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Issue 20, 2019
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Non-equilibrium adatom thermal state enables rapid additive nanomanufacturing

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A new state of radical thermal non-equilibrium in surface adsorbed molecules is discovered that enables rapid surface diffusion of energized adatoms with a negligible effect on the substrate surface temperature. Due to enhanced surface diffusion, growth rates can be achieved that improve the feasibility of many nanofabrication techniques. Since the adatom temperature cannot be directly measured without disturbing its thermodynamic state, the first principle hard-cube model is used to predict both the adatom effective temperature and the surface temperature in response to gaseous particle impingement in a vacuum. The validity of the approach is supported by local, spatially-resolved surface temperature measurements of the thermal response to supersonic microjet gas impingement. The ability to determine and control the adatom effective temperature, and therefore the surface diffusion rate, opens new degrees of freedom in controlling a wide range of nanofabrication processes that critically depend on surface diffusion of precursor molecules. This fundamental understanding has the potential to accelerate research into nanoscale fabrication and to yield the new materials with unique properties that are only accessible with nanoscale features.

Graphical abstract: Non-equilibrium adatom thermal state enables rapid additive nanomanufacturing

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The article was received on 15 Mar 2019, accepted on 29 Apr 2019 and first published on 29 Apr 2019

Article type: Paper
DOI: 10.1039/C9CP01478K
Phys. Chem. Chem. Phys., 2019,21, 10449-10456

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    Non-equilibrium adatom thermal state enables rapid additive nanomanufacturing

    M. R. Henry, S. Kim and A. G. Fedorov, Phys. Chem. Chem. Phys., 2019, 21, 10449
    DOI: 10.1039/C9CP01478K

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