Рік видавництва: 2019
Рік видавництва: 2019
Affect of phthalocyanine lutetium on the optical properties of silicon carbide nanoparticles
V. Krasovskii1, S. Rasmagin1, L. Apresyan1, T. Vlasova1, V. Pustovoy1
1Prokhorov General physics institute of RAS, Laser Physics, Moscow, Russian Federation
Silicon carbide is widely used in electronic devices operating at high temperatures, in the high frequency range, or at high power . In addition to a deep study of bulk monocrystalline silicon carbide, more and more research is being conducted into the properties of silicon carbide nanoparticles (nSiC), which may reveal new applications of silicon carbide (SiC). In this work, we studied the optical properties (namely, absorption spectra) of an nSiC solution surrounded by lutetium diphthalocyanine (LuPc2) molecules in order to determine the mutual influence on their properties and the possible use of the nSiC + LuPc2 solution as components of the Gretzel cell. Control and mixed solutions of nSiC + LuPc2 in tetrahydrofuran (THF) solvent were prepared: 1-LuPc2 + THF 2 ml, 2 - LuPc2 + THF 1.5 ml + nSiC + THF 0.5 ml, 3 - LuPc2 + THF 1 ml + nSiC + THF 1 ml, 4 - LuPc2 + THF 0.5 ml + nSiC + THF 1.5 ml and 5 - nSiC + THF 2 ml. The size of nanoparticles of silicon carbide was about 20 nm. The absorption spectra of these solutions are obtained, see Fig.1. Analyzing Fig.1, the following peak were detected: Xm = 656 nm (Q-band) Lu LuPc2, Xm = 340 nm (B-band) LuPc2 and Xm = 366 nm for nSiC . For nanoparticles of silicon carbide, the band gap is 3.38 eV, which corresponds to the 2H-SiC polytype.
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Fig.1. Absorption spectra of solutions 1 LuPc2 + THF 2 ml, 2 - LuPc2 + THF 1.5 ml + nSiC + THF 0.5 ml, 3 -LuPc2 + THF 1 ml + nSiC + THF 1 ml, 4 - LuPc2 + THF 0.5 ml + nSiC + THF 1.5 ml and 5 - nSiC + THF 2 ml.
A study was made effect of the concentration diphthalocyanine lutetium molecules (n - n * electronic transitions) on the absorption spectra of silicon carbide nanoparticles (electron - hole recombination). It was found that with an increase in the concentration diphthalocyanine lutetium, the amplitude of the absorption spectrum of nSiC increases, which can be explained by the additional absorption on LuPc2 molecules due to the proximity of the absorption maxima. Thus, it is possible to choose such a metal phthalocyanine whose B-band falls into resonance with the band gap of silicon carbide nanoparticles and thereby increase the absorption by nSiC by an order of magnitude. The following results were obtained: in the resulting solutions, by changing the
concentration of diphthalocyanine lutetium, the absorption on silicon carbide nanoparticles was increased.
This work was supported by Russan Foundation of Basic Research Grant No 18-02-00786 and Program of RAS presidium I.7P.
 Abderrazak H., Hmida E.S. Silicon Carbide: Synthesis and Properties in Properties and Applications of Silicon Carbide, Edited by R. Gerhardt. InTech, Janeza Trdine, pp. 361-388 (2011).
 Borisov A.V., Korel'Chuk M.V., Galanin N.E., Shaposhnikov G.P. Sandwich complexes of lutetium with tetraanthraquinoneporphyrazine and asymmetric alkoxy-substituted phthalocyanines. Preparation and spectral properties, Russian Journal of General Chemistry, 84 (5) 953-959 (2014).
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