Browsing School of Physics by Author "Duesberg, Georg"
Now showing items 1-9 of 9
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Dependence of Photocurrent Enhancements in Hybrid Quantum Dot-MoS2 Devices on Quantum Dot Emission Wavelength
Bradley, Louise; Mc Evoy, Niall; Mc Closkey, David; Duesberg, Georg (2019)The spectral dependence of nonradiative energy transfer (NRET) from three spectrally different quantum dot (QD) ensembles to monolayer MoS2 is reported. The QDs with peak emission wavelengths of 450, 530, and 630 nm induce ... -
Dependence of Photocurrent Enhancements in Quantum Dot (QD)-Sensitized MoS2 Devices on MoS2 Film Properties
Mc Evoy, Niall; Coleman, Jonathan; Mc Closkey, David; Bradley, Louise; Duesberg, Georg (2018)This report demonstrates highly efficient nonradiative energy transfer (NRET) from alloyed CdSeS/ZnS semiconductor nanocrystal quantum dots (QDs) to MoS2 films of varying layer thicknesses, including pristine monolayers, ... -
Edge and confinement effects allow in situ measurement of size and thickness of liquid-exfoliated nanosheets
Mc Closkey, David; Nicolosi, Valeria; Duesberg, Georg; Donegan, John; Mc Evoy, Niall; Coleman, Jonathan (2014)Two-dimensional nanomaterials such as MoS2 are of great interest both because of their novel physical properties and their applications potential. Liquid exfoliation, an important production method, is limited by our ... -
Electronic and structural characterisation of polycrystalline platinum disulfide thin films
Zhussupbekova, Ainur; Duesberg, Georg; Shvets, Igor (2020)We employ a combination of scanning tunnelling microscopy (STM) and scanning tunnelling spectroscopy (STS) to investigate the properties of layered PtS2, synthesised via thermally assisted conversion (TAC) of a metallic ... -
Enhancing the electrical properties of MoS2 through nonradiative energy transfer
Mc Evoy, Niall; Duesberg, Georg; Bradley, Louise (2017)In this study highly efficient nonradiative energy transfer from semiconductor quantum dots to monolayer MoS 2 with an efficiency of ~99% is demonstrated. Although the energy transfer efficiency is close to unity, there ... -
Imaging and identification of point defects in PtTe2
Zhussupbekova, Ainur; Duesberg, Georg; Shvets, Igor (2021)The properties and performance of two-dimensional (2D) materials can be greatly affected by point defects. PtTe2, a 2D material that belongs to the group 10 transition metal dichalcogenides, is a type-II Dirac semimetal, ... -
Nonradiative Energy Transfer and Photocurrent Enhancements in Hybrid Quantum Dot-MoS<inf>2</inf> Devices
Duesberg, Georg; Coleman, Jonathan; Bradley, Louise; Mc Evoy, Niall; Mc Closkey, David (2018)The energy transfer mechanism leading to highly efficient nonradiative energy transfer (NRET) from quantum dots (QDs) to monolayer MoS 2 devices has been investigated via a spectral dependence study. The spectral dependence ... -
Preparation of gallium sulfide nanosheets by liquid exfoliation and their application as hydrogen evolution catalysts
Duesberg, Georg; Coleman, Jonathan; Donegan, John; Nicolosi, Valeria; Mc Evoy, Niall; Mc Closkey, David (2015)Here we demonstrate the production of large quantities of gallium sulfide (GaS) nanosheets by liquid exfoliation of layered GaS powder. The exfoliation was achieved by sonication of the powder in suitable solvents. The ... -
Suppression of the metal-insulator transition in magnetron sputtered Ti2O3 films
Caffrey, David; Duesberg, Georg; Shvets, Igor (2020)We report on the synthesis of titanium suboxide films using a magnetron sputtering setup. The structure of the produced films is characterized using Raman spectroscopy and X-ray diffraction and electrical properties are ...