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Department of Chemistry

 

What we do...

Our experimental work focuses on light-based sensing technologies which have applications in healthcare diagnostics, environmental monitoring and homeland security. We also use light-based techniques to analyse painted art-works without damaging them. In our computational work, we employ advanced computer-modelling techniques to 'design' and understand the physical behaviour of functional materials, such as new computer-memory materials.

We are funded by...

We are grateful to NIHR (i4i) and EPSRC for funding these projects.

Our research

Our research is mainly concerned with different aspects of (bio)chemical sensing (e.g. using MEMS or optical devices), and with non-crystalline materials (e.g. glasses), understanding their physical properties in terms of their atomic structure and defects. The approach is multidisciplinary, covering solid-state chemistry, physics and materials science. Areas of interest include:

  • Microcantilever sensors for ultra-sensitive detection of chemical and biological analytes.
  • Optical sensors, including evanescent-waveguide sensors, SERS using holographic substrates.
  • Computer simulation of the atomic structure and vibrational dynamics of disordered materials.
  • Ab-initio computer simulation of phase transformations and optically-induced metastabilities in glasses, e.g. used in phase-change memories (Flash replacement).
  • Experimental study of optically-induced changes in glasses, with applications in the fields of optical- waveguides and chemical sensors, data storage and all-optical actuation.

Figure: Ab initio molecular-dynamics model of the amorphous state of the phase-change non- volatile memory material Ge2Sb2Te5

Selected Publications

 

  • Computer-simulation design of new phase-change memory materials. Phys. Status Solidi A 207, 510 (2010)
  • Spatial distribution of rare-earth ions and GaS4 tetrahedra in chalcogenide glasses studied via laser spectroscopy and ab initio molecular dynamics simulation. Phys. Rev. B 81, 104204 (2010)
  • Simultaneous readout of multiple microcantilever arrays with phase-shifting interferometric microscopy (PSIM) Rev. Sci. Instr. (2009), 80, 093101-8
  • Evidence of formation of tightly bound rare-earth clusters in chalcogenide glasses and their evolution with glass compositions. Phys Rev B, (2009), 79, 180202(1-4)
  • Evanescent-Wave Excitation of Surface-Enhanced Raman Scattering Substrates by an Optical-Fiber Taper. Optics Letters (2009) 34, 2685-2687
  • Microscopic origin of the fast crystallization ability of Ge-Sb-Te phase-change memory materials, Nat. Mat., (2008), 7, 399
  • All-optical actuation of amorphous chalcogenide-coated cantilevers, J. Non-Cryst. Sol., (2007), 353, 250.
  • Universal features of terahertz absorption in disordered materials, Phys. Rev. Lett., (2006), 97, 055504
  • Universal features of localized eigenstates in disordered systems, J. Phys. Cond. Matt, (2005), 17, L321

Publications

Disorder by design: A data-driven approach to amorphous semiconductors without total-energy functionals
DK Limbu, SR Elliott, R Atta-Fynn, P Biswas
– Scientific Reports
(2020)
10,
7742
Vacancy formation energy and its connection with bonding environment in solid: A high-throughput calculation and machine learning study
YX Cheng, L Zhu, G Wang, J Zhou, SR Elliott, Z Sun
– Computational Materials Science
(2020)
183,
109803
Revisiting the Makishima-Mackenzie Model for Predicting the Young's Modulus of Oxide Glasses
Y Shi, A Tandia, B Deng, SR Elliott, M Bauchy
– Acta Materialia
(2020)
195,
252
Quench-rate and size-dependent behaviour in glassy Ge2Sb2Te5 models simulated with a machine-learned Gaussian approximation potential
FC Mocanu, K Konstantinou, SR Elliott
– Journal of Physics D
(2020)
53,
244002
Synergy effect of co-doping Sc and Y in Sb2Te3 for phase-change memory
S Hu, J Xiao, J Zhou, SR Elliott, Z Sun
– Journal of Materials Chemistry C
(2020)
8,
6672
Electronic mechanism for resistance drift in phase-change memory materials: Link to persistent photoconductivity
SR Elliott
– Journal of Physics D: Applied Physics
(2020)
53,
214002
Temperature-induced structural change through the glass transition of silicate glass by neutron diffraction
Y Shi, O Gulbiten, J Neuefeind, D Ma, AP Song, B Wheaton, M Bauchy, SR Elliott
– Physical Review B
(2020)
101,
134106
Elucidation of the Nature of Structural Relaxation in Glassy D-Sorbitol
M Krynski, F Mocanu, S Elliott
– Journal of Physical Chemistry B
(2020)
124,
1833
Non-equilibrium ab initio molecular-dynamics simulations of lattice thermal conductivity in glassy Ge2Sb2Te5
FC Mocanu, K Konstantinou, SR Elliott
– Applied Physics Letters
(2020)
116,
031902
Temperature-induced nanostructural evolution of hydrogen-rich voids in amorphous silicon: A first-principles study
P Biswas, D Paudel, R Atta-Fynn, S Elliott
– Nanoscale
(2020)
1185
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Research Groups

Research Interest Groups

Telephone number

01223 336525

Email address

sre1@cam.ac.uk