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Thermoresponsive gold nanoshell@mesoporous silica nano-assemblies: an XPS/NMR survey

Thermoresponsive gold nanoshell@mesoporous silica nano-assemblies: an XPS/NMR survey
Thermoresponsive gold nanoshell@mesoporous silica nano-assemblies: an XPS/NMR survey
This work provides a detailed study on the physico-chemical characterization of a mechanized silver–gold alloy@mesoporous silica shell/pseudorotaxane nano-assembly using two main complementary techniques: XPS and NMR (liquid- and solid-state). The pseudorotaxane nanovalve is composed of a stalk (N-(6-aminohexyl)-aminomethyltriethoxysilane)/macrocycle (cucurbit[6]uril (CB6)) complex anchored to the silica shell leading to a silica/nanovalve hybrid organic–inorganic interface that has been fully characterized. The stalk introduction in the silica network was clearly demonstrated by XPS measurements, with the Si 2p peak shifting to lower energy after grafting, and through the analysis of the C 1s and N 1s core peaks, which indicated the presence of CB6 on the nanoparticle surface. For the first time, the complex formation on nanoparticles was proved by high speed 1H MAS NMR experiments. However, these solid state NMR analyses have shown that the majority of the stalk does not interact with the CB6 macrocycle when formulated in powder after removing the solvent. This can be related to the large number of possible organizations and interactions between the stalk, the CB6 and the silica surface. These results highlight the importance of using a combination of adapted and complementary highly sensitive surface and volume characterization techniques to design tailor-made hybrid hierarchical structured nano-assemblies with controlled and efficient properties for potential biological purposes.
1463-9076
28719-28728
Soule, S.
f5b1ff97-bf20-4adb-ba1d-357254158d8f
Allouche, J.
b8291762-b02d-438b-8df4-d95eb0c127c8
Dupin, J.-C.
c5b50ce0-8278-4e9b-99d0-b8c3e7335dd0
Courrèges, C.
42acbb15-7a50-4797-96f9-441c670669e4
Plantier, F.
2cdebe4f-527b-4467-b9d8-cda51b1068b6
Ojo, W.-S.
7ec5313d-e583-4dc8-bcf8-a70feea60558
Coppel, Y.
4048a964-53e0-46e0-b9d7-026d0fec67b3
Nayral, C.
887fabc8-bf2c-4364-b7c8-a1db65519f62
Delpech, F.
d489de62-b59e-4156-9756-7df78a6ff0e2
Martinez, H.
97856576-ee09-4b7a-bdb4-2ce649ac2dac
Soule, S.
f5b1ff97-bf20-4adb-ba1d-357254158d8f
Allouche, J.
b8291762-b02d-438b-8df4-d95eb0c127c8
Dupin, J.-C.
c5b50ce0-8278-4e9b-99d0-b8c3e7335dd0
Courrèges, C.
42acbb15-7a50-4797-96f9-441c670669e4
Plantier, F.
2cdebe4f-527b-4467-b9d8-cda51b1068b6
Ojo, W.-S.
7ec5313d-e583-4dc8-bcf8-a70feea60558
Coppel, Y.
4048a964-53e0-46e0-b9d7-026d0fec67b3
Nayral, C.
887fabc8-bf2c-4364-b7c8-a1db65519f62
Delpech, F.
d489de62-b59e-4156-9756-7df78a6ff0e2
Martinez, H.
97856576-ee09-4b7a-bdb4-2ce649ac2dac

Soule, S., Allouche, J., Dupin, J.-C., Courrèges, C., Plantier, F., Ojo, W.-S., Coppel, Y., Nayral, C., Delpech, F. and Martinez, H. (2015) Thermoresponsive gold nanoshell@mesoporous silica nano-assemblies: an XPS/NMR survey. Physical Chemistry Chemical Physics, 17 (43), 28719-28728. (doi:10.1039/c5cp04491j).

Record type: Article

Abstract

This work provides a detailed study on the physico-chemical characterization of a mechanized silver–gold alloy@mesoporous silica shell/pseudorotaxane nano-assembly using two main complementary techniques: XPS and NMR (liquid- and solid-state). The pseudorotaxane nanovalve is composed of a stalk (N-(6-aminohexyl)-aminomethyltriethoxysilane)/macrocycle (cucurbit[6]uril (CB6)) complex anchored to the silica shell leading to a silica/nanovalve hybrid organic–inorganic interface that has been fully characterized. The stalk introduction in the silica network was clearly demonstrated by XPS measurements, with the Si 2p peak shifting to lower energy after grafting, and through the analysis of the C 1s and N 1s core peaks, which indicated the presence of CB6 on the nanoparticle surface. For the first time, the complex formation on nanoparticles was proved by high speed 1H MAS NMR experiments. However, these solid state NMR analyses have shown that the majority of the stalk does not interact with the CB6 macrocycle when formulated in powder after removing the solvent. This can be related to the large number of possible organizations and interactions between the stalk, the CB6 and the silica surface. These results highlight the importance of using a combination of adapted and complementary highly sensitive surface and volume characterization techniques to design tailor-made hybrid hierarchical structured nano-assemblies with controlled and efficient properties for potential biological purposes.

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Accepted/In Press date: 28 September 2015
e-pub ahead of print date: 28 September 2015
Published date: 21 November 2015
Organisations: Chemistry

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Local EPrints ID: 403254
URI: http://eprints.soton.ac.uk/id/eprint/403254
ISSN: 1463-9076
PURE UUID: c0f9b794-4d79-494d-8934-5ed493a62802

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Date deposited: 29 Nov 2016 11:20
Last modified: 28 Oct 2020 18:03

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Contributors

Author: S. Soule
Author: J. Allouche
Author: J.-C. Dupin
Author: C. Courrèges
Author: F. Plantier
Author: W.-S. Ojo
Author: Y. Coppel
Author: C. Nayral
Author: F. Delpech
Author: H. Martinez

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