Conveners
(DCMMP) M3-8 Materials Physics | Physique des matériaux (DPMCM)
- Kristin Poduska
Nanothermometry is a powerful tool that allows for controlling temperature at the nanoscale, and thus finds applications in research fields ranging from biomedicine to high-power microelectronics. Typical nanothermometry techniques employ secondary nanothermometers, where each individual nanosensor must be individually calibrated—ideally, both off- and in-situ. Here we utilize fluorescent...
The high-entropy oxide (HEO) Mg$_{0.2}$Co$_{0.2}$Ni$_{0.2}$Cu$_{0.2}$Zn$_{0.2}$O is synthesized by annealing equimolar mixtures of the parent binary oxides MgO, CoO, CuO, NiO, and ZnO to 1000 K and quenching to 295 K. X-ray diffraction shows HEO crystallizes in a single-phase rocksalt structure. The cations randomly occupy the $(000)$ site, while the oxygen sublattice is ordered. Lattice...
Understanding and controlling the liquid to crystal transformation is a central topic for numerous natural phenomena and technological applications. The first step of crystallization is the birth of critical nuclei. Their size, structure and rate at which critical nuclei appear and grow are fundamental parameters for understanding and controlling crystallization. Although nucleation rates can...
Understanding the kinetics and thermodynamics of the crystallization processes involved in carbon-rich materials is a critical knowledge gap that hinders a realistic assessment of the risks and benefits of potential climate-change-mitigation strategies [1]. Toward this end, we investigated the thermal and aqueous stabilities of single-phase and multi-phase mixtures of calcium carbonate and...
The p-doping of organic semiconductors (OSCs) for tuning their electronic structure in opto-electronic applications is typically done by adding strong molecular acceptors as dopants to initiate charge transfer. I will summarize the current understanding of the phenomena observed upon molecularly p-doping conjugated polymers (CPs) and molecules (COMs), where two different competing scenarios...
We discuss a systematic error in time-resolved optical conductivity measurements that becomes important at high pump intensities. We show that common optical nonlinearities can distort the photoconductivity depth profile, and by extension distort the photoconductivity spectrum. We show evidence that this distortion is present in existing measurements on $\text{K}_{3}\text{C}_{60}$, and...
