BIRTHPLACE:
Chianghsi, China; U.S. Citizen

EDUCATION:
B.S. Physics Department, Nanjing University, 1964, China,
Ph.D. Institute of Physics, Chinese Academy of Sciences, 1968, China.

PROFESSIONAL EXPERIENCE:
May.1989-now Research Professor and Senior Scientist at Space Vacuum Epitaxy Center, University of Houston
Aug. 1988- May. 1989 Scientist at Ams Laboratory and department of Chemistry, Iowa State University
1985-1990 Associate Professor of Physics at Institute of Physics, Chinese Academy of Sciences
1980-July 1982 and Aug.-Dec. 1984 Visiting Scientist at Department of Physics, University of Houston
1968-1984 Assistant Professor and Research Associate at Institute of Physics, Chinese Academy of Sciences

UNITED STATES PATENT:
1) Inventors: He Lin, Alex Ignatiev, Nai Juan Wu
Title: " Three-terminal non-volatile ferroelectric/superconductor thin film field effect transistor"
Patent Number: 5,686,745
Date of patent: Nov. 11, 1997

2) Inventors: Alex Ignatiev, Naijuan Wu
Title: "Treating retinal damage by implantion thin film optical detectors"
Patent Number: 5873901
Date of patent: February 13, 1998

3) Inventors: Yansong Chen, ShangQing Liu, Alex Ignatiev, Naijuan Wu
Title: "Birefringent grating polarizing beam splitter"
Has been allowed by the US Patent Office

Referred Publications :

96. X. Chen, N. J. Wu, and A. Ignatiev, "Structure and conducting properties of La1-xSrxCoO3-d films," Journal of the European Ceramic Society, 19 (6-7) (1999) 819.

95. A. R. Zomorrodian, N. J. Wu, H. Lin, A. Ignatiev, "The role of as-grown defects and electrode materials on polarization orientation of Pb(Zr0.52 Ti0.48)O3(PZT) on YBa2Cu3O7-x(YBCO)," Thin Solid Films, 335, 225 (1998).

94. N. J. Wu, A. Ignatiev, Y.Q. Xu, Y.S. Chen, "(Mn,Sb) doping-Pb(Zr,Ti)O3/YBa2Cu3O7 heterostructure infrared detectors," Integrated Ferroelectrics, 22, (1998) 489.

93. W. W. .Zhuang, N. J. Wu, D. Ritums, Y. M. Chen and A. Ignatiev, "The Integration of Ba0.5Sr0.5TiO3 with silicon by the use of metallic buffers," Integarted of Ferroelectrics, 21 (1998) 167.

92. Y. S. Chen, N. J. Wu, A Ignatiev, " Dependence of infrared photoresponse of pyroelectric thin film detector with respect to chopper frequency," (invited), International Journal of Modern Physics, B12, No. 29-31 (1998), 3365-3368.

91. N. J. Wu, A. Ignatiev, Y.S. Chen, "Perovskite oxide thin film heterostructures for IR detector," (invited), International Journal of Modern Physics, B12, No. 29-31 (1998), 3381-3384.

90. A. Ignatiev, Y. Q. Xu, N. J. Wu, D. Liu, "Pyroelectric, ferroelectric and dielectric properties of Mn and Sb-doped PZT thin films for uncooled IR detectrors," (invited) Material Science & Engineering B56, (1998) 191-194. Proc.

89. Y. Q. Xu, N.J. Wu, D. Liu and A. Ignatiev, "(Mn,Sb) doped-PZT/YBa2Cu3O7-x heterostructure for IR detector array,", Mat. Res. Soc. Proc. Vol. 493, 481 (1998).

88. D.L. Ritums, N.J. Wu, X. Chen, A. Ignatiev, "Conducting and interfiacial properties of epitaxial SVO films," Proc. of Space Techchnology & Applications Intl. Forum (STAIF-98), January 25-29, 1998, Albuquerque, NM., P. 672, 1998.

87. X. Chen, N. J. Wu, D.L.Ritums, A. Ignatiev, "Pulsed laser deposition of conducting porous La-Sr-Co-O films," Thin Solid Films, 342 (1-2), (1999) 61.

86. S. Q. Liu, Y. S. Chen, S.H. Zheng, D.H. Li, R.X. Wang, N.J. Wu, and A. Ignatiev, "Achromatic birefringent grating polarizer," Journal of Modern Optics, 45, 335-341 (1998).

85. Y.Q. Xu, N.J. Wu, D. Liu and A. Ignatiev, "(Mn,Sb) doped-PZT/YBa2Cu3)7-x heterostructure for IR detector array," Material Research Soc. Proc., 493 (1998) 481.

84. S. Q. Liu, Y. S. Chen, N.J. Wu, and A. Ignatiev, "Realization of a new polarizer employing the combined effect of birefringence and diffraction," Optics Letters, 22 (1997) 1518.

83. N.J. Wu, Y. S. Chen, S. Dordevic, A. Ignatiev, "Pyroelectric IR sensor based on oxide heterostructures on Si(100) and LaAlO3(100) substrates," (invited), SPIE, 3175 (1997) 256.

82. N. J. Wu, Y. S. Chen, J. Y. Fan, A. Ignatiev, "Infrared photoresponse study of (Sb,Mn)doped-Pb(Zr,Ti)O3/Yba2Cu3O7 heterostructure," J. Appl. Phys., 83, (1998) 4980.

81. Y. S. Chen, N. J. Wu, D. Liu, J. Fan, S. Dordevic and A. Ignatiev, "Uncooled infrared detectors for space monitoring applications," Proc. of Space Techchnology & Applications Intl. Forum (STAIF-97), Jan., 1997, Albuquerque, NM., pp. 813-818.

80. W. W. Zhuang, L. M. Liu, N. J. Wu, Z. D. Hao, D. M. Hoffman, A. Ignatiev, A. J. Jacobson and S. S. Perry, "Synthesis of ferroelectric strontium bismuth tantalate films from metal alkoxide precursors," submitted to Proc. of the Material research Society 1996 fall meeting, Solid-State Chemistry of Inorganic Materials Symp., Boston, MI, Dec. 1-6,1996, p. 513.

79. D. L. Ritums, D. Liu, N. J. Wu, A. Ignatiev, "Epitaxially deposited SrVO3 conducting films by laser ablation and MOCVD," Proc. of 10th IEEE Intl. Symp. On the Appl. Ferroelectrics, East Brunswick, NJ, Aug.,18-21, 1996. Editors: B.M. Kulwicki, A.Amin, and A. Safari, p. 417.

78. N.J. Wu, H. Lin, A.R. Zomorrodian, D. Liu, A. Ignatiev, "High temperature retention properties of ferroelectric PZT/YBCO heterostructures investigated by pyroelectric current and phase detection," Proc. of 10th IEEE Intl. Symp. on the Appl. Ferroelectrics, East Brunswick, NJ, Aug.,18-21, 1996, Editors: B.M. Kulwicki, A.Amin, and A. Safari, p. 507.

77. N. J. Wu, D. Liu, Y.S. Chen, H. Lin, A.R. Zomorrodian, A. Ignatiev, "Infrared photocurrent study of PZT/YBCO and PMSZT/YBCO heterostructure (invited)", Infrared Detectors and Focal Plane Arrays IV,.1996, SPIE-Vol. 2746, PP. 172-177.

76. N. J. Wu, H. Lin, T. Q. Hung, S. Endicter, D. Liu, A. Ignatiev, " Study of ferroelectric-superconductor field effect transistor (invited)", Proc. of Oxide Superconductor Physics and Nano-engineering II, SPIE's Photonics West '96, Symp., 27 Jan.-2 Feb., 1996, San Jose, CA., SPIE, vol. 2697, p.502

75. H. Lin, N. J. Wu, A. Ignatiev, "A ferroelectric-superconducting Photodetector," J. Appl. Phys., 80, (1996) 7310.

74. A.R. Zomorrodian, H. Lin, N. J. Wu, T. Q. Huang, D. Liu and A. Ignatiev, "High temperature polarization retention of a PZT/YBCO memory cell," Appl. Phys. Lett. 69, (1996) 1789.

73. H. Lin, A.R. Zomorrodian, N. J. Wu, T. Q. Huang, D. Liu, X.Y. Li and A. Ignatiev, "Pyroelectric current method for measuring ferroelectric memory cell retention at high temperature," Integrated Ferroelectrics, 12 (1996) 47.

72. N. J. Wu, X. Y. Li, J. Li, H. Lin, H. Fredricksen, K. Xie, A. Ignatiev and H. D. Shih, "Thin film growth and interface characterization of YBCO on LiNbO3 substrate", J. Mater. Res., 10, 3009, 1995.

71. H. Fredricksen, D. Ritums, N. J. Wu, X. Y. Li, J. Willis, A. Ignatiev, J. Feller, B.K. Sarma and M. Levy, "Design dependent transistion behavior for superconducting transducers and reflectors," Proc. of 1995 IEEE Ultrasonics Symp., Nov. 7-10, Seattle Washington, Vol.1, PP. 555-558.

70. A. Zomorrodian, N. J. Wu, H. Lin, T. Q. Huang, X. Y. Li and A. Ignatiev, "Temperature dependence of infrared photocurrent in Pb(Zr0.52Ti0.48)O3," J. Appl. Phys. 76 (1995), 4780.

69. A. Ignatiev, N. J. Wu, H. Lin, T. Q. Hung and X. Y. Li, "Non-volatile ferroelectric-superconducting field effect transistor," Integrated Ferroelectrics, 10 (1995), 327.

68. A. Zomorrodian, A. Mesarwi, N. J. Wu and A. Ignatiev, "XPS oxygen line broadening in lead zirconium titanate and related materials," Appl. Surf. Sci., 90 (1995), 343.

67. X. Y. Li, N. J. Wu, K. Xie, J. S. Liu, H. Lin, T. Q. Hung and A. Ignatiev, "The effect of YBa2Cu3O7-x target on superconductive properties of laser ablation deposited thin films," Phys. C248 (1995) 281.

66. H. Lin, N. J. Wu, F. Geiger, K. Xie, A. Ignatiev, "Photoresponse and fast optical read-out for a PbZrxTi1-xO3/YBa2Cu3O7-x thin film heterostructure capacitor", Appl. Phys. Lett., 66, (1995),1172.

65. N. J. Wu, H. Lin, K. Xie, X. Y. Li, A. Ignatiev, "A comparison study of (100) and (110) Ba0.5Sr0.5TiO3 epitaxial thin films grown on superconducting YBa2Cu3O7-x Thin Film substrates", Phys. C 232, (1994), 151.

64. H. Fredricksen, D. Ritums, N. J. Wu, X. Y. Li, A. Ignatiev, "High transition temperature superconducting surface acoustic wave devices," Appl. Phys. Lett. 64 (1994), 3033.

63. He Lin, N. J. Wu, K. Xie, X. Y. Li, A. Ignatiev, "The transient behavior and memory effect of a PZT/YBCO three terminal Device," Appl. Phys. Lett. 65 (8), (1994), 953.

62. N. J. Wu, H. Lin, K. Xie, A. Ignatiev, "PZT/YBCO integration and characterization of a three terminal device," Ferroelectrics, 156 (1994), 73.

61. N. J. Wu, H. Lin, K. Xie, X. Y. Li, J. Li, A. Ignatiev, "Study of Ba1-xSrxTiO3 (100) epitaxial thin films prepared by laser deposition", Proc. of the 9th IEEE Intl. Symp. on the Applications of Ferroelectrics, 7-10 Aug. 1994, University Park, Pennsylvania, P. 464.

60. J. Feller, M. levy, B. K. Sarma, H. Fredricksen, D. Ritums, N. J. Wu, X. Y. Li, A ignatiev, "High Tc SAW devices and measurements near the superconducting transition", Proc. of IEEE Intl. Ultrasonics Symp., Nov. 1-4, 1994, Cannes, France, QQ-2.

59. H. Lin, N. J. Wu, K. Xie, X. Y. Li, A. Ignatiev, "Ferroelectric switching and fatigue behavior for PZT/YBCO thin film heterostructures", Integrated Ferroelectrics 5, (1994), 197.

58. N. J. Wu, A. Ignatiev, A. Meswari, "Growth of PZT thin films on Yttrium-treated Si(100)", Integrated Ferroelectrics, 3 (1993), 139.

57. N. J. Wu, A. Ignatiev, A. Meswari, H. D. Shih, "Heterostructures of Pb(ZrxTi1-x)O and YBa2Cu3O7-x on MgO substrates prepared by Pulsed Laser Ablation", Jpn. J. Appl. Phys. 32 (1993), 5019.

56. W. -D. Wang, N. J. Wu, P. A. Thiel, M. C. Triugides, "A new model for the (7x7) structure of oxygen on Ni(100)", Surf. Sci. 282 (1993), 229.

55. A. Meswari, N. J. Wu, H. Fredricksen, A. Ignatiev, "Thin barrier technology for the integration of YBa2Cu3O7-x thin films to semiconductors", MRS Symp. Proc. Layered Superconductors: Fabrication, Properties and Applications, San Francisco, California, April 28-May 1, 1992, vol.275, P.801.

54. N. J. Wu, A. Ignatiev, M. Hartig, A. Meswari, H. D. Shih, "Growth and characterization of Pb(Zr,Ti)O3 thin films on Si(100) and on Yttrium-treated Si(100)", Proc. of the Fourth Intl. Symp. on Integrated Ferroelectrics, Monterey, California, March 9-11, 1992, P.392.

53. W. C. Fan, N. J. Wu, A. Ignatiev, "Determination of Bi-induced (1x1) reconstruction of the Si(100) surface", Phys. Rev. B45 (1992), 14167.

52. T. Robin, A. Meswari, N. J. Wu, W. C. Fan, R. Sega, A. Ignatiev, "YBa2Cu3O6+X growth on Y-enhanced SiO2 /Si(100) substrates", Appl. Phys. Lett. 59 (1991), 2323.

51. N. J. Wu, Z. P. Hu, A. Ignatiev, "Orientational ordering of a cesium monolayer on graphite", Phys. Rev. B43 (1991), 3805.

50. W. C. Fan, N. J. Wu, A. Ignatiev, "Growth of bismuth on the Si(100) surface: AES and LEED study", Surf. Sci. 235 (1990), 169.

49. W. C. Fan, N. J. Wu, A. Ignatiev, "Observation of ordered structures of Sr on the Si(100) surface", Phys. Rev. B42 (1990), 254.

48. W. -D. Wang, N. J. Wu, P. A. Thiel, "Structural steps to the oxidation of Ni(100)", J. Chem. Phys. 92 (1990), 2025.

47. K. Xie, S. X. Qi, N. J. Wu, Z. D. Lin, "Photoemission studies on the blue tungsten oxides", Acta. Phys. Sin., 39 (1990), 809; English in Chin. J. Phys. (U.S.A.). 46. W. -D. Wang, N. J. Wu, P. A. Thiel, "Structural steps to oxidation of Ni(100)", J. Chem. Phys., (1990).

45. Z. P. Hu, Jia Li, N. J. Wu, A. Ignatiev, "Surface structure of the C(0001)-(2x2)Cs system: Low-energy electron-diffraction dynamical calculation", Phys. Rev. B39(1989), 13201.

44. Z. P. Hu, Jia Li, N. J. Wu, A. Ignatiev, "C(0001)-( 3x 3)R30 -Cs structure determination: R-factor analysis", Surf. Sci., 218 (1989), 283.

43. W. -D. Wang, N. J. Wu, S. -L. Chang, P. A. THiel, "Structural steps in oxidation of metal surfaces: (100) face of Pd and Ni", Proc. Symp. on Chemically- Modified Oxide Surfaces, Midland, MI, June 1989, Gordonand Breach.

42. J. M. Cao, N. J. Wu, S. G. Qi, K. A. Feng, M. S. Zei, "Chemisorption of oxygen on Au(111 ) surface", Chin. Phys. Lett. 6 (1989), 92.

41. Z. P. Hu, Li Jia, N. J. Wu, "Dynamical low energy electron diffraction analysis for Cs/graphite (0001)-( 3x 3) surface", Chin. Phys. Lett. 6 (1989), 20.

40. Z. X. Liu, K. Xie , N. J. Wu, D. H. Shen, Z. D. Lin, "Double peak structure of O1s in photo emission spectra of Bi-Sr-Ca-Cu-O high-Tc superconductors", Chin. Phys. Lett. 6 (1989), 261.

39. Z. X. Liu, D. H. Shen, K. Xie, S. X. Qi, H. W. Xu, N. J. Wu, "Electronic structure studies of Bi-Sr-Ca-Cu-O single crystal superconductor", Proc. of intl. Symp. on the Electronic Structure of High Tc Superconductors, Rome, Italy, 5-7 Oct., 1988, (Oxford, UK:pergamon, 1989), p 237-42.

38. Z. X. liu, N. J. Wu etal., "Mechanism for promoting the evolution of lattice oxygen by the interaction between Vanadia Titania", J. Catal., 113 (1988), 45.

37. D. W. Hu, N. J. Wu etal., "Effect of oxygen on the valence band structure of high Tc superconductor Ba2YCu3O7-x", Proc. of Sino-U. S. Joint Symp. on Vacuum and Surface (VASA-87), ed. Hua Zhong-Yi, World Science, Beijing, Vol.2, 1987, P.109.

36. D. W. Hu, N. J. Wu etal., "A study of photoelectron spectroscopy of superconductor Ba2YCu3O7-x by Vacuum annealing", Science Bulletin No.14 (1988), 1061.

35. N. J. Wu, D. W. Hu etal., "Photoemission spectroscopy of high Tc superconductor Ba1-xYxCuO3-y with x changed", Science Bulletin, No. 14 (1988), 1057.

34. D. H. Shen, N. J. Wu, Z. X. Zhao etal., "Vacuum annealing and XPS observation on the high Tc superconductivity of BiCaSrCuO system", Modern Physics Lett., B2 (1988).

33. N. J. Wu, "The photoemission studies of high Tc superconductor", book "Collected Reports on the Properties of Oxide Superconducting Materials", The Press of Peking University, P.121 (1988).

32. N. J. Wu, K. Xie, Z. X. Zhao etal., "Photoemission studies of high-Tc superconductor Ba2Y1-xPrxCu3O7+x", Solid State Comm., 69 (1989), 615.

31. Hu Zi-Pu, Li Jia, Wu Naijuan, "The Cs/C(0001)-(2x2) surface structure analysis by LEED dynamical calculation", Acta. Phys. Sin. 37 (1988), 2068; English in: Chin. J. Phys. (U. S. A).

30. Y. J. Hu, Z. D. Lin, K. Xie, N .J. Wu, "Work function and electronic structure of Co overlayers on the ion sputtered basal face of MoS2 single crystal", Chinese Phys. Lett., (1988), 169.

29. K. A. Feng, N. J. Wu, L. H. Zhao, "Structural phase transitions in krypton monolayers adsorbed on graphite", Phys. Lett., A128 (1988), 444.

28. K. A. Feng, L. Huang, N. J. Wu, L. H. Zhao, "The effect of temperature on the substrate potential of an adsorption system", Phys. Lett., A129 (1988), 470.

27. N. J. Wu, K. Xie etal., "XPS study of surface nitrogen on PET acted by low temperature plasma and low energy ions", Acta Physica sinica, 37 (1988).

26. N. J. Wu, J. F. Hu etal., "ESCA studies of surface modification of polymer by plasma treatment and graft copolymerization", Synthetic Chemical Fiber, 4 (1987), 8.

25. Z. H. Zhu, L. H. Zhao, N. J. Wu, K. A. Feng, "Two-dimensional atomic correlation of stepped surfaces", J. Vac. Sci. Technol. (Chin.), 5 (1987), 281.

24. L. H. Zhao, E. H. Luo, N. J. Wu, K. A. Feng, "Quantitative evaluation of island size distributions in chemisorption", Chin. Phys. Lett., 4 (1987), 509.

23. L. H. Zhao, N. J. Wu, K. A. Feng, "Structural Phase trasitions in chemisorbed overlayers", Physics, No.5, (1987).

22. Z. X. Liu, N. J. Wu etal., "The interaction studies of V2O5 supported on TiO2 surface by XPS", Proc. Asia Pacific Symposium on Surface Physics, ed. Xie Xide, World Scientific, 1987, P. 458.

21. J. F. Hu, N. J. Wu etal., "Studies of surface modification of polymers by low temperature plasma", The Proc. of International Conference on the Science and Technology of Plasma, P.525, 1986, Beijing.

20. M. Y. Hong, J. F. Hu, N. J. Wu etal., "Surface modification of polythylene terephthalate by plasma", Physics, 15 (1986), 578.

19. L. H. Zhao, K. A. Feng, N. J. Wu, "Renormalization group study of order-disorder transition in the W(112)-P(2x1)-O system", Acta. Phys. Sinica, 35 (1986), 104.

18. Z. P. Hu, N. J. Wu, A. Ignatiev, "Cs induced work function changes on the graphite (0001) surface", Surf. Sci., 177 (1986), 1956.

17. Z. P. Hu, N. J. Wu, A. Ignatiev, "Cesium adsorption on graphite (0001) surface: the phase diagram", Phys. Rev. B33 (1986), 7683.

16. K. A. Feng, N. J. Wu, L. H. Zhao, "A study of incommensurate structure on Mo(100) surface by domain modulation model", Chin. Phys. Lett., 3 (1986), 261.

15. K. A. Feng, N. J. Wu, L. H. Zhao, "Anharmonic effect on orientational ordering in adsorped incommensurate mono-layers", Chin. Phys. Lett., 3 (1986), 553.

14. Z. P. Hu, N. J. Wu, A. Ignatiev, "Observation of orientational ordering of Cs chemisorption on graphite", Bull. of Am., 31 (1986), 342.

13. N. J. Wu, A. Ignatiev, "Vibrational properties of the graphite (0001) surface", Surf. Sci., 163(1985), 51.

12. N. J. Wu, A. Ignatiev, "A UHV universal manipulator with direct cooling", Rev. Sci. Instru., 56(1985), 752.

11. N. J. Wu, A. Ignatiev, "The graphite (0001)-(2x2)K surface intercalated structure", book "The Structure of Surfaces, Springer Series in Surface Sciences 2", ed. M. A. Van Hove and S. T. Tong, Springer-Verlag, New York, 1984, P.326.

10. N. J. Wu, "Low energy electron diffraction", Physics, 13 (1984), 596.

9. N. J. Wu, A. Ignatiev, "Layer-by-layer intercalation of potassium into the graphite (0001) surface", Solid State Comm. 46 (1983), 59.

8. N. J. Wu, A. Ignatiev, "Potassium absorption into the graphite (0001) surface: intercalation", Phys. Rev. B28 (1983),7288.

7. N. J. Wu, A. Ignatiev, "Low energy-electron-diffraction structural determination of the graphite (0001) surface", Phys. Rev. B25 (1982), 2983.

6. N. J. Wu, A. Ignatiev, "Low energy electron diffraction study of crystalline graphite and potassium overlayers on graphite", J. Vac. Sci. Technol., 20 (1982), 896.

5. N. J. Wu, S. N. Yu etal., "Surface study of the hydrogen sponge LaNi5", Vacuum, 9(1980), 1.

4. N. J. Wu, "Vigorous development of surface physics research", Physics, 7 (1978), 74.

3. N. J. Wu, "Auger electron spectroscopy and its applications", Physics, 6 (1977), 353.

2. N. J. Wu etal., "3cm band YIG electric tunable oscillator", Magnetic Materials and Devices, 1 (1975), 15.

1. J. Wu, L. D. Shi, "Magnetic property of small superconductor sample in magnetic field", Proc. of Physics Annual convention, 1966, Shanghai.