Journal
COATINGS
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/coatings11121500
Keywords
Cu modification; TiO2 nanotubes; ammonia oxidation; humidity sensing
Categories
Funding
- Croatian Science Foundation [HrZZ-IP2018-01-5246]
- Centre of Excellence for Advanced Materials and Sensing Devices, Ruder Boskovic Institute, Zagreb, Croatia [KK.01.1.1.01.0001,]
- European Regional Development Fund (ERDF) under the project Waste & Sun for photocatalytic degradation of micropollutants in water (OS-Mi) [KK.01.1.1.04.0006]
- European Regional Development Fund (ERDF) under the project Recycled rubber & Solar photocatalysis: an innovation for passive air and health protection [KK.01.1.1.07.0058]
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This paper emphasized the dual application of Cu-modified vertically aligned TiO2 nanotube arrays as photocatalyst and relative humidity sensor. The sample modified with 2 M Cu(NO3)(2) solution showed the highest efficiency for NH3 photocatalytic degradation and humidity response. XRD, SEM, and EDS were used to investigate the structure and impact of Cu modification, showing that the modified samples had higher NH3 oxidation activity and more pronounced humidity response.
In this paper, we emphasized the dual application of Cu-modified vertically aligned TiO2 nanotube arrays as photocatalyst and a relative humidity sensor. The TiO2 nanotube arrays were obtained by anodization of the titanium layer prepared using radio frequency magnetron sputtering (RFMS) and modified with different copper concentrations (0.5, 1, 1.5, and 2 M) by a wet-impregnation method. The sample modified with 2 M Cu(NO3)(2) solution showed the highest efficiency for the NH3 photocatalytic degradation and the most pronounced humidity response in comparison to the other studied samples. In order to investigate the structure and impact of Cu modification, X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS) were used. The photocatalytic activity and the kinetic study of ammonia oxidation were studied in a mini-photocatalytic wind tunnel reactor (MWPT), while relative humidity sensing was examined by impedance spectroscopy (IS). Higher NH3 oxidation was a direct consequence of the increased generation of (OH)-O-center dot radicals obtained by a more efficient photogenerated charge separation, which is correlated with the increase in the DC conductivity.
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