A5085040570- Graphene research and applications
- 2D Materials and Applications
- Advanced biosensing and bioanalysis techniques
- Diamond and Carbon-based Materials Research
- High-pressure geophysics and materials
- Nanowire Synthesis and Applications
- Graphene and Nanomaterials Applications
- Quantum and electron transport phenomena
- Quantum, superfluid, helium dynamics
- Software System Performance and Reliability
- Ga2O3 and related materials
- Sensor Technology and Measurement Systems
- Analytical Chemistry and Sensors
- Software Testing and Debugging Techniques
- MXene and MAX Phase Materials
- Software Engineering Research
- Quantum Dots Synthesis And Properties
- Rare-earth and actinide compounds
Harvard University
2023-2024
University of Pennsylvania
2019-2021
Bilayer two-dimensional (2D) van der Waals (vdW) materials are attracting increasing attention due to their predicted high quality electronic and optical properties. Here, we demonstrate dense, selective growth of WSe2 bilayer flakes by chemical vapor deposition with the use a 1:10 molar mixture sodium cholate chloride as promoter control local diffusion W-containing species. A large fraction showed 0 (AB) 60° (AA′) twist between two layers, whereas Moiré 15 30° angles were also observed....
Research on 2D materials is one of the core themes modern condensed matter physics. Prompted by experimental isolation graphene, much attention has been given to unique optical, electronic, and structural properties these materials. In past few years, semiconducting transition metal dichalcogenides (TMDs) have attracted increasing interest due such as direct band gaps intrinsically broken inversion symmetry. Practical utilization demands large-area synthesis. While films graphene now...
Abstract The large‐scale growth of semiconducting thin films on insulating substrates enables batch fabrication atomically electronic and optoelectronic devices circuits without film transfer. Here an efficient method to achieve rapid large‐area monolayer MoSe 2 based spin coating Mo precursor assisted by NaCl is reported. Uniform up a few inches in size are obtained within short time 5 min. as‐grown high quality with large grain (up 120 µm). Arrays field‐effect transistors fabricated from...
Graphene-based biosensors can be produced in a scalable manner at reasonable cost, and they show significant promise for sensitive detection of small molecules biomarkers such as proteins, single strand nucleic acids, drug targets. Here, we describe an approach that enables limit ~1 aM ssDNA target without amplification. We also sensor based on short (20mer) probe complementary to portion longer (100mer) provides enhanced sensitivity saturation signal level. Finally, graphene-based DNA...
Two-dimensional (2D) van der Waals superlattices comprised of two stacked monolayer materials have attracted significant interest as platforms for novel optoelectronic and structural behavior. Although studies are focused on superlattice fabrication, less effort has been given to the nanoscale patterning modification these systems. In this report, we demonstrate localized layer-by-layer thinning formation nanopores/defects in 2D superlattices, such MoS2-WS2 heterostructures chemical vapor...
By directly altering microscopic interactions, pressure provides a powerful tuning knob for the exploration of condensed phases and geophysical phenomena. The megabar regime represents an exciting frontier, where recent discoveries include novel high-temperature superconductors, as well structural valence phase transitions. However, at such high pressures, many conventional measurement techniques fail. Here, we demonstrate ability to perform local magnetometry inside diamond anvil cell with...
A simple technique of doping graphene by manipulating adsorbed impurity charges is presented. Using a field effect transistor configuration, controlled polarization ferroelectric polymer gate used to compensate and neutralize one type. The uncompensated the opposite type then dope graphene. Both n- p-type are possible this method, which non-destructive reversible. We observe change in n-type dopant concentration 8 × 1012 cm−2 electron mobility 650%. hole mobilities inversely proportional...
Abstract Most programming languages ignore the problem of undefined variables and permit compilers to allow leftover contents memory cells belonging such be referenced. Although efficient, this type semantics does not support software engineering, because defects might arise in subtle ways difficult locate. Two other types that better engineering are either initialize all some default, e.g. zero, or require references treated as errors. However, these obviously more expensive than simply...