ChemInform Abstract: Vibrational Sum Frequency Spectroscopy on Pd(111) and Supported Pd Nanoparticles: CO Adsorption from Ultrahigh Vacuum to Atmospheric Pressure.

ChemInform ◽  
2010 ◽  
Vol 33 (12) ◽  
pp. no-no
Author(s):  
Holger Unterhalt ◽  
Guenther Rupprechter ◽  
Hans-Joachim Freund
Keyword(s):  
Atmospheric Pressure ◽  
Co Adsorption ◽  
Ultrahigh Vacuum ◽  
Pd Nanoparticles ◽  
Sum Frequency ◽  
Sum Frequency Spectroscopy ◽  
Vibrational Sum Frequency Spectroscopy ◽  
Supported Pd

Effects of Reorientation in Vibrational Sum-Frequency Spectroscopy†

2007 ◽  
Vol 111 (25) ◽  
pp. 8902-8915 ◽  
Author(s):  
John T. Fourkas ◽  
Robert A. Walker ◽  
Suleyman Z. Can ◽  
Erez Gershgoren
Keyword(s):  
Sum Frequency ◽  
Sum Frequency Spectroscopy ◽  
Vibrational Sum Frequency Spectroscopy

scholarly journals Experimentally probing the libration of interfacial water: the rotational potential of water is stiffer at the air/water interface than in bulk liquid

2016 ◽  
Vol 18 (27) ◽  
pp. 18424-18430 ◽  
Author(s):  
Yujin Tong ◽  
Tobias Kampfrath ◽  
R. Kramer Campen
Keyword(s):  
Liquid Water ◽  
Bulk Liquid ◽  
Interfacial Water ◽  
Water Interface ◽  
Sum Frequency ◽  
Sum Frequency Spectroscopy ◽  
Air Water Interface ◽  
Vibrational Sum Frequency Spectroscopy

Vibrational sum frequency spectroscopy measurements reveal that the libration frequency of interfacial water is significantly higher than bulk liquid water, suggesting that water's rotational potential stiffens on moving from the bulk liquid to the air/water interface.

scholarly journals Influence of support morphology on the bonding of molecules to nanoparticles

2015 ◽  
Vol 112 (26) ◽  
pp. 7903-7908 ◽  
Author(s):  
Chi Ming Yim ◽  
Chi L. Pang ◽  
Diego R. Hermoso ◽  
Coinneach M. Dover ◽  
Christopher A. Muryn ◽  
...  
Keyword(s):  
Single Crystal ◽  
Surface Science ◽  
Heterogeneous Catalysts ◽  
Co Adsorption ◽  
Pd Nanoparticles ◽  
Metal Single Crystals ◽  
Supported Metal Nanoparticles ◽  
X Ray Absorption ◽  
Supported Pd ◽  
Identical Fashion

Supported metal nanoparticles form the basis of heterogeneous catalysts. Above a certain nanoparticle size, it is generally assumed that adsorbates bond in an identical fashion as on a semiinfinite crystal. This assumption has allowed the database on metal single crystals accumulated over the past 40 years to be used to model heterogeneous catalysts. Using a surface science approach to CO adsorption on supported Pd nanoparticles, we show that this assumption may be flawed. Near-edge X-ray absorption fine structure measurements, isolated to one nanoparticle, show that CO bonds upright on the nanoparticle top facets as expected from single-crystal data. However, the CO lateral registry differs from the single crystal. Our calculations indicate that this is caused by the strain on the nanoparticle, induced by carpet growth across the substrate step edges. This strain also weakens the CO–metal bond, which will reduce the energy barrier for catalytic reactions, including CO oxidation.

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