Most Cited Researchers in ChemE as per Elsevier Scopus (2016) Kavli Emerging Leader in Chemistry and Lectureship, ACS (2017)
Richard and Margaret Romano Professorial Scholar (2018-)Īmerican Vacuum Society Prairie Chapter Early Career Award (2017)Ĭampus Distinguished Promotion Award, UIUC (2017)Ĭenter for Advanced Studies Beckman Fellow (2017) Highly Cited Researcher, Clarivate Analytics (2018) Presidential Early Career Award in Science and Engineering (2019)ĭiscovery Fund Award, Department of Chemistry (2018)įellow of the Royal Society of Chemistry (2018) Science News Magazine Ten Scientists to Watch, SN10 (2020)Ĭampus Distinguished Promotion Award (2020) Kavli Frontiers of Science Fellow, National Academy of Sciences (2021)Ģ021 Blavatnik National Award for Young Scientists Finalist and Medalist (2020&21)Įlected Fellow of the American Association for the Advancement of Science (2020) Leo Hendrik Baekeland Medal, American Chemical Society, New Jersey Section (2021) Prospective postdocs, students, and collaborators interested in the above research projects are welcome to contact us. Imaging Phase Transitions in Single Nanocrystals. Phase transitions in solid-state materials often involve interesting dynamics. Since macroscopic solids are typically polycrystalline, such dynamics is smeared out in studies on bulk solids, due to ensemble averaging over different crystalline domains. By acquiring snapshots of a single nanocrystalline domain undergoing a phase transition, our lab is attempting to uncover the dynamic trajectory involved in the nucleation of a new phase. We are developing new optical and spectroscopic methods to acquire snapshots of model phase transitions and also using these techniques to learn new facts about fundamental phenomena such as crystal growth, impurity doping, and correlated electron systems. By employing strong optical resonances of metal nanostructures to 'squeeze' electromagnetic fields down to the nanoscale (10 Å), our lab seeks to bridge the gap between light and molecular excitations and uncover novel photochemistry and photophysical behavior in quantum dots, metalloproteins, chiral molecules, photovoltaic, and photosynthetic systems. This disparity in length scales between a molecule and the electromagnetic field limits light-matter interactions to common dipole-type processes. 1 Å), whereas the characteristic length scale of the electromagnetic field can be defined for a plane wave by its wavelength (ca. The characteristic length scale of such excitations is typically on the molecular size scale (ca. Light-Matter Interactions in the Near Field. The interaction of light with matter is primarily entailed by the excitation of electronic and vibrational modes by the electromagnetic field of light.
Our lab is using single-molecule super-resolution imaging techniques borrowed from the the biophysics community, and high-resolution electron microscopy, to resolve individual active sites on a catalyst surface. By mapping the distribution, structural composition, and heterogeneity of active sites, we seek to enhance understanding of catalytic materials and processes. Particular focus is on catalysts for water-splitting and CO2 to methanol conversion. In most cases, the identity of the active site is still in question. This is primarily because of the involvement of surfaces that are often chemically complex and heterogeneous. Super-Resolution Imaging of Heterogeneous Catalysts. Catalytic processes, despite their importance in the chemical industry as well as in solar-to-fuel conversion, remain poorly understood. The systems we investigate range from artificial photosynthetic systems to nanophotonic switches. The tools we use include single-molecule spectroscopy, nanofabrication, high-resolution electron microscopy, and plasmonics. We are a diverse team with interest and expertise in spectroscopy, materials science, and condensed matter physics.
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In summary, we are learning how to control and harness light as a source of energy and as a means to control the attributes and function of advanced materials. Iii) We design materials and coax them into exhibiting non-natural optical or optoelectronic phenomena. Ii) We image with unprecedented resolution chemical reactions on surfaces or in nanoparticles and uncover their mechanistic pathways. I) We employ the rich interplay between visible light and metal catalysts for selective formation of energy-dense chemical bonds.
There are three aspects of the light-matter interface that we study using spectroscopy, microscopy, and theory: Light-matter interactions are central in nature, life, and in technology.
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