Helium-ion-beam nanofabrication: extreme processes and applications

He, Shixuan; Tian, Rong; Wu, Wei; Li, Wen‐Di; Wang, Deqiang

doi:10.1088/2631-7990/abc673

Cited by 49 publications

(28 citation statements)

References 109 publications

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“…According to TEM results, the chemical composition of SEI is measured via XPS with an Ar + sputtering in depth [ 41 ]. Figure 8 a, b shows the changes of C 1 s , O 1 s , F 1 s , and S 2 p in the SEI films of Sb 2 S 3 and Sb 2 S 3 @0.1CDs, respectively, with the increased sputtering time.…”

Section: Resultsmentioning

confidence: 99%

Natural Stibnite for Lithium-/Sodium-Ion Batteries: Carbon Dots Evoked High Initial Coulombic Efficiency

Xiang

et al. 2022

Nano-Micro Lett.

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Highlights The chemical process of local oxidation–partial reduction–deep coupling for stibnite reduction of carbon dots (CDs) is revealed by in-situ high-temperature X-ray diffraction. Sb2S3@xCDs anode delivers high initial coulombic efficiency in lithium ion batteries (85.2%) and sodium ion batteries (82.9%), respectively. C–S bond influenced by oxygen-rich carbon matrix can restrain the conversion of sulfur to sulfite, well confirmed by X-ray photoelectron spectroscopy characterization of solid electrolyte interphase layers helped with density functional theory calculations. CDs-induced Sb–O–C bond is proved to effectively regulate the interfacial electronic structure. Abstract The application of Sb2S3 with marvelous theoretical capacity for alkali metal-ion batteries is seriously limited by its poor electrical conductivity and low initial coulombic efficiency (ICE). In this work, natural stibnite modified by carbon dots (Sb2S3@xCDs) is elaborately designed with high ICE. Greatly, chemical processes of local oxidation–partial reduction–deep coupling for stibnite reduction of CDs are clearly demonstrated, confirmed with in situ high-temperature X-ray diffraction. More impressively, the ICE for lithium-ion batteries (LIBs) is enhanced to 85%, through the effect of oxygen-rich carbon matrix on C–S bonds which inhibit the conversion of sulfur to sulfite, well supported by X-ray photoelectron spectroscopy characterization of solid electrolyte interphase layers helped with density functional theory calculations. Not than less, it is found that Sb–O–C bonds existed in the interface effectively promote the electronic conductivity and expedite ion transmission by reducing the bandgap and restraining the slip of the dislocation. As a result, the optimal sample delivers a tremendous reversible capacity of 660 mAh g−1 in LIBs at a high current rate of 5 A g−1. This work provides a new methodology for enhancing the electrochemical energy storage performance of metal sulfides, especially for improving the ICE.

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Section: Resultsmentioning

confidence: 99%

Natural Stibnite for Lithium-/Sodium-Ion Batteries: Carbon Dots Evoked High Initial Coulombic Efficiency

Xiang

et al. 2022

Nano-Micro Lett.

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“…98 Similar considerations apply also for techniques using different ion beams, such as the one based on helium. 99 This method was recently employed for creating single and double vacancies in graphene, 100 as well as small defects of the order of 0.5 nm in transition metal dichalcogenides. 101 Alternatively, short QDs operating in the Coulomb blockade regime can be generated by controlled kinks produced by an AFM tip, 23 or usual contact Schottky barriers.…”

Section: Discussionmentioning

confidence: 99%

Metallic carbon nanotube quantum dots with broken symmetries as a platform for tunable terahertz detection

Buchs

Margańska

González

et al. 2021

Applied Physics Reviews

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Generating and detecting radiation in the technologically relevant range of the so-called terahertz gap (0.1 − 10 THz) is challenging because of a lack of efficient sources and detectors. Quantum dots in carbon nanotubes have shown great potential to build sensitive terahertz detectors usually based on photon-assisted tunnelling. A recently reported mechanism combining resonant quantum dot transitions and tunnelling barriers asymmetries results in a narrow linewidth photocurrent response with a large signal-to-noise ratio under weak THz radiation. That device was sensitive to one frequency, corresponding to transitions between equidistant quantized states. In this work we show, using numerical together with scanning tunnelling spectroscopy studies of a defect-induced metallic zigzag single-walled carbon nanotube quantum dot that simultaneously breaking various symmetries in metallic nanotube quantum dots of arbitrary chirality strongly relaxes the selection rules in the electric dipole approximation, and removes energy degeneracies. This leads to a richer set of allowed optical transitions spanning frequencies from 1 THz to several tens of THz, for a ∼10 nm quantum dot. Based on these findings, we propose a terahertz detector device based on a metallic single-walled carbon nanotube quantum dot defined by artificial defects. Depending on its length and contacts transparency, the operating regimes range from a high-resolution gate-tunable terahertz sensor to a broadband terahertz detector. Our calculations indicate that the device is largely unaffected by temperatures up to 100 K, making carbon nanotube quantum dots with broken symmetries a promising platform to design tunable terahertz detectors that could operate at liquid nitrogen temperatures.

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“…The list of referenced works is certainly not exhaustive in this extensive and rapidly evolving field. For previous reviews, the reader is referred to [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A review of defect engineering, ion implantation, and nanofabrication using the helium ion microscope

Allen¹

2021

Beilstein J. Nanotechnol.

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The helium ion microscope has emerged as a multifaceted instrument enabling a broad range of applications beyond imaging in which the finely focused helium ion beam is used for a variety of defect engineering, ion implantation, and nanofabrication tasks. Operation of the ion source with neon has extended the reach of this technology even further. This paper reviews the materials modification research that has been enabled by the helium ion microscope since its commercialization in 2007, ranging from fundamental studies of beam–sample effects, to the prototyping of new devices with features in the sub-10 nm domain.

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Helium-ion-beam nanofabrication: extreme processes and applications

Cited by 49 publications

References 109 publications

Natural Stibnite for Lithium-/Sodium-Ion Batteries: Carbon Dots Evoked High Initial Coulombic Efficiency

Natural Stibnite for Lithium-/Sodium-Ion Batteries: Carbon Dots Evoked High Initial Coulombic Efficiency

Metallic carbon nanotube quantum dots with broken symmetries as a platform for tunable terahertz detection

A review of defect engineering, ion implantation, and nanofabrication using the helium ion microscope

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