Hydrated Transition Metal Oxide Films for Reversible Switching in Near IR Region

1997 ◽  
Vol 479 ◽  
Author(s):  
I. Shiyanovskaya ◽  
M. Hepel
Keyword(s):  
Transition Metal ◽  
Transition Metal Oxides ◽  
Near Infrared ◽  
Oxide Films ◽  
Infrared Region ◽  
Light Modulation ◽  
Fast Switching ◽  
Near Ir ◽  
Double Charge

AbstractElectro-optical properties of thin films of hydrated transition metal oxides, WO3 2(H2O) and WO3 1/3(H2O), have been investigated in situ using photoelectrochemical methods. These films can reversibly change their light absorption in the near IR region due to the double charge injection upon the applied electric field in electrolyte media. Taking into account the high stability and fast switching time, these hydrated tungsten oxide films can be utilized for efficient light modulation in the near infrared region of the spectrum.

Activation of transition metal oxides by in-situ electro-regulated structure-reconstruction for ultra-efficient oxygen evolution

Nano Energy ◽  
2019 ◽  
Vol 58 ◽  
pp. 778-785 ◽  
Author(s):  
Huawei Huang ◽  
Chang Yu ◽  
Hongling Huang ◽  
Changtai Zhao ◽  
Bo Qiu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Oxygen Evolution ◽  
Transition Metal Oxides ◽  
Structure Reconstruction

On the use of diamond as a pressure calibrant for near-infrared FT–Raman microspectroscopy at high pressures

1995 ◽  
Vol 73 (7) ◽  
pp. 1019-1022 ◽  
Author(s):  
Ross D. Markwell ◽  
Ian S. Butler
Keyword(s):  
Near Infrared ◽  
Phonon Mode ◽  
High Pressures ◽  
Ambient Pressure ◽  
Raman Microspectroscopy ◽  
Near Ir ◽  
Ft Raman Spectroscopy ◽  
Diamond Anvil ◽  
Ft Raman

The pressure-induced shift of the Raman-active t2g phonon mode of the diamond windows in a commercial diamond-anvil cell, located at l332.5 cm−1 at ambient pressure, can be used as an in situ calibrant for near-IR FT–Raman microspectroscopy at high pressures. The measured pressures are considered to be accurate to within ±2 kbar throughout the 4–45 kbar range for which the associated pressure (P, kbar) vs. wavenumber (v, cm−1) relationship is P = 6.66v − 1335.9. Keywords: FT–Raman spectroscopy, diamond, high pressures.

3D Ln–Organic Frameworks Featuring Lantern-Shaped Dihelicate Chains: Synthesis and Magnetic and Photophysical Properties

2016 ◽  
Vol 69 (9) ◽  
pp. 1062 ◽  
Author(s):  
Shengyun Liao ◽  
Peiyao Du ◽  
Yanping Zhang ◽  
Xin Fu ◽  
Wen Gu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Hydrothermal Reaction ◽  
Photophysical Properties ◽  
Metal Organic Framework ◽  
Visible Region ◽  
Infrared Region ◽  
X Ray Diffraction ◽  
Topological Network ◽  
Metal Organic

The in situ hydrothermal reaction of rare earth nitrate (Ln(NO3)3), 5-(4-carboxyl-1H-1,2,3-triazol-1-yl) isophthalic acid (H3ctia), and (NH4)2C2O4 resulted in the formation of a series of 3D 4f coordination polymers ([Ln(tia)(C2O4)0.5(H2O)]) (Ln = Nd (1), Sm (2), Eu (3), Gd (4), Tb (5), Dy (6), and tia2– = 5-(1H-1,2,3-triazol-1-yl) isophthalate). The results of single crystal X-ray diffraction reveal that the dinuclear lantern sub-building units ([Ln2(CO2)4]2+) are linked by C2O42– to form dihelicate chains, which are connected by tia2– to afford a novel 3D metal–organic framework with an unordinary 3-nodal (2,3,8)-connected topological network with the Schläfli symbol of {4.62}2{42.616.89.10}{6}. Complexes 2, 3, 5, and 6 exhibit strong fluorescent emissions in the visible region and complexes 1, 2, and 6 show characteristic fluorescent emissions in the near-infrared region. In addition, the magnetic properties of complexes 4, 5, and 6 were also investigated.

scholarly journals Structure and properties of zirconium oxide films doped with yttrium oxide obtained by laser deposition in vacuum

2020 ◽  
pp. 10-18
Author(s):  
Nikolai A. Bosak ◽  
Aleksandr N. Chumakov ◽  
Aleksandr A. Shevchenok ◽  
Liudmila V. Baran ◽  
Victoria V. Malutina-Bronskaya ◽  
...  
Keyword(s):  
Yttrium Oxide ◽  
Zirconium Oxide ◽  
Near Infrared ◽  
Radiation Power ◽  
Oxide Films ◽  
Surface States ◽  
Infrared Region ◽  
Laser Exposure ◽  
Glass Substrates ◽  
Middle Infrared

The thin films deposited in vacuum (2 ⋅ 10–2 mm Hg) on the silicon and glass substrates under the multi-pulse high-frequency (10 –15 kHz) laser exposure (laser radiation power density 100 MW/cm2 and the distance from the target to the substrate 40 mm) for zirconium oxide ZrO2 ceramics doped with yttrium oxide 5 % Y2O3. The morphology of the obtained films was studied using atomic force microscopy. The features of transmission spectra in the visible, near infrared and middle infrared region were revealed. The transmission of the zirconium oxide film on the silicon substrate reached 12 % in the spectral region from 1.0 to 2.5 μm, and in the region from 2.6 to 6.0 μm was 4.7 %. On a glass substrate, the transmittance at a wavelength of 643 nm was 60 %, and at a wavelength of 2500 nm it reached 87 %. In the middle infrared region, transmission at a frequency of 2548 cm–1 was 70 % and reached 75 % at a frequency of 3566 cm–1. The volt-ampere and capacitance-voltage characteristics of the obtained zirconium oxide films were characterized by non-linearity, including hysteresis, and are probably due to the presence of discrete surface states with a wide energy spectrum associated with nanoparticles and nanocrystalline film inclusions.

scholarly journals The Effects of Transition Metal Oxides (Me = Ti, Zr, Nb, and Ta) on the Mechanical Properties and Interfaces of B4C Ceramics Fabricated via Pressureless Sintering

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1253
Author(s):  
Guanqi Liu ◽  
Shixing Chen ◽  
Yanwei Zhao ◽  
Yudong Fu ◽  
Yujin Wang
Keyword(s):  
Mechanical Properties ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Milling Process ◽  
Second Phase ◽  
Pressureless Sintering ◽  
And Performance ◽  
Better Than

There is little available research on how different transition metal oxides influence the behavior of B4C-based ceramics, especially for Ta2O5 and Nb2O5. B4C-MeB2 (Me = Ti, Zr, Nb, and Ta) multiphase ceramic samples were prepared via in situ pressureless sintering at 2250 °C, involving the mixing of B4C and MeOx powders, namely TiO2, ZrO2, Nb2O5, and Ta2O5. The phase constituents, microstructures, and mechanical properties of the samples were tested. The results indicated that different transition metal elements had different effects on the ceramic matrix, as verified through a comparative analysis. Additionally, the doped WC impurity during the ball milling process led to the production of (Me, W)B2 and W2B5, which brought about changes in morphology and performance. In this study, the Ta2O5-added sample exhibited the best performance, with elastic modulus, flexural strength, Vickers hardness, and fracture toughness values of 312.0 GPa, 16.3 GPa, 313.0 MPa, and 6.08 MPa·m1/2, respectively. The comprehensive mechanical properties were better than the reported values when the mass fraction of the second phase was around five percent.

Highly efficient near IR photosensitizers based-on Ir–C bonded porphyrin-aza-BODIPY conjugates

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72115-72120 ◽  
Author(s):  
Jinfeng Zhou ◽  
Lizhi Gai ◽  
Zhikuan Zhou ◽  
John Mack ◽  
Kejing Xu ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Near Infrared ◽  
Infrared Region ◽  
Quantum Yields ◽  
Highly Efficient ◽  
Near Ir ◽  
Near Infrared Region

Novel orthogonally arranged Ir(iii) porphyrin-aza-BODIPY conjugates exhibit strong absorbance in the near infrared region and have unusually high singlet oxygen quantum yields, since they act as unique molecules rather than as dyads.

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