The Experts below are selected from a list of 4110 Experts worldwide ranked by ideXlab platform
Wei Wang - One of the best experts on this subject based on the ideXlab platform.
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a direct amine Palladium Acetate cocatalyzed saegusa oxidation reaction of unmodified aldehydes to α β unsaturated aldehydes
Advanced Synthesis & Catalysis, 2009Co-Authors: Jin Zhu, Jie Liu, Hexin Xie, Hualiang Jiang, Wei WangAbstract:A direct preparation of synthetically useful α,β-unsaturated aldehydes from readily available aldehydes has been developed. The process is effectively cocatalyzed by an amine-Palladium Acetate to give rise to α,β-unsaturated aldehydes in moderate to good yields (41―62%). The reaction features the use of unmodified aldehydes rather than enol silyl ethers, which are used in a typical Saegusa oxidation reaction.
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A Direct Amine‐Palladium Acetate Cocatalyzed Saegusa Oxidation Reaction of Unmodified Aldehydes to α,β‐Unsaturated Aldehydes
Advanced Synthesis & Catalysis, 2009Co-Authors: Jin Zhu, Jie Liu, Hexin Xie, Hualiang Jiang, Wei WangAbstract:A direct preparation of synthetically useful α,β-unsaturated aldehydes from readily available aldehydes has been developed. The process is effectively cocatalyzed by an amine-Palladium Acetate to give rise to α,β-unsaturated aldehydes in moderate to good yields (41―62%). The reaction features the use of unmodified aldehydes rather than enol silyl ethers, which are used in a typical Saegusa oxidation reaction.
Ian W. Boyd - One of the best experts on this subject based on the ideXlab platform.
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Kinetic study of 222 nm excimer lamp induced decomposition of Palladium-Acetate films
Applied Surface Science, 1999Co-Authors: Zsolt Geretovszky, Ian W. BoydAbstract:Abstract Wavelength selectivity, high intensity, long lifetime and low maintenance cost make excimer lamps a popular UV source for large area processing. Photo-induced metal seeding followed by electroless plating is one area where the use of these efficient light sources can contribute to the development of new techniques aimed at reducing the processing temperature. Although, the use of Palladium-Acetate to produce Pd seed layers has already been studied with various energy sources, including excimer lasers and lamps, the details of the photochemical mechanisms involved are still largely unexplored. In this paper the kinetics of 222 nm KrCl* excimer lamp initiated Palladium-Acetate decomposition are presented. The species ejected from the irradiated films were monitored in situ by mass spectrometry at ultra high vacuum. Interpretation of the time evolution of multichannel mass spectrometric data, together with complementary infrared, UV-visible spectrophotometric characterization has led to an understanding of the governing physical and chemical mechanisms which are described here for the first time.
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Investigations of photo-induced decomposition of Palladium Acetate for electroless copper plating
Thin Solid Films, 1998Co-Authors: Junying Zhang, Ian W. BoydAbstract:Photo-induced decomposition of Palladium Acetate films has been performed by using argon and xenon excimer vacuum ultraviolet (VUV) sources that emit radiation peaking at wavelengths of 126 and 172 nm, respectively. VUV irradiation of a substrate treated with Palladium Acetate results in the formation of Palladium, which acts as a catalyst for subsequent copper plating by means of an electroless bath. A selective copper pattern can thus be formed in a simple process using a contact mask. The surface morphology of films on silicon substrates has been investigated using an atomic force microscope (AFM) and a scanning electron microscope (SEM). Exposure conditions were found to affect the morphology and density of the Pd activation layer. The electrical resistivity of the films, measured by four-point probe, and the adhesion strength of copper on the Pd-nucleated substrate, were both found to be dependent on the thickness of the Palladium.
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Photo-decomposition of thin Palladium Acetate films with 126 nm radiation
Applied Physics A, 1997Co-Authors: Jing Zhang, Ian W. BoydAbstract:O3, AlN and Si substrates produced by vacuum ultraviolet induced decomposition of Palladium Acetate is described. The Palladium films formed and the Palladium Acetate layers used were characterised by using ultraviolet spectrophotometry and Fourier transform infrared (FTIR) spectroscopy. The optical transmission of the films after irradiation with pseudo-continuous 126 nm radiation generated by an excimer lamp provided information about the decomposition rate at different pressures and exposure times. The FTIR spectra recorded the chemical changes of the C=O, COO- and CH3 groups at different exposure times. The decomposition mechanism of the Palladium Acetate under these conditions appears to be quite different to that induced by pulsed laser irradiation.
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VUV light-induced decomposition of Palladium Acetate films for electroless copper plating
Applied Surface Science, 1997Co-Authors: Junying Zhang, Ian W. Boyd, Simon L. King, Q. FangAbstract:VUV light-induced decomposition of Palladium Acetate films has been performed using a novel excimer lamp source of 126 nm radiation. Such exposure results in the formation of Palladium, which acts as an activator for copper plating by means of an electroless bath. Selective copper patterns can thus be formed. The change in the optical transmission of the films formed on quartz after irradiation was observed using a UV spectrophotometer. The morphology of the metal layers produced was investigated with an atomic force microscope (AFM) and a scanning electron microscope (SEM). This low cost, large area, VUV source can provide a most useful route for low temperature photon-initiated processing.
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Decomposition mechanisms of thin Palladium Acetate film with excimer UV radiation
Applied Surface Science, 1996Co-Authors: Junying Zhang, Hilmar Dr Esrom, Ian W. BoydAbstract:Pre-nucleation of surfaces with Palladium from thin Palladium Acetate films on a range of substrate materials by UV-induced decomposition is described. The optical transmission of the films after irradiation with incoherent UV radiation from several excimer lamp sources provided information about the deposition rate at different UV intensities and exposure times using three different wavelengths: λ = 172 nm (Xe 2 * ), λ = 222 nm (KrCl * ), and λ = 308 nm (Xecl * ). The gaseous products produced during UV exposure were measured using mass spectrometry (MS). The decomposed products such as H 2 O, CO 2 , + CCH 3 , + COCH 3 and + CH 3 were observed. The decomposition mechanism of Palladium Acetate is discussed and a simple model calculation describing photolytic decomposition processes in the thin Palladium Acetate films is presented. Results will be compared to those obtained by laser and thermal decomposition of Palladium Acetate. The deposited Palladium can act as an activator for subsequent pattemed chemical metal deposition techniques in which micrometer thick copper, nickel, or gold layers with good electrical resistivity are applied.
Junying Zhang - One of the best experts on this subject based on the ideXlab platform.
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Investigations of photo-induced decomposition of Palladium Acetate for electroless copper plating
Thin Solid Films, 1998Co-Authors: Junying Zhang, Ian W. BoydAbstract:Photo-induced decomposition of Palladium Acetate films has been performed by using argon and xenon excimer vacuum ultraviolet (VUV) sources that emit radiation peaking at wavelengths of 126 and 172 nm, respectively. VUV irradiation of a substrate treated with Palladium Acetate results in the formation of Palladium, which acts as a catalyst for subsequent copper plating by means of an electroless bath. A selective copper pattern can thus be formed in a simple process using a contact mask. The surface morphology of films on silicon substrates has been investigated using an atomic force microscope (AFM) and a scanning electron microscope (SEM). Exposure conditions were found to affect the morphology and density of the Pd activation layer. The electrical resistivity of the films, measured by four-point probe, and the adhesion strength of copper on the Pd-nucleated substrate, were both found to be dependent on the thickness of the Palladium.
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VUV light-induced decomposition of Palladium Acetate films for electroless copper plating
Applied Surface Science, 1997Co-Authors: Junying Zhang, Ian W. Boyd, Simon L. King, Q. FangAbstract:VUV light-induced decomposition of Palladium Acetate films has been performed using a novel excimer lamp source of 126 nm radiation. Such exposure results in the formation of Palladium, which acts as an activator for copper plating by means of an electroless bath. Selective copper patterns can thus be formed. The change in the optical transmission of the films formed on quartz after irradiation was observed using a UV spectrophotometer. The morphology of the metal layers produced was investigated with an atomic force microscope (AFM) and a scanning electron microscope (SEM). This low cost, large area, VUV source can provide a most useful route for low temperature photon-initiated processing.
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Decomposition mechanisms of thin Palladium Acetate film with excimer UV radiation
Applied Surface Science, 1996Co-Authors: Junying Zhang, Hilmar Dr Esrom, Ian W. BoydAbstract:Pre-nucleation of surfaces with Palladium from thin Palladium Acetate films on a range of substrate materials by UV-induced decomposition is described. The optical transmission of the films after irradiation with incoherent UV radiation from several excimer lamp sources provided information about the deposition rate at different UV intensities and exposure times using three different wavelengths: λ = 172 nm (Xe 2 * ), λ = 222 nm (KrCl * ), and λ = 308 nm (Xecl * ). The gaseous products produced during UV exposure were measured using mass spectrometry (MS). The decomposed products such as H 2 O, CO 2 , + CCH 3 , + COCH 3 and + CH 3 were observed. The decomposition mechanism of Palladium Acetate is discussed and a simple model calculation describing photolytic decomposition processes in the thin Palladium Acetate films is presented. Results will be compared to those obtained by laser and thermal decomposition of Palladium Acetate. The deposited Palladium can act as an activator for subsequent pattemed chemical metal deposition techniques in which micrometer thick copper, nickel, or gold layers with good electrical resistivity are applied.
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new approach of a laser induced forward transfer for deposition of patterned thin metal films
Applied Surface Science, 1995Co-Authors: Hilmar Dr Esrom, Junying Zhang, Ulrich Kogelschatz, Anthony J PedrazaAbstract:Abstract An excimer laser-induced forward transfer technique has been used for selective prenucleation of arbitrary substrate materials with Palladium. Palladium Acetate films on a quartz substrate were irradiated through the support causing simultaneous decomposition of the Palladium Acetate and deposition of Palladium on a substrate at a short distance to the Palladium Acetate film. The Palladium layer, only a few nanometres thick, can act as catalyst for subsequent chemical deposition of metallic films, e.g., copper, nickel, gold etc., of micrometer thickness.
Hualiang Jiang - One of the best experts on this subject based on the ideXlab platform.
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a direct amine Palladium Acetate cocatalyzed saegusa oxidation reaction of unmodified aldehydes to α β unsaturated aldehydes
Advanced Synthesis & Catalysis, 2009Co-Authors: Jin Zhu, Jie Liu, Hexin Xie, Hualiang Jiang, Wei WangAbstract:A direct preparation of synthetically useful α,β-unsaturated aldehydes from readily available aldehydes has been developed. The process is effectively cocatalyzed by an amine-Palladium Acetate to give rise to α,β-unsaturated aldehydes in moderate to good yields (41―62%). The reaction features the use of unmodified aldehydes rather than enol silyl ethers, which are used in a typical Saegusa oxidation reaction.
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A Direct Amine‐Palladium Acetate Cocatalyzed Saegusa Oxidation Reaction of Unmodified Aldehydes to α,β‐Unsaturated Aldehydes
Advanced Synthesis & Catalysis, 2009Co-Authors: Jin Zhu, Jie Liu, Hexin Xie, Hualiang Jiang, Wei WangAbstract:A direct preparation of synthetically useful α,β-unsaturated aldehydes from readily available aldehydes has been developed. The process is effectively cocatalyzed by an amine-Palladium Acetate to give rise to α,β-unsaturated aldehydes in moderate to good yields (41―62%). The reaction features the use of unmodified aldehydes rather than enol silyl ethers, which are used in a typical Saegusa oxidation reaction.
Jin Zhu - One of the best experts on this subject based on the ideXlab platform.
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a direct amine Palladium Acetate cocatalyzed saegusa oxidation reaction of unmodified aldehydes to α β unsaturated aldehydes
Advanced Synthesis & Catalysis, 2009Co-Authors: Jin Zhu, Jie Liu, Hexin Xie, Hualiang Jiang, Wei WangAbstract:A direct preparation of synthetically useful α,β-unsaturated aldehydes from readily available aldehydes has been developed. The process is effectively cocatalyzed by an amine-Palladium Acetate to give rise to α,β-unsaturated aldehydes in moderate to good yields (41―62%). The reaction features the use of unmodified aldehydes rather than enol silyl ethers, which are used in a typical Saegusa oxidation reaction.
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A Direct Amine‐Palladium Acetate Cocatalyzed Saegusa Oxidation Reaction of Unmodified Aldehydes to α,β‐Unsaturated Aldehydes
Advanced Synthesis & Catalysis, 2009Co-Authors: Jin Zhu, Jie Liu, Hexin Xie, Hualiang Jiang, Wei WangAbstract:A direct preparation of synthetically useful α,β-unsaturated aldehydes from readily available aldehydes has been developed. The process is effectively cocatalyzed by an amine-Palladium Acetate to give rise to α,β-unsaturated aldehydes in moderate to good yields (41―62%). The reaction features the use of unmodified aldehydes rather than enol silyl ethers, which are used in a typical Saegusa oxidation reaction.