NANOSTRUCTURED LAYERS AND LANGMUIR-SCHAEFER FILMS OF TETRAPHENYLPORPHINE

Vu, Thi Thao (2021) NANOSTRUCTURED LAYERS AND LANGMUIR-SCHAEFER FILMS OF TETRAPHENYLPORPHINE. In: Eleventh International Conference on Porphyrins and Phthalocyanines (ICPP-11), 28/06-03/07/2021.

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Abstract

This work aimed to obtain stable nanostructured floating monolayers and thin films of tetraphenylporphin (H2TPP) by the Langmuir-Schaefer (LS) method. The layer structure was analyzed within the framework of the model of a nanostructured M-monolayer using a quantitative method for analyzing compression isotherms [1-4]. The obtained LS films were examined by electron absorption spectroscopy (Fig. 1a) and electron microscopy (SEM) (Fig. 1b). (a) (b) Fig. 1. (a) UV-vis spectra of a solution of H2TPP in CH2Cl2 (red) and its LS-films (49 layers, black). On the UV-vis insert, the spectra of films of various thicknesses (2-49 layers); (b) SEM image of LS-film H2TPP. It was found that H2TPP at the water-air interface at different initial degrees of surface coverage (cface) forms nanostructured edge-on monolayers. The main characteristics of the layers are determined. It was shown that H2TPP forms two-dimensional nanostructures of a very large size - about 60 nm in diameter. In LS-films, these nanostructures are combined into even larger ones - the average diameter is about 250 nm (Fig. 1b). The spectra of Н2ТРР LS films are characterized by a strong bathochromic shift of the Soret band (by 21 nm) and Q-bands (by 4-6 nm) relative to the spectrum of the solution (Fig. 1a), which indicates the formation of J-type nanoaggregates.

Item Type:	Conference or Workshop Item (Poster)
Subjects:	ISI/Scopus indexed conference
Divisions:	Faculty of Engineering Physics and Nanotechnology (FEPN)
Depositing User:	Mrs Thi Thao Vu
Date Deposited:	21 Jun 2021 07:07
Last Modified:	21 Jun 2021 07:07
URI:	http://eprints.uet.vnu.edu.vn/eprints/id/eprint/4497

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