Synthesis of gold nanostars with fractal structure: application in surface-enhanced Raman scattering Jian Zhu, Mei-Jin Liu, Jian-Jun Li and Jun-Wu Zhao Eur. Phys. J. B, 90 11 (2017) 216 Published online: 13 November 2017 DOI: 10.1140/epjb/e2017-80100-2