Double-walled carbon nanotube （DWCNT） macro-films with large areas, excellent flexibility and superhydrophobicity are reported. The area of the macro-film is larger than 30 cm×15 cm, and this large film can be ...Double-walled carbon nanotube （DWCNT） macro-films with large areas, excellent flexibility and superhydrophobicity are reported. The area of the macro-film is larger than 30 cm×15 cm, and this large film can be bended, or folded without any damage, and even can be tailored freely. After a simple modification of perfluoroalkysilane, the surface of the macro-film shows excellent superhydrophobicity with a water contact angle of 165.74-2 deg. and sliding angle lower than 3 deg., the prepared superhydrophobic films showing excellent antifouling, self-cleaning and water-repellent functions. The topographic roughness and perfluoroalkysilane modification are found to contribute to the observed superhydrophobicity. Considering the outstanding electronic, chemical and mechanical properties of DWCNTs, it is expected that this multifunctional DWCNT macro-film has potential applications in many fields.展开更多
In this study, double-walled carbon nanotubes （DWCNTs） in ethylene glycol （EG） and N,N-dimethyl- formamide （DMF） media were investigated by a simple ultrasonication method. Homogeneously dispersed and highly con...In this study, double-walled carbon nanotubes （DWCNTs） in ethylene glycol （EG） and N,N-dimethyl- formamide （DMF） media were investigated by a simple ultrasonication method. Homogeneously dispersed and highly concentrated DWCNTs are in EG （95 vol%） and DMF （5 vol%） media without the addition of surfactant. Surface structure and crystallinity of DWCNTs undergo minimal change. The highly concentrated dispersion state of DWCNTs helps in Pt loading. Pt particles prepared in the homogenous dispersion system have small sizes and are uniformly distributed. The prepared Pt catalysts display a similar electrochemical activity to catalysts pre- pared in EG system with low concentration. The results demonstrate that homogenously dispersed and highly concentrated DWCNTs can realize mass production of Pt/ DWCNT catalysts with high electrochemical activity and low cost.展开更多
A versatile wet chemistry method is developed for filling of subnanometer sized metal particles in carbon nanotubes with a diameter smaller than 1.5 nm. As an example, we showed that a confined bi-component Pd-V catal...A versatile wet chemistry method is developed for filling of subnanometer sized metal particles in carbon nanotubes with a diameter smaller than 1.5 nm. As an example, we showed that a confined bi-component Pd-V catalyst exhibit a higher benzene hydroxylation activity compared with that within multi-walled carbon nanotubes.展开更多
We report on a diode-pumped passively continuous wave （cw） mode-locked Tm：YAP laser with a double-wall carbon nanotube （DWCNT） absorber operating at a wavelength of 2023 nm for the first time, to the best our kno...We report on a diode-pumped passively continuous wave （cw） mode-locked Tm：YAP laser with a double-wall carbon nanotube （DWCNT） absorber operating at a wavelength of 2023 nm for the first time, to the best our knowledge. The DWCNT absorber is fabricated on a hydrophilic quartz substrate by using the vertical evaporation technique. The output power is as high as 375 mW. A stable pulse train with a repetition rate of 72.26 MHz is generated with a highest single pulse energy of 5.2 μJ.展开更多
基金supports by the National Natural Science Foundation of China (No. 50871067)the National 863 Project (No. 2007AA05Z128) from the Ministry of Science and Technology of China
文摘Double-walled carbon nanotube （DWCNT） macro-films with large areas, excellent flexibility and superhydrophobicity are reported. The area of the macro-film is larger than 30 cm×15 cm, and this large film can be bended, or folded without any damage, and even can be tailored freely. After a simple modification of perfluoroalkysilane, the surface of the macro-film shows excellent superhydrophobicity with a water contact angle of 165.74-2 deg. and sliding angle lower than 3 deg., the prepared superhydrophobic films showing excellent antifouling, self-cleaning and water-repellent functions. The topographic roughness and perfluoroalkysilane modification are found to contribute to the observed superhydrophobicity. Considering the outstanding electronic, chemical and mechanical properties of DWCNTs, it is expected that this multifunctional DWCNT macro-film has potential applications in many fields.
基金financially supported by the National Natural Science Foundation of China(Nos.51202095 and 51264010)the Open Research Project of the State Key Laboratory of Millimeter Waves(No.K201218)+1 种基金the Department of Educational,Science and Technology,and Human Resources and Social Security of Jiangxi Province(Nos.GJJ12366,20122BAB216013,20121BBE50027,and [2012]195)the China Postdoctoral Science Foundation(No.2012M511458)
文摘In this study, double-walled carbon nanotubes （DWCNTs） in ethylene glycol （EG） and N,N-dimethyl- formamide （DMF） media were investigated by a simple ultrasonication method. Homogeneously dispersed and highly concentrated DWCNTs are in EG （95 vol%） and DMF （5 vol%） media without the addition of surfactant. Surface structure and crystallinity of DWCNTs undergo minimal change. The highly concentrated dispersion state of DWCNTs helps in Pt loading. Pt particles prepared in the homogenous dispersion system have small sizes and are uniformly distributed. The prepared Pt catalysts display a similar electrochemical activity to catalysts pre- pared in EG system with low concentration. The results demonstrate that homogenously dispersed and highly concentrated DWCNTs can realize mass production of Pt/ DWCNT catalysts with high electrochemical activity and low cost.
基金Supported by Shandong Province Doctoral Foundation(2006BS04039)Shandong Province Natural Science foundation(Y2005B02)Shandong Scientific and Technical Items(GG4402056).
基金supported by the National Natural Science Foundation of China (Grant No 21173215, 21033009 and 11079005)
文摘A versatile wet chemistry method is developed for filling of subnanometer sized metal particles in carbon nanotubes with a diameter smaller than 1.5 nm. As an example, we showed that a confined bi-component Pd-V catalyst exhibit a higher benzene hydroxylation activity compared with that within multi-walled carbon nanotubes.
基金Project supported by the National Natural Science Foundation of China (Grant No. 61078032)the Science and Technology Funds on Solide-State Laser Laboratory of China (Grant No. 9140C0403011106)
文摘We report on a diode-pumped passively continuous wave （cw） mode-locked Tm：YAP laser with a double-wall carbon nanotube （DWCNT） absorber operating at a wavelength of 2023 nm for the first time, to the best our knowledge. The DWCNT absorber is fabricated on a hydrophilic quartz substrate by using the vertical evaporation technique. The output power is as high as 375 mW. A stable pulse train with a repetition rate of 72.26 MHz is generated with a highest single pulse energy of 5.2 μJ.
