(Left) Electron per photon efficiency spectrum for the three electrode photoelectrochemical cell containing reaction center (RC) protein complexes and both charge carrier mediators, quinone and cytochrome c (black symbols), compared with the absorbance spectrum of RC in 0.1 M Tris buffer (red line). (Right) Photocurrent action spectrum obtained for the cell containing RC, Cyt c and Q2 in the electrolyte.
(Left) . UV–Vis optical absorption spectra of the prepared 1 wt% crystalline TiO2 suspended in water at different pH levels ranging from 7.3 to 10.3. (Right) XRD patterns of dried TiO2 crystalline particles prepared from solutions at different pH (7.3 to 10.3) annealed at 90◦C.
(Left) XPS survey spectra of treated and untreated surfaces and (Right) C1s and O1s core spectra of the treated and untreated surfaces.
nano-indentation on PC substrate coated with TiO2 film and uncoated PC substrate.
XPS survey spectra for TiO2 thin films annealed between 100 and 500 °C.
Load-displacement curves and displacement during hold time (creep) for the TiO2 films annealed between 100 and 500°C.
Schematics of the electrode-electrolyte interface (double layer charges) in supercapacitors. The charge arrangement can be modeled with capacitors. (a) Electrochemical reaction at the surface of the electrode results in charge loss & (b) Application of a thin blocking layer decreases the reaction rate and enhances the energy storage capability. 
Self-discharge profile in two supercapacitors with and without the blocking layer. Both capacitors were charged at 2.0 V for 18 h prior to open circuit voltage measurement.
Schematics of the electrode–electrolyte interface in supercapacitors. The charge arrangement can be modeled with capacitors. (a) Leakage (charge loss ) are caused by electrochemical reaction at the surface of the electrode (b) Application of a thin blocking layer decreases the electrochemical reaction rate (From: Tevi, T., Yaghoubi, H., Wang, J., & Takshi, A. (2013). Application of poly (p-phenylene oxide) as blocking layer to reduce self-discharge in supercapacitors. Journal of Power Sources, 241, 589-596.)
Atomic Force Microscopy 3D topographic images of: (a) a glassy carbon surface and (b) electrodeposited poly (p-phenylene oxide) on the glassy carbon electrode surface. The images were obtained in air with noncontact tapping mode. (From: Tevi, T., Yaghoubi, H., Wang, J., & Takshi, A. (2013). Application of poly (p-phenylene oxide) as blocking layer to reduce self-discharge in supercapacitors. Journal of Power Sources, 241, 589-596. Supplementary information)
Fig a and b - Fabricated flexible triple layer sctretchable conductor, Fig c - Measured S11 and S21 performance of the flat multilayer elastic conductor in 0 % Strain condiction , Fig d - Triple layer SC based aperture coupled patch antenna.
Liyakath, R.A.; Takshi, A.; Mumcu, G., "Multilayer Stretchable Conductors on Polymer Substrates for Conformal and Reconfigurable Antennas," Antennas and Wireless Propagation Letters, IEEE , vol.12, no., pp.603,606, 2013
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8Publications
Invited Book Chapter & Reviews
• Houman Yaghoubi, Self-Cleaning Materials for Plastic and Plastic-Containing Substrates. Self-Cleaning Materials and Surfaces: A Nanotechnology Approach. Daoud, W. A., Tung, W.S., Ed. John Wiley & Sons, Ltd.: London, UK, 2013; ISBN: 978-1-119-99177-9, p 153-202.
Refereed Journal Articles
• Houman Yaghoubi*, Zhi Li, Rudy Schlaf, and Arash Takshi, Towards a Sunlight-Driven Photocatalyst: The Role of Surface States-Induced Electronic Gap of Surfactant-Free Pure Anatase Nanoparticles, under review.
• Houman Yaghoubi*, Zhi Li, Daniel Jun, Joanna E. Slota, Rudy Schlaf, J. Thomas Beatty, and Arash Takshi, Cytochrome c-coupled Wild Type Photosynthetic Reaction Center Bio-Hybrid Solar Cell, under review.
• Houman Yaghoubi*, Alireza Dayerizadeh, Sungyub Han, Mentor Mulaj, Wenyang Gao, Xiao Li, Martin Muschol, Shengqian Ma,and Arash Takshi, The Effect of Surfactant-Free TiO2 Surface Hydroxyl Groups on Physicochemical, Optical, and Self-Cleaning Properties of Developed Coatings on Polycarbonate, Journal of Physics D: Applied Physics 2013, 46 (5), 505316-505326.
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• Tete Tevi, Houman Yaghoubi, Jing Wang, Arash Takshi, Application of Poly (p-Phenylene Oxide) as Blocking Layer to Reduce Self-discharge in Supercapacitors, Journal of Power Sources 2013, 241, 589-596.
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• Houman Yaghoubi*, Zhi Li, Daniel Jun, Rafael Saer, Joanna E. Slota, Martin Beerbom, Rudy Schlaf, John D. Madden, J. Thomas Beatty, and Arash Takshi, The Role of Gold-Adsorbed Photosynthetic Reaction Centers and Redox Mediators in the Charge Transfer and Photocurrent Generation in a Bio-photoelectrochemical Cell,Journal of Physical Chemistry C 2012, 116, 24868-24877.
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• Houman Yaghoubi, Nima Taghavinia, Surface Chemistry of Atmospheric Plasma Modified Polycarbonate Substrates, Applied Surface Science 2011, 257, 9836– 9839.
• Houman Yaghoubi, Nima Taghavinia, Eskandar K. Alamdari, Alex A. Volinsky, Nanomechanical Properties of TiO2 Granular Thin Films, ACS Applied Materials & Interfaces 2010, 2 (9), 2629-2636.
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• Houman Yaghoubi, Nima Taghavinia, Eskandar K. Alamdari, Self-cleaning TiO2 Coating on Polycarbonate: Surface Treatment, Photocatalytic and Nanomechanical Properties, Surface and Coatings Technology 2010, 204 (9-10), 1562-1568 (among top 25 most cited articles in this journal, published since 2008).
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Patents
• Houman Yaghoubi, Arash Takshi, and J. Thomas Beatty, Immobilization of a Target Protein with a Linker Protein for Applications in Bio-hybrid Solar Cells (US Provisional Patent Application 61/889, 743).
Conference Proceedings
• Houman Yaghoubi*, Daniel Jun, J. Thomas Beatty, and Arash Takshi, Photosynthetic Reaction Center Immobilization through Carboxylic Acid Terminated\Cytochrome C Linker for Applications in Photoprotein-Based Bio-Photovoltaic Devices, MRS Online Proceedings Library 2013, 1572, mrss13-1572-ss06-03 doi:10.1557/opl.2013.682, San Francisco, CA.
• Houman Yaghoubi*, Rafael Saer, Daniel Jun, J. Thomas Beatty, and Arash Takshi, Study the Effect of Electrode Material in the Energy Storage Capability of a Protein-Based Solar Cell, NANOSMAT USA 2012, Tampa, FL,.
• Houman Yaghoubi*, Arash Takshi, Daniel Jun, Rafael Saer, John D. Madden, and J. Thomas Beatty, Free-floating Reaction Centers (RCs) Versus Attached Monolayer of RCs in Bio-Photoelectrochemical Cells, MRS Online Proceedings Library 2012, 1414, mrsf11-1414-hh07-03 doi:10.1557/opl.2012.735, Boston, MA.
• Arash Takshi, Houman Yaghoubi, Daniel Jun, Rafael Saer, Ali Mahmoudzadeh, John D. Madden and J. Thomas Beatty, Application of Wide Band Gap Semiconductors to Increase Photocurrent in a Protein Based Photovoltaic Device, MRS Online Proceedings Library 2012, 1414, mrsf11-1414-hh07-01 doi:10.1557/opl.2012.762, Boston. MA.
• Houman Yaghoubi, Nima Taghavinia, Eskandar K. Alamdari, Self-Cleaning Coatings on Al Surface: Surface Treatment, Deposition, Photocatalytic, and Self-Cleaning Properties, Iran International Aluminum Conference 2009 (IIAC2009), Tehran, Iran.
• Houman Yaghoubi, Eskandar K. Alamdari, Nima Taghavinia, and Reza Jafari, Low Temperature Surface Modification of Polymeric Substrates for Improvement of Wet Ability, Hydrophilic Property, and Deposition of Transparent Self-cleaning Coatings, 3rd NanoAfrica 2009 Conference, Pretoria, South Africa.
• Houman Yaghoubi, Nima Taghavinia, Eskandar K. Alamdari, and Reza Jafari, Plasma Treatment of Polymeric Substrates, Preparing Titanium Dioxide coatings and Investigation of Photocatalytic properties, The 9th Conference on Condensed Matter Physics 2009, Ahvaz, Iran.
• Houman Yaghoubi, Nima Taghavinia, Eskandar K. Alamdari, and Reza Jafari, Abrasion Resistant Self-cleaning Coatings for Polymers (Invited), The 6th National technology Conference 2009, Tehran, Iran.