Peptide-based gemini surfactants, called PG-surfactants, consisting of a tri- or tetra-Asp peptide core and acetylated dodecylamine-conjugated Cys residues at both the N- and C-terminal ends (D3C12 and D4C12), form a stable planar bilayer membrane on a solid support. From the DLS and TEM analyses, D3C12 and D4C12 have a tendency to form bilayer morphologies in a buffer solution, which reflects their tendency to form a stable planar bilayer membrane.