Facile preparation of high dielectric flexible films based on titanium dioxide and cellulose nanofibrils

Flexible high dielectric thin films based on cellulose nanofibrils and acid oxidized multi-walled carbon nanotubes

“…The rst degradation stage is the slight weight loss before 100 C, resulting from the evaporation of absorbed water. 13 The weight loss of CNF/o-MWCNT (6.2 wt%) slightly decreased from 2.02% to 1.82%. It indicates that the introduction of oxide-containing groups helps to decrease absorbed moisture.…”

“…Commonly used llers for nanocellulose based high dielectrics are ceramic llers (e.g., barium titanate, 12 titanate dioxide 13 ) and conductive llers (e.g., silver nanowires, 3,14 graphene, [15][16][17][18] triglycine sulfate (TGS), [19][20][21][22] polyaniline (PANI), 23,24 carbon nanotubes 25 ). High dielectric nanocellulose/ceramic composites usually demand high ller loading (>50 wt%), leading to severe agglomerations, poor mechanical properties, and low breakdown strength.…”

“…Our previous study shows that CNF is a better choice than TCNF, considering its lower loss tangent and higher energy efficiency. 13 Thus, CNF was used as the matrix. The results show that acid oxidized MWCNTs (o-MWCNTs) have good distribution in the CNF matrix, and the CNF/o-MWCNT exhibits excellent dielectric properties and thermal stabilities.…”

High dielectric thin films based on barium titanate and cellulose nanofibrils

“…It is worth to note that the rolled CNF/ BTO-B lms still showed higher dielectric properties compared with other reported composites. 42 And at high frequency, the difference of 3 r and tan d between these samples are much smaller, which suggests the possibility of the exible CNF/BTO lm to be utilized in the high-frequency applications such as antenna.…”

“…In our previous study, titanium dioxide (TiO 2 ) was used as the ller, and the dielectric properties of CNF/TiO 2 and TCNF/TiO 2 nanocomposite were compared. 42 It was found that CNF is a better choice than TCNF as the high dielectric matrix for the sake of reliability and energy saving. With 50 wt% of TiO 2 loaded, the 3 r of the CNF/TiO 2 nanocomposite lms is 19.51 with a tan d of 0.81.…”