Plasmonics in Nanocomposite Materials: From Theory to Application Session I
Sponsored by: TMS Structural Materials Division, TMS: Composite Materials Committee
Program Organizers: Nasrin Hooshmand, Georgia Institute of Technology; Simona Hunyadi Murph, Savannah River National Laboratory; Mahmoud Abdelwahed, The University of Texas at San Antonio
Monday 8:30 AM
March 15, 2021
Room: RM 45
Location: TMS2021 Virtual
Session Chair: Nasrin Hooshmand, Georgia Institute of Technology
8:30 AM Keynote
Gold and Au/Ni and Other Plasmonic Nanoparticles: Using Theory to Understand Metal Recovery and Optical Properties: George Schatz1; 1Northwestern University
This talk will describe theory that can be used to understand metal particles going from mining to optical devices. We begin by describing a recent collaboration with Fraser Stoddart’s group concerned with making supramolecular structures for gold recovery based on binding of gold ions with cucurbit[6]uril anions. Several Au3+ salts bind to these anions in solution, leading to precipitates that enable 99.2% gold recovery. Theory can be used to rationalize the solubility properties of the precipitates, and depends on the anion associated with Au3+.We then move to bimetallic nanoparticles, in particular gold/nickel bimetallics that are made using scanning probe block copolymer lithography (SPBCL) (in studies by the Chad Mirkin group) and other techniques that lead to Janus-like structures. Finally we describe studies of arrays of gold nanoparticles, and plasmonic lattice resonances associated with these arrays that enable powerful control of optical properties in many different ways.
9:15 AM Invited
Anisotropic and Shape-selective Plasmonic Nanomaterials: Structure-property Relationships: Simona Hunyadi Murph1; 1Savannah River National Laboratory
As material size decreases into the nano size regime, novel properties arise that are different from their molecular and bulk counterparts. Isotropic nanomaterials have properties and functionalities that do not depend on spatial orientation, while anisotropic nanomaterials have properties and functionalities that are determined by their orientation within the x, y, and z dimensions. This presentation addresses the effect of dimensionality on the optical, electronic, chemical, and physical assets of various nanomaterials and how physical and chemical relationships can be exploited to improve their applications. I will highlight recent innovations from our laboratory by featuring uniquely shaped plasmonic noble metal (Au, Ag) and/or metal oxide (Fe2O3, SiO2, TiO2) nanostructures and how their morphology and dimension affect their physico-chemical properties. Applications pertinent to sensing, sequestration, and photo-/magneto- thermal applications will be described.
9:45 AM Invited
Nanophotonics for Neural Engineering
: David Garfield1; Emory Chan1; Peter Schuck1; Michel Maharbiz1; Maysam Chamanzar2; 1The Molecular Foundry, Lawrence Berkeley National Laboratory; 2Carnegie Mellon University
With the advent of optical methods such as optogenetics and calcium imaging to stimulate and record neural activity in the central and peripheral nervous system, the importance of nanophotonics to deliver localized light within the tissue is becoming more and more apparent. In this paper, we discuss some of our recent research activities on developing nanophotonic devices— tetherless implantable microstructures embedded with upconverting nanoparticles—to convert externally focused infrared light to localized visible light within the tissue of the target site, in order to achieve optical manipulation and imaging of neural circuits.
10:05 AM Invited
Understanding Photocarrier and Gas Dynamics to Rationally Design Nano-heterostructured Photocatalysts for CO2 Conversion: Anthony Thompson1; 1Savannah River National Laboratory
Recent research in CO2 photoconversion has been heavily focused on catalyst development, including significant efforts to extend photon absorption to the visible range of the solar spectrum. However, there remains a knowledge gap in understanding the dynamics of photocarriers (generation, trapping, diffusion, recombination) and how they relate to adsorption and the dynamics of adsorbed gases and intermediates on the surface of nanostructured catalysts. Here we elucidate these processes using a series of in situ techniques to study CO2 photoconversion on a series of heterostructured nanocatalysts. Unique in situ techniques such as molecular beam scattering, transient absorption spectroscopy, temperature-programmed desorption, electron paramagnetic resonance, and diffuse reflectance IR and UV-Vis spectroscopy are coupled with pulsed and continuous laser techniques to gain mechanistic insight to the catalytic cycle for CO2 photoconversion. Knowledge obtained from these studies will be used to rationally design the next generation of photocatalysts for solar CO2 conversion.