A5008990793- Carbon Nanotubes in Composites
- Graphene research and applications
- Thermal properties of materials
- 2D Materials and Applications
- Mechanical Behavior of Composites
- Advanced Sensor and Energy Harvesting Materials
- Nuclear Materials and Properties
- Supercapacitor Materials and Fabrication
- Advanced Thermoelectric Materials and Devices
- Composite Material Mechanics
- Electrocatalysts for Energy Conversion
- Polymer composites and self-healing
- Boron and Carbon Nanomaterials Research
- Fiber-reinforced polymer composites
- Advancements in Battery Materials
- MXene and MAX Phase Materials
- Thermal Radiation and Cooling Technologies
- Composite Structure Analysis and Optimization
- Quantum Dots Synthesis And Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- High Temperature Alloys and Creep
- Fuel Cells and Related Materials
- Conducting polymers and applications
- Numerical methods in engineering
- Polymer Nanocomposites and Properties
United States Air Force Research Laboratory
2015-2024
Wright-Patterson Air Force Base
2015-2024
National Metallurgical Laboratory
2023
Indian Institute of Technology Kharagpur
2023
National Institute for Materials Science
2023
Indian Institute of Science Bangalore
2023
U.S. Air Force Research Laboratory Materials and Manufacturing Directorate
2006-2022
United States Air Force Academy
2020
Universal Technical Institute
2008-2019
Universal Technology Corporation (United States)
2008-2019
A facile approach has been developed to prepare B,N co-doped graphene with tuneable composition simply by thermal annealing oxide in the presence of boric acid and ammonia. The resultant BCN (see picture; C gray, H white, B pink, N blue) superior electrocatalytic activity over commercial Pt/C electrocatalysts for oxygen reduction reaction alkaline media. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited...
A single-compound source of B, C, and N was used for the growth vertically aligned BCN (VA-BCN) nanotubes (NTs). Owing to a synergetic effect co-doping C (CNTs) with VA-BCN NTs show significantly improved electrocatalytic activity (e.g., current density) oxygen reduction reaction compared undoped VA-CNTs, CNTs doped only B or (VA-BCNT, VA-NCNT), commercial Pt/C electrocatalyst (see picture). Detailed facts importance specialist readers are published as "Supporting Information". Such...
Molecular modeling of thermosetting polymers has been presented with special emphasis on building atomistic models. Different approaches to build highly cross-linked polymer networks are discussed. A multistep relaxation procedure for relaxing the molecular topology during cross-linking is proposed. This methodology then applied an epoxy-based thermoset (EPON-862/DETDA). Several materials properties such as density, glass transition temperature, thermal expansion coefficient, and volume...
Transparent and/or stretchable energy storage devices have attracted intense attention due to their unique optical mechanical properties as well intrinsic function. However, it remains a great challenge integrate transparent and into an device because the currently developed electrodes are either or stretchable, but not both. Herein, we report simple method fabricate wrinkled graphene with high stretchability transparency. The resultant sheets were used both current collector electrode...
We have developed a rational strategy for creating the 3D pillared vertically aligned carbon nanotube (VACNT)-graphene architectures by intercalated growth of VACNTs into thermally expanded highly ordered pyrolytic graphite (HOPG). By controlling fabrication process, length VACNT pillars can be tuned. In conjunction with electrodeposition nickel hydroxide to introduce pseudocapacitance, these VACNT–graphene controllable were demonstrated show high specific capacitance and remarkable rate...
The establishment of covalent junctions between carbon nanotubes (CNTs) and the modification their straight tubular morphology are two strategies needed to successfully synthesize nanotube-based three-dimensional (3D) frameworks exhibiting superior material properties. Engineering such 3D structures in scalable synthetic processes still remains a challenge. This work pioneers bulk synthesis macroscale nanotube elastic solids directly via boron-doping strategy during chemical vapour...
Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior thermal properties. Both systems, however, exhibit significant anisotropy in conduction, limiting performance three-dimensional transport materials. From management perspective, one way tailor this is consider designing alternative carbon-based architectures. This paper investigates the such novel architecture-a pillared-graphene (PG) network...
Using a modified chemical vapor deposition (CVD) method, we have prepared class of new graphene foams (GFs) doped with nitrogen, boron or both. Nitrogen-doped (N-GFs) nitrogen doping level 3.1 atom% were by CVD CH4 in the presence NH3 while boron-doped (B-GFs) 2.1 produced using toluene and triethyl borate as carbon source. On other hand, co-doped (4.5 atom%) (3 (BN-GFs) melamine diborate precursor. In all cases, scanning electron microscope (SEM) images revealed well-defined foam-like...
The creation of three-dimensionally engineered nanoporous architectures via covalently interconnected nanoscale building blocks remains one the fundamental challenges in nanotechnology. Here we report synthesis ordered, stacked macroscopic three-dimensional (3D) solid scaffolds graphene oxide (GO) fabricated chemical cross-linking two-dimensional GO blocks. resulting 3D network solids form highly porous structures, and controlled reduction these structures leads to formation conductive...
One-dimensional (1D) carbon nanotubes (CNTs) and 2D single-atomic layer graphene have superior thermal, electrical, mechanical properties. However, these nanomaterials exhibit poor out-of-plane properties due to the weak van der Waals interaction in transverse direction between graphitic layers. Recent theoretical studies indicate that rationally designed 3D architectures could desirable while maintaining in-plane by growing CNTs into with a seamless nodal junction. experimental realization...
Abstract Recently, carbon‐based metal‐free electrocatalysts (C‐MFECs) have drawn considerable research attention because of their attractive physicochemical characteristics, cost‐effectiveness, and ability to convert store energy efficiently. Efficient intramolecular charge transfer among different parts the carbon electrocatalyst and/or intermolecular between electrolyte dictate ultimate conversion performance. Experimental results theoretical analyses demonstrated that rational design...
Partially coating perpendicularly aligned carbon nanotube arrays with an appropriate polymer thin film along their tube length provides a novel concept for developing new sensors of high sensitivity, good selectivity, and excellent environmental stability the detection broad class chemical vapors low power consumption. The absorption desorption by matrix cause changes in inter-tube distance and, hence, surface resistance across film. Simple measurements change, therefore, constitute...
Einen einfachen Zugang zu B,N-dotiertem Graphen mit einstellbarer Zusammensetzung eröffnet das Tempern von Graphenoxid in Gegenwart Borsäure und Ammoniak. Das gebildete BCN-Graphen (siehe Bild; C grau, H weiß, B rosa, N blau) ist bei der Sauerstoffreduktion alkalischem Milieu ein aktiverer Katalysator als kommerzielle Pt/C-Elektrokatalysatoren.
Abstract Wurtzite Zinc-Oxide ( w -ZnO) is a wide bandgap semiconductor that holds promise in power electronics applications, where heat dissipation of critical importance. However, large discrepancies exist the literature on thermal conductivity -ZnO. In this paper, we determine -ZnO using first-principles lattice dynamics and compare it to wurtzite Gallium-Nitride -GaN) – another important with same crystal structure similar atomic masses as values show differences (400 W/mK -GaN vs. 50 at...
Penta-graphene (PG) has been identified as a novel 2D material with an intrinsic bandgap, which makes it especially promising for electronics applications. In this work, we use first-principles lattice dynamics and iterative solution of the phonon Boltzmann transport equation (BTE) to determine thermal conductivity PG its more stable derivative - hydrogenated penta-graphene (HPG). As comparison, also studied effect hydrogenation on graphene conductivity. contrast graphene, leads dramatic...
A strategic approach toward functionalization can change properties: effect of the “oxidizer oxygen” on hexagonal boron nitride.
Eine einzige Verbindung aus B, C und N war der Ausgangspunkt für das Wachstum vertikal ausgerichteter BCN-Nanoröhren (VA-BCN-NTs). Dank einem synergistischen Effekt bei Codotierung von C-Nanoröhren (CNTs) mit B zeigen die VA-BCN-NTs eine deutlich höhere elektrokatalytische Aktivität (z. B. Stromdichte) Sauerstoffreduktion als nichtdotierte VA-CNTs, nur B- oder N-dotierte CNTs (VA-BCNT, VA-NCNT) ein kommerzieller Pt/C-Elektrokatalysator (siehe Bild).