[1]
	Assistant Professor
	Mechanical Engineering
	Phone:	215-204-3774
	Email:	hughesr@temple.edu [2]
	Website:	Group Research [3]

Degrees

• Research Scientist, Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada.
• Ph. D. Physics, McMaster University, Hamilton, Ontario, Canada.
• B.Sc. Physics with Energy and Fuel Science, Lakehead University, Thunder Bay, Ontario, Canada.

Research Interests

• Templated Assembly of Nanostructured Arrays
• Heteroepitaxial growth of thin films and nanostructures
• Noble metal nanostructures
• Magnetic shape memory materials
• Oxide superconductors and ferroelectrics

Publications

• K.D. Gilroy, P. Farzinpour, A. Sundar, T. Tan, R.A. Hughes, S. Neretina, “Substrate-based galvanic replacement reactions carried out on heteroepitaxially formed silver templates”, Nano Res., DOI: 10.1007/s12274-013-0319-5 (2013).
• P. Farzinpour, A. Sundar, K. D. Gilroy, Z. E. Eskin, R. A. Hughes, S. Neretina, “Dynamic templating: A large area processing route for the assembly of periodic arrays of sub-micrometer and nanoscale structures”, Nanoscale 5, 1929-1938 (2013).
• P. Farzinpour, A. Sundar, K. D. Gilroy, Z. E. Eskin, R. A. Hughes, S. Neretina,  “Altering the dewetting characteristics of ultrathin gold and silver films using a sacrificial antimony layer”, Nanotechnology 23, 495604 (2012).
• A. Sundar, C. Decker, R.A. Hughes, S. Neretina, “The Templated Assembly of Highly Faceted Three-Dimensional Gold Microstructures into Periodic Arrays” Mater. Lett. 76, 155-158 (2012).
• A. Sundar, R.A. Hughes, P. Farzinpour, K.D. Gilroy, G.A. Devenyi, J.S. Preston, S. Neretina, “Manipulating the Size Distribution of Supported Gold Nanostructures”, Appl. Phys. Lett. 100, 013111 (2012).
• G.A. Devenyi, S. Y. Woo, S. Chanad-Tavakoli, R.A. Hughes, R.N. Kleiman, G.A. Botton, J.S. Preston, “The Role of Vicinal Silicon Surfaces in the Formation of Epitaxial Twins during the Growth of III-V Thin Films”, J. Appl. Phys. 110, 124316 (2011).
• Y.P. Zhang, R.A. Hughes, J.F. Britton, P.A. Dube, J.S. Preston, J.A. Botton, M. Niewczas, “Magnetocaloric Effect in Ni-Mn-Ga Thin Films under Concurrent Magnetostructural and Curie Transitions”‘, J. Appl. Phys. 110, 013910 (2011).
• E.C. Dreaden, S. Neretina, W. Qian, M.A. El-Sayed, R.A. Hughes, J.S. Preston, and P. Mascher, “Plasmonic Enhancement of Nonradiative Charge Carrier Relaxation and Proposed Effects from Enhanced Radiative Electronic Processes in Semiconductor-Gold Core-Shell Nanorod Arrays”, J. Phys. Chem. C 115, 5578-5583 (2011).
• Neretina S., Hughes R.A., Stortz G., Preston J.S., Mascher P., The Rapid Prototyping of Textured Amorphous Surfaces for the Graphoepitaxial Deposition of CdTe Films using Focused Ion Beam Lithography, Appl. Phys. A 102, 259-264 (2011).
• Zhang Y. P., Hughes R. A., Preston J. S., Botton G. A. and Niewczas M., Self-activated reversibility in the magnetically induced reorientation or martensitic variants in ferromagnetic Ni-Mn-Ga, Physical Review B 81, 054406 (2010).
• Keogh D., Chen Z., Hughes R. A., Dabkowski A., Marinov O., Maunders C., Gunawan L., Deen M. J., Preston J. S., and Botton G. A., (100) MgAl₂O₄ as a Lattice-Matched Substrate for the Epitaxial Thin Film Deposition of the Relaxor Ferroelectric PMN-PT, Applied Physics A 98, 187 (2010).
• Devenyi G. A., Li J., Hughes R. A., Shi A-C., Mascher P. and Preston J. S., Epitaxially Driven Formation of Intricate Supported Gold Nanostructures on a Lattice-Matched Oxide Substrate, Nano Letters 9, 4258 (2009).
• Neretina S., Dreaden E. C. Qian W., El-Sayed M. A., Hughes R. A, Preston J. S., and Mascher P., The Dependence of the Plasmon Field Induced Nonradiative Electronic Relaxation Mechanisms on the Gold Shell Thickness in Vertically Aligned CdTe-Au Core-Shell Nanorods, Nano Letters 9, 3772  (2009).
• Neretina S., Hughes R. A., Britten J. F., Sochinskii N. V., Preston J. S., and Mascher P., The Role of Substrate Surface Termination in the Deposition of (111) CdTe on (0001) Sapphire, Applied Physics A 96, 429 (2009).
• Shao Y., Hughes, R. A, Dabkowski A., Britten J.F, Gong W. H., Lazar S., Preston J. S., and Botton G. A., The role of lattice misfit strains in the deposition of epitaxial (Ba_1-ySr_y)Ti_0.5Nb_0.5O₃ films, Journal of Crystal Growth 311, 2753 (2009).
• Neretina S., Qian W., Dreaden E.C., El-Sayed M.A., Hughes R.A., Preston J.S. and Mascher P., Exciton lifetime tuning by changing the plasmon field orientation with respect to the exciton transition moment direction: CdTe-Au core-shell nanorods, Nano Letters 9, 1242 (2009).
• Neretina S., Hughes R.A., Devenyi G.A., Sochinskii N.V., Preston J.S., and Mascher P., Atypical grain growth for (211) CdTe films deposited on surface reconstructed (100) SrTiO₃ substrates, Applied Surface Science 255, 5674 (2009).
• Zhang Y., Hughes R.A., Britten J.F., Gong W., Preston J.S., Botton G.A., and Niewczas M., Epitaxial Ni-Mn-Ga films derived through high temperature in situ depositions, Smart Materials & Structures 18, 025019 (2009).
• Shao Y., Hughes, R. A, Dabkowski A., Radtke G., Gong W. H., Preston J. S., and Botton G. A., Structural and transport properties of epitaxial niobium-doped BaTiO₃ films, Applied Physics Letters 93, 192114 (2008).
• Neretina S., Qian W., Dreaden E., Ei-Sayed M.A., Hughes R.A., Preston J.S., Mascher P., Plasmon field effects on the nonradiative relaxation of hot electrons in an electronically quantized system: CdTe-Au core-shell nanowires, Nano Letters 8, 2410 (2008).
• Neretina S., Hughes R. A., Devenyi G. A., Sochinskii N. V., Preston J. S. and Mascher, P., The role of substrate surface alteration in the fabrication of vertically aligned CdTe nanowires, Nanotechnology 19, 185601 (2008).
• Neretina S., Hughes R. A., Britten J. F., Sochinskii  N. V., Preston J. S., and Mascher P., Vertically aligned wurtzite CdTe nanowires derived from a catalytically driven growth mode, Nanotechnology 18, 275301 (2007).
• Neretina S., Mascher P., Hughes R. A., Braidy N., Gong W. H., Britten J. F., Preston J. S., Sochinskii N. V., and Dippo P., Evolution of wurtzite CdTe through the formation of cluster assembled films, Applied Physics Letters 89,  133101  (2006).
• Neretina S., Zhang Q., Hughes R. A., Britten J. F., Sochinskii N. V., Preston J. S., and Mascher P., The role of lattice mismatch in the deposition of CdTe thin films, Journal of Electronic Materials 35, 1224 (2006).
• Luo Y., Hughes R.A., Preston J.S., and Botton G.A., Microstructure and current transport properties of single-layer YBa₂Cu₃O_7-x and multiple-layer YBa₂Cu₃O_7-x / (Ba_0.05Sr_0.95)TiO₃ superconductor films, Thin Solid Films 488, 217 (2005).
• Nam J., Hughes R.A., Castellan J.P., Gaulin B.D., Britten J.F., and Preston J.S., The origin of preferential twinning in YBa₂Cu₃O_7-δ thin films deposited on the (001) NdGaO₃ substrate, Journal of Applied Physics 97, 23906 (2005).
• Palmer B.S., Drew H.D., Hughes R.A., and Preston J.S., Percolative effects in oxygen-depleted YBa₂Cu₃O_x wires, Physical Review B  70, 184511 (2004).
• Rigal L.B., Schmadel D.C., Drew H.D., Maiorov B., Osquiguil E., Preston J.S., Hughes R. and Gu G.D., Magneto-optical evidence for a gapped Fermi surface in underdoped YBa₂Cu₃O_6+x, Physical Review Letters 93, 137002 (2004).
• Nam J., Hughes R.A., Dabkowski A., and Preston J.S., Detwinning YBa₂Cu₃O_7-δ thin films, Applied Physics Letters 82, 3728 (2003).
• Cerne J., Grayson M., Schmadel D.C., Jenkins G.S., Drew H.D., Hughes R., Dabkowski A., Preston J.S., and Kung P.J., Infrared Hall effect in high-Tc superconductors: Evidence for non-Fermi-liquid Hall scattering, Physical Review Letters 84, 3418 (2000).
  
• Korolev K.A., Shadrin P.M., Preston J.S., Hughes R.A., Nam J.K., and Pavlovskii V.V., Local characterization of HTS thin films by laser scanning microscopy, Physica C 341, 1435 (2000).
• Cerne J., Grayson M., Schmadel D.C., Simpson J., Drew H.D., Hughes R., Preston J.S., Kung P.J., The AC Hall effect in YBCO: temperature and frequency dependence of Hall scattering, Physica B 284, 941 (2000).
• Grayson M., Cerne J., Drew H.D., Schmadel D.C., Hughes R., Preston J.S., Kung P.J., Vale L. The infrared Hall effect in YBCO: Temperature and frequency dependence of Hall scattering, Journal of Low Temperature Physics 117, 1055 (1999).
• Lindgren M., Currie M., Williams C., Hsiang T.Y., Fauchet P.M., Sobolewski R., Moffat S.H., Hughes R.A., Preston J.S., and Hegmann F.A., Intrinsic picosecond response times of Y-Ba-Cu-O superconducting photodetectors, Applied Physics Letters 74, 853 (1999).
• Terentiev A.N., Moffat S.H., Hughes R.A., Preston J.S., vanLierop J., and Harrison J.P., Switching speed for controlled damping using thin film YBa₂Cu₃O_7-δ, Cryogenics 37, 113 (1997).
• Moffat S.H., Hughes R.A. and Preston J.S., Quantum fluctuations in current-carrying thin films of YBa₂Cu₃O_7-δ, Physical Review B 55, R14741-4 1997.
• Lindgren M., Currie M., Williams C.A., Hsiang T.Y., Fauchet P.M., Sobolewski R., Moffat S.H., Hughes R.A., Preston J.S., and Hegmann F.A., Ultrafast photoresponse in microbridges and pulse propagation in transmission lines made from high-T-c superconducting Y-Ba-Cu-O thin films, IEEE Journal of Selected Topics in Quantum Electronics 2, 668  (1996).
• Hegmann F.A., Jacobsperkins D., Wang C.C., Moffat S.H., Hughes R.A., Preston J.S., Currie M., Fauchet P.M., Hsiang T.Y., Sobolewski R., Electrooptic sampling of 1.5-PS photoresponse signal from YBa₂Cu₃O_7-δ thin films, Applied Physics Letters 67, 285 (1995).
• Hegmann F.A., Hughes R.A., and Preston J.S., Picosecond photoresponse of epitaxial YBa₂Cu₃O_7-δ thin films, Applied Physics Letters 64, 3172 (1994).
• McConnell A.W., Hughes R.A., Dabkowski A., Dabkowska H.A., Preston J.S., Greedan J.E., and Timusk T., Evaluation of LaSrGaO₄ as a substrate for YBa₂Cu₃O_7-δ Physica C 225, 7 (1994).
• Basov D.N., Puchkov A.V., Hughes R.A., Strach T., Preston J., Timusk T., Bonn D.A., Liang R., and Hardy W.N., Disorder and superconducting-state conductivity of single-crystals of YBa₂Cu₃O_6.95, Physical Review B 49, 12165 (1994).
• Basov D.N., Puchkov A.V., Hughes R.A., Strach T., Timusk T., Bonn D.A., Liang R., and Hardy W.N., Optical Study of Localization in the ab-plane conductivity of single-crystals of YBa₂Cu₃O_6.95 induced by ion damage, Journal of Superconductivity 7, 497 (1994).
• Hughes R.A., Lu Y., Timusk T., and Preston J.S., Normal-state optical properties of Nd_1.85Ce_0.15CuO_4+δ Physical Review B 47 985 (1993).
• Lu Y., Hughes R.A., Strach T., Timusk T., Poulin D., and Preston J.S., Growth of Nd_1.85Ce_0.15CuO_4+δ thin films by laser ablation, Physica C 197, 75 (1992).
• Hughes R.A., Lu Y., Timusk T., and Preston J.S., Growth of           (Pb_0.75Cu_0.25)Sr₂(Y_1-YCa_Y)Cu₂O₇ thin films by laser ablation, Applied Physics Letters 59, 2597 (1991).
• Hughes R.A., Lu Y., Timusk T., and Preston J.S., In-situ growth of PbSrYCaCuO films by laser ablation, Applied Physics Letters 58, 762 (1991).
• Timusk T., Reedyk M., Hughes R., Bonn D.A., Garrett J.D., Greedan J.E., Stager C.V., Tanner D.B., Gao F., Herr S.L., Kamaras K., Thomas G.A., Cooper S.L., Orenstein J., Schneemeyer L.F., and Millis A.J., Infrared Studies of high-T_c superconductors, Physica C 162,  841 (1989).
• Reedyk, M., Hughes, R., Bonn, D.A., Garrett, J.D., Greedan, J.E., Stager, C.V., Timusk, T., Kamaras, K., Tanner, D.B., Cooper, S.L., Thomas, G.A., and Yeh, J.J., Far-infrared ab plane reflectance and transmission of Bi₂Sr₂CaCu₂O₈, Physica C 162-164,  1083 (1989).
• Hughes R.A., Timusk T., Cooper S.L., Thomas G.A., Yeh J.J., Hong M., Far-infrared transmission of Bi₂Sr₂CaCu₂O₈ films, Physical Review B 40 5162 (1989).

Proceedings

• M.P. Mackinnon, K.D. Gilroy, A. Sundar, R.A. Hughes, S. Neretina, “The Formation of Supported Gold Nanostructures on Oxide Substrates”‘, Fall 2011 ASEE Middle Atlantic Section Proc. Proc. (2011).
• K.D. Gilroy, M.S. Islam, R.A. Hughes, B. Lee, Y. Sun, S. Neretina, “A Fabrication Procedure for a CdTe Quantum Dot Printable Hybrid Solar Cell”, Fall 2011 ASEE Middle Atlantic Section Proc. Proc. (2011).
• Neretina S.,  Grebennikov D., Hughes R.A., Weber M., Lynn K.G., Simpson P.J., Preston J.S. and Mascher P., Defect characterization of CdTe thin films using a slow positron beam, Physica Status Solidi 4, Papers presented at the 14th International Conference on Positron Annihilation, ICPA 14, 3659 (2007).
• Neretina S., Hughes R.A., Sochinskii N.V., Weber M., Lynn K.G., Wojcik J., Pearson G.N., Preston J.S., Mascher P., Growth of CdTe/Si(100) thin films by pulsed laser deposition for photonic applications, Journal of Vacuum Science & Technology A  24, 606 (2006).
• Nam J., Hughes R.A., Dabkowski A., and Preston J.S., Laser scanning microscopy studies on detwinned YBa2Cu3O7-δ thin films, IEEE Transactions on Applied Superconductivity 15, 3082 (2005).
• Neretina S., Hughes R.A.; Preston J.S., Sochinskii N.V., and Mascher P., CdTe:Ge/Si (100) thin films grown by pulsed laser deposition (PLD) for photonic devices, Proceedings of the SPIE – The International Society for Optical Engineering, 5970, 59700Y-1-6 (2005).
• Kristoffersen, A.K., Tiedje, H., Hughes, R.A., Haugen, H., Timusk, T., and Preston J.S., Terahertz pump-probe spectroscopy of YBCO thin films, Proceedings of the SPIE – The International Society for Optical Engineering, 5579 750-8 (2004).
• Kristoffersen A.K., Tiedje H., Hughes R.A., Haugen H., Timusk, T., and Preston J.S., Terahertz pump-probe spectroscopy of YBCO thin films, Proceedings of SPIE – The International Society for Optical Engineering, Applications of Photonic Technology 7C: Closing the Gap Between Theory, Development, and Application – Photonics North 2004, Photonics Applications in Telecommunications, Sensors, Software, and Lasers, 5579 750 (2004).
• Shadrin P.M., Korolev K.A., Hughes R.A., Nam J.K., and Preston J.S., Local characterization of Y-Ba-Cu-O thin films Source: IEEE Transactions on Applied Supeconductivity 11, 3226 (2001).
• Lindgren M., Currie M., Williams C., Hsiang T.Y., Fauchet P.M., Sobolewski R., Moffat S.H., Hughes R.A., Preston J.S., and Hegmann F.A., YBa2Cu3O7-x thin-film picosecond photoresponse in the resistive state, IEEE Transactions on Applied  Superconductivity 7, 3422 (1997).
• Moffat S.H., Hughes R.A., Poulin G.D., Preston J.S., Basov D.N., Strach T., and Timusk T., Correlations between critical current density and penetration depth in ion irradiated YBa2Cu3O7 thin films, IEEE Transactions on Applied Superconductivity 7,  2005 (1997).
• Lindgren M., Currie M., Williams C., Moffat S.H., Hughes R.A., Hegmann F.A., Preston J.S., Hsiang T.Y., and Sobolewski R., Picosecond photoresponse of YBa2Cu3O7-x thin films, Czechoslovak Journal of Physics 46, 1111 (1996).
• van Lierop J., Moffat S.H., Harrison J.P., Hughes R.A., Preston J.S., Terentiev A.N., Flux dynamics in thin films of YBa2Cu3O7-δ, Czechoslovak Journal of Physics 46, 1633 (1996).
• Hegmann F.A., Hughes R.A. and Preston J.S., High speed kinetic inductive bolometric photoresponse of epitaxial YBa2Cu3O7-δ thin films, Proceedings of the SPIE – The International Society for Optical Engineering 2159, 88 (1994).
• Hughes R.A., Lu Y., Timusk T., and Preston, J.S., Growth of 1212 PbSrYCaCuO and NdCeCuO films, AIP Conference Proceedings 251, 53 (1992).
• Dabkowska, H., Dabkowski A., Greedan J.E., Hughes R., Lu Y., Poulin D., Preston J., Strach T., and Timusk T., Single crystal growth and properties of NdGaO3, NdyPr1-yGaO3 and LaAl1-xGaxO3 as substrates for high temperature superconductors,  AIP Conference Proceedings 251, 102 (1992).
• Timusk T., Reedyk M., Hughes R.A., Bonn D.A., Garrett J.D., Greedan J.E., Stager C.V., Tanner D.B., Feng Gao, Herr S.L., Kamaras K., Thomas G.A., Cooper S.L., Orenstein J., Schneemeyer L.F., and Millis A.J., Infrared studies of two high Tc superconductors, Proceedings of the XI Winter Meeting on Low Temperature Physics. Ceramic Superconductors 103 (1991).

Patent

• Hughes R. A., Turner P. J., and Preston J. S., Composite High-T_c Superconducting Film, Issue date: Nov 30, 1999.

Present Teaching

• ENGR 3496 – Materials Science for Engineers