The symposia of the 2023 MRS Fall Meeting & Exhibit are divided into 8 clusters. Here are a few selected highlights.
Symposium EL04: Materials and Devices for Neuromorphic Electronics and Bio-interfaces
Principal Author Sheng Xu
Existing wearables can only sense signals on the skin surface or tissues very close to the skin surface. Wearable ultrasound technologies to be presented here can sense deep tissues, opening up a new sensing dimension to the wearables research community. Additionally, deep tissue signals have a stronger and faster correlation to disease status and progression than surface signals.
Symposium EL15: Chiral Materials—New Structures and Properties
Principal Author Zhifeng Huang
Circularly polarized light emission (CPLE) can be potentially applied to three-dimensional displays, information storage, and biometry. However, these applications are limited, in practical terms, by a low purity of circular polarization, i.e., the small optical dissymmetry factor g (with the maximum value of 2). The authors have devised a nano-fabrication platform, based on glancing angle deposition, to generate inorganic nanohelices for emitting CPLE with engineerable color and large g factor in a range of 10^(-2) to 10^(-1), shedding light on the commercialization of CPLE devices. This work was published in ACS Nano 2023, 17, 20611-20620.
Principal Author Andrea Alu
This talk will present polaritonic metasurfaces with broken symmetry. For instance, 2D magnetic CrSBr polaritons leading to light-matter hybrids for manipulation of quantum material properties (recently appeared in Nature 620, pages533–537 (2023)). Shear phonon polaritons can yield axial dispersion in frequency associated with the chirality of their phonon resonances (Nature Nanotechnology volume 18, pages64–70 (2023)).
Principal Author Hanyu Zhu
This research is the first quantitative experiment to show that chiral phonons, the rotation of atoms, can control magnetism. It establishes a new paradigm for studying magnetic materials and paves the way for potentially energy-efficient spintronics. The work will appear in the journal Science in November.
Symposium Symposium EN10: From Single Atom to Device—Interfaces Under Electrochemical Conditions
Principal Author Gang Wu
The author will report direct solution-phase synthesis of core/shell structured nanocrystals with tunable single-atom alloy (SAAs) layers, which contain isolated metal atoms in a host metal. The resultant densely packed Cu/CuAu single-atom alloy nanocrystals demonstrate a high selectivity toward NH3 from the electrocatalytic nitrate reduction reaction with an 85.5% Faradaic efficiency while maintaining a high yield rate of 8.47 mol h−1 g−1. This work advances the design of atomically precise catalytic sites by creating core/shell NCs with SAA atomic layers, opening an avenue for broad catalytic applications.
Principal Author William C. Chueh
Most non-metallic electrocatalysts and battery electrodes (e.g. lithium intercalation in battery, oxygen evolution reaction for water splitting) change composition during operation. But knowing the composition at or near the active site is very challenging. In this talk, the author will present the development of operando nanoscale microscopy (specifically, X-ray and scanning probe) and spectroscopy to track the dynamic evolution of electrocatalysts and battery electrodes during operation, and how the composition of the active site modifies reaction kinetics. The methodology is generally applicable to many important electrochemical interfaces under operational conditions.