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In situ formation of onion-like carbon from the evaporation of ultra-dispersed nanodiamonds (2013)
Journal Article
Krishnamurthy, S., Butenko, Y. V., Dhanak, V., Hunt, M., & Siller, L. (2013). In situ formation of onion-like carbon from the evaporation of ultra-dispersed nanodiamonds. Carbon, 52, 145-149. https://doi.org/10.1016/j.carbon.2012.09.015

We report the in situ formation of onion-like carbon (OLC) by evaporation from a nanodiamond source under ultra-high vacuum conditions. The OLC is characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), Raman spectrosc... Read More about In situ formation of onion-like carbon from the evaporation of ultra-dispersed nanodiamonds.

Extraordinarily Long-Ranged Structural Relaxation in Defective Achiral Carbon Nanotubes (2012)
Journal Article
Hunt, M., & Clark, S. (2012). Extraordinarily Long-Ranged Structural Relaxation in Defective Achiral Carbon Nanotubes. Physical Review Letters, 109(26), Article 265502. https://doi.org/10.1103/physrevlett.109.265502

We present a systematic ab initio density functional theory–based study which demonstrates that even one of the simplest defects in single-wall carbon nanotubes, the reconstructed monovacancy (a pentagonal ring and a single dangling bond known as a 5... Read More about Extraordinarily Long-Ranged Structural Relaxation in Defective Achiral Carbon Nanotubes.

DNA-modified silicon nanocrystals studied by X-ray luminescence and X-ray absorption spectroscopies: Observation of a strong infra-red luminescence band (2012)
Journal Article
Coxon, P., Newman, M., Hunt, M., O'Farrell, N., Horrocks, B., Poolton, N., & Siller, L. (2012). DNA-modified silicon nanocrystals studied by X-ray luminescence and X-ray absorption spectroscopies: Observation of a strong infra-red luminescence band. Journal of Applied Physics, 111(5), Article 054311. https://doi.org/10.1063/1.3691600

Silicon nanocrystals (SiNCs) modified with 18-mer DNA oligonucleotides have been studied by X-ray excited optical luminescence (XEOL) and X-ray absorption spectroscopy (XAS) in photoluminescence yield (PLY) and total electron yield (TEY) modes. Lumin... Read More about DNA-modified silicon nanocrystals studied by X-ray luminescence and X-ray absorption spectroscopies: Observation of a strong infra-red luminescence band.

Surface Hubbard U of alkali fullerides (2011)
Journal Article
Macovez, R., Hunt, M., Goldoni, A., Pedio, M., & Rudolf, P. (2011). Surface Hubbard U of alkali fullerides. Journal of Electron Spectroscopy and Related Phenomena, 183(1-3), 94-100. https://doi.org/10.1016/j.elspec.2010.07.006

We report a combined photoemission spectroscopy (PES) and inverse photoemission spectroscopy (IPES) study of distilled, phase pure films of C60 and the monomeric fullerides Cs6C60, Cs4C60 and fcc RbC60. The separation between the highest energy PES a... Read More about Surface Hubbard U of alkali fullerides.

Gold Nitride: Preparation and Properties (2009)
Journal Article
Siller, L., Alves, L., Brieva, A., Butenko, Y., & Hunt, M. (2009). Gold Nitride: Preparation and Properties. Topics in Catalysis, 52(11), 1604-1610. https://doi.org/10.1007/s11244-009-9281-6

We review the currently known methods of producing gold nitride and report on the influence of electrically isolated substrates on the growth of gold nitride films by reactive ion sputtering (RIS). It is found that isolation of the substrate decrease... Read More about Gold Nitride: Preparation and Properties.

Core and valence exciton formation in x-ray absorption, x-ray emission and x-ray excited optical luminescence from passivated Si nanocrystals at the Si L-2,L-3 edge (2009)
Journal Article
Siller, L., Krishnamurthy, S., Kjeldgaard, L., Horrocks, B., Chao, Y., Houlton, A., …Hunt, M. (2009). Core and valence exciton formation in x-ray absorption, x-ray emission and x-ray excited optical luminescence from passivated Si nanocrystals at the Si L-2,L-3 edge. Journal of Physics: Condensed Matter, 21(9), Article 095005. https://doi.org/10.1088/0953-8984/21/9/095005

Resonant inelastic x-ray scattering (RIXS), x-ray absorption spectroscopy and x-ray excited optical luminescence (XEOL) have been used to measure element specific filled and empty electronic states over the Si L-2,L-3 edge of passivated Si nanocrysta... Read More about Core and valence exciton formation in x-ray absorption, x-ray emission and x-ray excited optical luminescence from passivated Si nanocrystals at the Si L-2,L-3 edge.

Metal-to-insulator transition in thin-film polymeric AC(60) (2009)
Journal Article
Macovez, R., Hunt, M., Shan, J., Goldoni, A., Pichler, T., Pedio, M., …Rudolf, P. (2009). Metal-to-insulator transition in thin-film polymeric AC(60). New Journal of Physics, 11(2), Article 023035. https://doi.org/10.1088/1367-2630/11/2/023035

We present an electron spectroscopy study of phase-pure AC(60) thin films (A = Rb, Cs) in their monomer (face-centred cubic (fcc)) and polymer phases. A surface electronic reconstruction is observed in polymeric RbC60, analogous to that reported for... Read More about Metal-to-insulator transition in thin-film polymeric AC(60).

Potassium intercalation of carbon onions 'opened' by carbon dioxide treatment (2008)
Journal Article
Butenko, Y. V., Chakraborty, A., Peltekis, N., Krishnamurthy, S., Dhanak, V., Hunt, M., & Siller, L. (2008). Potassium intercalation of carbon onions 'opened' by carbon dioxide treatment. Carbon, 46(8), 1133-1140. https://doi.org/10.1016/j.carbon.2008.04.012

The potassium intercalation of onion-like carbon (OLC) samples consisting of aggregates of carbon onions is studied with photoemission spectroscopy. OLC samples were initially prepared by annealing nanodiamonds (3-20 nm in diameter) at 1800 K in vacu... Read More about Potassium intercalation of carbon onions 'opened' by carbon dioxide treatment.

Surface and bulk components in angle-resolved core-level photoemission spectroscopy of graphite (2008)
Journal Article
Hunt, M. R. (2008). Surface and bulk components in angle-resolved core-level photoemission spectroscopy of graphite. Physical review B, 78(15), Article 153408. https://doi.org/10.1103/physrevb.78.153408

Angle-resolved x-ray photoelectron spectroscopy of the C 1s line of highly oriented pyrolytic graphite reveals two components separated by 194±6 meV, with markedly different asymmetry parameters and natural linewidth. Analysis of the intensity of the... Read More about Surface and bulk components in angle-resolved core-level photoemission spectroscopy of graphite.

A photoelectron spectroscopy study of ion-irradiation induced defects in single-wall carbon nanotubes (2007)
Journal Article
Chakraborty, A., Wooley, R., Butenko, Y. V., Siller, L., & Hunt, M. (2007). A photoelectron spectroscopy study of ion-irradiation induced defects in single-wall carbon nanotubes. Carbon, 45, 2744-2750. https://doi.org/10.1016/j.carbon.2007.09.036

Valence band and core level photoemission spectroscopies were used to study the changes brought about by irradiation of a singlewall carbon nanotube (SWCNT) film by 3 keV Ar+ ions at room temperature. At low ion doses (low defect density) an increase... Read More about A photoelectron spectroscopy study of ion-irradiation induced defects in single-wall carbon nanotubes.

Influence of star-like iridium complexes in the graphoepitaxy of polyfluorene thin films. (2006)
Journal Article
Knaapila, M., Torkkeli, M., Lyons, B., Hunt, M., Hase, T., Seeck, O., …Monkman, A. (2006). Influence of star-like iridium complexes in the graphoepitaxy of polyfluorene thin films. Physical review B, 74, 1-5. https://doi.org/10.1103/physrevb.74.214203

We report on the impact on the equatorial and meridional orientation in hairy-rod poly[9,9-bis(2-ethylhexyl)-fluorene-2,7-diyl] thin films when blended with tris-cyclometalated oligo-fluorenylpyridine iridium(III) complex. The presence of this transi... Read More about Influence of star-like iridium complexes in the graphoepitaxy of polyfluorene thin films..

Chemical vapor deposition growth of carbon nanotubes on Si substrates using Fe catalyst: What happens at the nanotube/Fe/Si interface. (2006)
Journal Article
Chakraborty, A. K., Jacobs, J., Anderson, C., Roberts, C., & Hunt, M. R. (2006). Chemical vapor deposition growth of carbon nanotubes on Si substrates using Fe catalyst: What happens at the nanotube/Fe/Si interface. Journal of Applied Physics, 100(8), 1-6. https://doi.org/10.1063/1.2360774

Direct growth of carbon nanotubes (CNTs) on silicon is of great importance for their potential exploitation in the semiconductor industry. In this article we investigate the chemical vapor deposition growth of CNTs on Si substrates from ethylene prec... Read More about Chemical vapor deposition growth of carbon nanotubes on Si substrates using Fe catalyst: What happens at the nanotube/Fe/Si interface..

Optical luminescence from alkyl-passivated Si nanocrystals under vacuum ultraviolet excitation: Origin and temperature dependence of the blue and orange emissions. (2006)
Journal Article
Chao, Y., Houlton, A., Horrocks, B., Hunt, M., Poolton, N., Yang, J., & Siller, L. (2006). Optical luminescence from alkyl-passivated Si nanocrystals under vacuum ultraviolet excitation: Origin and temperature dependence of the blue and orange emissions. Applied Physics Letters, 88(26), 1-3. https://doi.org/10.1063/1.2216911

The origin and stability of luminescence are critical issues for Si nanocrystals which are intended for use as biological probes. The optical luminescence of alkyl-monolayer-passivated silicon nanocrystals was studied under excitation with vacuum ult... Read More about Optical luminescence from alkyl-passivated Si nanocrystals under vacuum ultraviolet excitation: Origin and temperature dependence of the blue and orange emissions..

Rapid thermal oxidation of Ge-rich Si1-xGex heterolayers (2006)
Journal Article
Bera, M., Chakraborty, S., Das, R., Dalapati, G., Chattopadhyay, S., Samanta, S., …Maiti, C. (2006). Rapid thermal oxidation of Ge-rich Si1-xGex heterolayers. Journal of Vacuum Science and Technology A, 24(1), 84-90

Rapid thermal oxidation (RTO) of the Ge-rich (x=0.7)Si1-xGex heterolayer is reported. In particular, the structural modifications of SiGe films during oxidation process and the dependence of the oxidation kinetics on Ge content, oxidation temperature... Read More about Rapid thermal oxidation of Ge-rich Si1-xGex heterolayers.

Reactions and luminescence in passivated Si nanocrystallites induced by vacuum ultraviolet and soft-x-ray photons (2005)
Journal Article
Chao, Y., Krishnamurthy, S., Montalti, M., Lie, L., Houlton, A., Horrocks, B., …Šiller, L. (2005). Reactions and luminescence in passivated Si nanocrystallites induced by vacuum ultraviolet and soft-x-ray photons. Journal of Applied Physics, 98(4), Article 044316. https://doi.org/10.1063/1.2012511

Alkyl-modified siliconnanocrystallites are efficient fluorophores which are of interest for fundamental spectroscopic studies and as luminescent probes in biology because of their stability in aqueous media. In this work we have investigated these pa... Read More about Reactions and luminescence in passivated Si nanocrystallites induced by vacuum ultraviolet and soft-x-ray photons.

Gold film with gold nitride-A conductor but harder than gold (2005)
Journal Article
Šiller, L., Peltekis, N., Krishnamurthy, S., Chao, Y., Bull, S., & Hunt, M. (2005). Gold film with gold nitride-A conductor but harder than gold. Applied Physics Letters, 86(22), https://doi.org/10.1063/1.1941471

The formation of surface nitrides on gold films is a particularly attractive proposition, addressing the need to produce harder, but still conductive, gold coatings which reduce wear but avoid the pollution associated with conventional additives. Her... Read More about Gold film with gold nitride-A conductor but harder than gold.

Nitrogen ion irradiation of Au(110) : Photoemission spectroscopy and possible crystal structures of gold nitride (2004)
Journal Article
Krishnamurthy, S., Montalti, M., Wardle, M., Shaw, M., Briddon, P., Svensson, K., …Šiller, L. (2004). Nitrogen ion irradiation of Au(110) : Photoemission spectroscopy and possible crystal structures of gold nitride. Physical review B, 70(4), https://doi.org/10.1103/physrevb.70.045414

Photoemission spectroscopy demonstrates the formation of a surface gold nitride upon irradiation of a Au(110) surface with 500 eV nitrogen ions at room temperature. After irradiation two N1s peaks are observed at binding energies of 396.7±0.2 eV and... Read More about Nitrogen ion irradiation of Au(110) : Photoemission spectroscopy and possible crystal structures of gold nitride.