研究目的
To study the time course of photoabsorption of an aqueous suspension of titanium(IV) oxide (TiO2) particles using photoacoustic (PA) spectroscopy and to analyze electron accumulation and transfer under a photocatalytic suspension condition.
研究成果
The proposed method enables operando analysis of electron accumulation and transfer under a photocatalytic suspension condition using the PA technique. It offers a novel approach for easy and precise estimation of Ti3+ density on TiO2 powders and has potential for analyzing other photocatalytic particles.
研究不足
The study is limited by the need for further experiments to estimate Ti3+ density from the time-course curve of PA intensity accurately. The method's applicability to other semiconductor particles and under various conditions needs further validation.
1：Experimental Design and Method Selection:
The study used photoacoustic (PA) spectroscopy to analyze the time course of photoabsorption of an aqueous suspension of TiO2 particles. The methodology included UV irradiation to excite TiO2 and a laser diode as the probe light for detection of Ti3+ species.
2：Sample Selection and Data Sources:
Various TiO2 powder samples from commercial sources were used. Aqueous suspensions were prepared by adding TiO2 to an aqueous ethanol solution.
3：List of Experimental Equipment and Materials:
A homemade PA cell with an acrylic body and a quartz window, a laser diode emitting light at 532 nm, a function generator for modulating the output intensity, and a digital MEMS microphone for acquiring the PA signal.
4：Experimental Procedures and Operational Workflow:
The suspension was treated by ultrasound, transferred into the cuvette of the PA cell, and air was purged off by passing argon. The sample was illuminated with UV irradiation for excitation of TiO2, and the PA signal was recorded.
5：Data Analysis Methods:
Time-series data were acquired by analog conversion of the digital PA signal followed by Fourier transform with a Hamming window function.
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