Surface-mediated reaction pathways of 2,4-pentanedione on clean and oxygen covered Cu (210)

Nigg, H. L.; Ford, Laura P.; Masel, Richard I.

doi:10.1116/1.581459

Cited by 15 publications

(10 citation statements)

References 10 publications

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“…7 and 8 is a sharp peak at approximately 300 K. The relative intensities of the signals at that temperature in the recorded traces for masses below 100 amu are somewhat similar to those measured in the 180 K feature, but additional peaks were also detected at higher masses. Moreover, given that a similar peak was also reported by Nigg et al in TPD experiments with Hacac on Cu(210) (which they assigned to a different product), 60 it is possible that the Cu(acac) 2 detected at this temperature originates, at least in part, from recombination of Cu(acac) and acac adsorbed species on the surface. 9.…”

Section: Resultssupporting

confidence: 81%

See 1 more Smart Citation

Chemistry of Cu(acac)2 on Ni(110) and Cu(110) surfaces: Implications for atomic layer deposition processes

Ma¹,

Zaera²

2012

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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The thermal chemistry of copper(II)acetylacetonate, Cu(acac)2, on Ni(110) and Cu(110) single-crystal surfaces was probed under vacuum by using x-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD). Some data for acetylacetone (Hacac, CH3COCH2COCH3) adsorbed on Ni(110) are also reported as reference. Chemical transformations were identified in several steps covering a temperature range from 150 K to at least 630 K. The desorption of Hacac and a 3-oxobutanal (CH3COCH2CHO) byproduct was observed first at 150 and 180 K on Ni(110) and at 160 and 185 K on Cu(110), respectively. Partial loss of the acetylacetonate (acac) ligands and a likely change in adsorption geometry are seen next, with the possible production of HCu(acac), which desorbs at 200 and 235 K from the nickel and copper surfaces, respectively. Molecular Cu(acac)2 desorption is observed on both surfaces at approximately 300 K, probably from recombination of Cu(acac) and acac surface species. The remaining copper atoms on the surface lose their remaining acac ligands to the substrate and become reduced directly to metallic copper. At the same time, the organic ligands follow a series of subsequent surface reactions, probably involving several C–C bond-scissions, to produce other fragments, additional Hacac and HCu(acac) in the gas phase in the case of the copper surface, and acetone on nickel. A significant amount of acac must nevertheless survive on the surface to high temperatures, because Hacac peaks are seen in the TPD at about 515 and 590 K and the C 1s XPS split associated with acac is seen up to close to 500 K. In terms of atomic layer deposition processes, this suggests that cycles could be design to run at such temperatures as long as an effective hydrogenation agent is used as the second reactant to remove the surface acac as Hacac. Only a small fraction of carbon is left behind on Ni after heating to 800 K, whereas more carbon and additional oxygen remains on the surface in the case of Cu.

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Section: Resultssupporting

confidence: 81%

“…Figures 7 and 8 display results from survey TPD experiments done on Ni(110) and Cu(110), respectively. Similar chemistry was proposed for Hacac on Cu(210) in the past, 60 but the evidence for the identification of the product there was not compelling. In the case of the Ni(110) single crystal (Fig.…”

Section: Resultsmentioning

confidence: 63%

Chemistry of Cu(acac)2 on Ni(110) and Cu(110) surfaces: Implications for atomic layer deposition processes

Ma¹,

Zaera²

2012

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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“…As no halide ions were involved in this reaction, the authors believed that the etchant might have originated from acetylacetonate or a byproduct of acetylacetonate during the reaction. Based on the results of an earlier study reported by Masel and co‐workers,43 the authors suggested that an enol form of acetylacetone might act as a coordination ligand through chelation.…”

Section: Concave Nanocrystals By Site‐specific Dissolutionmentioning

confidence: 99%

Optical coherence tomography as a non‐invasive imaging technique for preinvasive and invasive neoplasia of the uterine cervix

Gallwas¹,

Turk²,

Friese³

et al. 2010

Ultrasound in Obstet & Gyne

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“…The oriented attachment mechanism is partially responsible for the formation of the Pt-Cu and Pt-Ni nanowire structures. [36,37] This may also play an important role in the formation of the porous features. [36,37] This may also play an important role in the formation of the porous features.…”

mentioning

confidence: 99%

Facile Synthesis of Porous PtM (M=Cu, Ni) Nanowires and Their Application as Efficient Electrocatalysts for Methanol Electrooxidation

Lai

Zhang

et al. 2014

ChemCatChem

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Porous Pt 75 Cu 25 and Pt 73 Ni 27 nanowires were successfully synthesized by a one-step wet chemical solution method without the use of any template for the first time. The combination of porous and one-dimensional features and the addition of a second cheap metal offer high catalyst utilization, excellent catalytic activity, and better durability for the methanol oxidation reaction. Porous Pt 75 Cu 25 and Pt 73 Ni 27 nanowires showed mass current densities of 390 (at 0.69) and 503 mA mg À1 (at 0.70 V), respectively. These mass current densities are much higher than that of Pt nanowires (356 mA mg À1 at 0.73 V) and commercial Pt black (195 mA mg À1 at 0.73 V). During the entire 2000 s current-time test, the porous Pt 75 Cu 25 and Pt 73 Ni 27 nanowires also exhibited higher stability for the methanol oxidation reaction than Pt nanowires and commercial Pt black.Platinum (Pt) and its composites are most promising catalysts in fuel cells and other heterogeneous catalytic processes. Nevertheless, the high cost as well as the insufficient catalytic activity and stability of Pt catalysts pose a severe challenge for broad applications. [1] Various strategies have thus been developed to improve the catalytic activity and stability of Pt catalysts and decrease the Pt loading. [2][3][4][5][6][7][8][9][10][11][12][13] For example, the addition of a second cheap 3d transition metal (e.g., Fe, Co, Ni, Cu) to Pt to form Pt-based heteronanostructures or alloy catalysts could decrease the Pt loading and increase the catalytic activity and poisoning resistance. [14][15][16] If Pt is present as one-dimensional (1 D) nanostructures such as nanowires, its durability is greatly enhanced. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] Porous structures have also been widely employed to enhance catalytic properties owing to their high surface area and rich edge/corner atoms. [32][33][34][35] The combination of 1 D nanostructures and porous structures may further improve performance. However, only a few methods have been developed for the synthesis of porous Pt-based 1 D nanostruc-tures, such as the electrodeposition method, [24,30,31] electrospinning, and a chemical dealloying process. [25] Most reported methods for the synthesis of porous Pt-based nanowires require complicated procedures. To the best of our knowledge, one-step synthetic methods without stabilizers, templates, or external fields for the preparation of porous Pt-based nanowires have never been reported.Herein, we report the one-step synthesis of porous PtM (M = Cu, Ni) nanowires for the first time. The porous PtM (M = Cu, Ni) nanowires were synthesized by solvothermal reaction. The combination of a nanowire structure, porous structure, and the addition of a second cheap metal improves the electrocatalytic activity and durability and saves cost. The application of porous PtM (M = Cu, Ni) nanowires for the electrocatalytic methanol oxidation reaction (MOR) was studied. The obtained porous PtM (M = Cu, Ni) alloy nanowires can act as highly effective catalysts...

show abstract

Surface-mediated reaction pathways of 2,4-pentanedione on clean and oxygen covered Cu (210)

Cited by 15 publications

References 10 publications

Chemistry of Cu(acac)2 on Ni(110) and Cu(110) surfaces: Implications for atomic layer deposition processes

Chemistry of Cu(acac)2 on Ni(110) and Cu(110) surfaces: Implications for atomic layer deposition processes

Optical coherence tomography as a non‐invasive imaging technique for preinvasive and invasive neoplasia of the uterine cervix

Facile Synthesis of Porous PtM (M=Cu, Ni) Nanowires and Their Application as Efficient Electrocatalysts for Methanol Electrooxidation

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