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Laser ablation synthesis in solution (LASiS) is a commonly used method for obtaining colloidal solution of nanoparticles in a variety of solvents. [ 1 ] [ 2 ] Nanoparticles (NPs,), are useful in chemistry, engineering and biochemistry due to their large surface-to-volume ratio that causes them to have unique physical properties. [ 3 ]
Laser ablation or photoablation (also called laser blasting [1] [2] [3]) is the process of removing material from a solid (or occasionally liquid) surface by irradiating it with a laser beam. At low laser flux, the material is heated by the absorbed laser energy and evaporates or sublimates .
The synthesis efficiency is about 100 times higher than for the laser ablation method. The time required to make SWNT forests of the height of 2.5 mm by this method was 10 minutes in 2004. Those SWNT forests can be easily separated from the catalyst, yielding clean SWNT material (purity >99.98%) without further purification.
CO 2 laser ablation technique is utilized to produce the first SWNHs at room temperature in absence of a metal catalyst. The CO 2 laser ablation generator is composed of a high-power CO 2 laser source (with a wavelength of 10.6 μm, 5 kW of power, 10 nm of beam diameter, and the pulse width varies from 10 ms to continuous illumination) and a plastic-resin reaction chamber attached with a ...
When such a laser pulse is adsorbed by a solid target, material from the surface region of the target absorbs the laser energy and either (a) evaporates or sublimates from the surface or is (b) converted into a plasma (see laser ablation). These particles are easily transferred to the substrate where they can nucleate and grow into nanowires.
The catalyst particles obtained by laser ablation of a cobalt target sorted by size ultimately allow to grow a CNT density around 10 12 CNT cm −2 using a multistep process using plasma and catalyst particles around 4 nm. In spite of these efforts, the electrical resistance of such via is 34 Ω _for a 160 nm diameter.
Nanomanufacturing refers to manufacturing processes of objects or material with dimensions between one and one hundred nanometers. [15] These processes results in nanotechnology, extremely small devices, structures, features, and systems that have applications in organic chemistry, molecular biology, aerospace engineering, physics, and beyond. [16]
All well-established techniques of carbon nanotube growth, such as arc-discharge, [3] [14] laser ablation [15] [16] and chemical vapor deposition, [17] are used for mass-production of BN nanotubes at a tens of grams scale. [13] BN nanotubes can also be produced by ball milling of amorphous boron, mixed with a catalyst (iron powder), under NH 3 ...