title: Tuning of the photoluminescence and up-conversion photoluminescence properties of single-walled carbon nanotubes by chemical functionalization.
abstract: Single-walled carbon nanotubes (SWNTs) were subjected to alkylation using alkyl bromide and alkyl dibromide, and the photoluminescence (PL) properties of the resulting alkylated SWNTs were characterized. Two new PL peaks were observed along with the intrinsic PL peak at 976 nm when alkyl bromide was used (SWNT-Bu: ∼1095 and 1230 nm, SWNT-Bn: 1104 and 1197 nm). In contrast, the use of α,α'-dibromo-o-xylene as an alkyl dibromide primarily resulted in only one new PL peak, which was observed at 1231 nm. The results revealed that the Stokes shift of the new peaks was strongly influenced by the addition patterns of the substituents. In addition, the time-resolved PL decay profiles of the alkylated SWNTs revealed that the PL peaks possessing a larger Stokes shift had longer exciton lifetimes. The up-conversion PL (UCPL) intensity of the alkylated SWNTs at excitation wavelengths of 1100 and 1250 nm was estimated to be ∼2.38 and ∼2.35 times higher than that of the as-dispersed SWNTs, respectively.
authors.affiliation: Department of Chemistry, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan. ymaeda@u-gakugei.ac.jp.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Maeda
authors.affiliation: Department of Chemistry, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan. ymaeda@u-gakugei.ac.jp.
authors.forename: Shun
authors.initials: S
authors.lastname: Minami
authors.affiliation: Department of Chemistry, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan. ymaeda@u-gakugei.ac.jp.
authors.forename: Yuya
authors.initials: Y
authors.lastname: Takehana
authors.affiliation: Fukui Institute for Fundamental Chemistry, Kyoto University, Sakyou-ku, Kyoto 606-8103, Japan.
authors.forename: Jing-Shuang
authors.initials: JS
authors.lastname: Dang
authors.affiliation: Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.forename: Shun
authors.initials: S
authors.lastname: Aota
authors.affiliation: Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.forename: Kazunari
authors.initials: K
authors.lastname: Matsuda
authors.affiliation: Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Miyauchi
authors.affiliation: Department of Chemistry, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan. ymaeda@u-gakugei.ac.jp.
authors.forename: Michio
authors.initials: M
authors.lastname: Yamada
authors.affiliation: Department of Chemistry, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan. ymaeda@u-gakugei.ac.jp.
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Suzuki
authors.affiliation: Institute for Chemical Physics & Department of Chemistry, State Key Laboratory of Electrical Insulation and 5Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
authors.forename: Rui-Sheng
authors.initials: RS
authors.lastname: Zhao
authors.affiliation: Institute for Chemical Physics & Department of Chemistry, State Key Laboratory of Electrical Insulation and 5Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Fukui Institute for Fundamental Chemistry, Kyoto University, Sakyou-ku, Kyoto 606-8103, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nagase