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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1021/la403407g
|2 doi
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|a DE-627
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|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Takei, Hiroyuki
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Enhanced infrared LSPR sensitivity of cap-shaped gold nanoparticles coupled to a metallic film
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|c 2014
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 20.10.2014
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|a Date Revised 05.03.2014
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We report on optical properties of gold deposited on SiO2 nanospheres randomly adsorbed on a thin gold layer. Extinction peaks with optical density of more than 2 are observed in the visible as well as near-IR regimes. The peak wavelength of the latter was affected exquisitely by the thickness of the top layer. A helium ion microscope (HIM) was used for careful observation of morphological transformation accompanying the change in the deposition thickness. Growth of grain structures into a capped-dimer structure was accompanied by slight blue-shift of the visible peak and significantly greater red-shift of the near-IR peak. Our finite-difference time-domain (FDTD) calculations show that these peaks in the visible and near-IR can be respectively attributed to dipole modes associated with transverse and longitudinal oscillations of free electrons in the gold-capped dimer. To investigate the refractive index sensitivity of these peaks, we used two approaches: immersion in solutions of varying refractive index and coating with an organic layer. With the first approach that characterizes the bulk sensitivity, the visible peak shows sensitivity of 122 nm/RIU, while the near-IR peak shifts at the rate of 506 nm/RIU. With the second approach that reflects the local sensitivity, the surface was saturated with alkaline phosphatase (ALP), whose subsequent reaction led to formation of a thin insoluble organic layer, causing a relatively small blue-shift, under 7 nm, of the visible peak and much larger red-shift, over 50 nm, of the near-IR peak when measured in buffer. When the same reaction was measured at end points in the air, the shift was as large as 444 nm for the near-IR peak
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|a Journal Article
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1 |
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|a Bessho, Noriyuki
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Ishii, Aira
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Okamoto, Takayuki
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Beyer, André
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Vieker, Henning
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Gölzhäuser, Armin
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1999
|g 30(2014), 8 vom: 04. März, Seite 2297-305
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:30
|g year:2014
|g number:8
|g day:04
|g month:03
|g pages:2297-305
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| 856 |
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|u http://dx.doi.org/10.1021/la403407g
|3 Volltext
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