Articles by Beata M. Szydlowska in JoVE
Preparación de exfoliadas-Liquid Metal transición Dichalcogenide nanoláminas con Controlled tamaño y grosor: Un Estado del Protocolo de Arte Claudia Backes1, Damien Hanlon2, Beata M. Szydlowska2, Andrew Harvey2, Ronan J. Smith2, Thomas M. Higgins1, Jonathan N. Coleman2 1Chair of Applied Physical Chemistry, Ruprecht-Karls University Heidelberg, 2School of Physics and CRANN, Trinity College Dublin Un protocolo para la exfoliación líquida de materiales estratificados a nanoláminas, se presenta su selección de tamaño y la medida del tamaño mediante técnicas microscópicas y espectroscópicas.
Other articles by Beata M. Szydlowska on PubMed
Production of Highly Monolayer Enriched Dispersions of Liquid-Exfoliated Nanosheets by Liquid Cascade Centrifugation ACS Nano. Jan, 2016 | Pubmed ID: 26728793 While liquid exfoliation is a powerful technique to produce defect-free nanosheets in large quantities, its usefulness is limited by broad nanosheet thickness distributions and low monolayer contents. Here we demonstrate liquid processing techniques, based on iterative centrifugation cascades, which can be designed to achieve either highly efficient nanosheet size-selection and/or monolayer enrichment. The resultant size-selected dispersions were used to establish quantitative metrics to determine monolayer volume fraction, as well as mean nanosheet size and thickness, from standard spectroscopic measurements. Such metrics allowed us to design and optimize centrifugation cascades to enrich liquid exfoliated WS2 dispersions up to monolayer contents of 75%. Monolayer-rich dispersions show relatively bright photoluminescence with narrow line widths (
Ultrafast Nonlinear Excitation Dynamics of Black Phosphorus Nanosheets from Visible to Mid-Infrared ACS Nano. Jul, 2016 | Pubmed ID: 27281449 The recent progress on black phosphorus makes it a promising candidate material for broadband nanophotonic devices, especially operating in the mid-infrared spectral region. Here, the excited carrier dynamics and nonlinear optical response of unoxidized black phosphorus nanosheets and their wavelength dependence were systematically studied from 800 nm to 2.1 μm. The wavelength-dependent relaxation times of black phosphorus nanosheets are determined to be 360 fs to 1.36 ps with photon energies from 1.55 to 0.61 eV. In a comparative study with graphene, we found that black phosphorus has a faster carrier relaxation in near- and mid-infrared region. With regard to nonlinear optical absorption, the response of black phosphorus significantly increases from near- to mid-infrared, and black phosphorus is also confirmed to be better as saturable absorber to MoS2 in infrared region.