Study of porosity of nanostructured silicon films
Anastasiya A. Fronya1,2, Egor I. Mavreshko1,2, Mariya S. Grigoryeva1,2, Irina N. Zavestovskaya1,2,3, Ivan M. Tupitsyn1, Alexander M. Tupitsyn1
1- P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy Prospekt, Moscow 199991, Russian Federation
2- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 31 Kashirskoe shosse, Moscow 115409, Russian Federation
3- National Research Center «Kurchatov Institute»,1 Academician Kurchatov Square, Moscow 123182, Russian Federation
Abstract
Nanostructured materials are actively introduced into practice to solve various problems in biomedicine: vector delivery of drugs, biovisualization, local hyperthermia, etc. [1]. The porosity of the material determines what substance can be loaded into it, in what quantity, and how quickly the material itself will dissolve. Porous nanomaterials are quite complex in terms of studying their properties, since most often the impact on such a sample can lead to its destruction. Therefore, it is necessary to develop approaches to studying and controlling the properties of porous nanomaterials that can avoid destruction and changes in their properties.
In this work, experimental studying of the porosity of nanostructured silicon films wase carried out. Film synthesis was performed by electrochemical etching in hydrofluoric acid. The porosity of the obtained silicon films was assessed based on work [2]. Then, the porosity of the films was determined by an optical method based on registration of a low-intensity laser radiation signal reflected from the sample. The method used allowed determining the porosity of silicon films without destroying them. A comparison of experimental data on determining porosity by an optical method and porosity assessment based on synthesis conditions showed good agreement.
1. I. Roy, S. Krishnan, A.V. Kabashin, I.N. Zavestovskaya, P.N. Prasad. Transforming Nuclear Medicine with Nanoradiopharmaceuticals. ACS Nano 2022, 16, 4, 5036–5061.
2. Novikov V.B. Linear and nonlinear optical effects in photonic crystals with Bragg diffraction in Laue geometry. Dissertation for the degree of candidate of physical and mathematical sciences. Moscow State University. 2017. (In Russ.)
Speaker
Anastasiya Fronya
P. N. Lebedev Physical Institute of the Russian Academy of Sciences
Russia
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