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Influence of 2-Amino-4-methylpyridine and 2-Aminopyrimidine Ligands on the Malonic Acid-Cu(II) System: Insights through Supramolecular Interactions and Photoresponse Properties
摘要： Two Cu(II)-malonate complexes with 2-amino-4-methylpyridine (complex 1) and 2-aminopyrimidine (complex 2) auxiliary ligands were synthesized, and their single-crystal X-ray diffraction structures were established. Change in the auxiliary ligand exhibits substantial structural variation in the present complexes. Complex 1 shows a one-dimensional anionic copper-malonate moiety connected by the malonate bridge, whereas complex 2 is a mononuclear one. For both the complexes, auxiliary ligands are attached with the Cu-malonate moiety through various noncovalent interactions. Optical band gap, electrical conductivity, and photosensitivity of complexes 1 and 2 were measured, but the values of electrical parameters of the complexes significantly differ from each other. However, the magnitudes of electrical parameters increase several times for both the complexes when they are exposed under visible light, though the values of light sensing parameters of complex 1 were found to be higher than those of complex 2. Density functional theory calculations for complex 1 were carried out to support the experimental result.
关键词： 2-aminopyrimidine,electrical conductivity,Cu(II)-malonate complexes,density functional theory,2-amino-4-methylpyridine,optical band gap,noncovalent interactions,photosensitivity
更新于2025-09-16 10:30:52
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Self-assembled monolayers of polyoxovanadates with phthalocyaninato lanthanide moieties on gold surfaces
摘要： The two first representatives of phthalocyaninato (Pc) lanthanide-ligated polyoxovanadate cages {[V12O32(Cl)](LnPc)n}n(cid:2)5 (n = 1 or 2, Ln = Yb3+) were synthesised and fully characterised. These magnetic complexes form two-dimensional self-assembled monolayers exhibiting electrical conductivity on gold substrate surfaces, as assessed by using an EGaIn tip.
关键词： gold surfaces,electrical conductivity,phthalocyaninato lanthanide,polyoxovanadates,self-assembled monolayers
更新于2025-09-16 10:30:52
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[IEEE 2019 49th European Microwave Conference (EuMC) - Paris, France (2019.10.1-2019.10.3)] 2019 49th European Microwave Conference (EuMC) - Optimizing the Conductivity of Ink-Jet Printed Microwave Components on Polymer Substrates by Laser Sintering
摘要： In this work, microwave components were printed on a Kapton (polyimide) substrate using a Drop-On-Demand (DOD) ink jet printer with silver nanoparticle ink. Two different laser curing strategies are presented by implementing selective sintering. The measured improvement of the achieved conductivity is between 70 and 100% for such resonators from 5 to 15 GHz.
关键词： Kapton (PI),Electrical conductivity,Polymer substrates,laser sintering,Microwave components,Inkjet printing
更新于2025-09-16 10:30:52
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Solution-processible Cd-doped ZnO nanoparticles as an electron transport layer to achieve high performance polymer solar cells through improve conductivity and light transmittance
摘要： In this work, electron transport layers (ETLs) with high charge transfer ability were prepared by doping ZnO nanoparticles with different concentrations of cadmium(Cd). The inverted polymer solar cell based on PTB7-Th: PC71BM as active layer and various concentrations Cd-doped ZnO (CZO) as ETLs were fabricated. The PCE of the device with optimized Cd content in the ZnO film was about 14.7% larger than that of the pure ZnO-based cells. The cadmium-doped ZnO(CZO) is a good candidate to be used as a high-quality transparent electrode in solar cell applications.
关键词： high electrical conductivity,cadmium doping,electron transport layers,ZnO nanoparticles,inverted polymer solar cells
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Design of Dynamically Tunable Broadband Polarization Converter in Terahertz Frequency Based on Graphene Strips
摘要： The phenomenon of soil salinization in semi-arid regions is getting amplified and accentuated by both anthropogenic practices and climate change. Land salinization mapping and monitoring using conventional strategies are insufficient and difficult. Our work aims to study the potential of synthetic aperture radar (SAR) for mapping and monitoring of the spatio-temporal dynamics of soil salinity using interferometry. Our contribution in this paper consists of a statistical relationship that we establish between field salinity measurement and InSAR coherence based on an empirical analysis. For experimental validation, two sites were selected: 1) the region of Mahdia (central Tunisia) and 2) the plain of Tadla (central Morocco). Both sites underwent three ground campaigns simultaneously with three Radarsat-2 SAR image acquisitions. The results show that it is possible to estimate the temporal change in soil electrical conductivity (EC) from SAR images through the InSAR technique. It has been shown that the radar signal is more sensitive to soil salinity in HH polarization using a small incidence angle. However, for the HV polarization, a large angle of incidence is more suitable. This is, under considering the minimal influence of roughness and moisture surfaces, for a given InSAR coherence.
关键词： interferometric synthetic aperture radar (InSAR) coherence,polarimetric synthetic aperture radar (SAR),soil salinity,Electrical conductivity (EC)
更新于2025-09-16 10:30:52
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The Growth of Ga2O3 Nanowires on Silicon for Ultraviolet Photodetector
摘要： We investigated the effect of silver catalysts to enhance the growth of Ga2O3 nanowires. The growth of Ga2O3 nanowires on a P+-Si (100) substrate was demonstrated by using a thermal oxidation technique at high temperatures (~1000 °C) in the presence of a thin silver film that serves as a catalyst layer. We present the results of morphological, compositional, and electrical characterization of the Ga2O3 nanowires, including the measurements on photoconductance and transient time. Our results show that highly oriented, dense and long Ga2O3 nanowires can be grown directly on the surface of silicon. The Ga2O3 nanowires, with their inherent n-type characteristics formed a pn heterojunction when grown on silicon. The heterojunction showed rectifying characteristics and excellent UV photoresponse.
关键词： electrical conductivity,nanowires,β-Ga2O3,oxidation,silver catalyst,photodetector
更新于2025-09-12 10:27:22
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Intermingled Network of Syndiotactic Polystyrene/Poly(3-hexylthiophene)
摘要： By taking advantage of the fiber forming properties of both polymers in p-xylene, syndiotactic polystyrene (sPS) and poly(3-hexylthiophene) (P3HT) are mixed at an elevated temperature to prepare a composite network. These sPS?P3HT networks have been intensively investigated by UV?vis absorption, FTIR, and DSC; their morphologies by FE-SEM and FEG-TEM; and the molecular structure of the P3HT chains by neutron scattering experiments, rheology, and conductivity. Absorption measurements indicate the occurrence of π?π interaction between the P3HT chains and the sPS phenyl groups. Investigations by FESEM, TEM, and AFM show the formation of an intermingled network of sPS fibrils and P3HT ribbons. Small-angle neutron scattering studies reveal that a fraction of P3HT molecules is possibly encapsulated within the sPS fibrils. The increase of the elastic modulus with increasing P3HT content together with the increase of electrical conductivity is likely related to these encapsulated chains.
关键词： poly(3-hexylthiophene),composite network,syndiotactic polystyrene,π?π interaction,electrical conductivity
更新于2025-09-12 10:27:22
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Magnetron sputtered Sb2Se3-based thin films towards high performance quasi-homojunction thin film solar cells
摘要： Sb2Se3 is a promising candidate for environment-friendly and cost-e?ciently thin ?lm photovoltaics thanks to its material advantages and superior optoelectronic properties. However, it has intrinsically low electrical conductivity, which leads to unsatisfactory device performance and limited scope of applications. Herein, we demonstrated an e?ective strategy of electrical conductivity-induced Sb2Se3-based photovoltaic performance improvement. Three Sb2Se3-based targets with chemical composition of Sb2Se3, Sb2Se3.3 and Sb2(Se0.9I0.1)3 have been ?rstly prepared by using high-temperature melting technique. Then the high-quality thin ?lms can be obtained through an e?ective Radio Frequency (RF) magnetron sputtering process. A novel Sb2Se3 quasi-homojunction thin ?lm solar cell was fabricated for the ?rst time and the highest power conversion e?ciency reaches already a highly interesting 2.65%. The combined features of unique quasi-homojunction device structure and advantageous full-vacuum preparation process further demonstrated its attractive potential for thin ?lm photovoltaic applications.
关键词： Sb2Se3,Quasi-homojunction,Magnetron sputtering,Thin ?lm solar cells,Electrical conductivity
更新于2025-09-12 10:27:22
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revealed by resonant photoelectron spectroscopy
摘要： Resonant photoelectron spectroscopy at the Co and Mn 2p core absorption edges of half-metallic Co2MnGe has been performed to determine the element-speci?c density of states (DOS). A signi?cant contribution of the Mn 3d partial DOS near the Fermi level (EF) was clari?ed by measurement at the Mn 2p absorption edge. Further analysis by ?rst-principles calculation revealed that it has t2g symmetry, which must be responsible for the electrical conductivity along the line perpendicular to the ?lm plane. The dominant normal Auger contribution observed at the Co 2p absorption edge indicates delocalization of photoexcited Co 3d electrons. The difference in the degrees of localization of the Mn 3d and Co 3d electrons in Co2MnGe is explained by the ?rst-principles calculation. Our ?ndings of the element-/orbital-speci?c electronic states near EF will pave the way for future interface design of magnetic tunneling junctions to overcome the temperature-induced reduction of the magnetoresistance.
关键词： first-principles calculation,magnetic tunneling junctions,normal Auger contribution,half-metallic Co2MnGe,magnetoresistance,Resonant photoelectron spectroscopy,Mn 3d partial DOS,element-speci?c density of states,electrical conductivity
更新于2025-09-11 14:15:04
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Synthesis, Characterization and Electrical Conductivity of Nano-Crystalline Erbium Sesquioxide by the Precipitation Method and Subsequent Calcination
摘要： Due to its superior properties, erbium sesquioxide, Er2O3, is considered as an important material for applications in various fields such as corrosion-resistant coating, electrical insulating coating, in sensing membranes, semiconductor devices, as catalyst, and for applications in nuclear engineering. In the open literature there is a lack of information about the preparation of Er2O3 nanoparticles using the homogenous precipitation and subsequent calcination route. In this paper a facile method for the synthesis of Er2O3 nanoparticles is suggested. The fabrication was carried out by using the homogeneous precipitation of an erbium ions using sodium hydroxide followed by the calcination process. The influence of: (i) the pH value (9-12) during precipitation process, and (ii) the calcination temperature 300-700 °C on the structural and textural properties of the solids obtained will be addressed. The thermal events accompanying the heat treatment of the dried parent was monitored using thermogravimetric analysis (TGA). Various physicochemical techniques were used for investigating the structure and morphology of Er2O3 nanoparticles. These include X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectra, filed emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Moreover, the electrical conductivity of the calcined samples with temperature was measured.
关键词： precipitation method,nanocrystalline erbium oxide,Er2O3,electrical conductivity,erbium sesquioxide,Er2O3 nanoparticles
更新于2025-09-11 14:15:04