A5060559201- Magnetic properties of thin films
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- Quantum and electron transport phenomena
- Electrocatalysts for Energy Conversion
- Metallic Glasses and Amorphous Alloys
- Nanowire Synthesis and Applications
- Photonic and Optical Devices
- Near-Field Optical Microscopy
- Catalysts for Methane Reforming
- Quantum Information and Cryptography
- Graphene research and applications
- Magnetic Properties of Alloys
- Advanced Battery Materials and Technologies
- Carbon Nanotubes in Composites
- Advanced battery technologies research
- Electrochemical Analysis and Applications
- Advanced Surface Polishing Techniques
- Force Microscopy Techniques and Applications
- Dielectric materials and actuators
- Business and Management Studies
- Nanoplatforms for cancer theranostics
- Boron and Carbon Nanomaterials Research
- Surface and Thin Film Phenomena
- Anodic Oxide Films and Nanostructures
Lawrence Berkeley National Laboratory
2015-2025
Berkeley College
2015-2018
Nanōmix (United States)
2003-2005
University of California, Los Angeles
2004
California NanoSystems Institute
2004
Universidade de São Paulo
1989-1997
University of California, Berkeley
1996
Abstract Self-assembly has emerged as a powerful approach to generating complex supramolecular architectures. Despite there being many crystalline frameworks reported in the solid state, construction of highly soluble periodic networks three-dimensional space is still challenge. Here we demonstrate that encapsulation motif, which involves dimerization two aromatic units within cucurbit[8]uril, can be used direct co-assembly tetratopic molecular block and cucurbit[8]uril into organic...
Using selective post-fabrication etching, different ratios of TLS and other resonator losses are associated with the silicon niobium surface oxides, while coherent lifetime is increased by a factor five.
Abstract The use of inorganic nanofillers has been an effective method to improve high‐temperature capacitive performance dielectric polymers, though there are unmet challenges such as undesirable organic–inorganic compatibility, and low efficiencies energy densities. Herein, a surface functionalization strategy using covalent organic frameworks (COFs) is employed address in realizing high‐performing polymer composites. Specifically, core–shell structured nanoparticles, where ZrO 2...
Abstract Multiphoton imaging techniques that convert low-energy excitation to higher energy emission are widely used improve signal over background, reduce scatter, and limit photodamage. Lanthanide-doped upconverting nanoparticles (UCNPs) among the most efficient multiphoton probes, but even UCNPs with optimized lanthanide dopant levels require laser intensities may be problematic. Here, we develop protein-sized, alloyed (aUCNPs) can imaged individually at >300-fold lower than needed for...
Solid-state batteries (SSBs) that incorporate the argyrodite-Li6PS5Cl (LPSCl) electrolyte hold potential as substitutes for conventional lithium-ion (LIBs). However, mismatched interface between LPSCl and electrodes leads to increased interfacial resistance rapid growth of lithium (Li) dendrites. These factors significantly impede feasibility their widespread industrial application. In this study, we developed a composite LPSCl/polymer enhance contact suppress dendrite formation at grain...
In this work, we demonstrate that catalyst composition can be used to direct the crystallographic growth axis of GaN nanowires. By adjusting ratio gold nickel in a bimetallic catalyst, achieved selective dense, uniform nanowire arrays along two nonpolar directions. A gold-rich resulted single-crystalline ⟨11̅00⟩ or m axis, whereas nickel-rich ⟨112̅0⟩ axis. The same control was demonstrated on different epitaxial substrates. Using proper conditions, many nanowires were observed switch...
Near-field scanning optical microscopy enables the simultaneous topographical and subdiffraction limited imaging of surfaces. A process is presented for implementation single individually engineered gold cones at tips atomic force cantilevers. These cantilevers act as novel high-performance near-field probes. In fabrication, thin-film metallization, electron beam induced deposition etch masks, Ar ion milling are combined. The cone constitutes a well-defined highly efficient antenna with tip...
Micron-sized lasers fabricated from upconverting nanoparticles (UCNP) coupled to whispering gallery mode (WGM) microresonators can exhibit continuous-wave anti-Stokes lasing useful for tracking cells, environmental sensing, and coherent stimulation of biological activity. The integration these microlasers into organisms microelectronics requires even smaller diameters, however, which raises threshold pump powers beyond practical limits applications. To meet the need low thresholds high...
Abstract A dynamic coordinative‐directed solubilization of single‐walled carbon nanotubes (SWNTs) in aqueous solutions has been achieved through a combination Zn II metalloporphyrin complex and cis ‐protected Pd complex, which are believed to form charged acyclic and/or cyclic adducts on or around the side walls SWNTs. The SWNTs solution only occurs when these complexes allowed enter simultaneously into self‐assembly process with under mild conditions. solubility properties that confer upon...
Local conductance behavior of various moiré lattices, superstructures, and Kagome-like are resolved down to sub–5 nm.
The enzymatic degradation of starch can be monitored electronically using single-walled carbon nanotubes (SWNTs) as semiconducting probes in field-effect transistors (FETs). Incubation these devices aqueous buffer solutions amyloglucosidase (AMG) results the removal from both silicon surfaces and side walls SWNTs FETs, evidenced by direct imaging electronic measurements.
Nacre-mimetic materials are of great interest, but difficult to synthesize, because they require the ordering organic and inorganic on several length scales. Here we introduce peptoid nanosheets as a versatile two-dimensional platform develop nacre mimetic materials. Free-floating zwitterionic were mineralized with thin films amorphous calcium carbonate (of 2-20 nm thickness) their surface produce planar synthons. These can serve tunable building blocks layered brick mortar nanoarchitectures.
As superconducting quantum processors increase in complexity, techniques to overcome constraints on frequency crowding are needed. The recently developed method of laser-annealing provides an effective post-fabrication adjust the qubits. Here, we present automated apparatus based conventional microscopy components and demonstrate preservation highly coherent transmons. In addition, perform noise spectroscopy investigate change defect features, particular, two-level system defects, after...
Abstract Cobalt is an efficient catalyst for Fischer−Tropsch synthesis (FTS) of hydrocarbons from syngas (CO + H 2 ) with enhanced selectivity long-chain when promoted by Manganese. However, the molecular scale origin enhancement remains unclear. Here we present experimental and theoretical study using model catalysts consisting crystalline CoMnO x nanoparticles thin films, where Co Mn are mixed at sub-nm scale. Employing TEM in-situ X-ray spectroscopies (XRD, APXPS, XAS), determine...
Tellurium (Te) is attractive for p-channel transistors due to its high hole mobility. Despite having a low thermal budget suitable back-end-of-line (BEOL) monolithic integration, the practical realization of Te hindered by stability. In this work, we investigate stability thin films grown via scalable evaporation. Our findings identify ruthenium as more thermally stable contact p-type transistors, capable withstanding temperatures up 250 °C. Ruthenium exhibits significantly lower diffusivity...
Renewable hydrogen generation from water electrolysis offers a viable path to decarbonization if the costs can be reduced. The iridium-based anode catalyst is one of most expensive components in electrolyzers. We propose reducing iridium usage by substituting Ir with Co, more affordable metal, mixed oxide phase enhance catalytic activity while minimizing consumption. A modified surfactant-assisted Adams fusion synthesis technique was developed as scalable method for producing IrCo...
Abstract Synchrotron x-ray spectroscopy was employed to determine the effects of nanostructuring on electronic band structure in V2O5, a promising cathode material and widely used catalyst. V2O5 nanoparticle powders were characterized via P-XRD, TEM, diffuse reflectance UV-Vis-NIR confirm optical bandgap. XES revealed valence O 2p states be upshifted relative bulk, while XAS RIXS showed lowest V 3d conduction static. Together, these changes (in conjunction with an increased density...
Qubits made from superconducting materials are a mature platform for quantum information science application such as computing. However, materials-based losses now limiting factor in reaching the coherence times needed applications. In particular, knowledge of atomistic structure and properties circuit is to identify, understand, mitigate decoherence channels. this work we characterize atomic native oxide film formed on Nb resonators by comparing fluctuation electron microscopy experiments...