range of applications. Many transparent organic solar cells have been reported and their success hinges on full transparency and high power conversion efficiency. Recently, carbon nanotubes and graphene, which meet these criteria, have been used in transparent conductive electrodes. However, their use in top electrode...

Experimental and theoretical techniques are used to investigate the impact of tin doping on the formation and the thermal stability of oxygenand carbon-related defects in electron-irradiated Czochralski silicon. The results verify previous reports that Sn doping reduces the formation of the VO defect and suppresses its conversion to the VO2 defect. Within experimental accuracy, a small delay in...

The study was done on how adsorption of carbon monoxide gas on the catalytic surface is affected by doping with boron and phosphorus in metallic nickel powder. The effect of doping was investigated using FTIR spectroscopy and compared to the spectra obtained from adsorption of carbon monoxide on pure nickel catalyst surface. An understanding of the results obtained from the nickel sample was al...

Nitrogen doping has been a powerful way to modify the properties of carbon materials ranging from activated carbon to graphene. Here we report on a solution chemistry approach to nitrogen-doped colloidal graphene quantum dots with well-defined structures. N-doping was demonstrated to significantly affect the properties of the quantum dots, including the emergence of size-dependent electrocataly...

We report on studies of the n-type doping dependence of the Raman response of double-wall carbon nanotubes (DWCNT). The G-line is found to be shifting upon doping. The direction of the shift depends on if the exciting laser light is in resonance with mainly inner or outer tubes. The RBM response upon doping shows that a charge transfer from the dopant happens predominantly to the outer tubes at...

Understanding the doping mechanism that involves substantial charge transfer between carbon nanotubes and chemical adsorbent is of critical importance for both basic scientific knowledge and nanodevice applications. Nevertheless, it is difficult to estimate the modification of electronic structures of the doped carbon nanotubes. Here we report measurements of electrochemical potentials of n-dop...

Introduction Recent advances in nanotechnology have heralded new processes for fabrication of nanomaterials having macroscopic dimensions. A solid-state process for producing macroscopic sheets made of carbon nanotubes has been reported in [1]. The technological promise of carbon nanotubes includes charge transport with minimal scattering, leading to expectations of large electrical conductivit...

We report a detailed experimental and theoretical study on the electronic and optical properties of highly boron-substituted (up to 15 at.%) single-wall carbon nanotubes. Core-level electron energy-loss spectroscopy reveals that the boron incorporates into the lattice structure of the tubes, transferring ,1/2 hole per boron atom into the carbon derived unoccupied density of states. The charge t...