Nitrogen-doped nanodiamond films grown just by heating solid precursor thin layers for field emission application

Guo, Xin; Wang, Yanzhou; Wang, Xiao; Xi, Xu; Gu, Yipeng; Liu, Qirui; Li, Yali; Li, Junshuai

doi:10.1088/1361-6463/ab4762

Cited by 5 publications

(5 citation statements)

References 55 publications

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“…The fabrication of nanodiamonds by PTFE laser processing with higher pulse widths is plausible; however, the yield is small with less control and material degradation, due to the limited undercooling achieved and prolonged exposure to high temperatures [8]. These costeffective methods have been employed to produce high quality graphene and nanodiamond composites for field emission applications [9,10]. The susceptibility towards sublimation [2] also presents a considerable bottleneck in carbon thermal processing.…”

Section: Introductionmentioning

confidence: 99%

Direct conversion of Teflon into nanodiamond films

Gupta

Narayan

2020

Materials Research Letters

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We report a novel nonequilibrium approach for direct laser writing diamond by melting amorphous polytetrafluoroethylene (PTFE:(C 2 F 4) n) in ambient conditions. The nanosecond laser pulses disintegrate PTFE, forming the undercooled molten carbon. This undercooled molten carbon regrows into diamond during the ultrafast melt quenching process, which lasts for ∼ 100 ns. HRTEM imaging, SAED, Raman, and EEL spectroscopy investigations confirm the first-order phase transformation of PTFE into single-crystalline < 110 > oriented diamond, which is associated with ultrafast unseeded crystallization. Our experimental findings open up a new pathway for the selective conversion of organic polymers into nano and microdiamonds and thin films with laser-writing. IMPACT STATEMENT This research represents a fundamental breakthrough in selective conversion of PTFE polymeric films into single crystalline diamond thin films by pulsed laser annealing at near ambient conditions.

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Section: Introductionmentioning

confidence: 99%

Direct conversion of Teflon into nanodiamond films

Gupta

Narayan

2020

Materials Research Letters

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“…Recently, Guo X. et al also proved the role of N doping for improving the properties. The turn-on E and the maximum J of the synthesized ND film with ~1.95 at.% N were, respectively, reduced to ~3.6 V/µm at 10 μA/cm 2 , and raise up to 1 mA/cm 2 at 6 V/µm, and the excellent long-term emission stability can be achieved for the optimal N-doped ND film [ 15 ]. Therefore, it can be concluded that the introduction of N not just induces a n-type conductivity, but aggravates the formation of sp 2 phase carbon, and thus enhances the field emission properties of ND film.…”

Section: Field Emission Properties Of Nd Filmmentioning

confidence: 99%

“…During the last decades, many efforts, such as the N/B element doping [ 15 , 16 , 17 ], the surface morphology [ 18 , 19 ], the micropatterned structures [ 20 , 21 ], and the introduction of the high content sp 2 hybridized carbon [ 22 , 23 ], were conducted to obtain a low surface potential barrier and a low work function of the ND films, then substantially improves the field emission properties. For example, Hao T. et al reported that the ND cones synthesized by the gray-scale patterns with a focused-ion-beam (FIB) system could obtain a high emission current up to 54 μA at an applied voltage of 10 V [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Hao T. et al reported that the ND cones synthesized by the gray-scale patterns with a focused-ion-beam (FIB) system could obtain a high emission current up to 54 μA at an applied voltage of 10 V [ 21 ]. Guo X. et al proposed a N-doped ND film by heating the solid thin layer of urea in a resistance-heating furnace, exhibiting a low turn-on electric field strength of 3.6 V µm −1 defined at the current density of 0.01 mA cm −2 [ 15 ]. Moreover, the field emission properties are largely determined by the quality and microstructure of synthesized ND films.…”

Section: Introductionmentioning

confidence: 99%

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Recent Progress of Nanodiamond Film in Controllable Fabrication and Field Emission Properties

et al. 2023

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The interest in the field electron emission cathode nanomaterials is on the rise due to the wide applications, such as electron sources, miniature X-ray devices, display materials, etc. In particular, nanodiamond (ND) film is regarded as an ideal next-generation cathode emitter in the field emission devices, due to the low or negative electron affinity, small grain size, high mechanical hardness, low work function, and high reliability. Increasing efforts are conducted on the investigation of the emission structures, manufacturing cost, and field emission properties improvement of the ND films. This review aims to summarize the recent research, highlight the new findings, and provide a roadmap for future developments in the area of ND film electron field emitter. Specially, the optimizing methods of large-scale, high-quality, and cost-effective synthesis of ND films are discussed to achieve more stable surface structure and optimal physical properties. Additionally, the mainstream strategies applied to produce high field emission performance of ND films are analyzed in detail, including regulating the grain size/boundary, hybrid phase carbon content, and doping element/type of ND films; meanwhile, the problems existing in the related research and the outlook in this area are also discussed.

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“…In its intrinsic form, diamond exhibits very high resistivity, rendering it unusable for many electrochemical applications. Traditionally, this has been commonly addressed through doping with different elements such as boron, nitrogen, phosphorous, sulfur, and arsenic. − So far, boron-doped diamond is the most extensively used diamond in electrochemistry due to its high conductivity. The processes of chemical vapor deposition synthesis and boron doping ( in situ and ex situ ) are mainly utilized for the fabrication of thin films.…”

Section: Introductionmentioning

confidence: 99%

Single-Step Fabrication Method toward 3D Printing Composite Diamond–Titanium Interfaces for Neural Applications

Mani

Ahnood

Peng

et al. 2021

ACS Appl. Mater. Interfaces

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Owing to several key attributes, diamond is an attractive candidate material for neural interfacing electrodes. The emergence of additivemanufacturing (AM) of diamond-based materials has addressed multiple challenges associated with the fabrication of diamond electrodes using the conventional chemical vapor deposition (CVD) approach. Unlike the CVD approach, AM methods have enabled the deposition of three-dimensional diamond-based material at room temperature. This work demonstrates the feasibility of using laser metal deposition to fabricate diamond−titanium hybrid electrodes for neuronal interfacing. In addition to exhibiting a high electrochemical capacitance of 1.1 mF cm −2 and a low electrochemical impedance of 1 kΩ cm 2 at 1 kHz in physiological saline, these electrodes exhibit a high degree of biocompatibility assessed in vitro using cortical neurons. Furthermore, surface characterization methods show the presence of an oxygenrich mixed-phase diamond−titanium surface along the grain boundaries. Overall, we demonstrated that our unique approach facilitates printing biocompatible titanium−diamond site-specific coating-free conductive hybrid surfaces using AM, which paves the way to printing customized electrodes and interfacing implantable medical devices.

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Nitrogen-doped nanodiamond films grown just by heating solid precursor thin layers for field emission application

Cited by 5 publications

References 55 publications

Direct conversion of Teflon into nanodiamond films

Direct conversion of Teflon into nanodiamond films

Recent Progress of Nanodiamond Film in Controllable Fabrication and Field Emission Properties

Single-Step Fabrication Method toward 3D Printing Composite Diamond–Titanium Interfaces for Neural Applications

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