Chemical modification of carbon nanotube for improvement of field emission property

Lee, Sunwoo; Oda, Tetsuji; Shin, Paik-Kyun; Lee, Boong-Joo

doi:10.1016/j.mee.2009.02.021

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…The use of CNT arrays allows the emitter power to increase, consequently expanding their range of application. Cathode emission characteristics can be improved by chemically modifying the CNT’s surface, e.g., by depositing nanoparticles and compounds [ 8 , 9 , 10 ]. Efficient operation of cathodes composed of vertically-aligned CNTs requires the array surface to be geometrically uniform to provide a constant amplification factor and a constant work function at different parts of the surface.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…In our case, P3HT/Si-NP heterojunction is considered to be the main D-A couple since the V oc of P3HT/(Si-NP + MWCNT) is similar to that of the P3HT/Si-NP solar cell rather than the P3HT/MWCNT solar cell. Therefore, it is proposed that in a simple physical blend situation, a certain amount of MWCNT might play the role of a hole trapper in considering its high work function while some aggregated MWCNTs might act as the carrier scattering center [44,45], both of which will negatively affect the carrier transport in the photovoltaic devices.…”

Section: Photovoltaic Response Of P3ht/si@mwcnt Hybrid Filmsmentioning

confidence: 99%

Hybrid solar cells based on P3HT and Si@MWCNT nanocomposite

et al. 2010

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A nanocomposite material (Si@MWCNT) with a core/sheath heterostructure consisting of silicon nanoparticles (Si-NPs) covalently bonded onto a multi-walled carbon nanotube (MWCNT) is used as a new material for solar cells. The photovoltaic response of a poly (3-hexylthiophene) (P3HT)/Si@MWCNT hybrid film is studied by I-V measurements under simulated one-sun AM 1.5 illumination (100 mW cm(-2)). In comparison with simple P3HT/Si-NPs and P3HT/MWCNT devices, the power conversion efficiency of the (P3HT)/Si@MWCNT nano-hybrid device is enhanced by 3 and 20 times, respectively. Photo-physical and energy diagram investigations suggest that the improved device performance is attributed to the combination of efficient charge generation by the P3HT/Si-NPs bulk heterojunction and efficient charge collection as a result of MWCNT template directed carrier transport.

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“…The electron field emission is one of the most interesting applications in cold cathode devices, miniature microwave generators, monochromatic electron sources and microelectronics [6,7] in general. The conventional electronic devices usually utilise electron beams through thermionic emission which is power consuming because of heating of the cathode to high temperature up to 2000 C. The researchers all over the world and lot of financial flows are directed to obtaining a stable and high current field electron emission that can be used for field emission displays, which has a wide market in personal computers.…”

Section: Introductionmentioning

confidence: 99%

Preparation and field emission study of low-dimensional ZnS arrays and tubules

Chauhan

Kumar

Chakarvarti

2013

Journal of Experimental Nanoscience

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In the present work, freestanding ZnS nanotipped arrays and hollow tubules have been generated using an electrodeposition technique via template synthesis. The structures and morphologies of the arrays and tubules were investigated using X-ray diffraction and scanning electron microscopy, respectively. Electron field emission properties of the ZnS nanotipped arrays and tubules have been studied in a good vacuum condition at room temperature and current-voltage characteristics were found to follow the Fowler-Nordheim theory.It is found that ZnS tubules show good electron field emission properties at low voltage with large field enhancement factor compared to ZnS solid arrays. Optical properties of such synthesised structures were also studied using ultravioletvisible spectrophotometery.

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Chemical modification of carbon nanotube for improvement of field emission property

Cited by 7 publications

References 10 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

Hybrid solar cells based on P3HT and Si@MWCNT nanocomposite

Preparation and field emission study of low-dimensional ZnS arrays and tubules

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