Journal
APPLIED SURFACE SCIENCE
Volume 603, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2022.154445
Keywords
Super-hydrophilic SEAS sensor; Three-dimensional SEAS uniformity; Coffee ring effect of colloidal analytes; Ultrahigh SEAS activity; Excellent flexibility
Categories
Funding
- National Natural Science Foundation of China (NSFC) [11905115, 12175126, 11575102]
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This study establishes an effective SERS sensor using a super-hydrophilic Au NPs@h-BN/BNCs substrate, which exhibits high SERS activity and excellent uniformity. The advantages include strong synergistic coupling effect between high-density Au NPs and modified h-BN, as well as multiple light-scattering effects in the 3D porous support. In addition, the flexible SERS substrate with customizable mechanical properties is suitable for portable operations in real-world scenarios.
The powerful surface-enhanced Raman scattering spectroscopy (SERS) practical technique is not only related to signal enhancement but also heavily dependent on spatial uniformity. Different from the routine hydrophobic substrates, an extraordinary super-hydrophilic SERS sensor is established by loading plasmonic Au nanoparticles (NPs) on two-dimensional (2D) hexagonal boron nitride (h-BN) then the hybrids uniformly are grafted into 3D bacterial nanocelluloses (BNCs). The Au NPs@h-BN/BNCs exhibit a remarkably high SERS activity with a limit of detection (LOD) of dyes at 0.1 femtomole (fM) level (similar to 10(-16) M). It is attributed to the strong synergistic coupling effect between highly dense Au NPs and modified h-BN as well as multiple light-scattering effects in 3D porous supports. More importantly, the distinctive advantage is further highlighted by the exceptional 3D spatial SERS uniformity with relative standard deviation (RSD) less than 3.4% along both horizontal and vertical directions. The unique feature is due to the 3D homogeneous distribution of the injected colloidal analytes via ultra-rapid liquid diffusion throughout the entire body with superior wettability. Besides, the flexible SERS substrates with excellent easy-tailorable mechanical properties can be robust enough to withstand the portable operations in real-world scenarios. These competitive merits are particularly beneficial for reliable SERS quantitative surveillance.
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