Influence of DBD Inlet Geometry on the Homogeneity of Plasma‐Polymerized Acrylic Acid Films: The Use of a Microplasma–Electrode Inlet Configuration

Abstract

Multiple vapor inlet systems have been developed to enhance the homogeneity of deposited polyacrylic acid films via medium and atmospheric pressure plasma technology. Different inlet systems were experimentally tested and optical reflectance spectrometry (OPS) was used to measure the differences in thickness of the films along the exposed surface. Standard deviations of more than 65% were reduced to less than 10%. COMSOL models point to the gas flow as the main contributor to the film homogeneity. OPS analysis of the best set‐up shows a linear relationship between thickness and exposure time (100–200 nm/min). XPS C1s deconvolution indicates a preservation of +50% of the –COOH groups and a significant incorporation of other oxygen containing groups.

Deposition of Plasma‐Polymerized Polyacrylic Acid Coatings by a Non‐Equilibrium Atmospheric Pressure Nanopulsed Plasma Jet

“…Even if DBD reactors have been previously shown to possibly result in the deposition of scarcely homogeneous pPAA coatings, [14] it was recently demonstrated that this problem can be overcome by optimizing the design of the precursor inlet systems. [15] On the other hand, results of previous works on pPAA deposition [16][17][18] showed that in the AP-DBD system the effect of monomer fragmentation on the retention of -COOH groups turns out to be relevant: the higher the monomer fragmentation, the lower the amount of -COOH groups on the coated substrate, [16,19] as also experimentally evidenced by Palumbo et al [19] through a correlation of optical emission spectroscopy and X-ray photoelectron spectroscopy results.…”

Atmospheric Pressure Microwave Plasma Jet for Organic Thin Film Deposition

“…Moreover, information on the distribution of the monomer in the volume close to the substrate was also able assist in evaluating the thin film growth during the deposition process. For example, it has already been shown that the gas velocity and mass fraction can be correlated to the deposition pattern on a substrate [39] and the plasma behavior [35]. In the latter study it was also revealed that placing an additional plate at the edge of the plasma jet capillary intensified the gas purity near the surface when working with a small gap distance to the substrate [35].…”

Adhesion improvement at the PMMA bone cement-titanium implant interface using methyl methacrylate atmospheric pressure plasma polymerization

“…A DBD parallel plate set-up, with helium as carrier gas, will be used in this work since this reactor set-up has already been thoroughly studied and is proven to be very successful for several applications, including the deposition of coatings [13,34,35]. …”