期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 52, 页码 58390-58402出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c18138
关键词
anodized aluminum oxide nanowire; multiscale topography; localized surface plasmon resonance; perfect absorption; colorimetry; surface-enhanced Raman scattering
资金
- Yonsei University [2019-22-0097]
In this study, a plasmonically active substrate is developed with the aim of controlling the perfect absorption and manipulating its optical properties for application in SERS (in NIR regime) and colorimetry. Based on modified fabrication method of anodized aluminum oxide (AAO), the cost-effective self-aggregation technique is presented to fabricate unique topography of bone-fire-like funnel-shaped collapsed and vertically aligned nanowire structures. The length of the nanowire and the modification of surface topography induced by capillary force inside the nanowire are set to structural parameters, and the effect of their changes is closely studied. After deposition of 40 nm gold (Au) film on numerous AAO nanowire structures with different wire lengths and unique topography, the localized surface plasmon resonance excitation is generated, and also its application on reflection and SERS spectra have been shown quantitatively. The length of the wire and surface topography modification are identified as suitable parameters to tune the reflection/absorption (from <40 to >90%) as well as colorimetric effect. Finally, an optimized wire length of Au-coated AAO substrate in SERS sensing application with 3.92 x 10(5) order of enhancement of rhodamine 6G (R6G) Raman signal is demonstrated.
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