Preparation of twin graphene quantum dots through the electric-field-assisted femtosecond laser ablation of graphene dispersions

Li, Xiaojie; Jiang, Lan; Zuo, Pei; Wang, Sumei; Chen, Xiaozhe; Liang, Misheng; Ma, Le

doi:10.1016/j.carbon.2021.09.043

Cited by 7 publications

(4 citation statements)

References 77 publications

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“…[15,22,23] However, the Coulomb explosion-induced splitting of FLG sheets might increase the electron emission current, whereas, the field evaporation induced breaking of FLG would decrease the performance of FLG as an electron emitter. [14] Meanwhile, the Coulomb explosion may be utilized to cleave FLG and the similar two-dimensional materials, [24][25][26] and the field evaporation could process the edge structure of FLG. [16] Moreover, it may need more consideration for the Coulomb explosionassisted APT, since the Coulomb explosion causes different structural changes compared with the field evaporation.…”

Section: Discussionmentioning

confidence: 99%

Dynamic Observation of the Coulomb Explosion and Field Evaporation of a Few‐Layer Graphene Nanoribbon

Wang

et al. 2023

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The electric field would lead to charge redistributions in the system and a large number of charges would concentrate locally at the surface of the nano-tips so that a plenty of novel physical phenomena might emerge. For example, the local electric field near the tip will be significantly enhanced and the electrons might be pulled out from a negatively charged surface under the electric field that is known as the field emission. [1,2,8] Meanwhile, the atoms on the tips may be ionized and removed from the surface by the fieldinduced evaporation. [9,10] Moreover, the strong Coulomb repulsion between the concentrated charges at the tip may also convert the electrostatic energies in the system to the kinetic energies of the atoms or ions and break the chemical bonding in the system, leading to the Coulomb explosion. [11][12][13] It is well realized that the field evaporation and Coulomb explosion would introduce structural modifications on the sample tips. On the one hand, these structural damages may cause performance degradations and/or even failures of the electron emitters during field emission. [14,15] On the other hand, the field evaporation and Coulomb explosion were considered as the candidates for processing the structures of the nanotips with high precision, [11,16] since they allow manipulation of the sample with atom-by-atom capability. Moreover, the emission of atoms on the sample tips during field evaporation is also utilized in the techniques of FIM and APT to characterize the structure and chemistry of the sample. [7,10] The Coulomb explosion was reported to assist the field evaporation to emit atoms from the sample with poor conductivity during the APT characterizations. [17,18] All these facts suggest that both the Coulomb explosion and field evaporation could be activated and are of importance for the related applications. However, it has not been fully considered and investigated the potential different behaviors (originated from their different physical natures) between Coulomb explosions and field evaporations, such as when the two processes occur respectively, and their different manners of changing the sample structures.Here, we report a dynamic observation of Coulomb explosions and field evaporations in few-layer graphene (FLG) nanoribbons inside a transmission electron microscope (TEM). The Coulomb explosion and field evaporation were activated by applying a positive bias on the FLG nanoribbon. Combined

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Section: Discussionmentioning

confidence: 99%

Dynamic Observation of the Coulomb Explosion and Field Evaporation of a Few‐Layer Graphene Nanoribbon

Wang

et al. 2023

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“…[185] Notably, these effects were only visible for the ultrafast laser pulses, indicating the generation of oxidative species. [186] The doping of TMDs induced by a fs-laser differs from that of graphene. Recently, doping with UDLW was demonstrated in MoS 2 structures.…”

Section: Doping and Energy Band Alignmentmentioning

confidence: 99%

“…[ 185 ] Notably, these effects were only visible for the ultrafast laser pulses, indicating the generation of oxidative species. [ 186 ]…”

Section: Photochemical and Photophysical Effects In Ultrafast Laser P...mentioning

confidence: 99%

Ultrafast Laser Processing of 2D Materials: Novel Routes to Advanced Devices

Emelianov,

Pettersson,

Bobrinetskiy

2024

Advanced Materials

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Ultrafast laser processing has emerged as a versatile technique for modifying materials and introducing novel functionalities. Over the past decade, this method has demonstrated remarkable advantages in the manipulation of 2D layered materials, including synthesis, structuring, functionalization, and local patterning. Unlike continuous‐wave and long‐pulsed optical methods, ultrafast lasers offer a solution for thermal heating issues. Nonlinear interactions between ultrafast laser pulses and the atomic lattice of 2D materials substantially influence their chemical and physical properties. This paper highlights the transformative role of ultrafast laser pulses in maskless green technology, enabling subtractive, and additive processes that unveil ways for advanced devices. Utilizing the synergetic effect between the energy states within the atomic layers and ultrafast laser irradiation, it is feasible to achieve unprecedented resolutions down to several nanometers. Recent advancements are discussed in functionalization, doping, atomic reconstruction, phase transformation, and 2D and 3D micro‐ and nanopatterning. A forward‐looking perspective on a wide array of applications of 2D materials, along with device fabrication featuring novel physical and chemical properties through direct ultrafast laser writing, is also provided.

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“…Laser ablation is a facile and rapid process for the synthesis of CDs in which a laser irradiates carbon targets to remove material from the solid surface. Li et al [ 10 ] fabricated twin graphene quantum dots (GQDs) by the electric-field-assisted temporally shaped femtosecond laser ablation liquid of the graphene dispersion. GQDs with similar size but different oxygen contents and crystallinity were obtained via adjusting the electric field intensity and the pulse delay of the femtosecond laser.…”

Section: Preparation and Modification Of Cdsmentioning

confidence: 99%

Recent Advances in Synthesis, Modification, Characterization, and Applications of Carbon Dots

Pundi

Chang

2022

Polymers

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Although there is significant progress in the research of carbon dots (CDs), some challenges such as difficulty in large-scale synthesis, complicated purification, low quantum yield, ambiguity in structure-property correlation, electronic structures, and photophysics are still major obstacles that hinder the commercial use of CDs. Recent advances in synthesis, modification, characterization, and applications of CDs are summarized in this review. We illustrate some examples to correlate process parameters, structures, compositions, properties, and performances of CDs-based materials. The advances in the synthesis approach, purification methods, and modification/doping methods for the synthesis of CDs are also presented. Moreover, some examples of the kilogram-scale fabrication of CDs are given. The properties and performance of CDs can be tuned by some synthesis parameters, such as the incubation time and precursor ratio, the laser pulse width, and the average molar mass of the polymeric precursor. Surface passivation also has a significant influence on the particle sizes of CDs. Moreover, some factors affect the properties and performance of CDs, such as the polarity-sensitive fluorescence effect and concentration-dependent multicolor luminescence, together with the size and surface states of CDs. The synchrotron near-edge X-ray absorption fine structure (NEXAFS) test has been proved to be a useful tool to explore the correlation among structural features, photophysics, and emission performance of CDs. Recent advances of CDs in bioimaging, sensing, therapy, energy, fertilizer, separation, security authentication, food packing, flame retardant, and co-catalyst for environmental remediation applications were reviewed in this article. Furthermore, the roles of CDs, doped CDs, and their composites in these applications were also demonstrated.

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Preparation of twin graphene quantum dots through the electric-field-assisted femtosecond laser ablation of graphene dispersions

Cited by 7 publications

References 77 publications

Dynamic Observation of the Coulomb Explosion and Field Evaporation of a Few‐Layer Graphene Nanoribbon

Dynamic Observation of the Coulomb Explosion and Field Evaporation of a Few‐Layer Graphene Nanoribbon

Ultrafast Laser Processing of 2D Materials: Novel Routes to Advanced Devices

Recent Advances in Synthesis, Modification, Characterization, and Applications of Carbon Dots

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