The proposed work will experimentally elucidate equilibrium- and transient- physicochemical effects that underlie properties of nanoparticles in scenarios of elevated temperature function as well as in elevated temperature processing. The activities to be performed will advance fundamental understanding of both nanoparticle- and related surface chemistry under these conditions, which will enable development of strategies that can cause individual nanoparticles to maintain desired function at elevated temperature (preventing loss of ligands, change of crystal phase or evolution of chemical composition) or on the other hand, facilitate clean incorporation into a melt/sinter zone for additive manufacturing. In addition to using some standard techniques of e.g. x-ray scattering, Raman, and thermogravimetric analysis, the effort will implement state-of-the-art transient physical and spectroscopic methods including high fidelity, synchrotron-based transient x-ray diffraction, femtosecond stimulated Raman spectroscopy, and mid-infrared transient absorption to provide unprecedented insights as to the particle phase behavior and local chemistry in these important, yet poorly explored conditions. Systems targeted will focus on shape controlled II-VI semiconductors and earth abundant semiconductors silicon and Cu2ZnSnS4. The work is transformative in that design principles to control physicochemical particle stability will be developed and experimentally vetted herein. Advances will rationalize synthetic targets ranging from stable light-emitting diode components and biolabels to facilitation of additive manufacturing.
|Effective start/end date||9/1/18 → 8/31/21|
- National Science Foundation (CHE-1808590)