Strategic Customization of Polymeric Nanocomposites Modified by 2D Titanium Oxide Nanosheet for High‐k and Flexible Gate Dielectrics

Abstract

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 TiO2 nanosheets (NSs) for the first time. Despite the attractive dielectric constant, exceptional flexibility, and electrically insulating property of PVA‐TiO2 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.

Boosted dielectric performance of organic–inorganic nanocomposites based on BaTiO3 via 2D TiO2 templates

“…Each neutralized and dried precipitate sample was ground using a pestle and mortar and packed into an XRD sample holder. In the spectra of the TiO 2 nanosheets, after the 1st synthesis, peaks at 28.4 • , 48.3 • , and 62.0 • were assigned to the (002), (020), and (313) crystallographic planes of the TiO 2 nanoshsets, respectively [4,14]. The peak at 24.5 • was attributed to NTO (Na 2 Ti 6 O 13 ) as sodium ions were adsorbed into TiO 2 surfaces as the intercalant.…”

“…Organic polymer-based dielectrics allow compatibility with direct fabrication of field-effect transistors (FETs) on plastic substrates owing to their inherent mechanical flexibility and the ease of processing at low temperatures [1][2][3][4]. Despite the many encouraging properties, their mutually correlated drawbacks involving low film density, low k values, and large leakage current greatly impede further material development.…”

Scalable co-cured polyimide/poly(p-phenylene benzobisoxazole) all-organic composites enabling improved energy storage density, low leakage current and long-term cycling stability

“…Recently, dielectric polymers are receiving ever-increasing attention due to their high breakdown strength (E b ), high temperature tolerance and excellent energy density storage (U e ) characteristics for advanced power and electrical equipment, [1][2][3][4] and electronic devices such as polymer-based film capacitors and gate dielectrics. [5][6][7][8] Currently, the main method is focused on adding ceramic nanoparticles with a giant dielectric constant into dielectric polymers to form inorganic-organic nanocomposites and substantially enhance the comprehensive dielectric properties. 9,10 However, compared to all-organic composites, the inorganic-organic nanocomposite dielectric materials usually result in obvious dielectric loss.…”

Gold Nanoparticles as Effective ion Traps in Poly(dimethylsiloxane) Cross-Linked by Metal-Ligand Coordination

“…Such a modification made it possible to manufacture low-voltage organic thin-film transistors with suitable bending stability. Other works describe the application as a gate dielectric of a variety of composite materials: polyvinyl alcohol/SiO 2 [ 5 ], ZrTiHfO 2 -PVP [ 6 ], poly(vinyl alcohol)/2D TiO 2 nanosheets [ 7 ], as well as block copolymer elastomers [ 8 , 9 ].…”