Preparation and characterizations of tantalum pentoxide (Ta₂O₅) nanoparticles and UV‐curable Ta₂O₅‐acrylic nanocomposites

Abstract

Tantalum pentoxide (Ta 2 O 5 ) nanoparticles with the sizes in the range of 20-50 nm were prepared via a chemical route in which the oleic acid (OLEA) was adopted as the surfactant for the synthesis process. X-ray diffraction (XRD) revealed the as-synthesized Ta 2 O 5 transforms from amorphous to hexagonal and orthorhombic structures at the temperatures of 700 C and 750 C, respectively, illustrating the suppression of recrystallization temperature of Ta 2 O 5 due to the particle size reduction. UV-curable nanocomposites containing the Ta 2 O 5 nanoparticles and acrylic matrix were also prepared. Thermogravimetry analysis (TGA) found an about 10-20 C improvement on the 5% weight-loss thermal decomposition temperatures (T d s). Dielectric measurement showed that the dielectric constant of nanocomposite increases with the increase in the filler loading without severe deterioration of dielectric loss. The increment of dielectric constants was ascribed to the addition of high-dielectric inorganic fillers as well as the presence of interfacial polarization at the organic/inorganic interfaces.

Transparent Flash Memory Using Single Ta2O5 Layer for Both Charge-Trapping and Tunneling Dielectrics

“…Figure b shows the Ta 4f core level spectra with two distinct peaks corresponding to Ta 4f 7/2 and Ta 4f 5/2 at 26.4 and 28.29 eV, respectively, where spin–orbit splitting between Ta 4f 7/2 and Ta 4f 5/2 photoelectrons was found to be about 1.89 eV. This value reflects the strong binding between the tantalum and oxygen atoms, which is in good agreement with the previously reported XPS results by several other groups. , These two peaks represent the characteristics of Ta–O bonding . The Ta 4f spectrum shows a small and broad peak at 22.5 eV with a negligible intensity that forms a tail at the lower energy side of the main peak, which is characteristic of metallic Ta .…”

“…This value reflects the strong binding between the tantalum and oxygen atoms, which is in good agreement with the previously reported XPS results by several other groups. 25,26 These two peaks represent the characteristics of Ta−O bonding. 27 The Ta 4f spectrum shows a small and broad peak at 22.5 eV with a negligible intensity that forms a tail at the lower energy side of the main peak, which is characteristic of metallic Ta.…”

Stokes and Anti-Stokes Luminescent Rare-Earth-Doped Tantalum Oxide Nanoparticles

“…45 The recrystallization temperature of β-Ta 2 O 5 is in the range of 800−1000 °C. 46 The phase transformation from hexagonal into orthorhombic is evidenced by the splitting of the hexagonal phase peak at 2θ = 50.35°(1,1,0) into two orthorhombic phase peaks at 2θ = 49.75°(0,22,0) and 2θ = 50.70°(2,15,1) as well as the emergence of a new diffraction peak at 2θ = 44.75° (3,4,0). 47 Therefore, we synthesized undoped, Eu-doped, and Er,Ybcodoped Ta 2 O 5 NPs.…”

“…The most common polymorphs in L-Ta 2 O 5 (more relevant for bioapplications) are hexagonal δ-Ta 2 O 5 and orthorhombic β-Ta 2 O 5 . The recrystallization temperature of β-Ta 2 O 5 is in the range of 800–1000 °C . The phase transformation from hexagonal into orthorhombic is evidenced by the splitting of the hexagonal phase peak at 2θ = 50.35° (1,1,0) into two orthorhombic phase peaks at 2θ = 49.75° (0,22,0) and 2θ = 50.70° (2,15,1) as well as the emergence of a new diffraction peak at 2θ = 44.75° (3,4,0) …”

Electrical characteristics of Al₂O₃ and Ta₂O₅ nanoparticles synthesized by DC anodic ARC-discharge in water

“…[1,2] In that context, particles at the critical scale of matter under 100 nm are currently studied extensively. Especially, alumina (Al 2 O 3 ) and tantalum pentoxide (Ta 2 O 5 ) are widely used nanoparticles (NPs) for composite insulations [3][4][5][6][7][8] and we recently reported on a quite simple, environmentally-friendly, surfactant-free, cost-effective, and industrial scalable process for their synthesis. Anodic arc-discharge in water was employed by our group and diverse nanoparticles were synthesized by simply replacing the anode material [9][10][11][12][13].…”