A5050469342- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Carbon Nanotubes in Composites
- Gold and Silver Nanoparticles Synthesis and Applications
- Polymer Nanocomposites and Properties
- Nanocluster Synthesis and Applications
- Luminescence and Fluorescent Materials
- Synthetic Organic Chemistry Methods
- Catalysis and Oxidation Reactions
- Polydiacetylene-based materials and applications
- Crystal Structures and Properties
- Nanomaterials for catalytic reactions
- Catalytic Processes in Materials Science
- Copper-based nanomaterials and applications
- Fullerene Chemistry and Applications
- Organometallic Complex Synthesis and Catalysis
- biodegradable polymer synthesis and properties
- Laser-Ablation Synthesis of Nanoparticles
- Surface Chemistry and Catalysis
- Nanoparticle-Based Drug Delivery
- Nanotechnology research and applications
Columbia University
2019-2024
Rochester Institute of Technology
2017
1-Octadecene is a widely used solvent for high-temperature nanocrystal synthesis (120–320 °C). Here, we show that 1-octadecene spontaneously polymerizes under these conditions, and the resulting poly(1-octadecene) has comparable solubility size to nanocrystals stabilized by hydrophobic ligands. Typical purification procedures (precipitation/redispersion cycles or exclusion chromatography) fail separate impurity from product. To avoid formation of poly(1-octadecene), replace with saturated,...
A library of thio- and selenourea derivatives is used to adjust the kinetics PbE (E = S, Se) nanocrystal formation across a 1000-fold range (
ZnS nanocrystals (λmax(1Se–1S3/2h) = 260–320 nm, d 1.7–10.0 nm) are synthesized from Zn(O2CR)2 (O2CR tetradecanoate, oleate and 2-hexyldecanoate), N,N′-disubstituted N,N′,N′-trisubstituted thioureas, P,P,N-trisubstituted phosphanecarbothioamides. The influence of precursor substitution, ligand sterics, reaction temperature on the final nanocrystal size was evaluated. Using saturated hydrocarbon solvents aliphatic carboxylate ligands, polymeric byproducts could be avoided pure isolated....
Au nanoparticles (NP) on TiO2 have been shown to be effective catalysts for selective oxidation reactions by using molecular oxygen. In this work, we studied the influence of support morphology catalytic activity Au/TiO2 catalysts. Two anatase supports, a nanoplatelet-shaped material with predominantly {001} facet exposed and truncated bipyramidal-shaped nanoparticle {101} exposed, were prepared nonaqueous solvothermal method characterized DRIFTS, XPS, TEM. deposited supports...
Modern syntheses of colloidal nanocrystals yield extraordinarily narrow size distributions that are believed to result from a rapid "burst nucleation" (La Mer, JACS, 1950, 72(11), 4847-4854) followed by diffusion limited growth and distribution focusing (Reiss, J. Chem. Phys., 1951, 19, 482). Using combination in situ X-ray scattering, optical absorption, 13C nuclear magnetic resonance (NMR) spectroscopy, we monitor the kinetics PbS solute generation, nucleation, crystal three thiourea...
A one pot synthesis of blue and green emissive CdZnSSe quantum dots (QDs) from thio- selenoureas Cd Zn carboxylates is optimized using high throughput robotic optimization. large set spectral data (N = 192) used to train machine learning models that accurately predict the photoluminescence emission wavelength (λmax) full-width half-maximum, relative yield (PLQY) S:Se Zn:Cd stoichiometries reaction time. ZnS shells are deposited on crude QD heterostructures 4-tert-butylbenzyl mercaptan, a...
<p>1-octadecene is a widely used solvent for high temperature nanocrystal synthesis (120 – 320 °C). Here, we show that 1-octadecene spontaneously polymerizes under these conditions and the resulting poly(1-octadecene) has comparable solubility size to nanocrystals stabilized by hydrophobic ligands. Typical purification procedures (precipitation/redispersion cycles or exclusion chromatography) fail separate impurity from product. To avoid formation of poly(1-octadecene), replaced with...
1-octadecene is a widely used solvent for high temperature nanocrystal synthesis (120 – 320 °C). Here, we show that spontaneously polymerizes under these conditions and the resulting poly(1-octadecene) has comparable solubility size to nanocrystals stabilized by hydrophobic ligands. Typical purification procedures (precipitation/redispersion cycles or exclusion chromatography) fail to separate the impurity from product. To avoid formation of poly(1-octadecene), we replaced with...
1-octadecene is a widely used solvent for high temperature nanocrystal synthesis (120 – 320 °C). Here, we show that spontaneously polymerizes under these conditions and the resulting poly(1-octadecene) has comparable solubility size to nanocrystals stabilized by hydrophobic ligands. Typical purification procedures (precipitation/redispersion cycles or exclusion chromatography) fail separate impurity from product. To avoid formation of poly(1-octadecene), replaced with saturated, aliphatic...