A5071245113- Boron and Carbon Nanomaterials Research
- Nanowire Synthesis and Applications
- Advanced Chemical Physics Studies
- Gas Sensing Nanomaterials and Sensors
- GaN-based semiconductor devices and materials
- ZnO doping and properties
- Catalytic Processes in Materials Science
- Graphene research and applications
- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Surface and Thin Film Phenomena
- Analytical Chemistry and Sensors
- nanoparticles nucleation surface interactions
- Electrochemical Analysis and Applications
- Magnetic properties of thin films
- Electron and X-Ray Spectroscopy Techniques
- Boron Compounds in Chemistry
- Quantum Dots Synthesis And Properties
- Electrocatalysts for Energy Conversion
- Molecular Junctions and Nanostructures
- Electrochemical sensors and biosensors
- Gold and Silver Nanoparticles Synthesis and Applications
- Ion-surface interactions and analysis
- Magnetic Properties and Synthesis of Ferrites
- Semiconductor materials and interfaces
Oklahoma State University
2017-2025
Oklahoma State University Oklahoma City
2016-2024
Stillwater (Canada)
2018-2020
University of Idaho
2008-2017
The Alfred Hospital
2017
Memorial Sloan Kettering Cancer Center
2011
Cornell University
2011
McMaster University
1997-2008
Freie Universität Berlin
1996-2008
University of Nebraska–Lincoln
1994-2008
Lead-free halide light-emitting diodes (LEDs) are fabricated using nontoxic and earth-abundant CsCu2I3 with a strong yellow emission at peak wavelength of 568 nm. CsCu2I3-based host–dopant emitters formed by vacuum thermal evaporation (VTE) film codeposition process instead the commonly used solution-based deposition process. Using VTE process, extremely thin (30 nm) have successfully been dopant various organic host molecules. A bright photoluminescence quantum yield value 84.8% is achieved...
Amorphous silicon carbide nanosprings, as well biphase (crystalline core/amorphous sheath) helical nanowires, have been synthesized by plasma enhanced chemical vapor deposition. Both variants grow via the vapor−liquid−solid mechanism. The formation of amorphous nanosprings is explained in terms contact angle anisotropy model initially proposed to explain boron nanosprings. A modified model, where presence temperature gradients within catalyst are imposed, has nanowires. basis for this that...
The transition from linear to helical growth of amorphous boron carbide nanowires has been examined with high-resolution transmission electron microscopy. Based on the observed changes iron catalyst at point growth, a model solid developed based work adhesion metallic tip nanowire. This demonstrates that contact angle anisotropy catalyst/wire interface drives growth. is introduced when radius droplet (R) exceeds nanowire (ρ), and center mass metal displaced laterally central axis
Electrical properties of a chemical sensor constructed from mats GaN nanowires decorated with gold nanoparticles as function exposure to Ar, N2, and methane are presented. The Au nanoparticle exhibited chemically selective electrical responses. exhibits nominal response Ar slightly greater for N2. Upon the conductivity is suppressed by 50% relative vacuum. effect fully reversible independent history. We offer model which change in current caused depletion depth nanowires, being due an...
We present a novel method of radio frequency (RF)-mediated thermotherapy in tumors by remotely heating nickel (Ni)–gold (Au) core–shell nanowires (CSNWs). Ectopic pancreatic were developed nude mice to evaluate the thermotherapeutic effects on tumor progression. Tumor ablation was produced RF-mediated via activation paramagnetic properties Ni–Au CSNWs. Histopathology demonstrated that heat generated RF irradiation caused significant cellular death with pyknotic nuclei and nuclear...
Nanomechanical bending behavior and elastic modulus of silver nanowires (65–140nm∅) suspended across silicon microchannels were investigated using digital pulsed force mode (DPFM) atomic microscopy through coincident imaging profiling. Deflection profiles analyzed off-line demonstrate the role nanowire shape symmetry in experimentally determining boundary conditions, eliminating need to rely on isolated midpoint measurements usual assumptions for supported-end behavior. Elastic moduli...
Enzyme microreactors are important tools of miniaturized analytics and have promising applications in continuous biomanufacturing. A fundamental problem their design is that plain microchannels without extensive static internals, or packings, offer limited exposed surface area for immobilizing the enzyme. To boost immobilization a manner broadly applicable to enzymes, we coated borosilicate with silica nanosprings attached enzyme, sucrose phosphorylase, via silica-binding module genetically...
An in-depth analysis of the chemical functionality in HCl-doped polyaniline (PANI) nanopowders is discussed through interpretations x-ray photoelectron spectra. The distinctions between three PANI sample types, produced under varied synthesis conditions, are compared on basis correlations newly collected electron spectra for (or also spectroscopy) and electromagnetic (EM) shielding effectiveness (SE) within two frequency bands (100–1500 MHz ∼2–14 GHz). findings with reference to previous...
Controlling and tuning activity selectivity in catalysis are important for the development of energy-efficient environmentally friendly catalytic processes applications such as chemical synthesis, pollution mitigation, energy conversion storage. In that vein, plasmonic dielectric Mie resonance-mediated photocatalyses have emerged promising approaches. Although numerous reports past decade shown use resonances activity, on demonstration tunable product rather limited. Also, it remains a major...
Nanosprings are a new form of nanowires that have potential applications in nanoelectronics, nanomechanics, and nanoelectromechanical systems. In this review we will examine the growth mechanism these novel nanostructures. The synthesis by vapour–liquid–solid mechanism, first proposed Wagner Ellis, be explored then extended to development model explain formation nanosprings.
The morphology, crystallinity, and photoconductive properties of gallium nitride films grown by pulsed chemical vapor deposition on p-type Si(100) with without ammonia (NH3) pretreatment are investigated. Ammonia pretreatments were performed at 525 °C 800 °C, which resulted in GaN film thicknesses 80 140 nm, respectively. An amorphous is obtained a polycrystalline pretreatment. X-ray photoelectron spectroscopy showed that the results 1–2 nm bilayer consisting SiNx SiOxNy GaN/Si interface....
In this study we report a novel technology for synthesizing silica-based nanosprings with yield higher than 90%, and 100% repeatability. The nanospring mats are grown via the liquid–vapour–solid mechanism using gold catalyst, where deposition temperature can be as low 350 ◦ C. XPS analysis shows that as-grown have components of silicon oxygen an atomic ratio close to silica. Both SEM TEM images illustrate helical structure is extremely uniform. Tw ot ypes observed TEM. first type silica...
Nanowires and nanorods of magnetite (Fe3O4) are interest due to their varied biological applications but most importantly for use as magnetic resonance imaging contrast agents. One-dimensional (1D) structures magnetite, however, more challenging synthesize because the surface energy favors formation isotropic structures. Synthetic protocols can be dichotomous, producing either 1D structure or phase not both. Here, superparamagnetic Fe3O4 were prepared in solution by reduction iron...
The electronic band structure and the local screening effects of transition-metal perovskites ${\mathrm{La}}_{0.65}{A}_{0.35}\mathrm{Mn}{\mathrm{O}}_{3}$ ($A=\mathrm{Ba}\mathrm{and}\mathrm{Ca}$) have been examined across coupled magnetic-metallic phase transition using techniques angle-resolved photoemission, resonance inverse photoemission. Temperature-dependent shifts ${e}_{g}$ ${t}_{2g}$ bands ${\mathrm{La}}_{0.65}$${\mathrm{Ca}}_{0.35}$Mn${\mathrm{O}}_{3}$ observed. These changes in...
We have successfully nickel doped a boron carbide (B5C) alloy film. The boron-carbide (Ni-B5C1+δ) thin films were fabricated from single source carborane cage molecule and nickelocene [Ni(C5H5)2] using plasma enhanced chemical vapor deposition. Nickel doping transforms the highly resistive undoped film p-type material to an n-type material. This has been verified characteristics of diodes constructed ofNi-B5C1+δ on both silicon B5C. homojunction exhibit excellent rectifying properties over...
Abstract The use of silicon dioxide (SiO 2 ) nanosprings as supports for immobilized enzymes in a continuous microreactor is described. A nanospring mat (2.2 cm × 60 μm thick) was functionalized with γ‐aminopropyltriethoxysilane, then treated N ‐succinimidyl‐3‐(2‐pyridyldithio)‐propionate (SPDP) and dithiothreitol (DTT) to produce surface thiol (SH) groups. SPDP‐modified β‐galactosidase from Aspergillus oryzae on the thiolated by reversible disulfide linkages. enzyme‐coated placed into...