| Budget Amount *help |
¥26,390,000 (Direct Cost: ¥20,300,000、Indirect Cost: ¥6,090,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2016: ¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
|
|---|
| Outline of Final Research Achievements |
In this project, we have performed infrared transient and steady-state absorption spectroscopy of anatase TiO2 nanoparticles as a function of the number of water adsorbate layers. These absorption measurements in water vapor atmosphere have an advantage over those in liquid water because the number of water layers at the interface can be controlled by relative humidity. We showed that water adsorbates strongly interacting with substrate serve as effective hole traps, but the trapping ability is reduced by hydrogen bonding with other water molecules in the second layer. In addition, we have investigated the hole decay characteristics and photocatalytic activity of BiVO4 with single-particle transient absorption microscopy and found that grain boundaries in aggregated particles do not work as recombination centers but play an important role in elongation of carrier lifetime and thus in enhancing the reactivity of photocatalyst through trap-detrap processes.
|
