研究目的
Investigating the construction and capabilities of a newly developed transmission IR cell for in situ spectroscopic studies of photoprocesses on powdered high surface area materials, specifically focusing on titanium dioxide as a photocatalyst.
研究成果
The newly developed transmission IR cell enables in situ spectroscopic studies of photoprocesses on powdered high surface area materials with high reproducibility and time resolution. The device's capabilities were demonstrated through studies on hydrated and dehydrated TiO2, revealing UV-induced spectral alterations and photoactivated desorption of carbon monoxide. This cell design is suitable for investigating surface processes in catalysis and photocatalysis.
研究不足
The study is limited to powdered materials that can be prepared as self-supported pellets or thin films on IR-transparent supports. The cell operates within a temperature range of 20–800 °C and a pressure range from 10?7 Torr to 103 Torr. The sample thickness must be optimized for sufficient IR signal, which may limit the study of certain materials.
1：Experimental Design and Method Selection:
The study utilized a newly developed transmission-mode IR cell for in situ spectroscopic studies of photoprocesses on powdered materials. The cell design allows for the irradiation of materials while simultaneously recording spectra.
2：Sample Selection and Data Sources:
Titanium dioxide (TiO2) and zirconium dioxide (ZrO2) samples were used to demonstrate the capabilities of the IR cell. Samples were prepared as thin self-supported pellets.
3：List of Experimental Equipment and Materials:
The IR cell was equipped with BaF2 optical windows, a high-pressure 100 W Hg lamp for UV irradiation, and a Nicolet FTIR iS50 spectrometer for recording spectra.
4：Experimental Procedures and Operational Workflow:
Samples were annealed under high vacuum conditions, hydrated, and then exposed to UV irradiation while recording IR spectra in situ.
5：Data Analysis Methods:
Spectra were analyzed for changes in OH-group stretching vibrations, H-bonded molecular water, and baseline deviations to study photoinduced processes.
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