Sum frequency generation (SFG) - surface vibrational spectroscopy studies of buried interfaces: catalytic reaction intermediates on transition metal crystal surfaces at high reactant pressures; polymer surface structures at the solid-gas and solid-liquid interfaces

Chen, Zhan; Gracias, David H.; Somorjai, Gábor A.

doi:10.1007/s003400050664

Cited by 58 publications

(49 citation statements)

References 41 publications

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“…Although it has only been about twenty years since the first SFG spectra were recorded [41–44], SFG is now being used by a growing number of research groups to study surfaces and interfaces of many different materials [45–71], including polymer surfaces and interfaces. SFG is a second order nonlinear optical spectroscopic technique, which provides vibrational spectra of surfaces and interfaces under the electric dipole approximation [45–71].…”

Section: Sum Frequency Generation (Sfg) Vibrational Spectroscopymentioning

confidence: 99%

Investigating buried polymer interfaces using sum frequency generation vibrational spectroscopy

Chen

2010

Progress in Polymer Science

153

144

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This paper reviews recent progress in the studies of buried polymer interfaces using sum frequency generation (SFG) vibrational spectroscopy. Both buried solid/liquid and solid/solid interfaces involving polymeric materials are discussed. SFG studies of polymer/water interfaces show that different polymers exhibit varied surface restructuring behavior in water, indicating the importance of probing polymer/water interfaces in situ. SFG has also been applied to the investigation of interfaces between polymers and other liquids. It has been found that molecular interactions at such polymer/liquid interfaces dictate interfacial polymer structures. The molecular structures of silane molecules, which are widely used as adhesion promoters, have been investigated using SFG at buried polymer/silane and polymer/polymer interfaces, providing molecular-level understanding of polymer adhesion promotion. The molecular structures of polymer/solid interfaces have been examined using SFG with several different experimental geometries. These results have provided molecular-level information about polymer friction, adhesion, interfacial chemical reactions, interfacial electronic properties, and the structure of layer-by-layer deposited polymers. Such research has demonstrated that SFG is a powerful tool to probe buried interfaces involving polymeric materials, which are difficult to study by conventional surface sensitive analytical techniques.

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Section: Sum Frequency Generation (Sfg) Vibrational Spectroscopymentioning

confidence: 99%

Investigating buried polymer interfaces using sum frequency generation vibrational spectroscopy

Chen

2010

Progress in Polymer Science

153

144

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“…[19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] The SFG technique can be used to probe any surface or interface accessible by light and no vacuum is required. It has all the common advantages of optical techniques: it is nondestructive and is highly sensitive with good spatial, temporal and spectral resolution.…”

Section: Introductionmentioning

confidence: 99%

Molecular Chemical Structure on Poly(methyl methacrylate) (PMMA) Surface Studied by Sum Frequency Generation (SFG) Vibrational Spectroscopy

et al. 2001

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The molecular chemical structure of poly(methyl methacrylate) (PMMA) surface has been studied by sum frequency generation (SFG) vibrational spectroscopy. By using various methods, we have shown that reflected SFG spectra of PMMA collected in our experiments only come from the polymer/air interface, not from the polymer/substrate or the bulk polymer. These SFG spectra are dominated by the vibrational bands from the ester methyl group. Ranges of orientation and orientation distribution of the ester methyl group on the PMMA surface have been deduced. The antisymmetric stretching vibrational band of the alpha methyl group has been detected on the PMMA surface. Analysis shows that the alpha methyl groups are lying down on the surface. The methylene group has not been observed in SFG spectra. For comparison, we have also studied surface chemical structures of poly(methyl acrylate) (PMA) and dimethyl succinate by SFG.

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“…20,21,22,23,24,25,26,27,28 Among these experimental techniques, Second Harmonic Generation and Sum Frequency Generation are the most important methods for molecular interface studies because of their surface sensitivity and specificity. 29,30,31,32,33,34,35,36 With these investigations, the properties of the water molecules at the interface, such as the surface density, surface structure, surface potential as well as surface dynamics, have been intensively discussed. † Also Graduate School of the Chinese Academy of Sciences * Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Polarization and experimental configuration analyses of sum frequency generation vibrational spectra, structure, and orientational motion of the air/water interface

Gan¹,

Wu²,

Zhang³

et al. 2006

The Journal of Chemical Physics

250

332

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Here we report a detailed study on spectroscopy, structure and dynamics of water molecules at air/water interface, investigated with Sum Frequency Generation Vibrational Spectroscopy (SFG-VS). Quantitative polarization and experimental configuration analysis of the SFG data in different polarizations with four sets of experimental configurations can shed new lights on our present understanding of the air/water interface. Firstly, we concluded that the motion of the interfacial water molecules can only be in a limited angular range, instead rapidly varying over a broad angular range in the vibrational relaxation time suggested previously. Secondly, because different vibrational modes of different molecular species at the interface has different symmetry properties, polarization and symmetry analysis of the SFG-VS spectral features can help assignment of the SFG-VS spectra peaks to different interfacial species. These analysis concluded that the narrow 3693cm −1 and broad 3550cm −1 peaks belong to C∞v symmetry, while the broad 3250cm −1 and 3450cm −1 peaks belong to the symmetric stretching modes with C2v symmetry. Thus, the 3693cm −1 peak is assigned to the free OH, the 3550cm −1 peak is assigned to the single hydrogen bonded OH stretching mode, and the 3250cm −1 and 3450cm −1 peaks are assigned to interfacial water molecules as two hydrogen donors for hydrogen bonding (with C2v symmetry), respectively. Thirdly, analysis of the SFG-VS spectra concluded that the singly hydrogen bonded water molecules at the air/water interface have their dipole vector direct almost parallel to the interface, and is with a very narrow orientational distribution. The doubly hydrogen bond donor water molecules have their dipole vector point away from the liquid phase.

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Sum frequency generation (SFG) - surface vibrational spectroscopy studies of buried interfaces: catalytic reaction intermediates on transition metal crystal surfaces at high reactant pressures; polymer surface structures at the solid-gas and solid-liquid interfaces

Abstract: Sum frequency generation (SFG)-Surface vibrational spectroscopy studies of buried interfaces: Catalytic reaction intermediates on transition metal crystal surfaces at high reactant pressures; Polymer surface structures at the solid-gas and solid-li...

Cited by 58 publications

References 41 publications

Investigating buried polymer interfaces using sum frequency generation vibrational spectroscopy

Investigating buried polymer interfaces using sum frequency generation vibrational spectroscopy

Molecular Chemical Structure on Poly(methyl methacrylate) (PMMA) Surface Studied by Sum Frequency Generation (SFG) Vibrational Spectroscopy

Polarization and experimental configuration analyses of sum frequency generation vibrational spectra, structure, and orientational motion of the air/water interface

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