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ACS Appl Mater Interfaces. 2017 Jun 28;9(25):21457-21463. doi: 10.1021/acsami.7b05120. Epub 2017 Jun 14.

Highly Enhanced Raman Scattering on Carbonized Polymer Films.

Author information

1
Center for Multidimensional Carbon Materials, Institute for Basic Science , Ulsan 44919, Republic of Korea.
2
School of Energy and Chemical Engineering, UNIST , Ulsan 44919, Republic of Korea.
3
Department of Chemistry and School of Materials Science and Engineering, UNIST , Ulsan 44919, Republic of Korea.

Abstract

We have discovered a carbonized polymer film to be a reliable and durable carbon-based substrate for carbon enhanced Raman scattering (CERS). Commercially available SU8 was spin coated and carbonized (c-SU8) to yield a film optimized to have a favorable Fermi level position for efficient charge transfer, which results in a significant Raman scattering enhancement under mild measurement conditions. A highly sensitive CERS (detection limit of 10-8 M) that was uniform over a large area was achieved on a patterned c-SU8 film and the Raman signal intensity has remained constant for 2 years. This approach works not only for the CMOS-compatible c-SU8 film but for any carbonized film with the correct composition and Fermi level, as demonstrated with carbonized-PVA (poly(vinyl alcohol)) and carbonized-PVP (polyvinylpyrollidone) films. Our study certainly expands the rather narrow range of Raman-active material platforms to include robust carbon-based films readily obtained from polymer precursors. As it uses broadly applicable and cheap polymers, it could offer great advantages in the development of practical devices for chemical/bio analysis and sensors.

KEYWORDS:

Fermi level; carbon; carbonization; charge transfer; chemical enhancement; enhanced Raman scattering; photoresist

PMID:
28574699
DOI:
10.1021/acsami.7b05120

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