Gupta, SurbhiDeshpande, S. K.Sathe, V. G.Siruguri, V....
7页查看更多>>摘要：This study investigates the magnetic and electric properties of the 0.5BaFe(10)Sc(2)O(19)-0.5KNbO(3) (0.5BFSc2O-0.5KNO) and 0.5BaFe(10)In(2)O(19)-0.5KNbO(3) (0.5BFIn2O-0.5KNO) composite samples. Refined X-ray diffraction (XRD) studies substantiate the presence of both ferrimagnetic (BFSc2O and BFIn2O) and ferroelectric KNbO3 phase with the ratio (0.5:0.5) in both the compounds without any impure phase. By electric poling the samples with an electric field of 2.5 kV/cm, magnetization shows a different behaviour (decreasing in Sc and increasing in doped composite), can be attributed to the electric field induced changes of spin states due to stress induced at the interface of ferrimagnetic (FM)/ferroelectric (FE) regions. Strong converse magnetoelectric coupling (CME) was observed in both the compounds, with a large electric field modulation in magnetism (80%) in the 0.5BFInO-0.5KNO composite. Dielectric studies reveal the presence of ferroelectric (FE-T-c) transition around the magnetic Curie temperature (FM-T-c) of respective composites, further indicates the presence of converse magnetoelectric coupling in both systems.
原文链接:
NSTL
Elsevier
Rani, AgamAhlawat, NeetuKundu, R. S.Rani, Kanika...
11页查看更多>>摘要：This work reported about impact of co-doping on structural and non-linear electrical property of CaCu3Ti4O12 (CCTO) ceramics with composition Ca0.95Sr0.05Cu3Ti3.94Nb0.06O12 prepared by solid state reaction technique. Rietveld refinement of X-ray diffraction data was performed to analyse various parameters for its structure exploration. Microstructure and compositional information of prepared ceramic was determined by SEM, EDX and elemental mapping. The grain size was found 2.32 mu m with the use of ImageJ software on SEM images. The identical Raman mode were observed in present doped CCTO ceramics comparative to that reported for pure CCTO in Raman spectroscopy. The resistivity of prepared sample reveals NTC behaviour of the ceramic. The parameters; non-linear coefficient (alpha = 1.86), breakdown electric field (Eb = 191.56V/cm) and leakage current (I = 0.44 mA) were obtained by current voltage measurement at room temperature (RT~303K). The detail comparative study of various barrier models was carried out and found Schottky barriers as most suited model for potential barrier at grain boundaries in the present system.
原文链接:- NSTL
- Elsevier
Ozturk, M.Coskun, R.Okutan, M.Yalcin, O....
8页查看更多>>摘要：Structural, optical and dielectric properties determining the conduction mechanism were investigated using appropriate measurement techniques to determine the suitability of low-concentrations (LC) (1000 mu L, 500 mu L, 250 mu L and 125 mu L) reactive red 45 (RR-45) dye loaded hydrogels for electrical circuit applications. The UV spectra of the all samples displayed a fluctuating behaviour depending on the concentration. It was found that the dielectric plane plots for all the samples are compatible with the Cole-Cole relaxation model and correspond to an equivalent electrical circuit (RC) representing with the impedance circuit in the Smith Chart. It was concluded that RR-45 dye loaded hydrogels could be a suitable material for electrodes used in electroenceph-alography and electrocardiography systems due to the decrease of the real part of complex dielectric constant and impedance values with increasing frequency. The s-parameter for the samples, which determines the con-ductivity mechanism, was calculated separately for different regions.
原文链接:- NSTL
- Elsevier
Patel, AnandPatel, KunjalLimberkar, ChaitanyaJethwa, Vibhutiba...
7页查看更多>>摘要：Two-dimensional (2D) transition metal trichalcogenides (TMTCs) have been considered promising candidates for next-generation electronic devices. TMTCs containing quasi-one-dimensional chain structure, in contrast to twodimensional (2D) Transition Metal Dichalcogenides (TMDCs), provide significant advantages in electronics and optoelectronics device modeling and engineering to enhance device performance. In this study, we present a pulse photoresponse application of a device based on the DVT-grown ZrS3 crystal at different cryogenic temperatures. It also includes anisotropy produced due to the layered growth of the TMC materials. Two types of contact arrangements were made to verify the anisotropic behaviour. The device was illuminated under light sources having different wavelengths (Blue-470 nm, Green-540 nm and Red-670 nm). It shows good stability under ambient conditions towards the variable wavelength source in both types of contact arrangements. The results indicate that ZrS3 is a potential candidate for optoelectronic devices even in uncommon conditions.
原文链接:- NSTL
- Elsevier
Hameed, S. T.Qahtan, Talal F.Abdelghany, A. M.Oraby, A. H....
11页查看更多>>摘要：Zinc oxide nanoparticles (ZnO NPs) with sizes 20-80 nm were successfully prepared using the Sol-Gel technique. They were loaded with different weight ratios (wt.%) ~ 0, 0.3, 0.8, 2, 4, and 6 wt% on a polymer blend of carboxymethyl cellulose (CMC)/polyethylene oxide (PEO) (70:30) utilizing the solution casting route. The formed ZnO NPs loaded with CMC/PEO blend demonstrate a notable decrement in the bandgap from 4.51 to 3.34 eV. A significant increase in the refractive index from 1.79 to 1.97 was observed with increasing ZnO NPs content from 0 to 6 wt %. AC conductivity (tr sigma(ac)) measurements at 298 K revealed a measurable enhancement in conductivity and dielectric parameters with the increase of ZnO NPs contents reaching their optimum values at 2 wt%. Furthermore, the temperature dependence of the sigma(ac) and dielectric parameters was investigated for the optimum concentration, highlighting its unique characteristics for solid-state supercapacitors.
原文链接:- NSTL
- Elsevier
Baowan, DuangkamonThamwattana, NgamtaTran-Duc, Thien
9页查看更多>>摘要：The development of artificial transmembrane channels that are capable of transporting ions, water and small molecules across cell membrane is crucial for applications in drug delivery and gene therapy. In this paper, we determine the interaction between ions and artificial channels in order to understand the mechanisms underlying the selection and transport of ions through the channels. Particularly, the concept of suction energy is employed to determine the interaction of ions (Na+, Cl-, Ca2+, K+) and cylindrical and hourglass shaped channels made from polyethylene terephthalate (PET). Based on this concept, we find critical pore sizes for cylindrical and hourglass shaped channels that can be used for selective separation of positive charged ions. Further, we find that coating PET channel with different materials can reduce these values of the critical pore sizes. These results are also confirmed by molecular dynamics studies. The main contribution of this work is mathematical expressions for the interaction energy as a function of ion type, channel structure and size of the channel, and this method can be applied to study other pores with different shapes and sizes.
原文链接:- NSTL
- Elsevier
Vetrivelan, V.Ramalingam, G.Manikandan, A.Viswanathan, S....
11页查看更多>>摘要：Herein, we synthesized a novel two-dimensional nanostructure of pure TiO2 and heterostructure of citric acid and L-cysteine capped on MoS2@TiO2 by hydrothermal method. Prepared nanomaterials are characterised by the latest analytical methods and the obtained results are compared with the Density Functional Theory based theoretical simulation results. The experimental and theoretical studies of pure TiO2, MoS2@TiO2 showed that the heterostructure has latent applications in many fields, such as dye-sensitized solar cell (DSSC) and optoelectronic devices, energy storage and conversion, etc. The optimized structure and lowest excited states of pure TiO2 and MoS2@TiO2 heterostructure should have been obtained by DFT. Especially the newly adopted experimental data of spectral analysis are well aligned with theoretical values. Through our investigation, it is evidenced that L-cysteine capped MoS2@TiO2 heterostructure has better solar cell performance compared to single-phase TiO2. The long lasting DSSC performances were significantly from 2.6 to 3.3%.
原文链接:- NSTL
- Elsevier
Mehboob, Muhammad YasirKhan, Muhammad UsmanHussain, RiazKhalid, Muhammad...
12页查看更多>>摘要：Making contribution to the development of novel photovoltaic materials for solar cell applications, we rationally developed six novel vinylbenzene based planar donor-pi-acceptor (D-pi-A) compounds. Optoelectronic properties of developed molecules are determined using frontier molecular orbital (FMO), UV-Visible, density of state (DOS), transition density matrix (TDM) heat map, open circuit voltage (Voc), binding energies (Eb), reorganization energy of electron (lambda e), hole (lambda h), charge transfer analysis and compared with reference DVB-T-ID. Donor group modifications effectively contributed to augment photovoltaic features in all developed compounds. Developed molecules are found with reduced energy gap (2.566-1.805 eV), broaden absorption wavelength (548.09-800.36 nm) and small transition energy (2.262-1.549 eV) as compared to reference DVB-T-ID values 2.819 eV, 492.84 nm and 2.515 eV respectively. The developed molecules have proficient hole and electron transfer mobilities and can serve as best candidate when blended with PC61BM film. Optoelectronic features of all developed molecules especially D5 is ascertained eye-catching as compared to DVB-T-ID, hence recommended for future solar cell applications.
原文链接:- NSTL
- Elsevier
