Self-cleaning and fully polymer-based super-moisture-resistant gas barrier coating films with 2D polymers for flexible electronic devices and packaging applications

Sadiq Mahmood, Nadeem Ahamad, Chandra Kant, Amir Khan, Pu Wei Wu, Wen Bin Jian, Chih Wei Chu, Monica Katiyar*, Hong Cheu Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this report, we developed fully polymer-based and completely solution-processed moisture-resistant gas-diffusion-barrier-films (GDBFs) by utilizing a 2D polymer (2DP), polydimethylsiloxane (PDMS) and self-healing elastomeric SB-PDMS (i.e., Schiff base-linked PDMS) films. Through alternate stacking of spray-coated 2DP and spin-coated PDMS on polyethylene terephthalate (PET) substrates, multiple assemblies of bi-layers (BL)n (where n = 1, 2, 3 or 4) have been designed. Self-healing elastomeric SB-PDMS was coated on the other side of the PET substrate to introduce self-cleaning and self-healing properties to the newly fabricated GDBFs. The low BET surface area of ca. 5.16 m2 g−1 indicated that the stacking of 2DP materials did not align the pores or rings within the molecule. Moreover, the XRD results of spray-coated 2DP films confirmed that the molecules of 2DP with high-layer crystallinities were oriented parallel to the substrate. The water vapor transmission rate (WVTR) value was improved from 1.4 g m−2 day−1 for PET to the optimum value of 8.5 × 10−4 g m−2 day−1 for SB-PDMS/PET/(BL)4 containing four bilayers of 2DP/PDMS films, which did not degrade even after 1000 bending cycles. Accordingly, we developed flexible GDBFs with excellent moisture barrier properties along with additional functionalities (such as self-cleaning) to enable roll-to-roll processing of large-area flexible thin films for flexible organic-electronic device applications.

Original languageEnglish
Pages (from-to)15907-15917
Number of pages11
JournalJournal of Materials Chemistry C
Volume11
Issue number45
DOIs
StatePublished - 18 Oct 2023

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