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231223s2006 xx ||||| 00| ||eng c |
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|a pubmed25n0533.xml
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|a (DE-627)NLM159997453
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|a (NLM)16401135
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Sun, Yuan
|e verfasserin
|4 aut
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| 245 |
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|a Characterization of palladium nanoparticles by using X-ray reflectivity, EXAFS, and electron microscopy
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| 264 |
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|c 2006
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 25.06.2007
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|a Date Revised 10.01.2006
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a We compared the characteristics of dodecanethiolate palladium nanoparticles synthesized by two different techniques, a one-phase method and a two-phase method. From transmission electron microscopy (TEM), we determined that the particle sizes were 46 +/- 10 angstroms and 20 +/- 5 angstroms for the one- and two-phase particles, respectively. Electron diffraction confirmed that their structure was face-centered cubic (fcc). The lattice constant a0 was 3.98 +/- 0.01 angstroms and 3.90 +/- 0.01 angstroms for the one- and two-phase particles, respectively. High-resolution TEM (HRTEM) showed that the one-phase particles had an ordered core surrounded by a disordered shell structure, while the two-phase particles appeared to be crystalline throughout. The particles were also analyzed with extended X-ray absorption fine structure (EXAFS). A cuboctahedral fcc model was used to fit the data, which implied particle sizes of less than 10 angstroms for both the one- and two-phase particles. The discrepancy between the two techniques was attributed to the presence of a disordered phase, which we presumed was composed of Pd-S compounds. Compared with the bulk palladium, lattice expansion was observed in both one- and two-phase particles by electron diffraction, HRTEM, and EXAFS. At the air/water interface, a uniform film that produced surface pressure/area isotherms could only be obtained from the two-phase particles. The one-phase particles did not wet the water surface. X-ray reflectivity data indicated that the Langmuir monolayer of the two-phase particles was only 13 angstroms thick. TEM revealed the diameter of the particles in this layer to be 23 angstroms; hence the particles assumed an oblate structure after spreading. EXAFS examination of a stack of 750 Langmuir monolayers indicated far fewer Pd-S compounds, which may have dissolved in the water. The data were consistent with a model of a monolayer of truncated cuboctahedron Pd particles that were 7 angstroms thick and 19 angstroms in diameter
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|a Journal Article
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|a Frenkel, Anatoly I
|e verfasserin
|4 aut
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|a Isseroff, Rebecca
|e verfasserin
|4 aut
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|a Shonbrun, Cheryl
|e verfasserin
|4 aut
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|a Forman, Michelle
|e verfasserin
|4 aut
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|a Shin, Kwanwoo
|e verfasserin
|4 aut
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| 700 |
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|a Koga, Tadanori
|e verfasserin
|4 aut
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| 700 |
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|a White, Henry
|e verfasserin
|4 aut
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|a Zhang, Lihua
|e verfasserin
|4 aut
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|a Zhu, Yimei
|e verfasserin
|4 aut
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|a Rafailovich, Miriam H
|e verfasserin
|4 aut
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|a Sokolov, Jonathan C
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1985
|g 22(2006), 2 vom: 17. Jan., Seite 807-16
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnas
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| 773 |
1 |
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|g volume:22
|g year:2006
|g number:2
|g day:17
|g month:01
|g pages:807-16
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