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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1021/la5047244
|2 doi
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|a pubmed24n0820.xml
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|a eng
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| 100 |
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|a Bashouti, Muhammad Y
|e verfasserin
|4 aut
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|a Role of silicon nanowire diameter for alkyl (chain lengths C₁-C₁₈) passivation efficiency through Si-C bonds
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|c 2015
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 21.05.2015
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|a Date Revised 03.03.2015
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a The effect of silicon nanowire (Si NW) diameter on the functionalization efficiency as given by covalent Si-C bond formation is studied for two distinct examples of 25 ± 5 and 50 ± 5 nm diameters (Si NW25 and Si NW50, respectively). A two-step chlorination/alkylation process is used to connect alkyl chains of various lengths (C1-C18) to thinner and thicker Si NWs. The shorter the alkyl chain lengths, the larger the surface coverage of the two studied Si NWs. Increasing the alkyl chain length (C2-C9) changes the coverage on the NWs: while for Si NW25 90 ± 10% of all surface sites are covered with Si-C bonds, only 50 ± 10% of all surface sites are covered with Si-C bonds for the Si NW50 wires. Increasing the chain length further to C14-C18 decreases the alkyl coverage to 36 ± 6% in thin Si NW25 and to 20 ± 5% in thick Si NW50. These findings can be interpreted as being a result of increased steric hindrance of Si-C bond formation for longer chain lengths and higher surface energy for the thinner Si NWs. As a direct consequence of these findings, Si NW surfaces have different stabilities against oxidation: they are more stable at higher Si-C bond coverage, and the surface stability was found to be dependent on the Si-C binding energy itself. The Si-C binding energy differs according to (C1-9)-Si NW > (C14-18)-Si NW, i.e., the shorter the alkyl chain, the greater the Si-C binding energy. However, the oxidation resistance of the (C2-18)-Si NW25 is lower than for equivalent Si NW50 surfaces as explained and experimentally substantiated based on electronic (XPS and KP) and structure (TEM and HAADF) measurements
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|a Journal Article
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|a Garzuzi, Carmelina A
|e verfasserin
|4 aut
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1 |
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|a de la Mata, Maria
|e verfasserin
|4 aut
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|a Arbiol, Jordi
|e verfasserin
|4 aut
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|a Ristein, Jürgen
|e verfasserin
|4 aut
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|a Haick, Hossam
|e verfasserin
|4 aut
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| 700 |
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|a Christiansen, Silke
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 31(2015), 8 vom: 03. März, Seite 2430-7
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:31
|g year:2015
|g number:8
|g day:03
|g month:03
|g pages:2430-7
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|u http://dx.doi.org/10.1021/la5047244
|3 Volltext
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