A5041730677- Quantum Dots Synthesis And Properties
- Catalytic Cross-Coupling Reactions
- Catalytic C–H Functionalization Methods
- Chalcogenide Semiconductor Thin Films
- Molecular Junctions and Nanostructures
- Advanced Nanomaterials in Catalysis
- Nanowire Synthesis and Applications
- Micro and Nano Robotics
- Nanoplatforms for cancer theranostics
- Synthesis and Catalytic Reactions
- Microfluidic and Bio-sensing Technologies
- Microbial Fuel Cells and Bioremediation
- Synthesis of Indole Derivatives
- Advanced biosensing and bioanalysis techniques
- Alkaloids: synthesis and pharmacology
- Perovskite Materials and Applications
- Semiconductor materials and devices
- Electronic and Structural Properties of Oxides
- Characterization and Applications of Magnetic Nanoparticles
- ZnO doping and properties
University of Chicago
2019-2021
University of California, Berkeley
2016-2021
We have investigated the relationship between driving force and rate for interfacial hole transfer from quantum dots (QDs). This is experimentally explored by using six distinct molecular acceptors with an 800 meV range in force. Specifically, we ferrocene derivatives alkyl thiol moieties that strongly bind to surface of cadmium chalcogenide QDs. The redox potentials these ligands are controlled functionalization cyclopentadiene rings on electron withdrawing donating substituents, thus...
The effect of temperature on the rate hole transfer from photoexcited quantum dots (QDs) is investigated by measuring driving force dependence charge for different sized QDs across a range temperatures 78 to 300 K. Spherical CdSe/CdS core/shell were used with series ferrocene-derived molecular acceptors an 800 meV in electrochemical potential. Time-resolved photoluminescence measurements and yield integrating sphere both performed K obtain temperature-dependent rates forces as dictated...
We describe herein formal syntheses of the indole alkaloids cis-trikentrin A and herbindole B from a common meso-hydroquinone intermediate prepared by ruthenium-catalyzed [2+2+1+1] cycloaddition that has not been used previously in natural product synthesis. Key steps include sterically demanding Buchwald-Hartwig amination as well unique C(sp(3) )-H amination/indole formation. Studies toward selective desymmetrization are also reported.
The effect of lattice fluctuations and electronic excitations on the radiative rate is demonstrated in CdSe/CdS core/shell spherical quantum dots (QDs). Using a combination time-resolved photoluminescence spectroscopy atomistic simulations, we show that can change over temperature range from 78 to 300 K. We posit presence interface plays significant role dictating this behavior. other major factor underpins with higher energy states corresponding electron excitation into shell. These effects...
The rolling motion (i.e., longitudinal rotation) of nanomaterials may serve as a proxy to probe microscopic environments. Furthermore, nanoscale rotations in biological systems are common but difficult measure. Here, we report new tool that measures nanowire with short arm grown at one end. We present particle detection algorithm subpixel resolution and image segmentation principal component analysis enables precise automated determination the orientation. show nanowires' dynamics can be...
Abstract We describe herein formal syntheses of the indole alkaloids cis ‐trikentrin A and herbindole B from a common meso ‐hydroquinone intermediate prepared by ruthenium‐catalyzed [2+2+1+1] cycloaddition that has not been used previously in natural product synthesis. Key steps include sterically demanding Buchwald–Hartwig amination as well unique C(sp 3 )−H amination/indole formation. Studies toward selective desymmetrization are also reported.
Hydrogen peroxide (H2O2) plays diverse biological roles, and its effects in part depend on spatiotemporal presence, both intra- extracellular contexts. A full understanding of the physiological H2O2 healthy disease states is hampered by a lack tools to controllably produce H2O2. Here, we address this issue showing visible-light-induced production exogenous free-standing, gold-decorated silicon nanowires internalized human umbilical vein endothelial cells. We further show that photocatalytic...
Computational models have been developed that can accurately predict the electronic structure and thus optical properties of a variety quantum dot (QD) materials. However, application these to core/shell other heterostructured QDs has received less experimental corroboration owing difficulty in systematically synthesizing characterizing large ranges geometries. In current work, we synthesized library CdSe/CdS with varying core sizes shell thicknesses, characterized their radiative...
Abstract The synthetic tunability of semiconductor nanowires has enabled researchers to apply these materials in a variety applications from energy harvesting biological stimulation. One the most intensely researched areas is synthesis branched nanowires, or nano-tree structures, owing their high surface area. In this paper, we present protocol that enables growth ultra-thin nanowire branches on primary nanowire. Specifically, method yields tightly distributed branches, whose locality unique...
Abstract Formal syntheses of racemic cis‐trikentrin A and herbindole B ((I) (II), resp.) are reported starting from the acetonide cis‐5,6‐dihydroxy‐endo‐norborn‐2‐ene with Buchwald‐Hartwig amination novel C(sp 3 )‐H amination/indole formation as key steps.