Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Hugo Hartl, Wenshao Li, Thomas Danny Michl, Raveendra Anangi, Robert Speight, Krasimir Vasilev, Kostya Ken Ostrikov, Jennifer MacLeod

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Abstract

This work reveals a versatile new method to produce films with antimicrobial properties that can also bond materials together with robust tensile adhesive strength. Specifically, we demonstrate the formation of coatings by using a dielectric barrier discharge (DBD) plasma to convert a liquid small-molecule precursor, m-cresol, to a solid film via plasma-assisted on-surface polymerisation. The films are quite appealing from a sustainability perspective: they are produced using a low-energy process and from a molecule produced in abundance as a by-product of coal tar processing. This process consumes only 1.5 Wh of electricity to create a 1 cm2 film, which is much lower than other methods commonly used for film deposition, such as chemical vapour deposition (CVD). Plasma treatments were performed in plain air without the need for any carrier or precursor gas, with a variety of exposure durations. By varying the plasma parameters, it is possible to modify both the adhesive property of the film, which is at a maximum at a 1 min plasma exposure, and the antimicrobial property of the film against Escherichia coli, which is at a maximum at a 30 s exposure.

Original languageEnglish
Article number7560
Number of pages10
JournalScientific Reports
Volume12
Issue number1
DOIs
Publication statusPublished - 9 May 2022

Keywords

  • Design, synthesis and processing
  • Surfaces, interfaces and thin films

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