J. Mater. Sci. Technol. ›› 2022, Vol. 117: 174-182.DOI: 10.1016/j.jmst.2021.11.048

• Research Article • Previous Articles     Next Articles

3D printing interface-modified PDMS/MXene nanocomposites for stretchable conductors

Mathias Aakyiira, Brayden Tannera, Pei Lay Yapb, Hadi Rastinc, Tran Thanh Tungb, Dusan Losicb, Qingshi Mengd, Jun Maa,*()   

  1. aUniSA STEM and Future Industries Institute, University of South Australia, South Australia 5095, Australia
    bARC Hub for Graphene Enabled Industry Transformation, School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia 5005, Australia
    cCommonwealth Scientific and Industrial Research Organisation (CSIRO) Manufacturing, Clayton, Victoria 3168, Australia
    dCollege of Aerospace Engineering, Shenyang Aerospace University, Shenyang, Liaoning 110136, China
  • Received:2021-08-15 Revised:2021-10-30 Accepted:2021-11-06 Published:2022-02-17 Online:2022-08-01
  • Contact: Jun Ma
  • About author:∗E-mail address: Jun.Ma@unisa.edu.au (J. Ma).

Abstract:

Additive manufacturing has rapidly evolved over recent years with the advent of polymer inks and those inks containing novel nanomaterials. The compatibility of polymer inks with nanomaterial inks remains a great challenge. Simple yet effective methods for interface improvement are highly sought-after to significantly enhance the functional and mechanical properties of printed polymer nanocomposites. In this study, we developed and modified a Ti3C2 MXene ink with a siloxane surfactant to provide compatibility with a polydimethylsiloxane (PDMS) matrix. The rheology of all the inks was investigated with parameters such as complex modulus and viscosity, confirming a self-supporting ink behaviour, whilst Fourier-transform infrared spectroscopy exposed the inks’ reaction mechanisms. The modified MXene nanosheets have displayed strong interactions with PDMS over a wide strain amplitude. An electrical conductivity of 6.14 × 10-2 S cm-1 was recorded for a stretchable nanocomposite conductor containing the modified MXene ink. The nanocomposite revealed a nearly linear stress-strain relationship and a maximum stress of 0.25 MPa. Within 5% strain, the relative resistance change remained below 35% for up to 100 cycles, suggesting high flexibility, conductivity and mechanical resilience. This study creates a pathway for 3D printing conductive polymer/nanomaterial inks for multifunctional applications such as stretchable electronics and sensors.

Key words: 3D printing, MXene, Nanocomposites, Stretchable conductors