Fu Baihe, Zhang Zhonghai
School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, China.
Small. 2018 May;14(20):e1703610. doi: 10.1002/smll.201703610. Epub 2018 Apr 17.
Effective light trapping at the nanoscale is vital for efficient photoelectrochemical (PEC) applications. Photonic and plasmonic resonators are the two most promising approaches for this purpose, and the synergetic combination of these two resonators will tail the propagation lengths of incident light along with field enhancements, and thus presents further enhanced light-trapping activity. Herein, a new hybrid photonic-plasmonic resonator is proposed through sputtering plasmonic Au nanoparticles (NPs) into the 2D photonic TiO nanocavity. Through facile control of the size of Au NPs, the matching of resonant wavelength of plasmonic Au NPs and photonic nanocavities maximize the light-trapping intensity and thus further improve the PEC performance. Furthermore, for expanding the PEC applications, after functionalization of Au NPs with aptamer as a biomolecular recognition unit, a PEC aptasensor is also proposed and presents the highest sensitivity for antibiotic detection.
纳米尺度上的有效光捕获对于高效光电化学（PEC）应用至关重要。光子谐振器和等离子体谐振器是实现这一目的最有前景的两种方法，这两种谐振器的协同组合将随着场增强作用延长入射光的传播长度，从而展现出进一步增强的光捕获活性。在此，通过将等离子体金纳米颗粒（NPs）溅射至二维光子TiO纳米腔中，提出了一种新型混合光子 - 等离子体谐振器。通过轻松控制金纳米颗粒的尺寸，使等离子体金纳米颗粒与光子纳米腔的共振波长相匹配，可最大化光捕获强度，从而进一步提高PEC性能。此外，为了扩展PEC应用，在用适配体作为生物分子识别单元对金纳米颗粒进行功能化后，还提出了一种PEC适配体传感器，该传感器对抗生素检测具有最高灵敏度。
