Palladium films with good adhesive strength were deposited on 316L stainless steel by brush plating. Scanning electronic microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy （XPS）, mass...Palladium films with good adhesive strength were deposited on 316L stainless steel by brush plating. Scanning electronic microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy （XPS）, mass loss tests and electrochemical methods were used to study the properties of the films. The brush plated palladium film mainly consisted of palladium. XPS analysis indicated that palladium was present in the films as metal state. The palladium plated stainless steel samples showed excellent corrosion resistance in boiling 20% H2SO4 solution and boiling acetic/formic acids with 0.005 mol/L Br- ions added. The corrosion rates of the palladium plated 316L stainless steel samples were about two orders of magnitude lower than those of the original 316L stainless steel samples. This method provides a possibility to prepare protective palladium films on stainless steel facilities with large areas in industrial sites.展开更多
The palladium/yttrium films were prepared using magnetron sputtering technique. The changes of crystal structure, morphology and optical properties of the films during the hydrogen absorption/desorption process were i...The palladium/yttrium films were prepared using magnetron sputtering technique. The changes of crystal structure, morphology and optical properties of the films during the hydrogen absorption/desorption process were investigated. The results of SEM and AFM analysis show that yttrium films have columnar structure, and the Pd cover layers on the surface of the yttrium films are composed of nanometer-sized Pd particles, which contain a large amount of smaller crystalline grains. During the gas hydrogen absorption/desorption process, YH3 and YH2 hydrides form on the sites of Pd grains contacting with Y grains. Upon hydrogenation, YH3 hydride forms and the switchable optical properties can be observed. The light transparency of the films increases with the increasing of hydrogen loading time and the light wavelength, and the absorption limitation occurs at λ=400 nm. Upon dehydrogenation, YH3 hydride dissociates into YH2 hydride, and the maximum transparency occurs at λ=689 nm.展开更多
Ti-Pd-Ni thin films were prepared by sputter deposition at room temperature. The as-deposited thin films were crystallized at 750°C followed by various cooling conditions, and the structural change emerging in th...Ti-Pd-Ni thin films were prepared by sputter deposition at room temperature. The as-deposited thin films were crystallized at 750°C followed by various cooling conditions, and the structural change emerging in the films was characterized by means of both X-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was found that the phase transformation temperatures of Ti50.6Pd30Ni19.4 ingot we much higher than those of its thin film. The B19' and B19 phases coexisted, together with the Ti2Ni type and Ti2Pd type of precipitates at the room temperature. Both the B19-B2 one-stage and the B19'-B19-B2 two-stage phase transformations took place when the films experienced thermal change across the region of phase transformation temperatures.展开更多
Platinum, palladium and their alloy films on polyimide were formed by catalyst-enhanced chemical vapor deposition （CVD） in the carrier gas （N2, O2） at 220-300℃ under reduced pressure and normal pressure. The depo...Platinum, palladium and their alloy films on polyimide were formed by catalyst-enhanced chemical vapor deposition （CVD） in the carrier gas （N2, O2） at 220-300℃ under reduced pressure and normal pressure. The deposition of palladium complexes [ Pd（（η3-allyl）（hfac） and Pd（hfac）2 ] gives pure palladium film, while the deposition of platinum needs the enhancement of palladium complex by mixing precursor platinum complex Pt（COD）Me2 and palladium complex in the same chamber. The co-deposition of Pd and Pt metals was used for the deposition of alloy films. During the CVD of palladium-platinum alloy, the Pd/Pt atomic ratios vary under different co-deposition conditions. These metal films were characterized by XPS and SEM, and show a good adhesive property.展开更多
文摘Palladium films with good adhesive strength were deposited on 316L stainless steel by brush plating. Scanning electronic microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy （XPS）, mass loss tests and electrochemical methods were used to study the properties of the films. The brush plated palladium film mainly consisted of palladium. XPS analysis indicated that palladium was present in the films as metal state. The palladium plated stainless steel samples showed excellent corrosion resistance in boiling 20% H2SO4 solution and boiling acetic/formic acids with 0.005 mol/L Br- ions added. The corrosion rates of the palladium plated 316L stainless steel samples were about two orders of magnitude lower than those of the original 316L stainless steel samples. This method provides a possibility to prepare protective palladium films on stainless steel facilities with large areas in industrial sites.
文摘The palladium/yttrium films were prepared using magnetron sputtering technique. The changes of crystal structure, morphology and optical properties of the films during the hydrogen absorption/desorption process were investigated. The results of SEM and AFM analysis show that yttrium films have columnar structure, and the Pd cover layers on the surface of the yttrium films are composed of nanometer-sized Pd particles, which contain a large amount of smaller crystalline grains. During the gas hydrogen absorption/desorption process, YH3 and YH2 hydrides form on the sites of Pd grains contacting with Y grains. Upon hydrogenation, YH3 hydride forms and the switchable optical properties can be observed. The light transparency of the films increases with the increasing of hydrogen loading time and the light wavelength, and the absorption limitation occurs at λ=400 nm. Upon dehydrogenation, YH3 hydride dissociates into YH2 hydride, and the maximum transparency occurs at λ=689 nm.
基金sponsored by the Science and Technology Commission of the Shanghai Municipal Government(No.00JC14055)
文摘Ti-Pd-Ni thin films were prepared by sputter deposition at room temperature. The as-deposited thin films were crystallized at 750°C followed by various cooling conditions, and the structural change emerging in the films was characterized by means of both X-ray diffraction (XRD) and differential scanning calorimetry (DSC). It was found that the phase transformation temperatures of Ti50.6Pd30Ni19.4 ingot we much higher than those of its thin film. The B19' and B19 phases coexisted, together with the Ti2Ni type and Ti2Pd type of precipitates at the room temperature. Both the B19-B2 one-stage and the B19'-B19-B2 two-stage phase transformations took place when the films experienced thermal change across the region of phase transformation temperatures.
基金Funded by the National Natural Science Foundation of China (Nos. 20275011 and 20675033)
文摘Platinum, palladium and their alloy films on polyimide were formed by catalyst-enhanced chemical vapor deposition （CVD） in the carrier gas （N2, O2） at 220-300℃ under reduced pressure and normal pressure. The deposition of palladium complexes [ Pd（（η3-allyl）（hfac） and Pd（hfac）2 ] gives pure palladium film, while the deposition of platinum needs the enhancement of palladium complex by mixing precursor platinum complex Pt（COD）Me2 and palladium complex in the same chamber. The co-deposition of Pd and Pt metals was used for the deposition of alloy films. During the CVD of palladium-platinum alloy, the Pd/Pt atomic ratios vary under different co-deposition conditions. These metal films were characterized by XPS and SEM, and show a good adhesive property.
