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Group Member

Introduction

I graduated from Dublin City University with a BSc in Applied Physics in 2009. I joined Prof Zhang's research group, the Photonics and Nanofabrication Group, at Trinity College Dublin in 2009 and received my PhD in 2013. I am currently working as a Postdoctoral Research Fellow in the AMBER research centre in Trinity College.

Research

Fabrication

My research is focused on direct, top-down, fabrication of novel nanostructures and modifying the properties of 2-dimensional materials at the atomic scale. Much of my early work was done on Graphene. My focus is now on molybdenum disulphide (MoS₂), as well as other similar layered materials such as the other transmission metal dichalcogenides. To achieve this I use a range of focused electron and ion beams. The Helium Ion Microscope (HIM) is a recent development which is ideally suited to this type of fabrication due to its ~0.35nm beam size and has been the subject of much of my research.

Characterisation

To understand the effects of the irradiation of 2-dimensional materials with charged particles a wide variety of techniques are employed. For example Raman spectroscopy and Transmission Electron Microscopy (TEM) are used for structural analysis and Energy Dispersive X-ray spectroscopy (EDX) and Electron Energy-Loss Spectroscopy (EELS) are used to determine elemental composition.

Publications

• Title:
  • Sub 5 nm Graphene Nanopore Fabrication by Nitrogen Ion Etching Induced by a Low-Energy Electron Beam.
• Authors:
  • Daniel S Fox, Pierce Maguire, Yangbo Zhou, Cornelia Rodenburg, Arlene O’Neill, Jonathan N Coleman & Hongzhou Zhang.
• Source:
  • Nanotechnology [accepted] (2016)

• Title:
  • Quantitative secondary electron imaging for work function extraction at atomic level and layer identification of graphene.
• Authors:
  • Yangbo Zhou, Daniel S Fox, Pierce Maguire, Robert O'Connell, Robert Masters, Cornelia Rodenburg, Hanchun Wu, Maurizio Dapor, Ying Chen & Hongzhou Zhang.
• Source:
  • Scientific Reports (2016)

• Title:
  • Effects of Blending Sequence on Morphology and Mechanical Properties of Polypropylene/Ethylene-octene Copolymer/Clay Nanocomposites.
• Authors:
  • Sedigheh Bagheri-Kazemabad, Alireza Khavandi, Daniel Fox, Yanhui Chen, Hongzhou Zhang & Biqioung Chen.
• Source:
  • Manufacturing Science and Technology (2015)

• Title: Effect of the Compatibilizer on Clay Dispersion in Polypropylene/Clay Nanocomposites.
• Authors:
  • Sedigheh Bagheri-Kazemabad, Alireza Khavandi, Daniel Fox, Yanhui Chen, Hongzhou Zhang & Biqioung Chen.
• Source:
  • Advanced Materials Research (2012)

• Title:
  • Nanopatterning and Electrical Tuning of MoS₂ Layers with a Subnanometre Helium Ion Beam.
• Authors:
  • Daniel S Fox, Yangbo Zhou, Pierce Maguire, Arlene O’Neill, Cormac Ó Coileáin, Riley Gatensby, Alexey M Glushenkov, Tao Tao, Georg S Duesberg, Igor V Shvets, Mohamed Abid, Mourad Abid, Han-Chun Wu, Ying Chen, Jonathan N Coleman, John F Donegan & Hongzhou Zhang.
• Source:
  • Nano Letters (2015)

• Title:
  • Tunable nonlinear refractive index of two-dimensional MoS2, WS2, and MoSe2 nanosheet dispersions [Invited].
• Authors:
  • Gaozhong Wang, Saifeng Zhang, Xiaoyan Zhang, Long Zhang, Ya Cheng, Daniel Fox, Hongzhou Zhang, Jonathan N. Coleman, Werner J. Blau & Jun Wang.
• Source:
  • Photonics Research (2015)

• Title:
  • Helium Ion Microscopy for Graphene Characterization and Modification, Book Chapter in Nanotubes and Nanosheets: Functionalization and Applications of Boron Nitride and Other Nanomaterials.
• Authors:
  • Daniel Fox, Yangbo Zhou & Hongzhou Zhang. Editor: Ying (Ian) Chen.
• Source:
  • Nanotubes and Nanosheets (2015)

• Title:
  • Morphology and properties of polypropylene/ethylene–octene copolymer/clay nanocomposites with double compatibilizers.
• Authors:
  • Sedigheh Bagheri-Kazemabad, Daniel Fox, Yanhui Chen, Hongzhou Zhang & Biqiong Chen.
• Source:
  • Polymers for Advanced Technologies (2014)

• Title:
  • Helium ion microscope generated nitrogen-vacancy centres in type Ib diamond.
• Authors:
  • David McCloskey, Daniel Fox, Neal O'Hara, Victor Usov, Declan Scanlan, Niall McEvoy, Georg S Duesberg, Graham LW Cross, Hongzhou Zhang & John F Donegan.
• Source:
  • Applied Physics Letters (2014)

• Title:
  • Ultrafast Saturable Absorption of Two-Dimensional MoS₂ Nanosheets.
• Authors:
  • Kangpeng Wang, Jun Wang, Jintai Fan, Mustafa Lotya, Arlene O’Neill, Daniel Fox, Yanyan Feng, Xiaoyan Zhang, Benxue Jiang, Quanzhong Zhao, Hongzhou Zhang, Jonathan N Coleman, Long Zhang, & Werner Josef Blau.
• Source:
  • ACS Nano (2013)

• Title:
  • Helium ion microscopy of graphene: beam damage, image quality and edge contrast.
• Authors:
  • Daniel Fox, Yangbo Zhou, Arlene O'Neill, Shishir Kumar, Jing Jing Wang, Jonathan Coleman, Georg Duesberg, John Donegan & Hongzhou Zhang.
• Source:
  • Nanotechnology (2013)

• Title:
  • General approach to the analysis of plasmonic structures using spectroscopic ellipsometry.
• Authors:
  • Ruggero Verre, M Modreanu, Oral Ualibek, Damiel Fox, Karsten Fleischer, Christopher Smith, Hongzjou Zhang, Martin Pemble, John F McGilp, & Igor V Shvets.
• Source:
  • Physical Review B (2013)

• Title:
  • Enhanced photoluminescence from SiO_x-Au nanostructures.
• Authors:
  • Hu Luo, Rongming Wang, Yanhui Chen, Daniel Fox, Robert O'Connell, Jing Jing Wang & Hongzhou Zhang.
• Source:
  • CrystEngComm (2013)

• Title:
  • Microstructural and chemical variation of TiO₂ electrodes in DSSCs after ethanol vapour treatment.
• Authors:
  • Yanhui Chen, Hongzhou Zhang, Daniel Fox, Colm C Faulkner, David Jeng & Mazhar Bari.
• Source:
  • Materials Science and Engineering: B (2013)

• Title:
  • Equilibrium faceting formation in vicinal Al₂O₃ (0001) surface  caused by annealing.
• Authors:
  • Ruggero Verre, Sumesh RG Sofin, Victor Usov, Karsten Fleischer, Daniel Fox, Gavin Behan, Hongzhou Zhang & Igor V Shvets.
• Source:
  • Surface Science (2012)

• Title:
  • "Morphology, rheology and mechanical properties of polypropylene/ethylene–octene copolymer/clay nanocomposites: Effects of the compatibilizer.
• Authors:
  • Sedigheh Bagheri-Kazemabad, Daniel Fox, Yanhui Chen, Luke M Geever, Alireza Khavandi, Reza Bagheri, Clement L Higginbotham, Hongzhou Zhang & Biqiong Chen.
• Source:
  • Composites Science and Technology (2012)

• Title:
  • Nano-structuring, surface and bulk modification with a focused helium ion beam.
• Authors:
  • Daniel Fox, Yanhui Chen, Colm C. Faulkner & Hongzhou Zhang.
• Source:
  • Beilstein Journal of Nanotechnology (2012)

• Title:
  • Investigation of coupled cobalt-silver nanoparticle system by plan view TEM.
• Authors:
  • Daniel Fox, Ruggero Verre, Brendan J O'Dowd, Sunil K Arora, Colm C Faulkner, Igor V Shvets & Hongzhou Zhang.
• Source:
  • Progress in Natural Science: Materials International (2012)

• Title:
  • Controlled in situ growth of tunable plasmonic self-assembled nanoparticle arrays.
• Authors:
  • Ruggero Verre, Karsten Fleischer, John F McGilp, Daniel Fox, Gavin Behan, Hongzhou Zhang & Igor V Shvets.
• Source:
  • Nanotechnology (2012)

• Title:
  • The use of quartz crystal microbalance with dissipation (QCM-D) for studying nanoparticle-induced platelet aggregation.
• Authors:
  • Maria Jose Santos-Martinez, Iwona Inkielewicz-Stepniak, Carlos Medina, Kamil Rahme, Deirdre M D'Arcy, Daniel Fox, Justin D Holmes, Hongzhou Zhang, Marek Witold Radomski.
• Source:
  • International Journal of Nanomedicine (2012)

• Title:
  • Nitrogen assisted etching of graphene layers in a scanning electron microscope.
• Authors:
  • Daniel Fox, Arlene O’Neill, Dan Zhou, Markus Boese, Jonathan N Coleman & Hongzhou Zhang.
• Source:
  • Applied Physics Letters (2011)