Nanostructured Materials Research Laboratory
        Tiwari's Research Group

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Publications & Patents
        Most Recent Publications (From the University of Utah)

2007
  1. Michael Snure and Ashutosh Tiwari  "Synthesis, Characterization, and Green Luminescence in ZnO Nanocages" Journal of Nanoscience and Nanotechnology  7, 481 (2007).  
  2. Ashutosh Tiwari, Michael Snure, A. Kabidi and D. Kumar  "Room Temperature Ferromagnetism in ZnCuO" manuscript under preparation, to be submitted to Applied  Physics Letters.
  3. Michael Snure and Ashutosh Tiwari "Structural, Electrical, and Optical Characterization of Epitaxial Zn(1-x)Ga(x)O Films grown on Sapphire (0001) Substrate" to be submitted to Journal of Applied Physics.

2006
  1. Ashutosh Tiwari, V.M. Bhosle, S. Ramachandran, N. Sudhakar and J. Narayan “Ferromagnetism in Co doped CeO2-δ: Observation of Giant Magnetic Moment with a High Curie Temperature” Applied Physics Letters 88, 142511 (2006).
  2. Ashutosh Tiwari and J. Narayan “Low-field Giant Magnetoresistance in La0.7Sr0.3MnO3/ZnO Superlattice Structure” Journal of Nanoscience and Nanotechnology 6, 612 (2006).

        Earlier  Publications
2006
  1. J. Narayan and Ashutosh Tiwari “Methods of forming three-dimensional nanodot arrays in a matrix” United States Patent#7,105,118 (September 12, 2006).
  2. V. Bhosle, A. Tiwari and J. Narayan "Metallic conductivity and metal-semiconductor transition in Ga-doped ZnO " APPLIED PHYSICS LETTERS 88, 032106 (2006).
  3. J. Narayan, V. Bhosle, A. Tiwari, A. Gupta, P. Kumar and R. Wu "Methods for processing tantalum films of controlled microstructures and properties"  JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A 24, 1948 (2006). 
  4. V. Bhosle, A. Tiwari, J. Narayan "Electrical properties of transparent and conducting Ga doped ZnO "
    JOURNAL OF APPLIED PHYSICS 100, 033713  (2006). 
  5. S. Ramachandran, A. Chugh, A. Tiwari  and J. Narayan "Growth of highly conducting epitaxial ZnO-Pt-ZnO heterostructure on alpha-Al2O3 (0001)"  JOURNAL OF CRYSTAL GROWTH 291, 212 (2006).
  6. A. Chugh, S. Ramachandran, A. Tiwar, and J. Narayan "Epitaxial ZnO/Pt layered structures and ZnO-Pt nanodot composites on sapphire (0001)"  JOURNAL OF ELECTRONIC MATERIALS 35, 840 (2006). 
  7. J. T. Prater, S. Ramachandran, A. Tiwari and J. Narayan "Co-doped ZnO dilute magnetic semiconductor "
    JOURNAL OF ELECTRONIC MATERIALS 35, 852 (2006).

2005
  1. S.Ramachandran, Ashutosh Tiwari, J.T.Prater and J. Narayan “Epitaxial Growth and Properties of Zn1-xVxO Diluted Magnetic Semiconductor Thin Films” Submitted to Applied Physics Letters 87, 172502, 2005.
  2. V. Bhosle, Ashutosh Tiwari and J. Narayan "Growth of Epitaxial MoOx(2<x<3) Films with Novel Structure and Properties " Journal of Applied Physics 97, 083539, 2005.
  3.  C. Jin, R. Narayan, Ashutosh Tiwari, H. Zhou, A. Kvit and J. Narayan “Epitaxial growth of zinc oxide thin films on silicon” Materials Science & Engineering B 117, 348, 2005.

2004
  1. Narayan and Ashutosh Tiwari “Novel Methods of Forming Self-Assembled Nanostructured Materials: Ni Nanodots in Al2O3 and TiN Matrices“Journal of Nanoscience and Nanotechnology 4, 726, 2004.
  2. Ashutosh Tiwari, J. Narayan, N. Sudhakar and K. P. Rajeev “Growth of epitaxial La1.4Ca1.6Mn2O7 films on SrTiO3 (001)” Solid State Communications 132, 863, 2004.
  3. Ashutosh Tiwari, C. Jin, M. Park and J. Narayan “Electrical transport in ZnO1-: Transition from band-gap insulator to Anderson localized insulator” Journal of Applied Physics 96, 3827, 2004.
  4. S. Ramachandran, Ashutosh Tiwari and J. Narayan “Origin of room-temperature ferromagnetism in cobalt-doped ZnO “ Journal of Electronic Materials 33, 1298, 20004.
  5. S. Ramachandran, Ashutosh Tiwari and J. Narayan “Zn0.9Co0.1O based diluted magnetic semiconducting thin films” Applied Physics Letters 84, 5255, 2004.
  6.  D. Kumar D, S. Yarmolenko, J. Sarkar, J. Narayan, H. Zhou, Ashutosh Tiwari “Pulsed laser deposition assisted novel synthesis of self-assembled magnetic nanoparticles” COMPOSITES PART B-ENGINEERING 35 149, 2004.
2003
  1. D. Kumar, S. J. Pennycook, J. Narayan, H. Wang, Ashutosh Tiwari  “Role of silver addition in the synthesis of high critical current density MgB2 bulk superconductors” Superconductor Science & Technology” 16, 455, 2003
  2. H.Zhou, D. Kumar, Ashutosh Tiwari, J. Narayan “Growth of epitaxial Ni nanodots in TiN” Journal of Applied Physics 94,4841, 2003. 
  3.  A. Chugh, Ashutosh Tiwari, A. Kvit and J. Narayan “A novel technique for making self-encapsulated and self-aligned copper films” Materials Science & Engineering B 103, 45, 2003.
  4.  H. Zhou, D. Kumar, A. Kvit, Ashutosh Tiwari and J Narayan “Epitaxial Growth of Magnetic Nickel Nanodots by Pulsed Laser Deposition” MRS Proceedings 755, DD5.19.1, 2003.
  5.  Ashutosh Tiwari and J. Narayan “Growth of Epitaxial NdNiO3 and Integration with Si(100)“ ECS Proceedings 29, 42, 2003.
  6.  C. Jin, Ashutosh Tiwari, H. Porter, M. Park J Narayan “The Growth and Characterization of Zinc Oxide Thin Film on Fused Silica and SiO2/Si(100) Substrates” MRS Proceedings 744, M5.6.1, 2003.
  7. Ashutosh Tiwai, C. Jin, D. Kumar and J. Narayan “Rectifying electrical characteristics of ZnO/La0.7Ca0.3MnO3 heterostructure ” Applied Physics Letters 83, 1773, 2003.
  8. R. J. Narayan, H. Wang and Ashutosh Tiwari “Nanostructured DLC-Ag Composites for Biomedical Applications” MRS Proceedings  750, Y5.9.1, 2003.
  9.  H. wang, Ashutosh Tiwari, A. Chug, J. Narayan “TaN-TiN binary alloys and superlattices as diffusion barriers for copper interconnects” Journal of Electronic Materials 32, 994, 2003.
  10.  H. Wang, A. Gupta, Ashutosh Tiwari, X. Zhang and J. Narayan “Growth and Characterization of Tan/TiN Superlattice Structure” Applied Physics Letters 83, 3072, 2003.
  11. H. Wang, Ashutosh Tiwari, X.Zhang, A.Kvit and J Narayan“Copper Diffusion Characteristics in Single Crystal and Polycrystalline TaN” MRS Proceedings 745, N6.11.1, 2003.

2002 and earlier
  1. D. Kumar, S. J. Pennycook, A. Lupini, G. Duscher, Ashutosh Tiwari and J. Narayan “Synthesis and atomic-level characterization of Ni nanoparticles in Al2O3 matrix” Applied Physics Letters 81, 4204, 2002.
  2. Ashutosh Tiwari, C. Jin, A. Kvit, D. Kumar, J. F. Muth, J. Narayan “Structural, optical and magnetic properties of diluted magnetic semiconducting Zn1-xMnxO films” Solid State Communications 121, 371, 2002.
  3.  Ashutosh Tiwari, M. Park, C. Jin, D. Kumar and J. Narayan “ Epitaxial growth of ZnO films on Si(111)” J. Mater. Res. 17, 2480, 2002.
  4.  Ashutosh Tiwari, J. Narayan, C. Jin and A. Kvit “ Growth of Epitaxial NdNiO3 and Integration with Si(100)”  Applied physics letters, 80, 1337, 2002.
  5. C. Jin, Ashutosh Tiwari, A. Kvit, D. Kumar, J. Muth,  and J Narayan “Pulsed Laser Deposition and Characterization of Zn1-xMnxO Films” MRS Proceedings 692, H11.5.1, 2002.
  6.  Ashutosh Tiwari, C. Jin and J. Narayan “Stress induced tuning of metal-insulator transition in NdNiO3 films”  Applied Physics Letters, 80, 4039, 2002.
  7.  Ashutosh Tiwari, K. P. Rajeev and J. Narayan "Low temperature electrical transport in                   La1-xNdXNiO3” Solid State Communications 121, 357, 2002.
  8.  A. Chugh, Ashutosh Tiwari, A. Kvit and J Narayan “Self-aligned passivated copper interconnects: A novel technique for making interconnections in Ultra Large Scale Integration device applications” MRS Proceedings 716, B8.1.1, 2002. 
  9.  Ashutosh Tiwari, A. Chugh, C. Jin, D. Kumar and J. Narayan “Integration of single crystal La0.7Sr0.3MnO3 films with Si(001)” Solid State Communications  121, 679, 2002.
  10. H. Wang, Ashutosh Tiwari, X. Zhang, A. Kvit and J Narayan “Single Crystal TaN Thin Films on TiN/Si Heterostructure” MRS Proceedings 716, B8.8.1, 2002.
  11.  H. Wang, Ashutosh Tiwari, A. Kvit, X. Zhang and J. Narayan “ Epitaxial growth of TaN films on Si(100) and (111)” Applied physics letters 80, 2323, 2002.
  12. Ashutosh Tiwari, H. Wang, D. Kumar, J. Narayan “ Weak-localization effect in single crystal TaN(001) films” MOD PHYS LETT B 16,1143,2002.
  13. C. Jin, Ashutosh Tiwari, A. Kvit  and J Narayan “Growth of epitaxial ZnO films on Si(111)” MRS Proceedings 722, K10.7.1, 2002. 
  14.  H. Wang, Ashutosh Tiwari, X. Zhang, A. Kvit, J. Narayan “Copper diffusion characteristics in single-crystal and polycrystalline TaN” Applied Physics Letters, 81, 1453, 2002.
  15.  M. Larson, Ashutosh Tiwari, M. Mohazzab, V. Dostenko, J. Panek, Al Nash and Norbert Mulders, ”EXperiments Along Coexistence near Tricriticality”  NASA Document D-215222, 2000. 
  16.  Ashutosh Tiwari and K. P. Rajeev “ Effect of oxygen stoichiometry on the electrical resistivity behaviour of NdNiO3-δ” Solid State Communications 109, 119, 1999. 
  17.  Ashutosh Tiwari and K. P. Rajeev “Electrical transport in LaNiO3-” Journal of Physics:Condensed Matter 11, 3291,1999.
  18. Ashutosh Tiwari and K. P. Rajeev ” Metal-insulator transition in NdNi1-xFexO3-” Solid State Communications,110, 109, 1999. 
  19.  Ashutosh Tiwari and K. P. Rajeev “ Electron tunneling experiments on La0.7A0.3MnO3 (A=Ca, Sr, Ba)” Physical Review B 60, 10591, 1999.
  20. Ashutosh Tiwari and K. P. Rajeev “ Low-temperature electrical transport in La0.7A0.3MnO3 (A=Ca, Sr, Ba)” Solid State Communications 111, 33, 1999.
  21.  Ashutosh Tiwari “ Local environment of Fe in NdFe1-xNixO3-δ perovskite oxides” Journal of Alloys and Compounds 274, 42, 1998. 
  22. Ashutosh Tiwari and K. P. Rajeev “Anomalous thermoelectric power of sol-gel prepared NdNiO3-” Modern Physics Letters B, 11, 1161 1997. 
  23.  Ashutosh Tiwari, K. P. Rajeev “Metal-insulator transition in NdNiO3 ? “ Solid State Physics (India), 41C, 1997.
  24.  Ashutosh Tiwari and K. P. Rajeev “ Metal-insulator transition in La0.7Sr0.3Mn1-xFexO3” Journal of Applied Physics 86, 5175, 1999. 
  25.  Ashutosh Tiwari and K. P. Rajeev “Preparation of nanocrystalline ferromagnetic LaMnO3+ δ and the study of the effect of changing oxygen stoichiometry on its magnetic properties” Journal of Materials Science Letters 16, 521, 1997.
  26.  Ashutosh Tiwari, K. P. Rajeev, A. K. Majumdar “Thermoelectric properties of Ni-Fe-V alloys” Solid State Physics (India), 39C, 1996. 
  27.  Ashutosh Tiwari , K. P. Rajeev “A simple automated Curie temperature device” Solid State Physics (India), 40C, 1996 .
  28. Ashutosh Tiwari, K. P. Rajeev, R. N. Panda, N. S. Gajbhiye “Preparation and TEP measurement of nanocrystalline LaNiO3”  Solid State Physics (India), 38C, 1995.