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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.

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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.


Nanometric scale AFM images of each deposition step of as deposited and annealed samples: (a) AFM images in detail (around micelles) of PnBuA-b-PAA film; (b) AFM images of gold nanoparticles after sputtering deposition, inset: Gaussian distribution of gold nanoparticles' size (height). (c) AFM image in detail of annealed (115°C, 15 min) hybrid bilayer with evidence of the modification of gold film nanostructures.
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Figure 5: Nanometric scale AFM images of each deposition step of as deposited and annealed samples: (a) AFM images in detail (around micelles) of PnBuA-b-PAA film; (b) AFM images of gold nanoparticles after sputtering deposition, inset: Gaussian distribution of gold nanoparticles' size (height). (c) AFM image in detail of annealed (115°C, 15 min) hybrid bilayer with evidence of the modification of gold film nanostructures.

Mentions: Gold nanoparticles layer, shown in AFM images of Figure 5, are characterized by a specific value of height (z = 3.3 nm) obtained with accurate experimental conditions of sputtering deposition. From the AFM images the Au NPs height distributions were determined by using a software (Nanoscope IIIa) that define each nanocluster area by the surface image sectioning of a plane that was positioned at half cluster height. The height distribution (Figure 5b inset) of the Au NPs was obtained on a statistical population of 100 NPs.


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

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

Nanometric scale AFM images of each deposition step of as deposited and annealed samples: (a) AFM images in detail (around micelles) of PnBuA-b-PAA film; (b) AFM images of gold nanoparticles after sputtering deposition, inset: Gaussian distribution of gold nanoparticles' size (height). (c) AFM image in detail of annealed (115°C, 15 min) hybrid bilayer with evidence of the modification of gold film nanostructures.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Nanometric scale AFM images of each deposition step of as deposited and annealed samples: (a) AFM images in detail (around micelles) of PnBuA-b-PAA film; (b) AFM images of gold nanoparticles after sputtering deposition, inset: Gaussian distribution of gold nanoparticles' size (height). (c) AFM image in detail of annealed (115°C, 15 min) hybrid bilayer with evidence of the modification of gold film nanostructures.
Mentions: Gold nanoparticles layer, shown in AFM images of Figure 5, are characterized by a specific value of height (z = 3.3 nm) obtained with accurate experimental conditions of sputtering deposition. From the AFM images the Au NPs height distributions were determined by using a software (Nanoscope IIIa) that define each nanocluster area by the surface image sectioning of a plane that was positioned at half cluster height. The height distribution (Figure 5b inset) of the Au NPs was obtained on a statistical population of 100 NPs.

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.