Key role of nitrogen in conductivity of carbon-nitrogen materials

Evaluation of Keratin–Cellulose Blend Fibers as Precursors for Carbon Fibers

“…This was lower than the electrical conductivity reported for soy hull-derived carbon (∼120 S/cm) but much higher than the carbon from plywood and particleboard (<0.3 S/cm), both pyrolyzed under similar conditions . The influence of nitrogen incorporated in the carbon structure on the bulk conductivity of the carbon material has been studied for many different systems. − However, the effect depends strongly on the underlying carbon matrix, the distribution and modification of the incorporated nitrogen, and the methods used to prepare those nitrogen-doped carbon scaffolds. Further, comparison with literature value was hampered due to the relatively porous morphology of the CFs derived from keratin-containing precursor fibers, as an increase in pores reduces the electrical conductivity of the carbon. , The formation of the pores or large voids in the keratin–cellulose-derived carbon, which were also observed in the mixed-polymer precursor fibers, is shown in the SEM images in Figure .…”

Insight into the rapid degradation of antibiotic rifampicin by W-doped O-bridged g-C3N4via the coupling effect of electron replenishment in the dark degradation stage and electrophilic attack in the photocatalytic stage: experiments and DFT simulation calculations

“…32 Thirdly, the vibration peaks of carbon and the nitrogen heterocyclic ring in WOCN y - x are weakened and deformed obviously, and two main absorption peaks were observed at 1620 cm −1 and 1400 cm −1 . The absorption peak at 1620 cm −1 is derived from the bending vibration of water molecules or CC or CN vibration, 51,52 whereas the absorption peak near 1400 cm −1 is assigned to CO or C–C. 45,53 It is also worth noting that the increase in milling time (0–6 h) has a negative effect on the vibration of the above bonding groups, because high-pressure milling causes more C to be replaced by W, while the presence of W–O groups inhibits the vibration of the triazine ring.…”

“…32 Thirdly, the vibration peaks of carbon and the nitrogen heterocyclic ring in WOCN y -x are weakened and deformed obviously, and two main absorption peaks were observed at 1620 cm −1 and 1400 cm −1 . The absorption peak at 1620 cm −1 is derived from the bending vibration of water molecules or C]C or C]N vibration, 51,52 whereas the absorption peak near 1400 cm −1 is assigned to C]O or C-C. 45,53 It is also worth noting that the increase in milling time (0-6 h) has a negative effect on the vibration of the above bonding groups, because high-pressure milling causes more C to be replaced by W, while the presence of W-O groups inhibits the vibration of the triazine ring. 45 When the ball milling time is extended to 8 h, the peaks at 1400 cm −1 and 1620 cm −1 of WOCN 8 -2 become wider and sharper, which is attributed to the more structural defects of the modied g-C 3 N 4 caused by prolonged ball milling, beneting the introduction of C and O. Fourthly, a new cyano group (-CN) peak appears near 2210 cm −1 in the WOCN y -x sample.…”