Events
O martes 24 de setembro de 2024 o Dr. Paul Mulvaney (ARC Centre of Excellence in Exciton Science, School of Chemistry, University of Melbourne) ofrecerá o seminario “Spectroscopy of Gold Nanocrystals and Quantum Dots".
Será ás 11:00h na Sala de Seminarios da Torre CACTI.
Abstract:
Nanocrystals have remarkable size dependent optical properties. But to exploit these materials we also need to consider the role of chemistry, especially surface chemistry. In this talk I will discuss two cases where nanocrystal surface chemistry is critical for understanding optical experiments.
- Nanoscale assembly – can we ever create arbitrary structures from colloids through chemical or directed assembly? [1], [2].
- Why aren’t quantum dots (QDs) in all of our electronic devices? We use spectroelectrochemistry and single QD spectroscopy to explore the way charge carriers interact with semiconductor nanocrystals (QDs).[3]
Figure 1. (Left): Quantum dots (QDs) have been studied for 30 years but devices based on single QDs remain elusive. Why? (Right):Gold nanorods exhibit unusual size and shape dependent properties. How can we assemble them into useful structures?
References
[1] Growth of Gold Nanorods: A SAXS Study; S Seibt, H Zhang, S Mudie, S Förster, P Mulvaney
The Journal of Physical Chemistry C 125, 19947-19960 (2021).
[2] A General Method for Directed Assembly of Single Nanocrystals, H Zhang, Y Liu, A Ashokan, C Gao, Y Dong, C Kinnear, N Kirkwood et al. Advanced Optical Materials, 2200179 (2022).
[3] Two mechanisms determine quantum dot blinking, G Yuan, DE Gómez, N Kirkwood, K Boldt, P Mulvaney, ACS Nano 12, 3397-3405 (2018).
