Dr. Oomman Varghese, Associate Professor of Physics

College of Natural Sciences and Mathematics , Department of Physics

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• Areas of expertise

  • Nanomaterials and devices
  • Solar cells
  • Solar fuel generation
  • Environmental sensing

• Awards

  • Ranked 9th in the Thomson Reuters' list of World's top 100 Materials Scientists in the past decade (selected based on citation impact scores of journal publications)
  • Nominated for 2011 Eni International award in ‘New Frontiers of Hydrocarbons’
  • Listed in Who’s who in America (2007 – 2012), Who’s Who in the World (2008) and Who’s Who in Science and Engineering (2008), Marquis Publishing, NJ
  • University Grants Commission (UGC) and Council of Scientific and Industrial Research (CSIR), India, Lectureship, 1997
  • Council of Scientific and Industrial Research (CSIR), India, Senior Research Fellowship, 1997
  • Indian Institute of Technology Delhi, India, Junior Research Fellowship, 1994

• Publications

  • Long Vertically Aligned Titania Nanotubes on Transparent Conducting Oxide for Highly Efficient Solar Cells, O.K. Varghese, M. Paulose and C.A. Grimes, Nature Nanotech., 4, 592-597 (2009)
  • High-rate solar photocatalytic conversion of CO2 and water vapor to hydrocarbon fuels, O.K. Varghese, M. Paulose, T.J. La Tempa and C.A. Grimes, Nano Lett., 9, 731-737 (2009)
  • Appropriate strategies for determining the photoconversion efficiency of water photoelectrolysis cells: A review with examples using titania nanotube array photoanodes, O.K. Varghese and C.A. Grimes, Sol. Energ. Mat. Sol. Cells, 92, 374-384 (2008)
  • High efficiency double heterojunction polymer photovoltaic cells using highly ordered TiO2 nanotube arrays, G.K. Mor, K. Shankar, M. Paulose, O.K. Varghese and C.A. Grimes, Appl. Phys. Lett., 91, 152111 (2007)
  • Water-photoelectrolysis properties of highly-ordered titania nanotube-arrays, O.K. Varghese, M. Paulose, K. Shankar, G.K. Mor and C.A. Grimes, J. Nanosci. Nanotechnol., 5, 1158 – 1165 (2005)
  • Extreme Changes in the electrical resistance of titania nanotubes with hydrogen exposure, O.K. Varghese, D. Gong, M. Paulose, K.G. Ong, E.C. Dickey and C.A. Grimes, Adv. Mater., 15, 624-627 (2003)
  • Gas sensing Characteristics of Multi-wall carbon nanotubes, O.K. Varghese, P.D. Kichambre, D. Gong, E.C. Dickey and C.A. Grimes, Sens. Actuators B, 81, 32-41 (2000)
  • Studies of Ambient Dependent Electrical Behavior of Nano-Crystalline SnO2 thin films using impedance spectroscopy, O.K. Varghese and L.K. Malhotra, J. Appl. Phys., 87, 7457-7465 (2000) 

  For more publications, see CV below and google scholar profile, here.

• Patents

  • High-Yield Visible Light Photocatalytic Conversion of CO₂ to Hydrocarbons, O.K. Varghese, M. Paulose and C.A. Grimes, US & European patents pending
  • Fabrication of Highly-ordered TiO₂ nanotube-arrays of great length, M. Paulose, S. Yoria, K. Shankar, O.K. Varghese and C.A. Grimes, US patent pending
  • Titania nanotube arrays for use as sensors and method of producing, O.K. Varghese, G.K. Mor. M. Paulose and C.A. Grimes, US patent # 7,011,737 B2

• Grants and Funded Research

  • None available

  For more research information, see faculty website above, CV below, or visit researchgate profile here.

• Curriculum Vitae

  • Oomman Varghese CV

• Contact information

  Science and Research 1, Room 515E

  Phone: (713) 743-3808

  okvarghese@uh.edu