2024-03-29T14:00:13Z
https://soar-ir.repo.nii.ac.jp/oai
oai:soar-ir.repo.nii.ac.jp:00012330
2022-12-14T04:05:59Z
1221:1222
Quantitative characterization of acidic groups on acid-treated multi-walled carbon nanotubes using 1-aminopyrene as a fluorescent probe
Nishikiori, Hiromasa
Tanigaki, Taku
Endo, Morinobu
Fujii, Tsuneo
Acidic functional groups produced on the surface of acid-treated multi-walled carbon nanotubes (MWCNTs) were quantified by fluorescence measurements using 1-aminopyrene (1-AP) as an in situ probe molecule. The 1-AP cation-like bands were observed on the HNO3/H2SO4 mixture-treated MWCNT surfaces because the 1-AP molecule was tightly immobilized by the hydrogen bonding interaction between its amino group and the Bronsted-acidic groups on the MWCNT surface. The fluorescence measurement, allowed us to confirm the Langmuir-type adsorption of 1-AP on the functional groups of the MWCNTs, and estimate their amount of the functional groups and adsorption equilibrium constant. A longer acid treatment caused the chemical modification to generate higher amounts of the Bronsted-acidic functional groups and improve the adsorption ability on the MWCNT surface. About 2% of carbon in the MWCNTs was oxidized by the 24 h acid treatment. This value corresponded to 15-22% of carbon in the surface layer.
Article
CARBON. 66:560-566 (2014)
journal article
PERGAMON-ELSEVIER SCIENCE LTD
2014-01
application/pdf
CARBON
66
560
566
0008-6223
AA00598943
https://soar-ir.repo.nii.ac.jp/record/12330/files/Quantitative_characterization_acidic_groups_acid-treated.pdf
eng
10.1016/j.carbon.2013.09.038
https://doi.org/10.1016/j.carbon.2013.09.038
Copyright© 2013 Elsevier Ltd.