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Memory effects in annealed hybrid gold nanoparticles/block copolymer bilayers.

Torrisi V, Ruffino F, Licciardello A, Grimaldi MG, Marletta G - Nanoscale Res Lett (2011)

Bottom Line: The effect of the polymer chain mobility onto the organization of gold nanoparticle layer was assessed by heating the obtained hybrid PnBuA-b-PAA/Au NPs bilayer at T >Tg.The nanoparticles' distribution onto the different copolymer domains was found strongly affected by the annealing treatment, showing a peculiar memory effect, which modifies the AFM phase response of the Au NPs layer onto the polar domains, without affecting their surfacial composition.The effect is discussed in terms of the peculiar morphological features induced by enhanced mobility of polymer chains on the Au NPs layer.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory for Molecular Surfaces and Nanotechnology (LAMSUN), Department of Chemical Sciences, University of Catania and CSGI, Viale A, Doria 6, 95125, Catania, Italy. vanna.torrisi@gmail.com.

ABSTRACT
We report on the use of the self-organization process of sputtered gold nanoparticles on a self-assembled block copolymer film deposited by horizontal precipitation Langmuir-Blodgett (HP-LB) method. The morphology and the phase-separation of a film of poly-n-butylacrylate-block-polyacrylic acid (PnBuA-b-PAA) were studied at the nanometric scale by using atomic force microscopy (AFM) and Time of Flight Secondary Ion Mass Spectrometry (TOF-SIMS). The templating capability of the PnBuA-b-PAA phase-separated film was studied by sputtering gold nanoparticles (NPs), forming a film of nanometric thickness. The effect of the polymer chain mobility onto the organization of gold nanoparticle layer was assessed by heating the obtained hybrid PnBuA-b-PAA/Au NPs bilayer at T >Tg. The nanoparticles' distribution onto the different copolymer domains was found strongly affected by the annealing treatment, showing a peculiar memory effect, which modifies the AFM phase response of the Au NPs layer onto the polar domains, without affecting their surfacial composition. The effect is discussed in terms of the peculiar morphological features induced by enhanced mobility of polymer chains on the Au NPs layer.

No MeSH data available.


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ToF SIMS chemical maps of each deposition step of as deposited and annealed samples: (a) TOF-SIMS chemical maps of the HP-LB film of PnBuA-b-PAA; (b) TOF-SIMS chemical maps of the HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering; (c) TOF-SIMS chemical maps of the annealed bilayer (115°C, 15 min) composed by HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering.
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Figure 4: ToF SIMS chemical maps of each deposition step of as deposited and annealed samples: (a) TOF-SIMS chemical maps of the HP-LB film of PnBuA-b-PAA; (b) TOF-SIMS chemical maps of the HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering; (c) TOF-SIMS chemical maps of the annealed bilayer (115°C, 15 min) composed by HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering.

Mentions: Figure 4a refers to TOF-SIMS chemical maps of layer obtained at air/water interface and deposited on SiO2/Si substrate. Figure 4b refers to TOF-SIMS chemical maps of the annealed bilayer composed by HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering. The presence of gold film anneals phase difference of the hybrid bilayers.


Memory effects in annealed hybrid gold nanoparticles/block copolymer bilayers.

Torrisi V, Ruffino F, Licciardello A, Grimaldi MG, Marletta G - Nanoscale Res Lett (2011)

ToF SIMS chemical maps of each deposition step of as deposited and annealed samples: (a) TOF-SIMS chemical maps of the HP-LB film of PnBuA-b-PAA; (b) TOF-SIMS chemical maps of the HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering; (c) TOF-SIMS chemical maps of the annealed bilayer (115°C, 15 min) composed by HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211219&req=5

Figure 4: ToF SIMS chemical maps of each deposition step of as deposited and annealed samples: (a) TOF-SIMS chemical maps of the HP-LB film of PnBuA-b-PAA; (b) TOF-SIMS chemical maps of the HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering; (c) TOF-SIMS chemical maps of the annealed bilayer (115°C, 15 min) composed by HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering.
Mentions: Figure 4a refers to TOF-SIMS chemical maps of layer obtained at air/water interface and deposited on SiO2/Si substrate. Figure 4b refers to TOF-SIMS chemical maps of the annealed bilayer composed by HP-LB film of PnBuA-b-PAA covered with Au nanoparticles deposited by sputtering. The presence of gold film anneals phase difference of the hybrid bilayers.

Bottom Line: The effect of the polymer chain mobility onto the organization of gold nanoparticle layer was assessed by heating the obtained hybrid PnBuA-b-PAA/Au NPs bilayer at T >Tg.The nanoparticles' distribution onto the different copolymer domains was found strongly affected by the annealing treatment, showing a peculiar memory effect, which modifies the AFM phase response of the Au NPs layer onto the polar domains, without affecting their surfacial composition.The effect is discussed in terms of the peculiar morphological features induced by enhanced mobility of polymer chains on the Au NPs layer.

View Article: PubMed Central - HTML - PubMed

Affiliation: Laboratory for Molecular Surfaces and Nanotechnology (LAMSUN), Department of Chemical Sciences, University of Catania and CSGI, Viale A, Doria 6, 95125, Catania, Italy. vanna.torrisi@gmail.com.

ABSTRACT
We report on the use of the self-organization process of sputtered gold nanoparticles on a self-assembled block copolymer film deposited by horizontal precipitation Langmuir-Blodgett (HP-LB) method. The morphology and the phase-separation of a film of poly-n-butylacrylate-block-polyacrylic acid (PnBuA-b-PAA) were studied at the nanometric scale by using atomic force microscopy (AFM) and Time of Flight Secondary Ion Mass Spectrometry (TOF-SIMS). The templating capability of the PnBuA-b-PAA phase-separated film was studied by sputtering gold nanoparticles (NPs), forming a film of nanometric thickness. The effect of the polymer chain mobility onto the organization of gold nanoparticle layer was assessed by heating the obtained hybrid PnBuA-b-PAA/Au NPs bilayer at T >Tg. The nanoparticles' distribution onto the different copolymer domains was found strongly affected by the annealing treatment, showing a peculiar memory effect, which modifies the AFM phase response of the Au NPs layer onto the polar domains, without affecting their surfacial composition. The effect is discussed in terms of the peculiar morphological features induced by enhanced mobility of polymer chains on the Au NPs layer.

No MeSH data available.


Related in: MedlinePlus