Laser Interactions in Nanomaterials Synthesis

Geohegan, David B.; Puretzky, Alexander A.; Rouleau, Christopher M.; Jackson, Jeremy; Eres, Gyula; Liu, Zuqin; Styers-Barnett, David; Hu, Hui; Zhao, Bin; Ivanov, Ilia N.; Xiao, Kai; More, Karren

doi:10.1007/978-3-642-03307-0_1

Cited by 6 publications

(5 citation statements)

References 28 publications

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“…By adding 5−50 mTorr of argon, the plasma plume was decelerated controllably to tune the maximum KE of species arriving at the substrate from 42 eV/atom in vacuum, to <1 eV/atom at 100 mTorr. The plume deceleration followed a standard a = −αv 2 drag model (Figures 1c, S1); 26,27 however, the small deceleration coefficient compared to typical atomic and molecular plasmas, 25 along with its highly forward-directed angular distribution and weak luminescence, implied that its main constituents were clusters. 26,27 Laser desorption/ionization time-of-flight mass spectrometry (Figure S2) revealed that the plume is composed principally of clusters ranging from Se 2 to Se 9 , consistent with prior measurements for laser-vaporized Se.…”

Section: Resultsmentioning

confidence: 86%

“…The plume deceleration followed a standard a = −αv 2 drag model (Figures 1c, S1); 26,27 however, the small deceleration coefficient compared to typical atomic and molecular plasmas, 25 along with its highly forward-directed angular distribution and weak luminescence, implied that its main constituents were clusters. 26,27 Laser desorption/ionization time-of-flight mass spectrometry (Figure S2) revealed that the plume is composed principally of clusters ranging from Se 2 to Se 9 , consistent with prior measurements for laser-vaporized Se. 28,29 The weakly ionized plasma travels at maximum velocities of ∼1 cm/μs in vacuum (Figure 1b) and is only weakly luminescent until arrival at the substrate, where collisions within the boundary layer result in comparatively brighter emission.…”

Section: Resultsmentioning

confidence: 86%

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Low Energy Implantation into Transition-Metal Dichalcogenide Monolayers to Form Janus Structures

et al. 2020

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Atomically thin two-dimensional (2D) materials face significant energy barriers for synthesis and processing into functional metastable phases such as Janus structures. Here, the controllable implantation of hyperthermal species from pulsed laser deposition (PLD) plasmas is introduced as a top-down method to compositionally engineer 2D monolayers. The kinetic energies of Se clusters impinging on suspended monolayer WS2 crystals were controlled in the <10 eV/atom range with in situ plasma diagnostics to determine the thresholds for selective top layer replacement of sulfur by selenium for the formation of high quality WSSe Janus monolayers at low (300 °C) temperatures and bottom layer replacement for complete conversion to WSe2. Atomic-resolution electron microscopy and spectroscopy in tilted geometry confirm the WSSe Janus monolayer. Molecular dynamics simulations reveal that Se clusters implant to form disordered metastable alloy regions, which then recrystallize to form highly ordered structures, demonstrating low-energy implantation by PLD for the synthesis of 2D Janus layers and alloys of variable composition.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 86%

Low Energy Implantation into Transition-Metal Dichalcogenide Monolayers to Form Janus Structures

et al. 2020

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“…SWCNHs are very much like carbon nanotubes, but are much more amenable to processing techniques. SWCNTs, for example, can be synthesized by the same laser ablation approach, but the process requires metal catalysts such as Ni, Co, or Fe that are relatively difficult to remove [43,44]. As-synthesized SWCNHs do not require purification; they are nonreactive and nontoxic, and are extremely robust to withstand very high temperatures and pressures.…”

Section: Synthesis and Characterization Of Single-walled Carbon Nanohmentioning

confidence: 99%

Interaction of carbon nanohorns with plants: Uptake and biological effects

Lahiani

Chen

Irin

et al. 2015

Carbon

203

109

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Single-Walled Carbon Nanohorns (SWCNHs) are a unique carbon-based nanomaterial with promising application in different fields including, medicine, genetic engineering and horticulture. Here, we investigated the biological response of six crop species (barley, corn, rice, soybean, switchgrass, tomato) and tobacco cell culture to the exposure of SWCNHs. We found that SWCNHs can activate seed germination of selected crops and enhance growth of different organs of corn, tomato, rice and soybean. At cellular level, growth of tobacco cells was increased in response to exposure of SWCNHs (78% increase compared to control). Uptake of SWCNHs by exposed crops and tobacco cells was confirmed by transmission electron microscopy (TEM) and quantified by microwave induced heating (MIH) technique. At genetic level, SWCNHs were able to affect expression of a number of tomato genes that are involved in stress responses, cellular responses and metabolic processes. We have concluded that SWCNHs can be used as plant growth regulators and have the potential for plant-related applications.

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“…where R 0 indicates the distance at which plasma propagation ceases (stopping distance) and β is a slowing coefficient. If the drag force is taken proportional to the square of particle velocity (a = −αv 2 , v 2 -drag model [21]) the expansion law is…”

mentioning

confidence: 99%

On the role of the ablated mass on the propagation of a laser-generated plasma in an ambient gas

Spadaro¹,

Fazio²,

Neri³

et al. 2015

EPL

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We investigate the influence of the ablated mass on the dynamics of a laser-generated plasma expanding in an ambient gas. A laser-generated silver plasma expanding in argon was analysed by fast photo imaging. While keeping all relevant experimental parameters fixed, we changed the ablated mass per pulse, by changing the laser spot area at the target surface. We show that at fixed laser fluence, plasma dynamics undergoes dramatic changes as a function of the ablated mass per pulse. Plasma expansion dynamics is studied using drag, v 2 -drag, mixed propagation and Predtechensky-Mayorov models. Results show that, at a given laser fluence, when a shock wave forms, plasma dynamics is unequivocally determined by the ratio between the ablated mass per pulse and the gas density. Such a dynamics critically affects the kinetic energy at landing and the nanostructure resulting upon mutual assembling on the substrate of the deposited nanoparticles. Thus both the ablated mass per pulse and the laser fluence are to be known to control the nanostructure formation.

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Laser Interactions in Nanomaterials Synthesis

Cited by 6 publications

References 28 publications

Low Energy Implantation into Transition-Metal Dichalcogenide Monolayers to Form Janus Structures

Low Energy Implantation into Transition-Metal Dichalcogenide Monolayers to Form Janus Structures

Interaction of carbon nanohorns with plants: Uptake and biological effects

On the role of the ablated mass on the propagation of a laser-generated plasma in an ambient gas

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