Abstract:
The conditions of aerodynamic focusing of aerosol flows compressed by a flow of enclosing gas are analyzed under conditions of contactless aerosol printing with dry metal nanoparticles and microsized ink drops to form small-width lines on substrates. Numerical estimates show that in the processes of movement to the substrate after exiting the nozzle of spherical metal nanoparticles with average sizes more than 70 nm, the Stokes numbers are sufficiently high and the deviations of their trajectories from the flow axis are less than 1 $\mu$m, which confirms the possibility of using aerodynamic focusing for printing with dry nanoparticles. Aerosol printing of dry quasi-spherical Au nanoparticles produced arrays in the form of lines with a width of about 30 $\mu$m, which demonstrated high plasmon enhancement of the Raman spectrum of low concentrations of the BPE (1,2-bis(4-pyridyl)ethylene) dye of more than 2 $\cdot$ 10$^4$. Aerosol printing of quasi-spherical Ag nanoparticles with simultaneous laser sintering made it possible to form monolithic highly conductive microstructures with a sufficiently low specific resistance, exceeding the specific resistance of coarse-crystalline silver by only 2.2 times.
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