Effect of direct–current biasing on the adjustable radio-frequency negative permittivity characteristics of Bi2SiO5/multiwall carbon nanotube metacomposites

Construction of Ultrafine Ag2S NPs Anchored onto 3D Network Rodlike Bi2SiO5 and Insight into the Photocatalytic Mechanism

“…Especially, the O 1s spectrum was fitted into four peaks corresponding to O ads , −OH, Bi−O, and Si−O, respectively. 19,29 And the position of fitting peaks from the O 1s, Ag 3d, Bi 4f, S 2p, and Si 2p spectra of the ABSO 0.10 lightly shifted (<0.5 eV) compared with those of the respective Ag 2 S and Bi 2 SiO 5 , confirming the interaction between Ag 2 S and Bi 2 SiO 5 . 30−32 The morphologic structure of the pristine Ag 2 S, virgin Bi 2 SiO 5 , and ABSO composites was investigated by SEM and TEM, and the results are shown in Figures 2 and 3.…”

“…14 And the fitting of the O 1s spectrum showed four peaks at 532.5, 531.4, 530.3, and 529.0 eV, which were attributed to the surface-adsorbed oxygen (O ads ), defect oxygen (O v ), Bi−O, and Si−O, respectively. 18,29 After the incorporation of Ag 2 S into Bi 2 SiO 5 , the O 1s, Ag 3d, Bi 4f, S 2p, and Si 2p spectra of the ABSO 0.10 composite were similar to the corresponding spectra of the pristine Ag 2 S and virgin Bi 2 SiO 5 , except for some minor variations in the binding energies. Especially, the O 1s spectrum was fitted into four peaks corresponding to O ads , −OH, Bi−O, and Si−O, respectively.…”

“…Talking about the virgin Bi 2 SiO 5 , the high-resolution Bi 4f spectrum had two peaks at 164.5 eV (Bi 4f 5/2 ) and 159.2 eV (Bi 4f 7/2 ) with an energy gap of 5.3 eV assigned to Bi 3+ , while the Si 2p spectrum exhibited a strong peak at 101.7 eV, which was characteristic of Si 4+ . And the fitting of the O 1s spectrum showed four peaks at 532.5, 531.4, 530.3, and 529.0 eV, which were attributed to the surface-adsorbed oxygen (O ads ), defect oxygen (O v ), Bi–O, and Si–O, respectively. , After the incorporation of Ag 2 S into Bi 2 SiO 5 , the O 1s, Ag 3d, Bi 4f, S 2p, and Si 2p spectra of the ABSO 0.10 composite were similar to the corresponding spectra of the pristine Ag 2 S and virgin Bi 2 SiO 5 , except for some minor variations in the binding energies. Especially, the O 1s spectrum was fitted into four peaks corresponding to O ads , −OH, Bi–O, and Si–O, respectively. , And the position of fitting peaks from the O 1s, Ag 3d, Bi 4f, S 2p, and Si 2p spectra of the ABSO 0.10 lightly shifted (<0.5 eV) compared with those of the respective Ag 2 S and Bi 2 SiO 5 , confirming the interaction between Ag 2 S and Bi 2 SiO 5 . − …”

High temperature study of dielectric and electrical conduction behaviour of La2NiO4

“…In the literature two theoretical models Drude and Drude-Lorentz have been applied to fit the experimentally data of the negative permittivity. Drude model has been mainly used by the researchers to explain the negative permittivity behavior of metals and semiconductors [10,38]. According to this model, the real part of complex permittivity (ε r ′) is given by the equation ( 8 The Drude model was fitted to the experimental data points, as shown in figure 7(a).…”

“…It has been reported long back that below plasma frequency, the permittivity of metals has a negative sign the plasma frequency of bulk metals lies in the visible or ultraviolet band [9]. A model to describe the negative permittivity behavior of metals was put forth by Drude in 1900 [10][11][12]. This model explained the correlation of charge carrier concentration with plasma frequency.…”