Polyyne samples C2nH2 (n = 4-6) were synthesized by irradiating single-wall carbon nanotubes in methanol with intense femtosecond laser pulses. For obtaining isolated polyynes (C8H2, C10H2, and C12H2), the original solution was separated by high performance liquid chromatography. The surface-enhanced Raman scattering spectra of isolated polyynes in Ag colloid have been investigated with naturally drying time, and clear peaks in the region of beta band for the isolated C8H2 were observed at 1910 and 1958 cm(-1) in the damp-dried Ag colloid samples for the first time. (C) 2017 Elsevier B.V. All rights reserved.