研究目的
Investigating the synthesis of TiO2 nanofoam-nanotube array structures via a two-step anodic oxidation process for surface-enhanced Raman scattering (SERS) applications.
研究成果
The TiO2 nanofoam-nanotube array structures synthesized via a two-step anodic oxidation process demonstrate excellent SERS performance, with an enhancement factor of 2.3×105 for methylene blue. The enhancement is attributed to the nanofoam structure, which facilitates multiple laser scattering. This simple and cost-effective method has potential applications in chemistry, biology, and nanoscience.
研究不足
The sensitivity at low concentrations of probe molecules needs improvement. The study focuses on TiO2 materials, and the findings may not directly apply to other semiconductor materials.
1：Experimental Design and Method Selection:
A two-step anodic oxidation process was used to synthesize TiO2 nanofoam-nanotube array structures. The first step involved a lower voltage oxidation to produce an initial TiO2 nanotube array, serving as a protective layer. The second step involved a higher voltage oxidation to grow the nanofoam-nanotube array.
2：Sample Selection and Data Sources:
Samples were synthesized with varying oxidation voltages and times to investigate the effect on the structure and SERS performance.
3：List of Experimental Equipment and Materials:
Anodic oxidation setup, TiO2 materials, and electrolytes were used.
4：Experimental Procedures and Operational Workflow:
The process involved adjusting the anodic voltage and electrochemical reaction time to control the morphology of the TiO2 structures.
5：Data Analysis Methods:
SEM, XRD, UV-vis absorption spectra, and Raman spectroscopy were used to characterize the samples and evaluate their SERS performance.
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