TY - JOUR
T1 - Thermally induced variation in redox chemical bonding structures of single-walled carbon nanotubes exposed to hydrazine vapor
AU - Wang, Pen Cheng
AU - Liao, Yu Chun
AU - Lai, Yu Ling
AU - Lin, Ying Chang
AU - Su, Ching Yuan
AU - Tsai, Chuen Horng
AU - Hsu, Yao Jane
PY - 2012/4
Y1 - 2012/4
N2 - The effect of hydrazine (N 2H 4) vapor on the properties of single-walled carbon nanotube (SWCNT) networks was investigated by sheet resistance measurement, scanning electron microscopy, Raman spectroscopy, ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS). Our results show that, even after an auxiliary thermal desorption treatment at 80 °C, the n-doping effect on our SWCNTs caused by N 2H 4 vapor still persistently remained. Further analysis on the XPS data suggests that a reactive chemical species, nitrene (NH), generated during thermal decomposition of N 2H 4, could react with SWCNTs by cycloaddition to form cyclic nitrogen-containing aziridine structures on SWCNTs. Our results also show that the formed nitrogen-containing bonding structures were thermally metastable and could be significantly eliminated upon further annealing at 350 °C. Moreover, it was found that the N 2H 4 vapor treatment could introduce nitroso groups and carbonyl groups, but not carboxyl groups, to our pristine SWCNTs. The mild oxidation could be attributed to the HNO 2 and H 2O 2 produced from the reactions of NH and N 2H 4 with oxygen, respectively, when a N 2H 4 treatment was performed in air.
AB - The effect of hydrazine (N 2H 4) vapor on the properties of single-walled carbon nanotube (SWCNT) networks was investigated by sheet resistance measurement, scanning electron microscopy, Raman spectroscopy, ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS). Our results show that, even after an auxiliary thermal desorption treatment at 80 °C, the n-doping effect on our SWCNTs caused by N 2H 4 vapor still persistently remained. Further analysis on the XPS data suggests that a reactive chemical species, nitrene (NH), generated during thermal decomposition of N 2H 4, could react with SWCNTs by cycloaddition to form cyclic nitrogen-containing aziridine structures on SWCNTs. Our results also show that the formed nitrogen-containing bonding structures were thermally metastable and could be significantly eliminated upon further annealing at 350 °C. Moreover, it was found that the N 2H 4 vapor treatment could introduce nitroso groups and carbonyl groups, but not carboxyl groups, to our pristine SWCNTs. The mild oxidation could be attributed to the HNO 2 and H 2O 2 produced from the reactions of NH and N 2H 4 with oxygen, respectively, when a N 2H 4 treatment was performed in air.
UR - http://www.scopus.com/inward/record.url?scp=84855824950&partnerID=8YFLogxK
U2 - 10.1016/j.carbon.2011.12.003
DO - 10.1016/j.carbon.2011.12.003
M3 - 文章
AN - SCOPUS:84855824950
SN - 0008-6223
VL - 50
SP - 1650
EP - 1658
JO - Carbon
JF - Carbon
IS - 4
ER -