Sattar, Muhammad AtifBenkraouda, MaamarAmrane, Noureddine
8页查看更多>>摘要：SnSe has a tunable bandgap, high absorption coefficient (10(5)/cm), eco-friendly, earth-abundant material, rendering itself a solid prospect for numerous applications. Doping can influence the electronic and optical properties of the alpha-SnSe. Herein, we present the effect of Ru doping on the electronic, vibrational, and optical properties of the RuxSn(1_x)Se alloy by employing the first-principles framework. The RuxSn(1_x)Se at x = 0.0625 has an indirect bandgap of 0.87 eV. The introduction of more Ru content in the RuxSn(1_x)Se at x = 0.125 results in the metallic characteristics of the alpha-SnSe. A high absorption coefficient is found for the Ru-doped alpha-SnSe. The phonon dispersions calculations of the RuxSn(1_x)Se at x = 0.0625 demonstrate good dynamical stability. Also, we have used the Bethe-Salpeter equation after running the non-self-consistent G(0)W(0 )calculations which indicate that RuxSn(1_x)Se at x = 0.0625 is an excellent absorber of light in the visible region and can be used for applications in solar energy conversion and optoelectronics.
原文链接:
NSTL
Elsevier
Sahu, TanayBhattacharyya, AbirGandi, Appala Naidu
5页查看更多>>摘要：The influence of pressure on the Raman spectra of (B11C)CBCp crystal is studied using first-principles calculations. The calculated spectra agree well with the reported experimental spectra. Reported spectra of recovered samples after depressurization amorphization show activity near similar to 1340 cm(-1), similar to 1520 cm(-1), and similar to 1810 cm(-1). Corresponding phonon modes are identified in the spectra calculated at 100 GPa. These activities are consistently present even at lower pressures up to 0 GPa and is shown to be essential due to the monoclinic symmetry of the polar structure. However, the Raman activity corresponding to the similar to 1810 cm(-1) phonon was not reported up to 50 GPa during pressurization due to its low intensity. The changes in the Raman activity with the pressure are related to the changes in the polarization. The amorphization induced high pressure in the surrounding crystalline region is responsible for the experimentally observed activities in recovered samples after depressurization amorphization.
原文链接:- NSTL
- Elsevier
Irkhin, V. Yu.Skryabin, Yu. N.
4页查看更多>>摘要：An exotic fractionalized Fermi-liquid FL* theory of metallic systems, which combines resonant-valence-bond (RVB) state and the band of current carriers, is treated. An application of this theory to spin-liquid, antiferromagnetic and nearly antiferromagnetic systems is proposed with the use of various bosonic and fermionic representations, a comparison with perturbation theory in the s - d(f) exchange model being performed. The topological aspects including formation of the small Fermi surface are treated. In the case of narrow bands (strong correlations), the ground state is considered as a direct product of RVB and dopon or Weng's fermion states. Examples of Kondo lattices, doped pyrochlores, and metallic beta-Mn, YMn2, Y1-xScxMn2 systems are discussed, analogies with copper-oxide systems being treated.
原文链接:- NSTL
- Elsevier
Tezel, F. MeydaneriTamer, S.Kariper, I. A.
7页查看更多>>摘要：In this study, MoO/MWCNT thin-film supercapacitors were produced at different temperatures (20 degrees C, 40 degrees C, 60 degrees C and 80 degrees C) on Polymethylmethacrylate (PMMA) substrates via Chemical Bath Deposition (CBD). The surface morphologies of the produced MoO/MWCNT/PMMA thin film supercapacitors were analysed by FESEM, and their chemical compositions were determined by EDX analysis. MoO/MWCNT thin films were analysed by XRD, and vibration band stretch was examined using FTIR analysis. Electrochemical properties were determined from time-dependent current-voltage (I-V) measurements in the range of -0.2 V - 0.3 V, at 5 mV/s, 10 mV/s and 20 mV/s scanning rates using Keithley 2400 sourcemeter. Accordingly, the maximum specific capacitance was calculated as 522 F/g for MoO/MWCNT/PMMA, at 60 degrees C, and 5 mV/s scanning rate. The superior performances can be attributed to excellent electrical conductivity and fast ion transport. This work introduces a simple production method for low-cost, scalable, and high-performance CNT-based supercapacitors.
原文链接:- NSTL
- Elsevier
Wang, BingLiu, YingduDeng, ZhiliangLi, Pei...
6页查看更多>>摘要：Despite the excellent properties of perovskite materials, the strict oxygen-free atmosphere, heating temperature and a large number of toxic solvents applied during preparation obstruct their more widespread applications. Using ethanol as a green anti-solvent to successfully prepare a series of copper-based perovskite micro-phosphors. They have a luminescence peak between 445 nm and 580 nm adjusted with halogen and the high -est PLQY of 81.6%. Moreover, by simply adjusting the molar ratio of CsI to CuI, white-light emission phosphors can be synthesized in one step. It exhibits a Commission Internationale de L'Eclairage (CIE) chromaticity co-ordinates (0.35, 0.35) and a correlated color temperature (CCT) of 4798 K. After two months of storage, there is still 97.4% of the initial light intensity. This technology offers a green and straightforward method for producing perovskite phosphors.
原文链接:- NSTL
- Elsevier
