Improvement of Heat Dissipation in Ag/Ni Substrates for Testing Cu-TiO<sub>2</sub>/TiO<sub>2</sub>-Modified Filters Using SERS Spectroscopy
Hanna Bandarenka,
Aliaksandr Burko,
Kseniya Girel,
Diana Laputsko,
Elizaveta Orel,
Anna Mizgailo,
Utkirjon Sharopov,
Alise Podelinska,
Uladzislau Shapel,
Vladimir Pankratov,
Sergei Piskunov,
Dmitry Bocharov
Affiliations
Hanna Bandarenka
Applied Plasmonics Laboratory, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
Aliaksandr Burko
Applied Plasmonics Laboratory, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
Kseniya Girel
Applied Plasmonics Laboratory, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
Diana Laputsko
Applied Plasmonics Laboratory, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
Elizaveta Orel
Applied Plasmonics Laboratory, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
Anna Mizgailo
Applied Plasmonics Laboratory, Belarusian State University of Informatics and Radioelectronics, 220013 Minsk, Belarus
Utkirjon Sharopov
“New Materials and Energy Accumulation” Laboratory, National Scientific Research Institute of Renewable Energy Sources, Ministry of Energy of the Republic of Uzbekistan, Tashkent 100084, Uzbekistan
Alise Podelinska
Institute of Solid State Physics, University of Latvia, LV-1063 Riga, Latvia
Uladzislau Shapel
Institute of Solid State Physics, University of Latvia, LV-1063 Riga, Latvia
Vladimir Pankratov
Institute of Solid State Physics, University of Latvia, LV-1063 Riga, Latvia
Sergei Piskunov
Institute of Solid State Physics, University of Latvia, LV-1063 Riga, Latvia
Dmitry Bocharov
Institute of Solid State Physics, University of Latvia, LV-1063 Riga, Latvia
Surface-enhanced Raman scattering (SERS) spectroscopy is used to investigate a composition of wash swabs from the Cu-TiO2/TiO2-modified filters with disinfecting ability. Macroporous Si chips coated with conformal 800 nm thick Ni layer and Ag particles (Ag/Ni) are engineered to act as SERS-active substrates. Such substrates are characterized by a moderate reflection band in the visible range and provide an improved heat dissipation from contaminants in wash swabs during SERS study. This prevents thermal-induced destruction of analyzing media for reliable assessment of its composition. The anatase Cu-TiO2 and TiO2 nanoparticles are synthesized using the sol-gel method and characterized via Raman spectroscopy and X-ray diffractometry. The filters are modified with Cu-TiO2/TiO2 nanoparticles and embedded in three-valve facial masks that are worn by a volunteer to breathe for 4 h. Comparative SERS analysis of the filters shows that they slightly destroy chemical bonds in the molecules constituting airborne contaminations upon ceiling day lights, which can be associated with Cu-TiO2 photocatalytic activity. The filters additionally exposed to near-ultraviolet light prominently decrease the intensity of Raman signatures of airborne contaminant due to the presence of pure TiO2.
