| http://www.w3.org/ns/prov#value | - The major peaks of the SERS spectra reveal the characteristic Raman bands of BPE, that is, 1640???cm???1 and 1610???cm???1 due to (C???C) stretching modes, 1200???cm???1 due to both stretching and rocking modes of () where is a ring carbon attached to a bridging carbon and is a bridging carbon, and 1010???cm???1 due to both (C???C) and (C???N) stretching modes [23].
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