Role of Defects in Carbon Nanotube Walls in Deposition of CdS Nanoparticles from a Chemical Bath

Bulusheva, L. G.; Fedoseeva, Yu. V.; Kurenya, A. N.; Vyalikh, D. V.; Окотруб, А. В.

doi:10.1021/acs.jpcc.5b07549

Cited by 12 publications

(14 citation statements)

References 49 publications

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“…The spectra were normalized to the intensity at 310 eV. The resonances at ~285.6 and ~291.7 eV correspond to electron transitions from 1s levels to π* and σ* states, respectively [ 56 , 57 ]. The peaks between ~287 and ~291 eV refer to the transitions involving carbon atoms bonded to functional groups and to defects [ 58 , 59 ].…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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Vertically aligned carbon nanotube (CNT) arrays show potential for the development of planar low-voltage emission cathodes. The characteristics of cathodes can be improved by modifying their surface, e.g., by hydrogen plasma treatment, as was performed in this work. The surface of multi-walled CNT arrays grown on silicon substrates from toluene and ferrocene using catalytic chemical vapor deposition was treated in a high-pressure (~104 Pa) microwave reactor. The structure, composition, and current-voltage characteristics of the arrays were studied before and after hydrogen plasma treatment at various power values and durations. CNT tips were destroyed and catalytic iron was released from the CNT channels. The etching rate was influenced by iron particles that formed on the array surface. The lower emission threshold in the plasma-treated arrays than in the initial sample is explained by the amplification factor of the local electric field increasing due to graphene structures of unfolded nanotube layers that formed at the CNT tips.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

et al. 2020

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“…39,40 The presence of the S−S bonds on the surface of CdS nanoparticles grown on MWCNTs was previously explained by the S-rich surface of CdS and S−S−S linkages between surface atoms. 15 A high-energy component at 168 eV is attributed to sulfate species, which may develop at the MWCNT edges during their treatment by sulfuric acid. Moreover, sulfate species can arise due to the reaction of CdS nanoparticles with water.…”

Section: Resultsmentioning

confidence: 99%

“…14 Quantum-chemical calculations revealed that Cd 2+ ions and Cd(II) complexes should not interact with defect-free CNT walls, and nucleation and growth of CdS particles on the CNT surface more likely occur at edge states of graphene network. 15 It was reported that the presence of oxygen-containing groups on the CNT surface assists adsorption of Cd 2+ ions from an aqueous solution. 16 These functional groups along with defect sites appearing because of acid treatment or air oxidation of CNTs improve the nucleation of CdS on the nanotube surface.…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Surface of Carbon Nanotube Buckypaper for Uniform Growth of CdS Nanoparticles

et al. 2017

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Interfacial interactions between CdS species and multiwalled carbon nanotubes (MWCNTs) determine the architecture and optical characteristics of CdS/MWCNT hybrids. The effect of fluorinated surface of MWCNT buckypaper on the decoration with CdS nanoparticles from an ammonia solution of cadmium(II) chloride and thiourea has been studied. Scanning electron microscopy showed that the fluorinated carbon surface provides more dense growth and uniform distribution of CdS nanoparticles. X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopies revealed a partial defluorination of the nanotubes and the formation of elemental sulfur as a result of a joint action of thiourea and ammonia. The carbon atoms freed of fluorine were found from density functional theory calculations to be active sites for attachment of Cd(II) complexes present in the chemical bath and subsequent growth of CdS nanoparticles. The obtained hybrid possesses dual photoluminescence from fluorinated MWCNTs and CdS nanoparticles. Under applied electric field, it emits blue light that is possible only for very small CdS nanocrystals. This work provides a concept for fabrication of CNT-based hybrid structures with the high density of semiconducting nanoparticles for optoelectronic applications.

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“…Облучение ионами аргона создает радиационные дефекты, приводящие к разру-шению системы π-электронов sp 2 -углерода [25]. При этом, появление 2-x координированных атомов углерода в составе вакансионных дефектов, которые обладают высокой реакционной способностью [26], приводит к закреплению кислорода к стенкам N-МУНТ в виде различных функциональных групп. В результате это-го снижается количество свободных носителей заряда на поверхности углеродных нанотрубок.…”

Section: рис 4 рфэ-спектры валентной зоны исходных (1) и облучен-ныunclassified

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

Несов¹,

Корусенко²,

Болотов³

et al. 2017

Физика Твердого Тела

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Методами рентгеновской фотоэлектронной спектроскопии (РФЭС) и анализа ближней тонкой структуры поглощения (XANES) с использованием синхротронного излучения получены данные об изменении электронной структуры и химического состава азотсодержащих многостенных углеродных нанотрубок (N-МУНТ) вследствие облучения ионами аргона с энергией 5 keV. Установлено, что облучение приводит к увеличению степени дефектности структуры N-МУНТ и окислению углерода с образованием различных кислородсодержащих групп (C−OH, C=O/COOH, C−O−C/O−C−O, CO 3 ). Наличие углерод-кислородных связей на поверхности углеродных нанотрубок связано с формированием радиационных дефектов. Показано, что увеличение в результате облучения доли атомов азота в замещающей конфигурации в структуре стенок N-МУНТ, не приводит к повышению плотности занятых состояний вблизи уровня Ферми на фоне увеличения степени дефектности структуры, окисления углерода и понижения общей концентрации азота. Полученные результаты показывают, что облучение N-МУНТ ионами аргона позволяет эффективно функционализировать их поверхность.Исследование выполнено при частичной финансовой поддержке РФФИ в рамках научных проектов № 15-42-04308 р_сибирь_а и № 16-08-00763 а.

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Role of Defects in Carbon Nanotube Walls in Deposition of CdS Nanoparticles from a Chemical Bath

Cited by 12 publications

References 49 publications

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Hydrogen Plasma Treatment of Aligned Multi-Walled Carbon Nanotube Arrays for Improvement of Field Emission Properties

Fluorinated Surface of Carbon Nanotube Buckypaper for Uniform Growth of CdS Nanoparticles

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

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