Field emission luminescence of nanodiamonds deposited on the aligned carbon nanotube array

Abstract

Detonation nanodiamonds (NDs) were deposited on the surface of aligned carbon nanotubes (CNTs) by immersing a CNT array in an aqueous suspension of NDs in dimethylsulfoxide (DMSO). The structure and electronic state of the obtained CNT–ND hybrid material were studied using optical and electron microscopy and Infrared, Raman, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopy. A non-covalent interaction between NDs and CNT and preservation of vertical orientation of CNTs in the hybrid were revealed. We showed that current-voltage characteristics of the CNT–ND cathode are changed depending on the applied field; below ~3 V/µm they are similar to those of the initial CNT array and at the higher field they are close to the ND behavior. Involvement of the NDs in field emission process resulted in blue luminescence of the hybrid surface at an electric field higher than 3.5 V/µm. Photoluminescence measurements showed that the NDs emit blue-green light, while blue luminescence prevails in the CNT–ND hybrid. The quenching of green luminescence was attributed to a partial removal of oxygen-containing groups from the ND surface as the result of the hybrid synthesis.

Heat transfer and friction factor of multi-walled carbon nanotubes–Fe 3 O 4 nanocomposite nanofluids flow in a tube with/without longitudinal strip inserts

“…On the other hand, the C 1s core level peak presents a sharp feature followed by broader structures at higher binding energies that can be fitted by four components. The first sharp component is centered at a binding energy of 284.4 eV and can be related with carbon atoms from the MWCNT [45]. The other components are broader, and they appear at binding energy of 285.2 eV, 286.6 eV and 288.9 eV and they correspond to C atoms in sp 3 configuration [43,45], CAOH or CAOAC [45], and O@CAO [43,45], respectively.…”

“…The first sharp component is centered at a binding energy of 284.4 eV and can be related with carbon atoms from the MWCNT [45]. The other components are broader, and they appear at binding energy of 285.2 eV, 286.6 eV and 288.9 eV and they correspond to C atoms in sp 3 configuration [43,45], CAOH or CAOAC [45], and O@CAO [43,45], respectively. Thus, considering this entire information, Table 3 Main parameters obtained by fitting high resolution XPS spectra using Gaussian-Lorentz line shape.…”

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

“…Компоненты спектра с максимумами на энергиях связи ∼ 287, 289, 290 eV отвечают углеро-ду в составе эпоксидных и фенольных групп (С−О, С−O−C, C−OH), карбонильных групп (С=О), а также карбоксильных групп (COOН), соответственно [12,13]. Наиболее высокоэнергетический компонент спектра с максимумом на энергии связи ∼ 292 eV соответствует " shake up" сателлиту, характерному для упорядоченных графитизированных углеродных материалов [14].…”

Формирование Слоев Пористого Кристаллического Диоксида Олова С Использованием Композита На Основе Массивов Многостенных Углеродных Нанотрубок

“…В спектре присутствуют сла-боинтенсивные максимумы, соответствующие углероду в составе гид-роксильных/фенольных (С−OH), а также карбоксильных/карбонильных групп (С=O/COOH) при энергиях фотонов ∼ 287 и ∼ 288.7 eV соот-ветственно [3,7]. Кроме того, в низкоэнергетической области спектра поглощения наблюдается присутствие состояний, отвечающих аморф-ному углероду [10]. Это свидетельствует о деструкции МУНТ в составе композита, обусловленной их термическим окислением.…”