A5090809420- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Electron Spin Resonance Studies
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Molecular Junctions and Nanostructures
- Porphyrin and Phthalocyanine Chemistry
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Organic and Molecular Conductors Research
- ZnO doping and properties
- X-ray Diffraction in Crystallography
- Advanced Sensor and Energy Harvesting Materials
- Metal complexes synthesis and properties
- Crystallization and Solubility Studies
- Copper-based nanomaterials and applications
- Magnetic properties of thin films
- Metamaterials and Metasurfaces Applications
- Tactile and Sensory Interactions
- Metal-Catalyzed Oxygenation Mechanisms
- Green IT and Sustainability
- Rare-earth and actinide compounds
- Advanced Chemical Physics Studies
- Photonic Crystals and Applications
- Nonlinear Optical Materials Studies
University of Nebraska–Lincoln
2018-2024
Applied Materials (United States)
2023
Sungkyunkwan University
2016-2018
Triboelectric nanogenerators (TENGs) can be incorporated into modern electronic devices requiring sustainable, renewable, and reliable microscale energy sources. We report the first use of human hair, which is known to a highly triboelectric material, for fabrication biobased TENGs. Ethanolic NaOH was used dissolve two simple techniques, bar- spin-coating methods, were prepare hair-based films on electrode substrates. The dissolved hair paste has somewhat different chemical composition from...
Nonvolatile, molecular multiferroic devices have now been demonstrated, but it is worth giving some consideration to the issue of whether such could be a competitive alternative for solid-state nonvolatile memory. For Fe (II) spin crossover complex [Fe{H2B(pz)2}2(bipy)], where pz = tris(pyrazol-1-yl)-borohydride and bipy 2,2′-bipyridine, voltage-controlled isothermal changes in electronic structure state demonstrated are accompanied by conductance. Higher conductance seen with...
Although the large Kerr coefficient of aqueous graphene oxide (GO) dispersions is quite attractive for electro-optical applications with low power consumption, maximum birefringence GO not sufficiently high actual display applications. Here we report that adding a small amount larger particles (about 4 μm) into high-concentration dispersion 0.2 can improve sensitivity to an electric field and also birefringence. Large GOs induce ordering enhance switching. have higher polarizability are...
From X-ray absorption spectroscopy (XAS) and photoemission (XPS), it is evident that the spin state transition behavior of Fe(II) crossover coordination polymer crystallites at surface differs from bulk. A comparison four different polymers reveals observed properties may differ bulk for a variety reasons. There are with either almost complete switching or no all. Oxidation, differences in packing, changes could all contribute to making very Some be sufficiently photoactive so spectroscopies...
Abstract Adding Fe 3 O 4 nanoparticles to composites of [Fe(Htrz) 2 (trz)](BF ) spin-crossover polymer and polyaniline (PANI) drives a phase separation both restores the molecular structure cooperative effects without compromising increased conductivity gained through addition PANI. We observe an on-off ratio for DC owing enlarged off state resistivity 20 times larger AC on compared with values. The nanoparticles, primarily confined phase, are ferromagnetically coupled local moment molecule...
For the spin crossover coordination polymer [Fe(L1)(bipy)]<sub>n</sub> (where L1 is a N<sub>2</sub>O<sub>2</sub><sup>2−</sup> coordinating Schiff base-like ligand bearing phenazine fluorophore and bipy = 4,4′-bipyridine), there compelling additional evidence of state transition.
The effects of doping Mn into ZnS and CdS quantum dots (QDs) are reported. Scanning tunneling spectroscopy spectra show a reduction in the electronic band gap both upon incorporation dopant. Mn:ZnS exhibits rigid shift toward higher bias, which is reminiscent hole-doping effect. This argued, with help X-ray photoelectron spectroscopy, to be due mechanism caused by favorable formation Zn vacancies S compared that undoped films. In CdS, no observed even though presence Cd can confirmed...
Abstract Transition metal doping is an effective tool for controlling optical absorption in ZnS and hence the number of photons absorbed by photovoltaic devices. By using first principle density functional calculations, we compute change upon with a selected transition found that Ni offers best chance to improve performance. This attributed formation defect states band gap host which give rise additional dipole-allowed pathways between conduction valence band. Analysis level shows TM dopants...
A chiral 3D coordination compound, [Gd2(L)2(ox)2(H2O)2], arranged around a dinuclear Gd unit has been characterized by X-ray photoemission and absorption measurements in the context of density functional theory studies. Core level 5p multiplet splittings indicates that spin orbit coupling dominates over j-J evident core spectra metal. Indications spin-orbit are consistent with absence inversion symmetry due to ligand field. Density predicts antiferromagnet alignment Gd2 dimers band gap...
The X-ray-induced spin crossover transition of an Fe (II) molecular thin film in the presence and absence a magnetic field has been investigated. thermal activation energy barrier soft X-ray for [Fe{H2B(pz)2}2(bipy)] films is reduced applied field, as measured through absorption spectroscopy at various temperatures. influence 1.8 T sufficient to cause deviations from expected exponential state behavior which free case. We find that orbital moment diminishes with increasing temperature,...
[Fe-(pyrazine){Pd(CN)
A method for synthesizing photoactive inorganic perovskite quantum dot inks and an inkjet printer deposition method, using the synthesized inks, are demonstrated. The ink synthesis is based on a simple wet chemical reaction printing protocol facile step by method. printed thin films have been characterized X-ray diffraction, optical absorption spectroscopy, photoluminescent electronic transport measurements. diffraction of indicates crystal structure consistent with orthorhombic room...
The addition of various dipolar molecules is shown to affect the temperature dependence spin state occupancy much studied crossover Fe(II) complex, [Fe{H2B(pz)2}2(bipy)] (pz = pyrazol-1-yl, bipy 2,2'-bipyridine). Specifically, benzimidazole results in a re-entrant transition, i.e. starts mostly low state, then high increases, and finally decreases with increasing temperature. This behavior contrasts that observed when highly polar p -benzoquinonemonoimine zwitterion C6H2(…NH2)2(…O)2 was...
Few-layered HfS 3 nanoribbons exhibit n-type conductivity and a large photoresponse to visible light. The photocurrent strongly depends on the polarization direction of excitation laser due highly anisotropic quasi-1D crystal structure .
We examine here the conductance changes associated with change in spin state a variety of different structures, using example crossover complex [Fe(H2B(pz)2)2(bipy)] (pz= (pyrazol-1-yl)-borate and bipy = 2,2’-bipyridine) [Fe(Htrz)2(trz)](BF4)] (Htrz 1H-1,2,4-triazole) thin films . This is highly variable depending on mechanism driving state, substrate device geometry. Simply stated, choice used to build not only factor determining state.
Here, we examine the conductance changes associated with change in spin state a variety of different structures, using example crossover complex [Fe(H2B(pz)2)2(bipy)] (pz = (pyrazol-1-yl)-borate and bipy 2,2′-bipyridine) [Fe(Htrz)2(trz)](BF4)] (Htrz 1H-1,2,4-triazole) thin films. This is highly variable depending on mechanism driving state, substrate, device geometry. Simply stated, choice used to build not only factor determining state.
The [Co(SQ)2(4-CN-py)2] complex exhibits dynamical effects over a wide range of temperature. orbital moment, determined by X-ray magnetic circular dichroism (XMCD) with decreasing applied field, indicates nonzero critical field for net alignment moments, an effect not seen the spin moment [Co(SQ)2(4-CN-py)2].