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  1. No Access

    Article

    Stabilization of the membrane protein bacteriorhodopsin to 140 °C in two-dimensional films

    TWO-DIMENSIONAL assemblies of membrane proteins (see ref. 1, for example) such as bacteriorhodopsin are of current interest because of their potential application in technological areas as diverse as molecular...

    Yi Shen, Cyrus R. Safinya, Keng S. Liang, A. F. Ruppert, Kenneth J. Rothschild in Nature (1993)

  2. No Access

    Article

    Optical Properties of Colloidal MoS2

    We report measurements and analysis of the optical transmission spectra of colloidal 2H-MoS2, prepared by ultrasonic shattering of synthetic crystals in N-Methyl Formamide. We used a combination of TEM, X-ray dif...

    G. A. Wagoner, P. D. Persans, A. F. Ruppert in MRS Online Proceedings Library (1992)

  3. No Access

    Article

    Particle Shape Effects on Optical Absorption in Semiconductor Colloids

    The absorption spectrum of small MoS2 particles in colloidal dispersions differs significantly from that of bulk material. In particular the amplitude and position of exciton absorption peaks shifts when small pa...

    P. D. Persans, E. Lu, J. Haus, G. Wagoner, A. F. Ruppert in MRS Online Proceedings Library (1990)

  4. No Access

    Article

    Interface Roughness and X-Ray Reflectivity of Amorphous Semiconductor Multilayers

    We report high-resolution small-angle x-ray reflectivity measurements on plasma-deposited a-Ge:H/a-Si:H periodic amorphous multilayers. We show that reflectivity spectra are quite complex, involving components...

    P. D. Persans, A. F. Ruppert, V. Pantojas, K. Liang… in MRS Online Proceedings Library (1990)

  5. No Access

    Article

    Structural Stability of Amorphous Semiconductor Superlattices

    We report recent results of studies of the structure and thermal stability of periodic multilayers based on hydrogenated amorphous silicon, hydrogenated amorphous germanium, silicon nitride and silicon oxide. ...

    P. D. Persans, A. F. Ruppert, B. Abeles, Y. J. Wu… in MRS Online Proceedings Library (1989)

  6. No Access

    Article

    Preparation and Characterization of Molybdenum Disulfide Microcrystals in Colloidal Dispersion

    We report the preparation and general, optical and resonant Raman scattering characterization of MoS2 platelets suspended in an insulating organic liquid. Structural results indicate that the platelets are predom...

    E. Lu, P. D. Persans, A. F. Ruppert, R. R. Chianelli in MRS Online Proceedings Library (1989)

  7. No Access

    Article

    High-Resolution X-Ray Characterization of Amorphous Semiconductor Multilayers

    We discuss high-resolution x-ray diffraction measurements on a-Si:H/a-Ge:H periodic amorphous multilayers. Analysis of the data using the dynamical theory yields information on layer thicknesses and densities,...

    P. D. Persans, A. F. Ruppert, B. Abeles, G. Hughes… in MRS Online Proceedings Library (1989)

  8. No Access

    Article

    Stability and Crystallization of Amorphous Semiconductor Multilayers

    We discuss recent measurements of relaxation, interdiffusion and crystallization in amorphous hydrogenated semiconductors and insulators prepared as periodic multilayers. The stability of multilayer structures...

    P. D. Persans, A. F. Ruppert, B. Abeles in MRS Online Proceedings Library (1987)

  9. No Access

    Article

    Surface Disorder and Exfoliation in Lithographically Textured Molybdenum Disulfide

    Lithographic techniques have been used to prepare transmission electron microscopy samples of MoS2, allowing examination of the edge surface with single-layer resolution. We observe that these surfaces are easily...

    C. B. Roxlo, H. W. Deckman, J. H. Dunsmuir, A. F. Ruppert… in MRS Online Proceedings Library (1986)

  10. No Access

    Article

    Atomic Interdiffusion in Amorphous Silicon and Germanium

    We present measurements of interdiffusion in amorphous silicon/amorphous germanium compositional multilayer structures using Raman scattering and optical absorption spectroscopies. We find that interdiffusion ...

    P. D. Persans, A. F. Ruppert in MRS Online Proceedings Library (1985)

  11. No Access

    Chapter

    Defect Passivation and Photoconduction in Sputtered a-Ge:H

    Studies of reactively sputtered a-Ge:H show that the dangling bond density measured by optical absorption and electron spin resonance decreases exponentially with increasing hydrogen partial pressure. The magn...

    P. D. Persans, A. F. Ruppert, C. B. Roxlo in Tetrahedrally-Bonded Amorphous Semiconductors (1985)