scholarly journals Very high commutation quality factor and dielectric tunability in nanocomposite SrTiO3 thin films with Tc enhanced to >300 °C

Nanoscale ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 3460-3468 ◽  
Author(s):  
Abhijeet L. Sangle ◽  
Oon Jew Lee ◽  
Ahmed Kursumovic ◽  
Wenrui Zhang ◽  
Aiping Chen ◽  
...  
Keyword(s):  
Thin Films ◽  
Quality Factor ◽  
Room Temperature ◽  
Dielectric Tunability ◽  
Nanocomposite Thin Films ◽  
Very High

We report on nanoengineered SrTiO3–Sm2O3 nanocomposite thin films with the highest reported values of commutation quality factor (CQF or K-factor) of >2800 in SrTiO3 at room temperature.

scholarly journals Measurement of Electrical Properties of Superconducting YBCO Thin Films in the VHF Range

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3360
Author(s):  
Yakir Dahan ◽  
Eldad Holdengreber ◽  
Elichai Glassner ◽  
Oz Sorkin ◽  
Shmuel E. Schacham ◽  
...  
Keyword(s):  
Thin Films ◽  
Theoretical Model ◽  
Quality Factor ◽  
High Frequency ◽  
Unit Length ◽  
Superconducting Thin Films ◽  
Electrical Parameters ◽  
Very High Frequency ◽  
Production Constraints ◽  
Very High

A new measurement technique of electrical parameters of superconducting thin films at the Very High Frequency (VHF) range is described, based on resonators with microstrip (MS) structures. The design of an optimal resonator was achieved, based on a thorough theoretical analysis, which is required for derivation of the exact configuration of the MS. A theoretical model is presented, from which an expression for the attenuation of a MS line can be derived. Accordingly, simulations were performed, and an optimal resonator for the VHF range was designed and implemented. Production constraints of YBa2Cu3O7 (YBCO) limited the diameter of the sapphire substrate to 3″. Therefore, a meander configuration was formed to fit the long λ/4 MS line on the wafer. By measuring the complex input reflection coefficients of a λ/4 resonator, we extracted the quality factor, which is mainly affected by the dielectric and conductor attenuations. The experimental results are well fitted by the theoretical model. The dielectric attenuation was calculated using the quasi-static analysis of the MS line. An identical copper resonator was produced and measured to compare the properties of the YBCO resonator in reference to the copper one. A quality factor of ~6·105 was calculated for the YBCO resonator, three orders of magnitude larger than that of the copper resonator. The attenuation per unit length of the YBCO layer was smaller by more than five orders of magnitude than that of the copper.

scholarly journals A tunable volatile organic compound sensor by using PtOx/GQDs/TiO2 nanocomposite thin films at room temperature under visible-light activation

RSC Advances ◽  
2017 ◽  
Vol 7 (63) ◽  
pp. 39859-39868 ◽  
Author(s):  
Shaofeng Shao ◽  
Yunyun Chen ◽  
Shenbei Huang ◽  
Fan Jiang ◽  
Yunfei Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Visible Light ◽  
Gas Sensors ◽  
Room Temperature ◽  
Light Activation ◽  
Nanocomposite Thin Film ◽  
Nanocomposite Thin Films ◽  
Volatile Organic ◽  
Visible Light Activation

Pt/GQDs/TiO2 nanocomposite thin film-based gas sensors show tunable VOC sensing behaviour at room temperature under visible-light activation.

Deposition of Thin Films of Silicon Carbide on Fused Quartz and on Sapphire by Laser Ablation of Ceramic Silicon Carbide Targets

1992 ◽  
Vol 285 ◽  
Author(s):  
L. Rimai ◽  
R. Ager ◽  
J. Hangas ◽  
E. M. Loaothetis ◽  
Nayef Abu-ageel ◽  
...  
Keyword(s):  
Thin Films ◽  
Silicon Carbide ◽  
Room Temperature ◽  
Optical Band Gap ◽  
Energy Gap ◽  
Fused Silica ◽  
High Resistivity ◽  
Fused Quartz ◽  
Amorphous Sic ◽  
Very High

ABSTRACTAblation of ceramic silicon carbide with 351 nm excimer radiation was used to depositSIC films on fused silica and on sapphire. For deposition temperatures above 850° C, diffraction shows the films to be crystalline with the [111] axis preferentially oriented normally to the film. Optical spectra show an indirect energy gap at 2.2 eV, near that for the cubic polytype, although the 200 diffractions are absent. Room temperature resistivities range between .02 to .1 Ωcm. Deposition below 600° C yields amorphous SiC with no diffraction bands, low and variable optical band gap and very high resistivity.

scholarly journals Room temperature magnetoresistance properties in self-assembled epitaxial La0.7Sr0.3MnO3:NiO nanocomposite thin films

2018 ◽  
Vol 6 (9) ◽  
pp. 489-494 ◽  
Author(s):  
Y. J. Wu ◽  
Z. J. Wang ◽  
X. K. Ning ◽  
Q. Wang ◽  
W. Liu ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Nanocomposite Thin Films ◽  
Self Assembled

VERY HIGH TUNABILITY OF BaSnxTi1-xO3 FERROELECTRIC THIN FILMS DEPOSITED BY SOL-GEL

2011 ◽  
Vol 04 (01) ◽  
pp. 49-52 ◽  
Author(s):  
MANUEL MASCOT ◽  
DIDIER FASQUELLE ◽  
JEAN-CLAUDE CARRU
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Spin Coating ◽  
Room Temperature ◽  
Sol Gel ◽  
Si Substrates ◽  
High Tunability ◽  
Annealing Conditions ◽  
Record Value ◽  
Very High

Ba(Sn0.02Ti0.98)O3 thin films (BTS) were prepared by sol-gel route and deposited by spin-coating on commercial Pt/Ti/SiO2/Si substrates. By modifying the annealing conditions from 750°C for 1 h to 950°C for 15 min, the grain size increased from 60 nm to 110 nm due to the increased driving force. The dielectric permittivity ε′ and tunability nr are correlated with the grain size: these parameters increase with the grain size. At room temperature for the BST film annealed at 950°C, a record value of 76% of tunability is obtained at 10 kHz. This very high value of tunability makes BaSnTiO 3 a very good candidate for tunable devices.

Single-electron tunneling at room temperature in TixSi1−xO2 nanocomposite thin films

2005 ◽  
Vol 87 (25) ◽  
pp. 253108 ◽  
Author(s):  
D. K. Sarkar ◽  
D. Brassard ◽  
M. A. El Khakani ◽  
L. Ouellet
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Electron Tunneling ◽  
Single Electron ◽  
Single Electron Tunneling ◽  
Nanocomposite Thin Films

Experimental investigations on NO2 sensing of pure ZnO and PANI–ZnO composite thin films

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 56149-56158 ◽  
Author(s):  
Rakesh K. Sonker ◽  
B. C. Yadav ◽  
A. Sharma ◽  
M. Tomar ◽  
V. Gupta
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Gas Sensing ◽  
Experimental Investigations ◽  
Hybrid Nanocomposite ◽  
Composite Thin Films ◽  
Sensing Properties ◽  
Nanocomposite Thin Films ◽  
Gas Sensing Properties

In the present work, comparative investigations on NO2 gas sensing properties of the hybrid nanocomposite thin films of polyaniline (PANI), ZnO and PANI–ZnO towards NO2 gas at room temperature have been reported.

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