A5009614195- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- CO2 Reduction Techniques and Catalysts
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanocluster Synthesis and Applications
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Optical properties and cooling technologies in crystalline materials
- Digital Transformation in Industry
- Nanomaterials for catalytic reactions
- nanoparticles nucleation surface interactions
- Advanced Photocatalysis Techniques
- Sustainable Industrial Ecology
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advancements in Semiconductor Devices and Circuit Design
- Copper-based nanomaterials and applications
- Advanced Thermoelectric Materials and Devices
- Organic Light-Emitting Diodes Research
- Inorganic Chemistry and Materials
- Machine Learning in Materials Science
- Chemical and Physical Properties in Aqueous Solutions
- Chalcogenide Semiconductor Thin Films
Lam Research (United States)
2023-2024
University of California, Berkeley
2018-2022
Lawrence Berkeley National Laboratory
2018-2020
Material Sciences (United States)
2018
University of Warsaw
2015
Yale University
2015
University of New Haven
2015
We introduce a general surface passivation mechanism for cesium lead halide perovskite materials (CsPbX3, X = Cl, Br, I) that is supported by combined experimental and theoretical study of the nanocrystal chemistry. A variety spectroscopic methods are employed together with ab initio calculations to identify vacancies as predominant source charge trapping. The number traps per quantified 1H NMR spectroscopy, consistent simple trapping model in which create deleterious under-coordinated...
Replacing lead in halide perovskites is of great interest due to concerns about stability and toxicity. Recently, free double which the unit cell doubled two divalent cations are substituted by a combination mono- trivalent have been synthesized as bulk single crystals thin films. Here, we study optical properties all-inorganic cesium silver(I) bismuth(III) chloride bromide nanocrystals with perovskite crystal structure. The cube-shaped monodisperse size typical side lengths 8 15 nm....
Lead toxicity has sparked interest into alternative halide nanomaterials with properties similar to CsPbX3 perovskites. A promising suggested from bulk studies is the family of double perovskites form Cs2AgMX6. Here, we report synthesis colloidal Cs2AgInCl6 and Cs2AgSbCl6 nanocrystals via injection acyl halides a metal acetate solution under atmospheric conditions relatively mild temperatures. We demonstrate single-crystalline cubic ca. 10 nm side length their morphological similarities...
One of the bottlenecks to building semiconductor chips is increasing cost required develop chemical plasma processes that form transistors and memory storage cells
Monitoring of visible light sensitized reduction CO2 at Cu nanoparticles in aqueous solution by rapid-scan ATR FT-IR spectroscopy on the time scale seconds allowed structural identification a one-electron intermediate and demonstrated its kinetic relevancy for first time. Isotopic labeling (12C: 1632, 1358, 1346 cm–1; 13C: 1588, 1326, 1316 cm–1) revealed species carbon dioxide dimer radical anion structure, most likely bound to catalyst surface through carbon. Intermediacy Cu—C(═O)OCO2– is...
Colloidal cesium lead halide perovskite nanocrystals exhibit unique photophysical properties including high quantum yields, tunable emission colors, and narrow photoluminescence spectra that have marked them as promising light emitters for applications in diverse photonic devices. Randomly oriented transition dipole moments limited the outcoupling efficiency of all isotropic sources, perovskites. In this report we design synthesize deep blue emitting, confined, nanoplates analyze their...
Cu nanocrystals as catalysts for CO2 reduction are a subject of considerable contemporary interest, but their stability has not been considered extensively. Herein, we report on the reconstruction during and discuss factors influencing observed changes with computer-based quantitative analysis spectroscopic techniques. The timelines opposing phenomena, sintering declustering, previously reported separately, detailed focus two forces affecting final morphology: applied potential reaction...
The ability to predict and control the formation of bimetallic heterogeneous nanocrystals is desirable for many applications in plasmonics catalysis. Here, we report synthesis characterization stable, monodisperse, solution-processed Cu–Ag nanoparticles with specific but unusual elemental arrangements that are consistent a recently developed thermodynamic model. Using air-free scanning transmission electron microscopy energy-dispersive X-ray spectroscopy, distribution Cu Ag positions was...
Core-shell particles with thin noble metal shells represent an attractive material class potential for various applications ranging from catalysis to biomedical and pharmaceutical optical crystals. The synthesis of well-defined core-shell architectures remains, however, highly challenging. Here, we demonstrate that atomically-thin homogeneous platinum can be grown via a colloidal method on variety gold nanostructures spherical nanoparticles nanorods nanocubes. is based the exchange low...
The understanding of synthetic pathways bimetallic nanocrystals remains limited due to the complex energy landscapes and dynamics involved. In this work, we investigate formation self-limiting Cu@Ag core-shell nanoparticles starting from Cu followed by galvanic replacement with Ag ions. Bulk quantification atomic emission spectroscopy spatially resolved elemental mapping electron microscopy reveal distinct nucleation regimes that produce a tunable shell thickness, but only up certain...
Use of sodium dodecyl sulfate (SDS) during electrodeposition improves the mechanical stability and catalytic activity manganese dioxide for electrocatalytic water oxidation.