期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 11, 页码 13703-13712出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c23939
关键词
TiO2/Ag arrays; recyclable SERS substrates; self-assembled; charge transfer; work function
资金
- Fund of Natural Science Foundation of Fujian Province of China [2020J01194, 2020J01190, 2019J01283]
- National Engineering Research Center for Optoelectronic Crystalline Materials [OCM-2020-04]
- Key Science and Technology Program of Ji'an City [2019J55]
Highly ordered TiO2/Ag bilayer structures were fabricated on p-type silicon wafers using photolithography and electrochemical self-assembly methods. The interfacial charge transfer behavior of the Si/TiO2/Ag structure was studied, which is crucial for enhancing SERS performance.
In this work, highly ordered TiO2/Ag bilayer structures on p-type silicon (Si) wafers are prepared by photolithography and electrochemical self-assembly methods. The interfacial charge transfer (CT) of this Si/TiO2/Ag multistorey structure with a specially aligned work function is studied. This is important to deduce the interfacial electron migration behavior of SERS. The three-dimensional finite-difference time-domain (3D FDTD) simulation is used to explore the combined CT-EM enhancement mechanism. The result shows that the electron movement under the CT mechanism can induce the resonance effect of free electrons to further improve EM performance. In addition, the effect of agglomerated Ag nanoparticle size distribution on the SERS property and the self-cleaning property of Si/TiO2/Ag multistorey structures is investigated. Finally, this unique structure of highly ordered Si/TiO2/Ag SERS substrate shows superior sensitivity, reproducibility, and stability. Rhodamine 6G (R6G) with trace concentrations as low as 10(-15) M can be detected, and the EF is estimated to be about 8.9 x 10(13). The relative standard deviation (RSD) at 1511 cm(-1) is about 4.7%. These results are very promising for the practical application of the SERS technique in the rapid trace determination in many fields.
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