Ag clusters electrochemically reduced in stearic acid Langmuir-Blodgett films and their structural characterizations
Silver ions confined in the silver stearate Langmuir-Blodgett (L-B) films of 8-14 layers were elec-trochernically reduced into Ag clusters,which made the observation of well-ordered scanning tunneling microscope (STM) images of the films with molecular resolution.A hexagonal packing of the hydrophob...
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| Published in | Science China. Chemistry Vol. 40; no. 4; pp. 397 - 404 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Heidelberg
Springer Nature B.V
01.08.1997
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-7291 1006-9291 0253-5831 1869-1870 1862-2771 |
| DOI | 10.1007/BF02877756 |
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| Abstract | Silver ions confined in the silver stearate Langmuir-Blodgett (L-B) films of 8-14 layers were elec-trochernically reduced into Ag clusters,which made the observation of well-ordered scanning tunneling microscope (STM) images of the films with molecular resolution.A hexagonal packing of the hydrophobic chains was obtained,which was superimposed on the two-dimensional Ag clusters of 2-3 nm m diameter.Furthermore,a (2×1) struc-time of the hexagonal packing was observed.It was attributed to a self-assembled structure of the hydrophilic surface of the L-B films through hydrogen bonding.The strong surface enhanced Raman scattering (SERS) effect of Ag clusters made it possible to record Raman spectra of two-layer steanc acid L-B films in the region of C-C stretching vibration frequencies The appearance of the bands at 1 128 0 and 1 100.7 cm-1,which correspond to the antisymmetric C-C stretching model of the acyl chains m the all-trans conformation and the C-C stretching model of the acyl chains in the gauche |
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| AbstractList | Silver ions confined in the silver stearate Langmuir-Blodgett (L-B) films of 8-14 layers were elec-trochernically reduced into Ag clusters,which made the observation of well-ordered scanning tunneling microscope (STM) images of the films with molecular resolution.A hexagonal packing of the hydrophobic chains was obtained,which was superimposed on the two-dimensional Ag clusters of 2-3 nm m diameter.Furthermore,a (2×1) struc-time of the hexagonal packing was observed.It was attributed to a self-assembled structure of the hydrophilic surface of the L-B films through hydrogen bonding.The strong surface enhanced Raman scattering (SERS) effect of Ag clusters made it possible to record Raman spectra of two-layer steanc acid L-B films in the region of C-C stretching vibration frequencies The appearance of the bands at 1 128 0 and 1 100.7 cm-1,which correspond to the antisymmetric C-C stretching model of the acyl chains m the all-trans conformation and the C-C stretching model of the acyl chains in the gauche Silver ions confined in the silver stearate Langmuir-Blodgett (L-B) films of 8–14 layers were electrochemically reduced into Ag clusters, which made the observation of well-ordered scanning tunneling microscope (STM) images of the films with molecular resolution. A hexagonal packing of the hydrophobic chains was obtained. which was superimposed on the two-dimensional Ag clusters of 2–3 nm in diameter. Furthermore, a (2×1) structure of the hexagonal packing was observed. It was attributed to a self-assembled structure of the hydrophilic surface of the L-B films through hydrogen bonding. The strong surface enhanced Raman scattering (SERS) effect of Ag clusters made it possible to record Raman spectra of twoiayer stearic acid L-B films in the region of C—C stretching vibration frequencies. The appearance of the bands at 1 128.0 and 1 100. 7 cm−1, which correspond to the antisymmetric C—C stretching model of the acyl chains in theall-trans conformation and the C—C stretching model of the acyl chains in thegauche conformations, respectively, means that the methylene chains are mainly inall-trans conformation, but some of them become disordered. |
| Author | 张韫宏 谢兆雄 华炳增 毛秉伟 陈衍珍 李前树 田昭武 |
| AuthorAffiliation | College of Chemtcal Engineerung and Material Science.Beijing Institute of Technology.Beijing 100081.China State Key Laboratory for Physical Chemistry of Solid Surfaces Department of Chemistry Xiamen University Xiamen 361005 China China |
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| Cites_doi | 10.1021/ja00071a089 10.1021/j100311a021 10.1016/0040-6090(94)90494-4 10.1016/0022-0728(89)85089-2 10.1021/la00067a017 10.1016/0009-2614(88)80169-6 10.1021/j100068a006 10.1063/1.443644 10.1021/j100186a072 10.1063/1.453686 |
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| Copyright | Science in China Press 1997. |
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| DOI | 10.1007/BF02877756 |
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| Notes | ZHANG Yunhong,XIE Zhaoxiong,HUA Bingzeng MAO Bingwei,CHEN Yanzhen,LI Qianshu and TIAN Zhaowu(State Key Laboratory for Physical Chemistry of Solid Surfaces,Department of Chemistry,Xiamen University,Xiamen 361005,China) 11-5839/O6 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 |
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| References | F. Kimura (BF02877756_CR9) 1986; 2 M. Harrand (BF02877756_CR11) 1987; 87 J. K. Pike (BF02877756_CR4) 1993; 115 W. Knoll (BF02877756_CR10) 1982; 77 L. Uchida (BF02877756_CR5) 1989; 266 F. C. Meldrum (BF02877756_CR1) 1994; 98 S. X. Ji (BF02877756_CR3) 1994; 242 C. P. Wagner (BF02877756_CR7) 1979 X. G. Peng (BF02877756_CR2) 1992; 96 J. K. H. Hober (BF02877756_CR8) 1988; 145 E. Sabatanl (BF02877756_CR6) 1987; 91 |
| References_xml | – volume: 115 start-page: 8497 issue: 18 year: 1993 ident: BF02877756_CR4 publication-title: J.Am.Chem.Soc. doi: 10.1021/ja00071a089 – volume: 91 start-page: 6663 issue: 27 year: 1987 ident: BF02877756_CR6 publication-title: J. Phys. Chem. doi: 10.1021/j100311a021 – volume: 242 start-page: 16 year: 1994 ident: BF02877756_CR3 publication-title: Thin Soltd Films doi: 10.1016/0040-6090(94)90494-4 – volume: 266 start-page: 455 year: 1989 ident: BF02877756_CR5 publication-title: J. Electrwnal. Chem. doi: 10.1016/0022-0728(89)85089-2 – volume-title: Handbook of X-ray Electron Spectroscopy year: 1979 ident: BF02877756_CR7 – volume: 2 start-page: 96 issue: 1 year: 1986 ident: BF02877756_CR9 publication-title: Langmuir doi: 10.1021/la00067a017 – volume: 145 start-page: 151 issue: 2 year: 1988 ident: BF02877756_CR8 publication-title: Chem. Phys. Lett. doi: 10.1016/0009-2614(88)80169-6 – volume: 98 start-page: 4506 year: 1994 ident: BF02877756_CR1 publication-title: J. Phys. Chem. doi: 10.1021/j100068a006 – volume: 77 start-page: 219 issue: 1 year: 1982 ident: BF02877756_CR10 publication-title: J. Chem. Phys. doi: 10.1063/1.443644 – volume: 96 start-page: 3170 issue: 7 year: 1992 ident: BF02877756_CR2 publication-title: J. Phys. Chem. doi: 10.1021/j100186a072 – volume: 87 start-page: 5176 issue: 9 year: 1987 ident: BF02877756_CR11 publication-title: J. Chem. Phys. doi: 10.1063/1.453686 |
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| Snippet | Silver ions confined in the silver stearate Langmuir-Blodgett (L-B) films of 8-14 layers were elec-trochernically reduced into Ag clusters,which made the... Silver ions confined in the silver stearate Langmuir-Blodgett (L-B) films of 8–14 layers were electrochemically reduced into Ag clusters, which made the... |
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| SubjectTerms | Bonding strength Clusters Diameters Hydrogen bonding Langmuir-Blodgett Langmuir-Blodgett films Molecular conformation Raman spectra Scanning tunneling microscopy Self-assembly SERS Silver SIM Stearic acid Stretching |
| Title | Ag clusters electrochemically reduced in stearic acid Langmuir-Blodgett films and their structural characterizations |
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