Robust Conductive Micropatterns on PTFE Achieved via Selective UV-Induced Graft Copolymerization for Flexible Electronic Applications

Abstract

Fabrication of stable and functional patterns on the surface of PTFE remains a great technical challenge owing to its inertness and high hydrophobicity. Here, we report for the first time the fabrication of functional micropatterns on the PTFE surface by selectively irradiating plasma-treated PTFE coated with the monomer solution. A series of uniform highly dense poly­(dopamine methacrylamide) (denoted as PDMA) line patterns with line/pitch widths of 20/20 and 50/50 μm are fabricated on the surface of PTFE (denoted as PDMA-p/PTFE) using dopamine methacrylamide (DMA) as the monomer. Surface graft copolymerization occurs and is attributed to the universal adsorption of DMA and the low grafting energy barrier, compared with the polymerization energy barrier, which is also demonstrated by the DFT calculations. Further, robust well-defined metal Ag or Cu patterns with strong adhesion strength are fabricated on the surface of the PTFE film by electroless deposition and are demonstrated for applications in flexible electronics. The approach is demonstrated to be versatile for fabrication of PDMA micropatterns onto a wide range of polymeric substrates, including polypropylene and acrylonitrile butadiene styrene.

Local environment-mediated efficient electrocatalysis of CO2 to CO on Zn nanosheets

“…The FTIR spectra of Zn NS- x % PTFE ( x = 4, 8 and 16) displayed two C–F bond vibration peaks at 1146 and 1201 cm −1 (Fig. 2b), 39,40 meanwhile C–F bonds did not appear with the clean carbon paper and Zn NS without PTFE modification, confirming that the C–F bonds only originated from PTFE modified on the surface of Zn NS. Furthermore, the XPS spectra of Zn 2p also proved the deposition of metal Zn on carbon paper (Fig.…”

Self-cleaning expanded polytetrafluoroethylene-based hybrid membrane for water filtration

“…1a shows, infrared absorption at 1714 cm −1 appears in the spectrum of ePTFE film grafted with PAA (PAA–ePTFE), which is related to the stretching vibration of carbonyl groups, indicating that PAA chains have been successfully grafted onto ePTFE surface. 26,27 After compositing with TiO 2 , the vibration and stretching of Ti–O bond appeared at 800 to 500 cm −1 in the spectrum of TiO 2 –PAA–ePTFE. 25,28 In addition, a wide peak around 3300 cm −1 caused by Ti–OH interaction and surface absorbed water has also been observed.…”

Self-Powered Memory Systems

“…In addition, because of its good sealing properties, PTFE is also commonly used as a substrate for many electronic devices and containers. In particular, PTFE generally exhibits a significant negative polarity in triboelectric nanogeneration. − It is considered a very suitable friction material and is usually used in the development of electronic skin. − …”