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Design of hybrid nanomaterials based on silicaporphyrin. AFM characterization

E. FAGADAR-COSMA1,* , C. ENACHE1, GH. FAGADAR-COSMA2, C. SAVII1

Affiliation

  1. Institute of Chemistry –Timişoara of Romanian Academy, M. Viteazul Ave, No. 24, 300223-Timisoara, Romania
  2. "Politehnica" University, T. Lalescu Street, No. 2, 300223-Timisoara, Romania

Abstract

The present work describes some experimental studies regarding the obtaining and characterization of some new silicaporphyrin hybrid nanomaterials. A few experiments regarding porphyrin immobilization into silica matrix, based on tetraethoxysilane and tetramethoxysilane, by using different sol-gel techniques: in situ, by impregnation and by using sonication, are presented. The used para-hydroxyphenyl substituted porphyrin, namely: 5,10,15,20-tetrakis(4- hydroxyphenyl)-21H,23H-porphine, was isolated and purified by TLC, and column chromatography, after performing an Adler condensation reaction. The functional porphyrin was characterized by 1H-NMR, MS, FT-IR and UV-vis spectrometry and the silica-porphyrin hybrid generations were monitored by AFM and UV-vis spectrometry. High-resolution imaging, using atomic force microscopy (AFM), has been applied to directly observe the surface structures which are formed by immobilization of porphyrins on the surfaces. AFM features show that nanocluster porphyrin stacks of various heights were formed on silica surfaces. It may be possible to affirm that the assembly of porphyrins was directed into a co-planar, stacked orientation. AFM images show that the porphyrin stacks do not merge more than two together. Cursor measurements indicate that the columnar stacks have variable heights, ranging from 2.4 to 18.5 nm..

Keywords

Porphyrin, silica matrix, Hybrid silica-porphyrin nanostructures, AFM, UV-vis.

Submitted at: Jan. 9, 2007
Accepted at: June 15, 2007

Citation

E. FAGADAR-COSMA, C. ENACHE, GH. FAGADAR-COSMA, C. SAVII, Design of hybrid nanomaterials based on silicaporphyrin. AFM characterization, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1878-1882 (2007)