Gold layer deposited

Template-stripping Technique as Another Route for Preparation of Flat Cold Substrates This technique, first reported by Hegner et ah, has been developed as an improved method for preparing a widely flat gold surface on mica [164, 165]. The basic idea is to use the first deposited gold layer directly in contact with the... 

A schematic of the working electrode configuration is shown in Fig. 12. The radius of the quartz disk, Tq, is 1/2 inch the thickness, dq, is 1/8 inch. A thin layer of titanium ( 5 x 10 cm) is vapor deposited on the quartz disk followed by deposition of the desired thickness, of gold (generally 10 cm where noted 0.3 x 10 " cm). The radius of the deposited gold layer, r, is 1.1 cm the radius of the exposed electrode, /- , is 0.475 cm. Details of the preparation of the gold electrode are presented in Sec. V.B. The entire assembly is held together with a simple clamp (not shown in Fig. 12). 

Referring to the right-hand side of an equation or portion of an equation Radius of vapor deposited gold layer on quartz disk Fraction of light reflected from electrode surface... 

Schematic diagrams for the synthetic schemes are illustrated in Fig. 15.5. To briefly summarize, silica nanoparticles were synthesized by the Stober-method and then coated with a Sn layer, which acts as a linker site for gold deposition. Gold layers were coated on the Sn-functionaUzed silica nanoparticles by reduction of HAuCLt. Finally, the gold-coated silica nanoparticles were covered...

The pores in a commercially available polycarbonate filtration membrane (Poretics) were used as templates to form the nanotubules (pore diameter = 50 nm pore density = 6 X 10 pores cm thickness = 6 pm). As before, the electrolessly plated Au deposits both on the pore walls and the membrane faces [71]. The gold surface layers on the membrane faces allow us to make electrical contact to the Au nanotubules within the pores. The thickness of the gold layers deposited on the pore walls can be controlled... 

Successive Reduction of Metal Ions. Successive reduction of two metal salts can be considered as one of the most suitable methods to prepare core/shell structured bimetallic particles (Fig. 9.1.3). In 1970, Turkevich and Kim tried to grow gold on Pd nanoparticles to obtain gold-layered Pd nanoparticles (39). The deposition of one... 

Aluminum Oxide Moisture Sensor. This type of sensor is a capacitor, formed by depositing a layer of porous aluminum oxide onto a conductive substrate, and then coaling the oxide with a thin film of gold The conductive base and the gold layer become the capacitor s electrodes. Water vapor penetrates the gold layer and is absorbed by the porous oxidation layer The number of water molecules absorbed determines the electrical impedance of the capacity, which is. m turn, a measure of water vapor pressure. 

The most common substrates used to deposit gold are glass [6,10,12] or various forms of quartz or fused silica [7,8,11,13,14], although an other polyimide substrate named Kapton HN [9] has been used. In many cases, adhesion of the deposited film to the substrate may be inherently poor. It is extremely desirable in such cases to deposit a thin layer of an intermediate material as titanium [6,8,12] or chromium [10,13] that has better adhesion to the substrate. 

The sensor is based on high affinity of gold to mercury and on chemo-resistive properties of ultrathin gold layers adsorption of mercury leads to increase in the surface resistance [1,2]. However, this effect is not selective similar changes are caused by adsorption of water vapor and sulfuric compounds. The use of monomolecular layer of alkylthiols as a filter excludes this interference completely [3]. Sensor calibration is performed by thermoinjection of nanogram-amount of mercury quantitatively deposited by electrochemical reduction [4],... 

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