In the realm of surface-enhanced Raman scattering (SERS)
research,
the precise detection and effective cleansing of substances are critical.
This study introduces a novel Au nanotriangle/Cs2AgBiBr6 (Au NT/CABB) SERS array, synthesized through a meticulous
two-step process, which demonstrates remarkable SERS effectiveness.
Using Rhodamine 6G (R6G) as the probe molecule, this substrate accurately
detects target molecules and achieves an exceptional detection threshold
of 1 × 10–13 M. The integration of CABB into
the substrate endows it with photocatalytic properties, thereby accelerating
the degradation of adsorbed signaling molecules and significantly
enhancing the reusability of the Au NT/CABB arrays. Furthermore, the
arrays exhibit outstanding SERS and photocatalytic performance with
methylene blue (MB) and MB&R6G mixed solutions, distinguishing
between the two signal molecules with high fidelity. Additionally,
the SERS enhancement mechanism of the Au NT/CABB array is analyzed
by the finite-difference time-domain (FDTD) simulation and energy
band structure. These findings highlight the substrate’s dual
capability in leveraging both electromagnetic and chemical enhancement
mechanisms for superior SERS performance, complemented by an integrated
photocatalytic self-cleaning feature, making it a promising candidate
for environmental detection applications.