Sun Hang, Zeng Shan, He Qinrong, She Ping, Xu Kongliang, Liu Zhenning
Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, Jilin Province 130022, China.
Dalton Trans. 2017 Mar 21;46(12):3887-3894. doi: 10.1039/c7dt00345e.
A facile approach for the preparation of spiky TiO/Au nanorod (NR) plasmonic photocatalysts has been demonstrated, which is through in situ nucleation and growth of spiky TiO onto AuNRs. Different aspect ratios of AuNRs in 2.5, 2.7, 4.1 and 4.5 have been applied to prepare spiky TiO/AuNR nanohybrids to achieve tunable and broad localized surface plasmon resonance (LSPR) bands. All spiky TiO/AuNR nanohybrids exhibit enhanced light harvesting by extending visible light absorption range by both transverse and longitudinal LSPR bands and decreasing light reflectance by their unique spiky structures. Compared to the bare AuNRs, commercial TiO (P25) and spiky TiO/Au nanosphere photocatalysts, the spiky TiO/AuNR photocatalysts exhibit significantly enhanced visible light photocatalytic activity in Rhodamine B (RhB) degradation due to their simultaneous enhancement in the light harvesting, charge utilization efficiency, and substrate accessibility. In particular, the spiky TiO/AuNR-685 photocatalysts show the best photocatalytic activity with ∼98.9% of the RhB degraded within 90 min under the irradiation of 420-780 nm, which could be ascribed to the most extended visible light absorption range and sufficient photon energy of TiO/AuNR-685 photocatalysts within this irradiation region. The bio-inspired nanostructure, as well as the facile and scalable fabrication approach, will open a new avenue for the rational design and preparation of high-performance photocatalysts for pollutant removal and water splitting.
已证明一种制备尖刺状TiO/Au纳米棒（NR）等离子体光催化剂的简便方法，即通过在AuNRs上原位成核和生长尖刺状TiO。已采用长径比分别为2.5、2.7、4.1和4.5的不同AuNRs来制备尖刺状TiO/AuNR纳米杂化物，以实现可调谐且宽的局域表面等离子体共振（LSPR）带。所有尖刺状TiO/AuNR纳米杂化物通过横向和纵向LSPR带扩展可见光吸收范围并因其独特的尖刺结构降低光反射率，从而表现出增强的光捕获能力。与裸AuNRs、商用TiO（P25）和尖刺状TiO/Au纳米球光催化剂相比，尖刺状TiO/AuNR光催化剂在罗丹明B（RhB）降解中表现出显著增强的可见光光催化活性，这归因于它们在光捕获、电荷利用效率和底物可及性方面的同时增强。特别是，尖刺状TiO/AuNR-685光催化剂表现出最佳的光催化活性，在420 - 780 nm照射下90分钟内约98.9%的RhB被降解，这可归因于尖刺状TiO/AuNR-685光催化剂在该照射区域内最宽的可见光吸收范围和足够的光子能量。这种受生物启发的纳米结构以及简便且可扩展的制造方法，将为合理设计和制备用于污染物去除和水分解的高性能光催化剂开辟一条新途径。
