Abstract:
The work function of electron emitters can be modified by forming a modifying layer at the surface using low energy ion implantation, in a controlled environment, placing chosen elements below the surface of electron emitters as Cs implanted in Si(100) at four different doses illustrates. Sometimes implanted species are deep enough that they do not react with the atmosphere during subsequent low-temperature processing. Then, species implanted in the emitting surfaces are segregated using elevated temperature treatment of the emitters in vacuum and/or reactive gases. The implanted ions modify the work function at the surface, via thin layers of the implanted species on top of the emitter surfaces, or compounds or alloy layers at the surface of the emitters. Depending on the implanted species, the initial emitter material, and the environment, these layers can either increase or decease the work function of the emitter.
Abstract:
Anti-static cleanroom products having a coating of conductive polymeric particulates which decreases the surface resistivity of the products. Preferably, the particulates are pyrrole polymers. The anti-static properties are achieved by depositing conductive polymer particles onto the non-conductive substrate surface. The anti-static products include cleanroom wipers, stationery products (notebooks and writing instruments), garments and swabs (polyurethane foam tipped). The cleanroom stationery products include notebooks comprising polyethylene impregnated with silica. The invention also includes anti-static plastic gloves.
Abstract:
A biaxially textured article includes a rolled and annealed, biaxially textured substrate of a metal having a face-centered cubic, body-centered cubic, or hexagonal close-packed crystalline structure; and an epitaxial superconductor or other device epitaxially deposited thereon.
Abstract:
A thin film device having a selectively passivated surface (16) is provided. An embodiment of the device is particularly suited to detection of chemical constituents by selective adsorption, where the selectively passivated surface (16) is inert to the chemical constituent being detected. A method of fabrication of the device is also provided in which the selective passivation is achieved by selectively applying the metallic adhesive (14) to the substrate (12). The migration of the metallic adhesive (14) through the thin film layer (16) is essentially normal to the surface of the substrate (12), thereby limiting the passivation of the thin film layer (16) to the surface areas directly overlying the metallic adhesive (14).
Abstract:
A method is disclosed of forming thin uniform micron range and submicron range aberration-resistant and hole-free high-temperature thermally stable metal oxide coatings upon metal, insulating and other substrates, involving the application of a polymer metal complex precursor solution to the substrate and appropriate firing for oxidation of the metal and the coating while burning off all traces of the polymer. Insulating metal oxide coatings on conducting and semiconducting substrates are produced, and, if desired, conducting metal oxide coatings on insulating or semiconducting substrates.
Abstract:
An additive process for making printed circuit boards utilizing aqueous alkaline strippable resists, in which a suitable insulating substrate is patterned with the resist, the resist-patterned substrate catalyzed to electroless metal deposition, the resist then stripped completely from the substrate, utilizing an aqueous alkaline solution, preferably containing a reducing agent, and the electroless metal then deposited over the areas of the substrate catalyzed in the desired pattern.
Abstract:
The spreading of liquids, e.g., an epoxy resin, on a surface can be prevented or reduced if an inhibitor is added to the liquid. Inhibitors according to the invention have the generic formula [CX3-(CY2)n]N-R, where X is H or F, Y is H, F, or Cl, n is a number from about 1 to about 12, R is a carboxylic acid, an amide, a substituted amide, an amine, an alcohol, or an ester functionality, and N is 1, 2, or 3 if R is an alcohol or amine functionality, and 1 otherwise. The inhibitor typically has substantial solubility in at least one of the constituents of the liquid, and the liquid typically contains between about 0.05% and about 5% by weight of the inhibitor. Preferred inhibitors are perfluorooctanoic acid and 1H, 1H-pentadecafluorooctyl amine.
Abstract:
Processes for forming nitride films in integrated circuit manufacture are accomplished by chemical vapor deposition using nitrogen fluoride (NF3) as a nitrogen-bearing gas providing nitrogen to the nitride film. The method includes the steps of placing a substrate in a CVD reactor chamber (11), heating the substrate (25), and flowing the precursors including nitrogen fluoride over the surface of the heated substrate to form the nitride films. Process examples are provided wherein the nitrided films are tungsten nitride, tungsten silicon nitride, and titanium silicon nitride. Process variations include film formation with and without plasma enhancement, and provision of silicon to films be either silane or disilane.
Abstract:
The invention features a composition for immersion plating comprising an aqueous solution of a noble metal salt and a complexing agent for ions of the noble metal, said solution having a pH of from about 0 to 5.5. The noble metal is preferably palladium in the form of palladium nitrate. The complexing agent is preferably oxalic acid. The composition is used in a method of immersion plating which comprises contacting a substrate which is preferably a copper or copper alloy component of a printed circuit board with the composition for a period of time sufficient to coat palladium onto the copper surface in a uniform manner. The methodology provides for a high degree of uniformity, good adhesion between the palladium and the copper as well as a relatively thin coating. Further, the palladium coating is carried out in a relatively short period of time and provides a longlived solderable finish.
Abstract:
A process for efficient modification and metallization of substrates includes the steps of providing a substrate with highly photoefficient chemical functional groups on at least a portion of this substrate, exposing the substrate to actinic radiation to transform, deactivate, or remove these chemical functional groups, to modify their chemical reactivity, and carrying out further chemical reaction steps on these modified chemical functional groups.