Effect of ion irradiation on the properties of carbon nanotube buckypapers

Abstract

Optical, electrical and structural properties of argon (Ar) ion-irradiated buckypapers of multi-walled carbon nanotube (MWCNT) at various doses prepared by a vacuum filtration method were investigated. It was found that the direct current (DC) conductivity and absorption spectra in the visible range were decreased with an increasing Ar ion irradiation dose. A subsequent heating of nanotube buckypapers at 800 K in a vacuum at each irradiation dose improved the conductivity of buckypapers, whereas optical absorption was unchanged. Moreover, the graphite structure of MWCNTs was transformed to amorphous structure with an increasing Ar ion irradiation dose. The decrease of optical absorption and electrical conductivity of MWCNT buckypaper at room temperature can be ascribed to the increase of defects in the irradiated MWCNTs.

Optically transparent carbon nanowire thin film

“…It is clear from the TEM images (Figure 1d) that at the dose of 1 Â 10 17 ions/cm 2 for Ar ions, the graphite structure of MWCNTs was strongly damaged while the amorphous nature of the MWCNTs is clear as is indicated by the selected area electron diffraction (SAED) pattern of a-CNW (shown in the inset). In addition, ion dose 1 Â 10 17 ions/cm 2 for Ar ions is the optimum dose for MWCNTs to be transformed into a-CNWs [18]. Further, higher doses can destroy a-CNWs and they could be transformed into carbon films [11].…”

TUNING THE OPTICAL PROPERTIES OF MULTIWALL CARBON NANOTUBE THIN FILMS BY N+ ION BEAMS IRRADIATION

“…19 Commercially available purified nanotubes with purity of 99% (Applied Nanotechnologies, Inc.) were dissolved in 1% solution of sodium dodecyl sulphate (SDS) surfactant. The solution was then bath-sonicated for 4 h and left undisturbed for 24 h for settling down the undissolved MWCNTs bundles.…”

“…In our previous experiments, it was also observed that high dose could transform the MWCNTs into amorphous structure. 19 We have simulated the penetration of N + ions of energy 25 keV into a MWCNTs with density 1.69 g/cm 3 using the TRIM code, 23 finding that N ions penetrated approximately 90 nm deep into the MWCNTs. Additionally, the low-density random networks of MWCNT thin films contain a significant fraction of voids and 25-keV N + ions can move deeper inside the film.…”

“…[15][16][17][18][19] Recently, the effect of defects on the conducting properties of individual metallic single-wall carbon nanotubes (SWCNTs) was shown 20,21 by the controlled reduction of the electronic localization length by irradiation with Ar ions. Irradiationinduced changes of thin film also play a significant role in the case of device fabrication.…”

Электронная Структура Азотсодержащих Углеродных Нанотрубок, Облученных Ионами Аргона: Исследование Методами РФЭС И XANES

“…Основным недостатком указанных мето-дов является применение опасных и токсичных реа-гентов, а также необходимость проведения процедур очистки функционализированных УНТ от их остат-ков. Другим подходом для функционализации поверх-ности УНТ является использование физических мето-дов, основанные на воздействии пучков заряженных частиц [6][7][8]. Такие методы являются более контроли-руемыми и технологичными.…”