Two-Orders-of-Magnitude Enhancement of SERS Activity via a Simple Surface Engineering of Quasi-Metal Single-Crystal Frameworks.
basic_science · Level V
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- Record sourced from PubMed, PMID 39225553.
- Also identified by DOI 10.1021/acs.nanolett.4c03309.
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Abstract
Beyond noble metals and semiconductors, quasi-metals have recently been shown to be noteworthy substrates for surface enhanced Raman spectroscopy, and their excellent quasi-metal surface-enhanced Raman spectroscopy (SERS) sensing has demonstrated a wider range of application scenarios. However, the underlying mechanism behind the enhanced Raman activity is still unclear. Here, we demonstrate that surface hydroxyls play a crucial role in the enhancement of the SERS activity of quasi-metal nanostructures. As a demonstration material, quasi-metallic MoO<sub>2</sub> single-crystal frameworks rich in surface hydroxyls have been shown to have 100 times higher SERS activity than MoO<sub>2</sub> single-crystal frameworks without hydroxyl functionalization, with a Raman enhancement factor of up to 7.6 × 10<sup>7</sup>. Experimental and first-principles density-functional theory calculation results show that the enhanced Raman activity can be attributed to an effective interfacial charge transfer within the MoO<sub>2</sub>/OH/molecule system.