Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Memory effects in annealed hybrid gold nanoparticles/block copolymer bilayers | Torrisi et al. Nanoscale Research Letters 2011 6 167 http content 6 1 167 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Memory effects in annealed hybrid gold nanoparticles block copolymer bilayers -I- 1 2 1 2 1 Vanna Torrisi Francesco Ruffino Antonino Licciardello Maria Grazia Grimaldi Giovanni Marietta 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. Introduction Recent advances in the patterning of polymers have enabled the fabrication of integrated micro- and nanosystems with high degree of complexity and functionality. For example block copolymers have attracted immense interest for nanotechnology applications because of easy processability and low-cost fabrications. The chemically distinct and immiscible polymer blocks in block copolymers microphase-separate and selfassemble
