Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 26, Pages 29868-29875Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c08780
Keywords
Raman spectroscopy; enantio-differentiation; amino acids; chiral silica; polydopamine; silver
Funding
- National Natural Science Foundation of China [21475088]
- JSPS KAKENHI [JP16H06515, 19H02767]
- Grants-in-Aid for Scientific Research [19H02767] Funding Source: KAKEN
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Polydopamine (PDA) and silver (Ag) nanoparticles were first generated on chiral silica nanofibers and then detached from silica to form PDA/Ag composites. The as-obtained PDA/Ag showed surface-enhanced Raman scattering (SERS) activity but very weak circular dichroism optical activity. Interestingly, the PDA/Ag substrates could make a pair of tyrosine (or phenylalanine) enantiomers show different Raman scattering signal intensities, where the differences could reach 3 times. In contrast, PDA/Ag prepared by using racemic or achiral silica did not exhibit such discrimination performance. Therefore, this research offered a novel SERS-based enantiomeric differentiation method with the assistance of plasmonic metal-containing substrates stemmed from intrinsically chiral inorganic silica.
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