FEATURES OF SILVER DEPOSITION IN POROUS SILICON BY ELECTRO-THERMAL DIFFUSION METHOD

• Main Authors: Koshevoi Veniamin L., Belorus Anton O., Matyushkin Lev B., Pleshanov Ilya M., SeredinPavel V., Ivkov Sergey A., Lenshin Alexander S.
• Format: Article
• Language: English
• Published: Voronezh State University 2019-09-01
• Series: Конденсированные среды и межфазные границы
• Subjects: silicon; porous silicon; composite structures; functionalization; electro-thermal diffusion; wetting angle.
• Online Access: https://journals.vsu.ru/kcmf/article/view/1158

Purpose. In this work, we investigated the possibility of modifying porous silicon with silver particles. Methods and methodology. For the synthesis of substrates was used the method of electrochemical etching in hydrofl uoric acid solutions. Аt given technological parameters was formed a porous matrix. The resulting samples were subjected to further functionalization. For the synthesis of silver ink AgNO3 was used the method of colloidal quantum dots and then by the method of electro-thermal diffusion, these particles were deposited in a porous matrix to forming a composite structure. To study the samples was used by scanning electron microscopy. Morphology and diffusion processes were studied using SEM data. To control the functionalization process was used the method of determining the wetting angle. Results. Using the method of centrifugation, a silver layer was deposited on a porous silicon matrix. According to SEM data, it was established that the pore size is d = 50-100 nm, the layer thickness is 25 μm. Base on wetting angle data was concluded that the porous silicon matrix is initially hydrophobic (q ≈ 59°). After the deposition of silver particles, the hydrophobicity changes to hydrophilicity (q ≈ 31°) and further electrothermal effects have little effect on the wetting angle and the nature of hydrophilicity (q ≈ 42°). Conclusion. As a result of research work demonstrated the effectiveness of the electro-thermal methods for introducing silver into the porous silica matrix. It shows that the deposition of silver leads to a decrease in the hydrophobicity of the surface.