Development of Highly Sensitive Raman Spectroscopy for Subnano and Single-Atom Detection

Area of Science:

• Analytical Chemistry
• Catalysis Science
• Materials Science

Background:

• Direct detection and characterization of sub-nanoparticles (SNPs) and single-atom catalysts (SACs) present significant analytical challenges.
• Existing characterization techniques for SNPs and SACs on substrates often require large-scale, sophisticated analytical facilities.

Purpose of the Study:

• To develop an ultrasensitive, laboratory-scale vibrational spectroscopic technique for characterizing SNPs and SACs.
• To overcome the limitations of current methods in analyzing these small, frontier materials.

Main Methods:

• Development of a novel vibrational spectroscopic technique.
• Utilizing anisotropic stellate-shaped signal amplifiers to generate nano-spatial local enhancement fields.
• Expanding accessibility of small targets on substrates into evanescent electromagnetic fields.

Main Results:

• Achieved detection of isolated sub-nanoparticles and single-atom catalysts.
• Enabled revelation of intermolecular/interatomic interactions within subnano configurations under experimental conditions.
• Demonstrated an ultrasensitive, laboratory-scale method for SNP and SAC characterization.

Conclusions:

• The developed
• in situ subnano spectroscopy
• technique significantly enhances the accessibility and characterization of SNPs and SACs.
• This advancement facilitates a comprehensive understanding of subnano and single-atom catalyst science.
• The technique holds promise for broader applications in analytical chemistry and catalysis research.