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Strategic Customization of Polymeric Nanocomposites Modified by 2D Titanium Oxide Nanosheet for High‐ k and Flexible Gate Dielectrics
Author(s) -
Jang Moonjeong,
Park Se Yeon,
Kim Seong Ku,
Jung Dowon,
Song Wooseok,
Myung Sung,
Lee Sun Sook,
Yoon Dae Ho,
An KiSeok
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202007213
Subject(s) - materials science , nanocomposite , dielectric , nanosheet , high κ dielectric , composite material , vinyl alcohol , polymer , polymer nanocomposite , percolation threshold , graphene , nanotechnology , optoelectronics , electrical resistivity and conductivity , engineering , electrical engineering
Organic polymer‐based dielectrics with intrinsic mechanical flexibility and good processability are excellent candidates for the dielectric layer of flexible electronics. These polymer films can become even more rigid and electrically robust when modified through cross‐linking processes. Moreover, the composites formed by dispersing nanoscale inorganic fillers in a polymer matrix can exhibit further improved polarization property. However, these strategies can be challenging as homogeneous dispersion of nanomaterials in the matrix is difficult to achieve; thus, degradation of electrically insulating properties of nanocomposite layers is often observed. Here, a high‐ k , pinhole‐free, and flexible poly(vinyl alcohol) (PVA)‐based nanocomposite dielectric is presented, incorporating 2D TiO 2 nanosheets (NSs) for the first time. Despite the attractive dielectric constant, exceptional flexibility, and electrically insulating property of PVA‐TiO 2 nanocomposites, only few studies on these materials have been reported. The organic/inorganic nanosheet hybrid layer, which reaches an unprecedentedly high dielectric constant of 43.8 (more than four times higher than that of cross‐linked PVA), also exhibits an outstanding leakage current density as low as 10 −9 A cm −2 . Furthermore, the repeated bending tests for nanocomposite capacitors reveal their capability of operating without any deterioration of their performances even after 1000 iterations of bending cycles at a bending radius of 3 mm.