Heteroatom-doped hydrogenated amorphous carbons, a-C:H:X

Raman spectroscopy of hydrogenated amorphous carbons

We present a comprehensive multiwavelength Raman investigation of a variety of hydrogenated amorphous carbons a-C:H , ranging from polymeric a-C:H to diamond-like a-C:H and ta-C:H, which allows us to derive values for their bonding, density, band gap, hydrogen content, and mechanical properties. The Raman spectra of a-C:Hs show two different trends. In one case, the G peak width increases with ...

Capacitive Deionization using Biomass-based Microporous Salt-Templated Heteroatom-Doped Carbons.

Invited for this month's cover are the groups of Tim-Patrick Fellinger (MPI Potsdam) and Volker Presser (INM Saarbrücken and Saarland University). The image shows the dynamic process of ion electrosorption: anions are attracted and cations repelled from electrically charged electrodes based on carbons with heteroatoms. This process of capacitive deionization is particularly attractive for facil...

Highly porous S-doped carbons

Porous sulphur-doped carbons have been prepared by using polythiophene (PTh) as carbon precursor and KOH as activating agent. The activation process was carried out under several operating conditions, i. e. a KOH/PTh weight ratio of 2 or 4, and reaction temperatures in the 600-850 oC range. The porous carbons thus obtained exhibit very large apparent surface areas and high pore volumes of up to...

Conduction mechanisms in doped mixed-phase hydrogenated amorphous/nanocrystalline silicon thin films

Electronic structure and bonding properties of Si-doped hydrogenated amorphous carbon films

This work investigates the C K-edge x-ray absorption near-edge structure (XANES), valence-band photoelectron spectroscopy (PES), and Fourier transform infrared (FTIR) spectra of Si-doped hydrogenated amorphous carbon films. The C K-edge XANES and valence-band PES spectra indicate that the sp2 /sp3 population ratio decreases as the amount of tetramethylsilane vapor precursor increases during dep...