• Associate Professor, Chemical Engineering
Sreeram Vaddiraju image

Educational Background

  • Ph.D., University of Louisville - 2006
  • M.S., University of Louisiana - 2002
  • B. Tech., Andhra University, India - 2000

Research Interests

  • The overall vision of Dr. Vaddiraju's research work is the development of processes for the mass production of nanowires and their integration in a simple, reliable and scalable manner into highly efficient energy conversion/mechanical devices. Currently, a bulk of his research work is primarily geared towards the fabrication of highly efficient thermoelectrics, solar cells, photocatalytic systems that employ semiconductor nanowires as the primary component. He is also interested in designing, engineering and fabricating ‘smart’ mechanical devices from nanowire-based composites. 

    Towards realizing his research vision of streamlining the production of nanowire-based energy conversion devices in a manner similar to that achieved with drug production by the pharmaceutical industry and integrated chip (IC) production by the electronics industry, he has achieved the following so far: accomplished the mass production of nanowires and their large-scale assembly in an interface-engineered manner into energy conversion devices; accomplished both the interface-engineered assembly of nanowires via welding, and the simultaneous consolidation and alignment of nanowires using equal channel angular extrusion (ECAE); demonstrated that it is possible to translate novel electrical and thermal transport properties exhibited of individual nanowires in large-scale nanowire assemblies (achieved a thermoelectric figure-of-merit value of 0.23 in bulk pellets composed of copper doped Zn3P2 nanowires, the highest reported for the Zn3P2 system, and 100 folds higher than its bulk counterpart; demonstrated a thermoelectric figure-of- merit value of 0.6 in Al and Ga dually doped ZnO nanowire bulk pellets, highest achieved so far in the in the ZnO material system).

    He also recently demonstrated that these nanowire systems could be used to disinfect water of harmful bacteria (e.g., E.coli) in a rapid and inexpensive manner. Currently, he is developing photocatalytic processes for efficiently disinfecting large quantities of water (millions of gallons of water per day).

Awards & Honors

  • Outstanding service Award, 2019
  • Phillips 66 First Year Faculty Fellowship, 2016
  • Fluor Distinguished Teaching Award, 2014

Selected Publications

  • C. Miskin, S. Deshmukh, V. Vasiraju, K. Bock, G. Mittal, A. Dubois-Camacho, S. Vaddiraju, R. Agrawal, ‘Room temperature one-step synthesis of lead chalcogenide nanoparticles and size-controlled self-assemblies in an organic thiol-amine system’, ACS Applied Nano Materials, 2(3), 1242-1252, 2019.
  • P. Kannan, S. Su, H. Castaneda-Lopez, M. S. Mannan, S. Vaddiraju, ‘A review of characterization and quantification tools for microbiologically influenced corrosion in the oil and gas industry: Current and future trends’, Industrial & Engineering Chemistry Research, 57, 13895-13922, 2018.
  • Y. Chen, R. Polinnaya, S. Vaddiraju, ‘Byproduct-free Mass Production of Compound Semiconductor Nanowires: Zinc Phosphide’, Materials Research Express, 5, 055042, 2018.
  • V. Vasiraju, D. Norris, S. Vaddiraju, ‘Thermal Transport through Zn3P2 Nanowire-BN Microparticle/Nanoparticle Composites and Hybrids’, Materials Research Express, 4(7), 075041, 2017.
  • A. Ali, Y. Chen, V. Vasiraju, S. Vaddiraju, ‘Nanowire-based Thermoelectrics (Invited Topical Review)’, Nanotechnology, 28(28), 282001, 2017.
  • H. Li, Y. H. Yu, V. Vasiraju, S. Vaddiraju, Z. Cheng, ‘Investigation of Electron Transport Through Alkanedithoil of Functionalized Zn3P2 Nanowires for Hydrogen Production’, International Journal of Nano Studies & Technology, S1:001, 1-5, 2016.
  • A. Nie, L-Y Gan, Y. Cheng, X. Tao, Y. Yuan, S. Sharifi-Asl, K. He, H. Asayesh-Ardakani, V. Vasiraju, J. Lu, F. Mashayek, R. Klie, S. Vaddiraju, U. Schwingenschlögl, R. Shahbazian-Yassar, ‘Ultrafast and Highly Reversible Sodium Storage in Zinc-Antimony Intermetallic Nanomaterials’, Advanced Functional Materials, 26, 543-552, 2016.
  • V. Vasiraju, L. Brockway, S. Balachandran, A. Srinivasa, S. Vaddiraju, ‘Shear Induced Simultaneous Consolidation and Alignment of Silicon Nanowires into Ingots using Equal Channel Angular Extrusion (ECAE)’, Materials Research Express, 2(1), 015013, 2015.
  • G. Ramos-Sanchez, M. Albornoz, Y-H. Yu, Z. Cheng, V. Vasiraju, S. Vaddiraju, F. El Mellouhi, P. B. Balbuena, ‘Organic molecule functionalized Zn3P2 nanowires for photochemical water splitting and H2 production: DFT and Experimental Analyses’, International Journal of Hydrogen Energy, 39(35), 19887–19898, 2014.
  • A. Nie, Y. Cheng, Y. Zhu, H. Asayesh-Ardakani, R. Tao, F. Mashayek, Y. Han, U. Schwingenschlögl, R. F. Klie, S. Vaddiraju, R. Shahbazian-Yassar, ‘Lithiation-induced shuffling of atomic stacks’, Nano Letters, 14(9), 5301-5307, 2014.
  • L. Brockway, V. Vasiraju, M. K. Sunkara, S. Vaddiraju, ‘Engineering efficient thermoelectrics from large-scale assemblies of doped ZnO nanowires: Nanoscale effects and resonant-level scattering’, ACS Applied Materials & Interfaces, 6(17), 14923-14930, 2014.
  • V. Vasiraju, Y. Kang, S. Vaddiraju, ‘Non-conformal decoration of semiconductor nanowire surfaces with boron nitride (BN) molecules for stability enhancement: Degradation-resistant Zn3P2, ZnO and Mg2Si nanowires’, Physical Chemistry Chemical Physics, 16 (30), 16150-16157, 2014.
  • Y. Kang, S. Vaddiraju, ‘Solid-state phase transformation as a route for the simultaneous synthesis and welding of single-crystalline Mg2Si Nanowires’, Chemistry of Materials, 26, 2814, 2014.
  • L. Brockway, V. Vasiraju, S. Vaddiraju, ‘Compositional disorder and its effect on the thermoelectric performance of Zn3P2 nanowire-copper nanoparticle composites, Nanotechnology, 25, 125402, 2014.
  • L. Brockway, V. Vasiraju, H. Asayesh-Ardakani, R. Shahbazian-Yassar, S. Vaddiraju, ‘Thermoelectric properties of bulk Zn3P2 nanowire assemblies’, Nanotechnology, 25, 145401, 2014.
  • L. Brockway, M. Van Laer, Y. Kang, S. Vaddiraju, ‘Large-scale synthesis and in situ functionalization of Zn3P2 and Zn4Sb3 nanowire powders’, Physical Chemistry Chemical Physics, 15, 6260-6267, 2013.
  • Y. Kang, L. Brockway, S. Vaddiraju, ‘A simple phase transformation strategy for converting silicon nanowires into metal silicide nanowires: Magnesium silicide’, Materials letters, 100, 106-110, 2013.
  • L. Brockway, C. Pendyala, J. Jasinski, M. K. Sunkara, S. Vaddiraju, ‘A postsynthesis decomposition strategy for group III–nitride quantum wires’, Crystal Growth & Design, 11(10), 4559-4564, 2011.
  • M. E. Alf, A. Asatekin, M. C. Barr, S. H. Baxamusa, H. Chelawat, G. Ozaydin-Ince, C. D. Petruczok, R. Sreenivasan, W. E. Tenhaeff, N. J. Trujillo, S. Vaddiraju, J. Xu, Karen K. Gleason, ‘Chemical vapor deposition of conformal, functional, and responsive polymer films’, Advanced Functional Materials, 22, 1993-2027, 2010.
  • Chelawat, S. Vaddiraju, K. K. Gleason, ‘Conformal, conducting poly(3,4-ethylenedioxythiophene) thin films deposited using bromine as the oxidant in a completely dry oxidative chemical vapor deposition process’, Chemistry of Materials, 22, 2864, 2010.
  • S. Vaddiraju, K. K. Gleason, ‘Selective sensing of volatile organic compounds using novel conducting polymer-metal nanoparticle hybrids’, Nanotechnology, 21, 125503, 2010.
  • C. Pendyala, S. Vaddiraju, J. H. Kim, J. Jacinski, Z. Q. Chen, M. K. Sunkara, ‘Self-nucleation and growth of group III-antimonide nanowires’, Semiconductor Science and technology, 25, 024014, 2010.
  • S. Vaddiraju, H. Cebeci, Karen K. Gleason, Brian L. Wardle, ‘Hierarchical multifunctional composites by conformally coating aligned carbon nanotube arrays with conducting polymer’, ACS Applied Materials and Interfaces, 1, 2565, 2009
  • J. Thangala, S. Vaddiraju, S. Malhotra, V. Chakrapani, M. K. Sunkara, ‘A hot-wire chemical vapor deposition (HWCVD) method for metal oxide and their alloy nanowire arrays’, Thin Solid Films, 517, 3600, 2009.
  • S. Vaddiraju, K. Senecal, Karen K. Gleason, ‘Novel strategies for the deposition of -COOH conducting copolymer films and assembling inorganic nanoparticles on conducting polymer platforms’, Advanced Functional Materials, 18, 1929, 2008.
  • S. Vaddiraju, M. K. Sunkara, A. H. Chin, C. Z. Ning, G. R. Dholakia, M. Meyyappan, ‘Synthesis of group III-antimonide nanowires’, Journal of Physical Chemistry C, 111(20), 7339, 2007.