Ionic self-assembly of porphyrin nanostructures on the surface of charge-altered track-etched membranes

被引:10
作者
Mongwaketsi, Nametso [2 ,3 ]
Ndungu, Patrick G. [1 ]
Nechaev, Alexander [2 ]
Maaza, Malik [2 ]
Sparrow, Raymond [3 ]
机构
[1] Univ Western Cape, Environm & Nanosci Res Grp, Dept Chem, Cape Town, South Africa
[2] MRG, iThemba LABS, Somerset W Cape Town, South Africa
[3] Council Sci & Ind Res CSIR, Tshwane, South Africa
基金
新加坡国家研究基金会;
关键词
porphyrin nanotubes; poly-(ethylene-terephthalate) track-etched membranes; self-assembly; consolidated nanomaterial; UV-vis spectroscopy; atomic force microscopy; NANOTUBES; NANOMATERIALS; C-60;
D O I
10.1142/S1088424610002276
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Track-etched polymer membranes are typically used as templates in the synthesis of various nanowires or nanotubes arrays. The unique advantages of track-etched membranes, such as uniform pore structure, excellent porosity, easily tailored pore sizes, and a well characterized surface chemistry, may find use in self-assembly strategies where colloidal nanostructures can be tethered to a suitable substrate to produce devices of interest. Meso-tetrakis(4-phenylsulfonicacid)porphyrin dihydrochloride and Sn(IV) tetrakis(4-pyridyl)porphyrin were used to synthesize ionic self-assembled porphyrin nanorods. The track-etched membranes surface charge was changed from negative to positive using polyethyleneimine. The porphyrin nanorods were either filtered through or self-assembled onto the surface of track-etched membranes. Comparisons were made with track-etched membranes modified with, and without, poly ethyleneimine. Assembly of the porphyrin nanotubes only occurred on the surface of positively charged track-etched membranes, and filtration of the porphyrin nanorods produced a mesh-like structure on the surface of the membrane irrespective of the track-etched membrane pore diameter. In each case the characteristic absorbance profiles of the porphyrin nanorods was maintained. Transmission electron microscopy, scanning electron microscopy, atomic force microscopy, and UV-vis spectroscopy were used to characterize the various systems.
引用
收藏
页码:446 / 451
页数:6
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