RESEARCH IN NANOCRYSTALS & NANOWIRES

• Kennedy, T., Mullane, E., Geaney, H., Osiak, M., O’Dwyer, C. Ryan, K. M. High-Performance Germanium Nanowire-Based Lithium-Ion Battery Anodes Extending over 1000 Cycles Through in Situ Formation of a Continuous Porous Network. Nano Lett., 2014, 14 (2), pp 716–723  PDF 

• Wang, J., Liu, P., Seaton, C., Ryan, K. M.Complete Colloidal Synthesis of Cu2SnSe3 Nanocrystals with Crystal Phase and Shape Control  J. Am. Chem. Soc. 2014, 136, 7954−7960  PDF

• Singh, S.   Singh, A.   Palaniappanan, K.  Ryan, K. M. Colloidal synthesis of      homogeneously alloyed CdSexS1−x nanorods with compositionally tunable      photoluminescence Chem. Commun., 2013,49, 10293-10295 PDF

• Singh, A., Singh, S., Levcenko, S., Unold, T., Laffir, F., Ryan, K. M. Compositionally Tunable Photoluminescence Emission in Cu₂ZnSn(S_1−xSe_x)₄ Nanocrystals,  Angewandte Chemie International Edition  52,  pages 9120–9124, (2013) PDF

• Wang, J. Singh, A., Liu, P. Singh, S. Coughlan, C. Guo, Y.  Ryan, K. M.  Colloidal Synthesis of Cu₂SnSe₃  Tetrapod Nanocrystals Journal of the American Chemical Society , 135, 7835-7838, 2013 [ button link=”http://pubs.acs.org/doi/abs/10.1021/ja403083p” size=”small” style=”download” window=”yes”]PDF[/button]

• Geaney, H. Mullane, E. Ryan, K. M. Solution phase      synthesis of silicon and germanium nanowires J. Mater. Chem. C, 2013,1,      4996-5007 PDF

• Osiak, M., Armstrong, E., Kennedy, T., Torres, C. M. S., Ryan, K. M., O’Dwyer, C. Core-shell tin oxide, indium oxide, and indium tin oxide nanoparticles on silicon with tunable dispersion: Electrochemical and structural characteristics as a hybrid Li-ion battery anode. ACS Appl. Mater. Interfaces 5, 8195-8202 (2013).PDF

• Singh, A. Ryan, K. M.  Crystallization of Semiconductor Nanorods into Perfectly Faceted Hexagonal Superstructures     Part. Part. Syst. Charact. 30, pp 624–629, (2013), DOI: 10.1002/ppsc.201300008 PDF

• Geaney, H., Mullane, E. Ramasse, Q. M. and Ryan, K. M.  Atomically Abrupt Silicon–Germanium Axial Heterostructure Nanowires Synthesized in a Solvent Vapor Growth System Nano Letters.,  13 (4), pp 1675–1680, (2013) PDF

• Coughlan, C., Singh, A., Ryan, K. M. ‘Systematic Study into the Synthesis and Shape Development in Colloidal CuInxGa1-xS2 Nanocrystals‘ Chem. Mater., 2013, 25 (5), pp 653–661 PDF

• Bala, T,Singh, A,Sanyal, A,O’Sullivan, C,Laffir, F,Coughlan, C,Ryan, KM ‘Fabrication of Noble metal-semiconductor hybrid nanostructures using phase transfer‘. Nano Research, 6 :121-130. (2013) PDF

• Singh, A., English, N. J., Ryan, K. M. Highly ordered nanorod assemblies extending over device scale areas and in controlled multilayers by electrophoretic deposition, Journal of Physical Chemistry B, 117, 1608-1615, (2013) PDF

• Osiak, M. Khunsin, W., Armstrong, E., Kennedy, T., Torres, C. M. S., Ryan, K. M., O’Dwyer, C. Epitaxial growth of visible to infra-red transparent conducting In2O3 nanodot dispersions and reversible charge storage as a Li-ion battery anode, Nanotechnology, 24, 065401, 2013 PDF

• Geaney, H., Dickinson, C., O’Dwyer, C., Mullane, E., Singh, A., Ryan, K. M. Growth of Crystalline Copper Silicide Nanowires in High Yield within a High Boiling Point Solvent System, Chemistry of Materials, 24, 4319-4325, (2012) PDF

• Singh, A. Coughlan, C. Laffir, F. R. Ryan, K. M. Assembly of CuIn1-xGaxS2 Nanorods into Highly Ordered 2D and 3D Superstructures ACS NANO. 6, 6977-6983, (2012) PDF

• Singh, A. Dickinson, C. Ryan, K. M. Insight into the 3D Architecture and Quasicrystal Symmetry of Multilayer Nanorod Assemblies from Moire Interference Patterns ACS NANO, pp 3339-3345 (2012) PDF

(a) Angular dark-field STEM (DF-STEM) images shows different Moiré interference patterns arising from rotational offsets between respective monolayer sheets. (b) & (c) DF-STEM image with SAED pattern shows 12-fold quasicrystalline-like Moiré pattern revealed when the misorientation angle between two CdS nanorod layers is close to 30°.

• Mullane, E. Geaney, H. and Kevin M. Ryan Size controlled growth of germanium nanorods and nanowires by solution pyrolysis directly on a substrate Chemical Communications., ,48, 5446-5448 (2012)

• Singh, A. Geaney, H. Laffir, F. R. Ryan, K. M.  Colloidal Synthesis of Wurtzite Cu2ZnSnS4 Nanorods and their perpendicular Assembly Journal of the American Chemical Society. , 134, 2910−2913 (2012)

• Singh, A. Gunning, R. D., Ahmed, S., Barrett, C. A. English, N.J. Garate, J-A. Ryan, K. M. Controlled semiconductor nanorod assembly from solution: influence of concentration, charge and solvent nature, Journal of Materials Chemistry , 22, 1562-1569 (2012)

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• Geaney, H. Dickinson, C. Barrett, C. A. Ryan, K. M. High density germanium nanowire growth directly from copper foil by self-induced solid seeding, Chemistry of Materials, 23, 4838-4843, (2011)

• Kelly, D., Singh, A., Barrett, C. A., O’Sullivan, C. Coughlan, C. Laffir, F. R., O’Dwyer, C. Ryan, K. M. A Facile spin-cast route for cation exchange of multilayer perpendicularly-aligned nanorod assemblies, Nanoscale, 3, 4580-4583, (2011)

• Garate, J-A., English, N. J. Singh, A. Ryan, K. M. Mooney, D. A. and MacElroy, J. M. D. Electrophoretic Deposition of Poly(3-decylthiophene) onto Gold-Mounted Cadmium Selenide Nanorods. Langmuir 27, 13506-13513 (2011)

• Barrett, C. A., Singh, A., Murphy, J. A., O’Sullivan, C., Buckley, D. N. & Ryan, K. M. Complete Synthesis of Germanium Nanocrystal Encrusted Carbon Colloids in Supercritical CO(2) and their Superhydrophobic Properties. Langmuir 27, 11166-11173, doi:10.1021/la2020868 (2011).

• Godsell, J. F. Bala, T., Ryan, K.. M. Roy, S. An ac susceptibility study in capped Ni/Ni(OH)(2) core-shell nanoassemblies: dual peak observations. Journal of Physics D-Applied Physics 44, 325004 (2011) doi: 10.1088/0022-3727/44/32/325004

• Geaney, H.; Dickinson, C.; Weng, W.; Kiely, C. J.; Barrett, C. A.; Gunning, R. D.; Ryan, K. M. The Role of Defects and Growth Directions in the Formation of Periodically Twinned and Kinked Unseeded Germanium Nanowires. Crystal Growth & Design, 11, 3266-3272, (2011)

•  Bala, T. O’Sullivan, C. Singh, A. Ryan K. M. Silver tip formation on colloidal CdSe nanorods by a facile phase transfer protocol. Journal of Materials Chemistry 21, 6815-6820, doi: 10.1039/C0JM04324A, (2011).

•  Barrett, CA; Geaney, H; Gunning, RD; Ryan, K. M. Perpendicular growth of catalyst-free germanium nanowire arrays, Chemical Communications, 47 (13): 3843-3845, doi: 10.1039/c0cc05202g (2011)

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• O’Sullivan, S. Crilly, S. Laffir, F. R. Singh, A. Magner, E. & Ryan, K. M. Protein immobilisation on perpendicularly aligned gold tipped nanorod assemblies, Chemical Communications, 47, 2655-2657, doi: 10.1039/c0cc05182a (2011).

• Singh, A., R. D. Gunning, A. Sanyal and K. M. Ryan. Directing Semiconductor Nanorod Assembly into 1D or 2D Supercrystals by Altering the Surface Charge. Chemical Communications, 46 (38), pp. 7193-7195. ISSN: 1359-7345.

• O’Sullivan, C., R. D. Gunning, C. A. Barrett, A. Singh and K. M. Ryan. September 2010. Size Controlled Gold Tip Growth onto II-VI Nanorods. Journal of Materials Chemistry, 20 (36), pp. 7875-7880. ISSN: 0959-9428 (2010)

• Barrett, C.A., Gunning, R.D., Hantschel, T., Arstila, K., O’ Sullivan, C., Geaney, H., Ryan, Kevin M. ‘Synthesis of Silicon and Ge-Core/SiOx-Shell Nanowires from Metal Surfaces by Supercritical Fluid-Solid-Solid Growth’ J. Mat. Chem. 2010, 20 135.

• Gandhi, A. A., Gunning, R. D., Ryan, K. M. & Tofail, S. A. M. The Role of Texturing and Densification on Optical Transmittance of Hydroxyapatite Ceramics. Journal of the American Ceramic Society 93, 3773-3777, doi:10.1111/j.1551-2916.2010.03925.x (2010).

• Gunning, R. D., O’Sullivan, C. & Ryan, K. M. A multi-rate kinetic model for spontaneous oriented attachment of CdS nanorods. Physical Chemistry Chemical Physics 12, 12430-12435, doi:10.1039/c0cp00196a (2010).

• Sanyal, A., Bala, T., Ahmed, S., Singh, A. Piterina, A. V., McGloughlin, T. M., Laffir, F. R. and Ryan, K. M. Water Dispersible Semiconductor Nanorod Assemblies via a Facile Phase Transfer and Their Application as Fluorescent Biomarkers J. Mater. Chem. 2009, 19, 8974.

• Barrett, C.A., Dickenson, C., Ahmed, S., and Ryan, Kevin M. ‘Evolution of Pseudo-Spherical Silicon Nanocrystals to Tetrahedra, Mediated by Phosphonic Acid Surfactants’ Nanotechnology., 2009, 20, 275605.

• O’Sullivan, C.; Gunning, R. D.; Sanyal, A.; Barrett, C. A.; Geaney, H.; Laffir, F. R.; Ahmed, S.; Ryan, K. M. ‘Spontaneous room temperature elongation of CdS and Ag2S nanorods via oriented attachment’ Journal of the American Chemical Society 2009, 131, 12250-12257.

•  Ahmed, S. Ryan, K. M,’Centimeter scale assembly of vertically aligned and close packed semiconductor nanorods from solution’ Chemical Communications. 2009, 6421.

• Bala, T., Gunning, R. D., Venkatesan, M., Godshell, J., Roy, S., Ryan, K. M. Block copolymer mediated stabilization of sub-5 nm superparamagnetic nickel nanoparticles in an aqueous medium Nanotechnology. 2009, 20, 415603

• Ahmed, S., Ryan, K. M. Close-Packed Gold-Nanocrystal Assemblies Deposited withComplete Selectivity into Lithographic Trenches Adv. Mater, 2008 DOI: 10.1002/adma.200801007

• O’Sullivan, C. Ahmed, S. Ryan, K. M. ‘Gold tip formation on perpendicularly aligned semiconductor nanorod assemblies’ J. Mat. Chem. 18, 5218, 2008.

• Ahmed,S. Ryan K. M. Self-Assembly of Vertically Aligned Nanorod Supercrystals Using Highly Oriented Pyrolytic Graphite Nanoletters (2007), 7, 2480

• Ryan, K. M., Mastroianni, A., Stancil, K. A., Liu, H., Alivisatos, A. P. Electric Field Assisted Assembly of Perpendicular Oriented Nanorod Superlattices, Nanoletters. 6, 1479-1482, 2006

• Hant, S. H., Attard, G. A. & Ryan, K. M. Periodic Binary Si:Ti, Si:Al Mixed Macroporous Oxides with Ultra-High Heteroatom Loading: A Facile Sol-Gel Approach. Chem. Mater, 17, 1434, 2005,

• Ryan, K. M., Lyons, D. M. Holmes, J. D. Farrell, R. Brennan, E. Morris, M. A. Controlling Morphological, Orientational and Material Properties of Mesoporous Aluminosilicate Films Studies in Surface Science and Catalysis 156, 303-314 (2005)

• Pursanien, O, L. J., Baumberg, J. J., Ryan, K. M., Bauer, J, Winkler, H. Viel, B., Ruhl, T. Compact Strain-sensitive flexible photonic crystals for sensors Applied Physics Letters, 87, 101902, (2005)

• Hanrahan, J. P., Copley, M. P., Ryan, K. M., Morris, M. A. & Holmes, J. D. Pore expansion in mesoporous silicas using supercritical carbon dioxide. Chemistry of Materials. 16, 424-427 (2004).

• Ziegler, K. J., Polyakov, B., Kulharni, Ryan, K. M., Morris, M. A., Erts, D. & Holmes, J. D. Conductive films of ordered nanowire arrays. Journal of Materials Chemistry. 14, 585-589 (2004).

• Ziegler, K. J., Ryan, K. M., Rice, R., Crowley, T. A., Erts, D., Olin, H., Patterson, J., Spalding, T. R., Holmes, J. D. & Morris, M. A. The synthesis of matrices of embedded semiconducting nanowires. Journal of the Chemical Society: Faraday Discussions 125, 311-326 (2004).

• Ryan, K. M., Erts, D., Olin, H., Morris, M. A. & Holmes, J. D. Three dimensional architectures of ultra-high density semiconducting nanowires deposited on chip. Journal of the American Chemical Society. 125, 6284-6288 (2003).

• Ziegler, K. J., Harrington, P. A., Ryan, K. M., Crowley, T. A., Holmes, J. D. & Morris, M. A. Supercritical fluid preparation of copper nanotubes and nanowires using mesoporous templates. Journal of Physics: Condensed Matter 15, 8303-8314 (2003).

• Ryan, K. M., McGrath, J. P., Farell, R. A., O’Neill, W. M., Barnes, C. J. & Morris, M. A. Measurements of the lattice constant of ceria when doped with lanthana and praseodymia—the possibility of local defect ordering and the observation of extensive phase separation. Journal of Physics: Condensed Matter 15, L49-L58 (2003).

• Holmes, J. D., Morris, M. A. & Ryan, K. M. Macroporous materials as templates for semiconductor nanowire assembly book chapter in Self assembly (ed. Robinson, B. H.) 175-183 (IOS Press, Amsterdam, 2003).

• Lyons, D. M., Morris, M. A. & Ryan, K. M. The preparation of ordered mesoporous ceria with advanced stability. Journal of Materials Chemistry. 12, 1207-1212 (2002).

• Lyons, D. M., Ryan, K. M., Morris, M. A. & Holmes, J. D. Tailoring the optical properties of nanowires through strain. Nanoletters. 2, 811-816 (2002).

• Ryan, K. M., Coleman, N. R. B., Lyons, D. M., Hanrahan, J. P., Spalding, T. R., Morris, M. A., Steytler, D. C., Heenan, R. K. & Holmes, J. D. Control of pore morphology in mesoporous silicas synthesised from triblock copolymer templates. Langmuir 18, 4996-5001 (2002).

• Ryan, K. M., Holmes, J. D., Crowley, T. A. & Morris, M. A. The use of templated mesoporous materials as templates for the development of ordered arrangements of nanowires and nanorods of electronically important materials Studies in Surface Science and Catalysis 141, 337-343 (2002).

• Coleman, N. R. B., Ryan, K. M., Spalding, T. R., Holmes, J. D. & Morris, M. A. The formation of dimensionally ordered germanium nanowires within mesoporous silica. Chemistry Physics Letters. 343, 1-6 (2001).

• Coleman, N. R. B., O’Sullivan, N., Ryan, K. M., Crowley, T. A., Spalding, T. R., Steytler, D. C., Morris, M. A. & Holmes, J. D. Synthesis and characterization of dimensionally ordered semiconductor nanowires within mesoporous silica. Journal of the American Chemical Society 123, 7010-7016 (2001).11.

Scopus listed publications (Conference Proceedings)

1. Ahmed, S.; Barrett, C. A.; O’Sullivan, C.; Sanyal, A.; Geaney, H.; Singh, A.; Gunning, R. D.; Ryan, K. M. , ‘Electrphoretic Deposition of Spherical and Rod Shaped Nanocrystals’ ECS Transactions 2009, 19, 209-219.
2. O’Sullivan, C.; Gunning, R.; Barrett, C.; Singh, A.; Geaney, H.; Sanyal, A.; Ahmed, S.; Bala, T.; Ryan, K. Facet Specific Gold Tip Growth on Semiconductor Nanorod Assemblies ECS Transactions 2009, 25, 17-29.
3. Ryan, K. M.; Ahmed S. : Vertical Aligned Nanorod Assembly by Electrophoretic Deposition from Organic Solvents: Towards Aligned Nanorod Solar Cells, in Next-Generation and Nano-Architectured Photovoltaics; Mater. Res. Soc. Symp. Proc. Volume 1121E, Boston, MA, 2008; 1121-N15-05
4. Patents Ryan, K. M., Holmes, J. D., Lawton, W. J. & Morris, M. A. Method of fabrication of low dielectric constant porous metal silicate film. Patent US 6699797, UCC and INTEL Corporation (2003)