Awa Kenta, Akashi Ryo, Akita Atsunobu, Naya Shin-Ichi, Kobayashi Hisayoshi, Tada Hiroaki
Graduate School of Science and Engineering, Kindai University, 3-4-1, Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan.
Environmental Research Laboratory, Kindai University, 3-4-1, Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan.
Chemphyschem. 2019 Sep 3;20(17):2155-2161. doi: 10.1002/cphc.201900632. Epub 2019 Aug 8.
Single-crystal SnO nanorods were grown on rutile TiO with a heteroepitaxial relation of SnO {001}/TiO {001} (SnO -NR#TiO ) by a hydrothermal reaction. Resulting compressive lattice strain in the SnO -NR near the interface induces a continuous increase in the a-axis length extending over 60 nm to relax towards the [001] direction from the root to the tip. UV-light irradiation of the robust SnO -NR#TiO stably progresses the selective oxidation of ethanol to acetaldehyde with an external quantum yield of 25.6 % at excitation wavelength (λ )=365 nm under ambient temperature and pressure. Spectroscopic analyses and density functional theory simulation results suggested that the extremely high photocatalytic activity stems from the smooth interfacial electron transfer from TiO to SnO -NR through the high-quality junction and subsequent efficient charge separation due to the lattice strain-induced unidirectional potential gradient of the conduction band minimum in the SnO -NR.
通过水热反应，在具有SnO {001}/TiO {001}（SnO -NR#TiO ）异质外延关系的金红石TiO上生长出单晶SnO纳米棒。界面附近SnO -NR中产生的压缩晶格应变导致a轴长度在超过60 nm的范围内持续增加，以从根部到尖端朝着[001]方向弛豫。在室温和常压下，对坚固的SnO -NR#TiO进行紫外光照射，能稳定地将乙醇选择性氧化为乙醛，在激发波长（λ）=365 nm时，外部量子产率为25.6％。光谱分析和密度泛函理论模拟结果表明，极高的光催化活性源于通过高质量结从TiO到SnO -NR的平滑界面电子转移，以及由于SnO -NR中导带最小值的晶格应变诱导的单向势梯度而导致的后续有效电荷分离。
