Atmospheric-pressure dielectric barrier discharge with capillary injection for gas-phase nanoparticle synthesis

作者：Ghosh Souvik^*; Liu Tianqi; Bilici Mihai; Cole Jonathan; Huang I Min; Staack David; Mariotti Davide; Sankaran R Mohan

来源：Journal of Physics D: Applied Physics , 2015, 48(31): 314003.

DOI：10.1088/0022-3727/48/31/314003

• dielectric barrier discharge
• atmospheric-pressure plasma
• nanoparticle
• homogeneous nucleation
• aerosol

We present an atmospheric-pressure dielectric barrier discharge (DBD) reactor for gas-phase nanoparticle synthesis. Nickel nanoparticles are synthesized by homogenous nucleation from nickelocene vapor and characterized online by aerosol mobility measurements. The effects of residence time and precursor concentration on particle growth are studied. We find that narrower distributions of smaller particles are produced by decreasing the precursor concentration, in agreement with vapor nucleation theory, but larger particles and aggregates form at higher gas flow rates where the mean residence time should be reduced, suggesting a cooling effect that leads to enhanced particle nucleation. In comparison, incorporating a capillary gas injector to alter the velocity profile is found to significantly reduce particle size and agglomeration. These results suggest that capillary gas injection is a better approach to decreasing the mean residence time and narrowing the residence time distribution for nanoparticle growth by producing a sharp and narrow velocity profile.

• 出版日期2015-8-12