Metal-organic frameworks: A novel SERS substrate

Tsung Han Yu, Chin Hsian Ho, Cheng You Wu, Ching Hsuan Chien, Chia Her Lin, Szetsen Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

We report the direct observation of surface-enhanced Raman scattering (SERS) effect using metal-organic frameworks (MOFs) as substrates. Without the aid of any metal colloids or enhancing agents, the SERS signals of methyl orange (MO) adsorbed in MOFs were observed and even remained active if the organic linkers in MOFs were completely removed by high temperature and O2 plasma treatments. It implies that the SERS active site is at the metal oxide clusters. The ultraviolet-visible spectra of MO, MOFs, and MO-MOF complexes show that absorption peaks are far from laser excitation line. Thus, conventional resonance enhancement effect should be ruled out, and charge-transfer mechanism is the most likely scenario responsible for the observed SERS effect. Density functional theory (DFT) was used to interpret the chemical enhancement mechanism and the adsorption orientation-dependent SERS spectra in our observation. The preferred adsorption orientations calculated by DFT method are consistent with the observed SERS results.

Original languageEnglish
Pages (from-to)1506-1511
Number of pages6
JournalJournal of Raman Spectroscopy
Volume44
Issue number11
DOIs
Publication statusPublished - 2013 Nov
Externally publishedYes

Keywords

  • DFT
  • methyl orange
  • MIL-100
  • MIL-101
  • Raman

ASJC Scopus subject areas

  • Materials Science(all)
  • Spectroscopy

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