Phase transition between cubic-BN and hexagonal BN upon pulsed laser induced liquid–solid interfacial reaction

Liu, Q.X; Yang, Guowei; Zhang, J.X

doi:10.1016/s0009-2614(03)00580-3

Cited by 32 publications

(14 citation statements)

References 18 publications

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“…11 As a result, LAL is a potential strategy for trapping of metastable phases and shapes of nanostructures at ambient conditions. [25][26][27][28][29][30][31][32] However, traditional LAL face a fundamental issue: how to control the formation of the metastable phase and the shape of nanocrystals in the synthesis. Based on previous investigations, for this issue, we applied an electric field into LAL to control the forming phase and shape of nanocrystals synthesized by LAL.…”

Section: Metastable Phase and Shape Trapping By Electrical Field Assi...mentioning

confidence: 99%

“…[19][20][21][22][23][24] For instance, researchers first selected diamond nanoparticles as the synthesized object by using LAL, [25][26][27][28] because one side that the properties of diamond are quite extreme compared with that of other materials, and another side that the synthesis of diamonds under conditions of normal temperature and pressure is not predicted by the equilibrium thermodynamic phase diagram of carbon. Accordingly, laser ablation of a solid target in a confined liquid has been demonstrated to be an effective and general route toward nanocrystal and nanostructure synthesis, especially for synthesizing nanocrystals with metastable phases, such as diamond and related materials, [29][30][31][32] and an immiscible alloying phase. 33 In the past decade, there have been many investigations involved in the size control of metallic nanoparticles (note that in some investigations the synthesis of nanoparticles by laser ablation is called laser ablation synthesis (LAS)), [34][35][36] colloid formation with the influence of laser wavelength and focus, [37][38][39] and nanostructure fabrication upon laser ablation of a solid target in liquid.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

From nanocrystal synthesis to functional nanostructure fabrication: laser ablation in liquid

Liu¹,

Cui²,

Wang³

et al. 2010

Phys. Chem. Chem. Phys.

129

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Although nanomaterials investigations have been carried over the recent decades, researchers still face a fundamental challenge: how to control the phase, size and shape of nanocrystals in the synthesis of nanomaterials, i.e., how to achieve the transformation from nanocrytsal synthesis to functional nanostructure fabrication. For this issue, we, in this review, introduce recent developments in laser ablation in liquid (LAL) for the synthesis and fabrication of novel nanostructures with metastable phases and shapes. Laser ablation of solid targets in liquid has actually opened a door toward to synthesize nanocrystals and fabricate nanostructures due to these advantages as follows: (i) LAL is a chemically "simple and clean" synthesis due to the process with reduced byproduct formation, simpler starting materials, no need for catalyst, etc. (ii) Under ambient conditions, not extreme temperature and pressure, a variety of metastable phases that may not usually be attainable, can be generated by mild preparation methods. (iii) New phase formation involves in both liquid and solid upon LAL, which allows researchers to choose and combine interesting solid target and liquid to synthesize nanocrystals and fabricate nanostructures of new compounds for purpose of fundamental research and potential applications. (iv) The phase, size and shape of the synthesized nanocrystals can be readily controlled by tuning laser parameters and applying assistances such as inorganic salts or electrical field upon LAL. For example, we have synthesized the micro- and nanocubes of carbon with C(8)-like structures by the inorganic salts assisted LAL, and the micro- and nanocubes and spindles of GeO(2) by the electrical field assisted LAL. Additionally, we have developed a new technique to fabricate functional nanopatterns on the basis of the pulsed-laser deposition in liquid. Accordingly, LAL could greatly extend its application in fabrication of functional nanostructures in the future.

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Section: Metastable Phase and Shape Trapping By Electrical Field Assi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

From nanocrystal synthesis to functional nanostructure fabrication: laser ablation in liquid

Liu¹,

Cui²,

Wang³

et al. 2010

Phys. Chem. Chem. Phys.

129

View full text Add to dashboard Cite

show abstract

“…[113][114][115][116][117][118] Investigation of these crystal phase transitions, while maintaining the same material composition, has to other inorganic layered structures, including metallic bismuth [119] MoOx [120], In2Se3 sheets [121], Zinc sulfates (ZDHS) [122], Ge2Sb2Te5 2D films [123], and many other transition metal chalcogens with layered structures [25]. This phase transformed 1T-MoS2 has significantly different electronic, as well as chemical properties than the bulk 2H-MoS2.…”

Section: Phase Transformation In 0d Chalcogenidesmentioning

confidence: 99%

Phase transformation studies of metal oxides to dichalcogenides in 1-d structures.

Cummins¹,

Ray²

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Recently, the use of materials with nanoscale morphologies has expanded, particularly with applications in energy conversion, catalysis, and energy storage. One drawback to single crystalline nanomaterials, especially 1D nanowires, is the difficulty in synthesizing these compounds, as the material chemistry becomes more complicated.Metal oxide nanowires can be synthesized easily and can be produced in relatively large quantities. However, more complex materials, such as metal chalcogenides, cannot typically be synthesized using facile methods, and currently very few techniques involve scalable methods. Phase transformation of metal oxides nanowires to form metal sulfides and selenides by gas-solid reactions is one viable route to scalable chalcogenide production. However, the transformation of 1D materials from oxides to other compositions using gas-solid reactions has not been well studied and the underlying mechanisms involved with phase transformation are minimally understood. A fundamental understanding of how gas phase reactants interact with nanomaterials is critical to not only making new materials on the nanoscale, but also allowing the engineering and optimization of nanomorphologies for functional applications.v Iron sulfide and molybdenum sulfide nanowires are chosen as the two model materials to investigate crystal phase transformations in 1D systems.In reaction of Fe2O3 single crystal nanowires with H2S gas to form FeS, the formation of a hollow nanotube morphology is observed, caused by unequal diffusion of the cation and anion, resulting in the accumulation of voids. These findings suggest that the reactant (sulfur) does not diffuse into the nanostructure; rather, iron atoms diffuse outward and react on the surface. The resulting FeS compound also has interesting optical absorption properties that could be of use in solar applications.The conversion of MoO3 nanowires in an attempt to form MoS2 nanowires resulted in a MoS2/MoOx shell/core nanowire morphology, with strong diffusion limits in formation of the sulfide shell. In this case, the sulfur diffusion through the MoS2 shell limits the reaction, leading to core-shell morphology.The MoS2/MoOx shell/core architecture shows considerable activity for electrocatalysis of the hydrogen evolution reaction due to the high surface area architecture for edge plane sites. Chemical intercalation of the MoS2 shell shows a further change in the crystal morphology and an improvement in catalytic activity. Reducing agents (hydrazine) are also investigated in attempts to chemically modify the MoS2 surface, changing the surface charge carrier concentrations. This is the first report of the effect of hydrazine in any chalcogenide system and the hydrazine treated MoS2 nanowire architecture shows one of the best electrocatalytic performance to date. The chemical modifications of MoS2 1D structures suggest the electrocatalytic activity can be tuned and corresponding architectures could be synthesized through phase transformation by design. These experiments help to d...

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“…It was reported cBN undergoes phase transition to hBN at about 1800 K in the nitrogen atmosphere [11][12]. During laser heating, cBN transforms to hBN and then hBN gradually decomposes into gaseous nitrogen and gaseous boron at 2400 to 2600 K [13][14], leading to groove formation. Finally crack initiation occurred at the transition zone, primarily due to thermal expansion mismatch stresses of BN phases.…”

Section: Figmentioning

confidence: 99%

“…First is the initiation stage, where the groove was initiated by phase transformation and chemical reaction after laser irradiation. It was reported cBN undergoes phase transition to hBN at about 1800 K in the nitrogen atmosphere [13,14]. It is also mentioned that AlN began to oxidize at 1073 K and transformed entirely above 1273 K. Second is the groove formation stage, where hBN decomposed and the binder (AlN) reacted in air atmosphere simultaneously.…”

Section: Effect Of Assisted Fluid Mediamentioning

confidence: 99%

Crack separation mechanism applied in CO2 laser machining of thick Polycrystalline Cubic Nitride (PCBN) tool blanks

Wang

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Phase transition between cubic-BN and hexagonal BN upon pulsed laser induced liquid–solid interfacial reaction

Cited by 32 publications

References 18 publications

From nanocrystal synthesis to functional nanostructure fabrication: laser ablation in liquid

From nanocrystal synthesis to functional nanostructure fabrication: laser ablation in liquid

Phase transformation studies of metal oxides to dichalcogenides in 1-d structures.

Crack separation mechanism applied in CO2 laser machining of thick Polycrystalline Cubic Nitride (PCBN) tool blanks

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