tailieunhanh - Báo cáo hóa học: " “Soft and rigid” dithiols and Au nanoparticles grafting on plasma-treated polyethyleneterephthalate"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : “Soft and rigid” dithiols and Au nanoparticles grafting on plasma-treated polyethyleneterephthalate | Svorcík et al. Nanoscale Research Letters 2011 6 607 http content 6 1 607 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Soft and rigid dithiols and Au nanoparticles grafting on plasma-treated polyethyleneterephthalate 1 2 1 1 1 3 Václav Svorcík Zdenka Kolská Ondrej Kvítek Jakub Siegel Alena Reznickova Pavel Rezanka and Kamil Záruba3 Abstract Surface of polyethyleneterephthalate PET was modified by plasma discharge and subsequently grafted with dithiols 1 2-ethanedithiol ED or 4 4 -biphenyldithiol to create the thiol -SH groups on polymer surface. This short dithiols are expected to be fixed via one of -SH groups to radicals created by the plasma treatment on the PET surface. Free -SH groups are allowed to interact with Au nanoparticles. X-ray photoelectron spectroscopy XPS Fourier transform infrared spectroscopy FTIR and electrokinetic analysis EA zeta potential were used for the characterization of surface chemistry of the modified PET. Surface morphology and roughness of the modified PET were studied by atomic force microscopy AFM . The results from XPS FTIR EA and AFM show that the Au nanoparticles are grafted on the modified surface only in the case of biphenyldithiol pretreatment. The possible explanation is that the flexible molecule of ethanedithiol is bounded to the activated PET surface with both -SH groups. On the contrary the rigid molecule of biphenyldithiol is bounded via only one -SH group to the modified PET surface and the second one remains free for the consecutive chemical reaction with Au nanoparticle. The gold nanoparticles are distributed relatively homogenously over the polymer surface. Keywords PET plasma treatment dithiols and gold nanoparticles grafting XPS FTIR zeta potential AFM Introduction The long-term research field of our scientific group is the modification of polymer surfaces . preparation of chemically active groups or species . radicals conjugated double bonds oxygen .