A5087225616- nanoparticles nucleation surface interactions
- Graphene research and applications
- Advanced Chemical Physics Studies
- Catalytic Processes in Materials Science
- Surface and Thin Film Phenomena
- Analytical Chemistry and Sensors
- Chemical and Physical Properties of Materials
- Electrochemical sensors and biosensors
- 2D Materials and Applications
- Crystallization and Solubility Studies
- Astrophysics and Star Formation Studies
- Advanced Sensor and Energy Harvesting Materials
- Electronic and Structural Properties of Oxides
- Metallurgical and Alloy Processes
- Astro and Planetary Science
- Advancements in Battery Materials
- MXene and MAX Phase Materials
- Copper Interconnects and Reliability
- Nanocluster Synthesis and Applications
- Advanced Photocatalysis Techniques
- Molecular Spectroscopy and Structure
- Electrochemical Analysis and Applications
- Catalysts for Methane Reforming
- X-ray Diffraction in Crystallography
- Theoretical and Computational Physics
Iowa State University
2011-2024
Ames National Laboratory
2009-2024
Cornell University
2010-2018
Syracuse University
2011-2014
Beijing Computational Science Research Center
2011
Flexible graphene electronics are rapidly gaining interest, but their widespread implementation has been impeded by challenges with ink preparation, printing, and postprint annealing processes. Laser-induced (LIG) promises a facile alternative creating flexible on polyimide substrates through the one-step laser writing fabrication method. Herein, we demonstrate use of LIG, created low-cost UV laser, for electrochemical ion-selective sensing plant-available nitrogen (i.e., both ammonium...
The library of imine-linked covalent organic frameworks (COFs) has grown significantly over the last two decades, featuring a variety morphologies, pore sizes, and applications. An array synthetic methods been developed to expand scope COF functionalities; however, most these were designed introduce functional scaffolds tailored specific application. Having general approach diversify COFs via late-stage incorporation group handles would greatly facilitate transformation materials into...
Chronic restraint stress (CRS) induces the remodeling (i.e., retraction and simplification) of apical dendrites hippocampal CA3 pyramidal neurons in rats, suggesting that intrahippocampal connectivity can be affected by a prolonged stressful challenge. Since structural maintenance neuronal dendritic arborizations synaptic requires neurotrophic support, we investigated potential role brain derived factor (BDNF), neurotrophin enriched hippocampus released from an activity-dependent manner, as...
Graphene-based inks are becoming increasingly attractive for printing low-cost and flexible electrical circuits due to their high conductivity, biocompatibility, manufacturing scalability. Conventional graphene techniques, such as screen inkjet printing, limited by stringent ink viscosity requirements properties large as-printed line width that impedes the performance of printed biosensors. Here, we report an aerosol-jet-printed (AJP) graphene-based immunosensor capable monitoring two...
The integration of microfluidics and electrochemical cells is at the forefront emerging sensors energy systems; however, a fabrication scheme that can create both in scalable fashion still lacking. We present one-step, mask-free process to create, pattern, tune laser-induced graphene (LIG) with ubiquitous CO2 laser. laser parameters are adjusted LIG different electrical conductivity, surface morphology, wettability without need for postchemical modification. Such definitive control over...
Abstract Balancing kinetics, a crucial priority in catalysis, is frequently achieved by sacrificing activity of elementary steps to suppress side reactions and enhance catalyst stability. Dry reforming methane (DRM), process operated at high temperature, usually involves fast C-H activation but sluggish carbon removal, resulting coke deposition deactivation. Studies focused solely on innovation are insufficient addressing formation efficiently. Herein, we develop coke-free catalysts that...
Inkjet printed graphene (IPG) has recently shown tremendous promise in reducing the cost and complexity of circuit fabrication. Herein we demonstrate, for first time, fabrication an ion selective electrode (ISE) with IPG. A thermal annealing process a nitrogen ambient environment converts IPG into highly conductive (sheet resistance changes from 52.8 ± 7.4 MΩ/□ unannealed to 172.7 33.3 Ω/□ annealed at 950 °C). Raman spectroscopy field emission scanning electron microscopy (FESEM) analysis...
Abstract Effective control on chemoselectivity in the catalytic hydrogenation of C=O over C=C bonds is uncommon with Pd‐based catalysts because favored adsorption Pd surface. Here we report a unique orthorhombic PdSn intermetallic phase unprecedented toward hydrogenation. We observed formation and metastability this situ. During natural cooling process, nanoparticles readily revert to 3 Sn 2 phase. Instead, using thermal quenching method, prepared pure‐phase nanocatalyst. shows an >96 %...
Improving the qubit's lifetime (T1) is crucial for fault-tolerant quantum computing. Recent advancements have shown that replacing niobium (Nb) with tantalum (Ta) as base metal significantly increases T1, likely due to a less lossy native surface oxide. However, understanding formation mechanism and nature of both oxides still limited. Using aberration-corrected transmission electron microscopy energy loss spectroscopy, we found Ta oxide has fewer suboxides than Nb We observed an abrupt...
Hydrodeoxygenation (HDO) of three model compounds (i.e., anisole, 4-propylphenol, and 2-butanone) real lignin pyrolysis vapors was investigated at 673 K ∼1.7 bar H2 over a series MoO3/γ-Al2O3 catalysts with MoO3 loadings ranging from 0 to 19 wt % as well bulk MoO3. Extensive characterization revealed catalyst acidity (strength) the degree MoOx oligomerization two main parameters in determining product distribution. Strong Lewis acid sites γ-Al2O3 were found catalyze transalkylation,...
In the interstellar medium (ISM), an important channel of water formation is reaction atoms on surface dust grains. Here, we report a laboratory study via O+D network. While prior studies were done ices, as appropriate to in dense clouds, explored how occurs bare surfaces, i.e., conditions mimicking transition from diffuse clouds (Av ∼ 1–5). Reaction products detected during deposition and afterward when sample brought high temperature. We quantified intermediary products, such D2O2, over...
Transition-metal phosphides (TMP) have been identified as promising electrocatalysts for the hydrogen evolution reaction (HER). Despite recent computational investigations identifying P sites being crucial adsorption, main mode of optimization TMPs has focused on changing metal sites. To experimentally verify hypotheses and provide a route HER electrocatalyst via ternary compounds, we performed systematic experimental studies structurally related NiSi1–xPx phases, namely, Ni2SiP, Ni5Si2P3,...
We present an extensive experimental study of the conditions under which Cu forms encapsulated islands top surface layers graphite, as a result physical vapor deposition on argon-ion-bombarded graphite. When substrate is held at 800 K during deposition, are optimal for formation multilayer islands. Deposition temperatures below 600 favor adsorbed clusters, while above different type feature that probably single-layer intercalated island. The characterized with respect to size and shape,...
Precisely controlled synthesis strategies to prepare anisotropic nanomaterials with high yield and easy operation are exceedingly in demand because hybrid structures often introduce novel properties that cannot be achieved by isotropic nanomaterials. Here, a one-pot, two-step hot injection method was developed Cu6Sn5–Sn intermetallic–metal nanoparticles an structure. Hybrid distinguishable Sn Cu6Sn5 domains were formed under mild temperature. Different compositions of Cu6Sn5, ranging from...
SrTiO 3 and aluminum-doped are synthesized by calcination of metal salts dissolved in a deep eutectic solvent (DES) without any post-synthesis treatment.
Boron monoxide (BO), prepared by the thermal condensation of tetrahydroxydiboron, was first reported in 1955; however, its structure could not be determined. With recent attention on boron-based two-dimensional materials, such as borophene and hexagonal boron nitride, there is renewed interest BO. A large number stable BO structures have been computationally identified, but none are supported experiments. The consensus that material likely forms a boroxine-based material. Herein, we apply...
Surface reactions involving atomic oxygen have attracted much attention in astrophysics and astrochemistry, but two of the most fundamental surface processes, desorption diffusion, are not well understood. We studied diffusion on or from amorphous silicate surfaces under simulated interstellar conditions using a radio-frequency dissociated beam. Temperature programmed (TPD) experiments were performed to study formation ozone reaction molecular deposited silicate. It is found that begins...
Facile nucleation and growth of bilayer Ag(110) islands on NiAl(110) is observed by STM for Ag deposition at temperatures as low 127 K. Density functional theory analysis supported films determines adatom adsorption energies (which favor islands), interaction energies, diffusion barriers. Analysis an atomistic lattice-gas model incorporating these elucidates the role strongly anisotropic interactions in enabling upward mass transport needed island formation.