|Office:||2101e Hach |
2438 Pammel Dr
BioThe Vela group is interested in the fabrication, characterization and properties of novel low dimensional materials. Our aim is to develop unique nanostructures, composites, and devices that are useful in solving important technological problems in energy conversion, catalysis, and biological imaging and tracking. Research in our group involves multidisciplinary projects and frequent collaborations with spectroscopic, computational, analytical, and biological groups. Our students acquire a broad set of skills in the synthesis and characterization of organic and inorganic molecular compounds, polymers, colloidal nanocrystals, and solid-state materials. Some of the techniques we use on a daily basis include inert atmosphere and vacuum manifolds, dry glove boxes, nuclear magnetic resonance spectroscopy, X-ray diffraction, transmission and scanning electron microscopies, optical absorption and photoluminescence spectroscopies, dynamic light scattering, and thermal analysis.
Peer-Reviewed Articles (40)
Expanding the I-II-V Phase Space: Soft Synthesis of Polytypic Ternary ...
Chemistry of Materials (2018)
Soft chemistry methods offer the possibility of synthesizing metastable and kinetic products that are unobtainable through thermodynamically-controlled, high-temperature reactions. A ...
Spatial–temporal spectroscopy characterizations and electronic structure of methylammonium perovskites
MRS Communications (2018)
Using time-resolved laser-scanning confocal microscopy and ultrafast optical pump/THz probe spectroscopy, we measure photoluminescence and THz-conductivity in perovskite micro-crystals and ...
Synthesis and Mixing of Complex Halide Perovskites by Solvent-Free Solid-State ...
Journal of Solid State Chemistry (2018)
Halide perovskites are exciting photoactive semiconductors with exceptional photovoltaic and optoelectronic properties. Literature in this area focuses on solution phase ...
Chalcogenide and Pnictide Nanocrystals from the Silylative Deoxygenationof Metal Oxides
Ames Laboratory Accepted Manuscripts (2017)
Transition metal chalcogenide and pnictide nanocrystals are of interest for optoelectronic and catalytic applications. Here, we present a generalized route ...
Germanium–Tin/Cadmium Sulfide Core/Shell Nanocrystals with Enhanced Near-Infrared ...
Chemistry of Materials (2017)
Ge1–xSnx alloy nanocrystals and Ge1–xSnx/CdS core/shell nanocrystals were prepared via solution phase synthesis, and their size, composition, and optical properties ...
Photophysical properties of wavelength-tunable methylammonium lead halide perovskite nanocrystals
Journal of Materials Chemistry C (2017)
We present the time-correlated luminescence of isolated nanocrystals of five methylammonium lead mixed-halide perovskite compositions (CH3NH3PbBr3−xIx) that were synthesized with ...
Phase-Programmed Nanofabrication: Effect of Organophosphite Precursor Reactivity on the Evolution ...
Chemistry of Materials (2015)
A better understanding of the chemistry of molecular precursors is useful in achieving more predictable and reproducible nanocrystal preparations. Recently, ...
Cu2ZnSnS4−Au Heterostructures: Toward Greener Chalcogenide- Based Photocatalysts
Journal of Physical Chemistry C (2014)
Chalcogenide-based semiconductor-metal heterostructures are interesting catalysts for solar-to-chemical energy conversion, but current compositions are impractical due to the relative toxicity ...