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Growth process

How a “growth process” nanoworkshop works?

The growth of nanotubes or nanowires is obtained by chemical vapor deposition in a confined reactor. The break down of the substrate (preparation) may disperse a few particles. Some characterization techniques can damage the sample. The daily cleaning is done with the reactor closed, but some maintenance with the reactor open are needed each year. The particles/substrate liaison of the samples is high (low risk of inhalation) provided shocks, destruction, or contacts are avoided. The operations of transfert of samples are therefore done with shields and their destruction are made with waste elimination.

How nanotube or nanowire growth works?

175_croissance_metal

Catalyst position and growth type.

SEM image of Ni nanowires [N.M. Mohamed, Diamond and Related Materials 65 (2016) 59-64].

The thermal decomposition, for example of a carbonaceous gas, enables the adsorption of carbon on a metal-catalyst (Ni, Fe, Co, Au) nanoparticle. The growth of one-dimensional nanostructures (tubes or threads) takes place either above the nanoparticle placed on the support, or underneath, with the nanoparticle held at the end of the one-dimensional structure.

Comment est réalisée la croissance d'un tube ou d'un