Vacuum evaporation

About: Vacuum evaporation is a research topic. Over the lifetime, 3492 publications have been published within this topic receiving 48767 citations.

Application of A-C Techniques to the Study of Lithium Diffusion in Tungsten Trioxide Thin Films

Abstract: The small signal a-c impedance of the cell Li]LiAsF6 (0.75M) in propylene carbonatel Lip V~O3 thin film on tin oxide covered glass substrate has been measured at room temperature as a function of frequency from 5  10 -4 Hz to 5 X l0 s Hz at various open-circuit voltages. The diffusion equations have been solved for the appropriate finite boundary conditions, and analysis of the impedance data by the complex plane method yields values for the chemical diffusion coefficient, the component diffusion coefficient, the partial ionic conductivity of lithium, and the thermodynamic enhancement factor for LiyWO3 as a function of y. The films of WO3 were prepared by vacuum evaporation and were largely amorphous to x-rays. The chemical diffusion coefficient has a value of 2.4  10 -12 cm2/sec at y _-- 0.1, increasing to 2.8 X 10 -11 cm2/sec at y ---- 0.26. At short times (t ~ 0.5 sec) the interracial charge transfer reaction is important, but at longer times the rate of lithium injection is determined by the diffusion kinetics.

Preparation of Y‐Ba‐Cu oxide superconductor thin films using pulsed laser evaporation from high Tc bulk material

Abstract: We report the first successful preparation of thin films of Y‐Ba‐Cu‐O superconductors using pulsed excimer laser evaporation of a single bulk material target in vacuum. Rutherford backscattering spectrometry showed the composition of these films to be close to that of the bulk material. Growth rates were typically 0.1 nm per laser shot. After an annealing treatment in oxygen the films exhibited superconductivity with an onset at 95 K and zero resistance at 85 and 75 K on SrTiO3 and Al2O3 substrates, respectively. This new deposition method is relatively simple, very versatile, and does not require the use of ultrahigh vacuum techniques.

Fabrication of gold nanodot array using anodic porous alumina as an evaporation mask

Abstract: A highly ordered gold nanodot array was fabricated by vacuum evaporation using an anodic porous alumina membrane with through-holes of nanometer scale as a mask. This technique resulted in an orderly arrangement of Au dots with a diameter of approximately 40 nm over a large area on a Si substrate.

Surface enhanced vibrational spectroscopy

Abstract: The nature and properties of surface-enhanced vibrational spectra of molecules adsorbed on surfaces that can enhance the absorption and the emission of electromagnetic radiation are discussed. Examples of surface-enhanced resonant Raman scattering, surface-enhanced Raman scattering in the near-infrared and surface-enhanced infrared are given. The rough surfaces used are metal island films coated with a nanometric organic film using the Langmuir-Blodgett technique or deposited by vacuum evaporation.

Synthesis and Characterization of Organic−Inorganic Perovskite Thin Films Prepared Using a Versatile Two-Step Dipping Technique

Abstract: A convenient two-step technique for preparing thin films of the organic−inorganic perovskites (RNH3)2(CH3NH3)n-1MnI3n+1 (R = butyl, phenethyl; M = Pb, Sn; n = 1, 2, ∞) has been achieved. Films of the metal halide, MI2, were first deposited onto ash glass or quartz disks using vacuum evaporation or spin-coating. By dipping these inorganic films, at room temperature, into an organic ammonium iodide solution for a short period of time (1−5 min for the layered perovskites), single-phase samples of the corresponding organic−inorganic perovskite thin films were formed. While a variety of solvents can be used for the dipping process, toluene/2-propanol mixtures have been shown to work well for many of the present compounds. The layered organic−inorganic perovskite films exhibited uniform surfaces and strong photoluminescence at wavelengths that were consistent with the corresponding materials made by single-crystal growth from solution. However, dipped organic−inorganic films made from evaporated PbI2 exhibited ...