TEM images were collected on a transmission electron microscope (HT7700, Hitachi, Japan). HRTEM images were obtained by a JEM-2100F microscope (JEOL, Japan) operated at an accelerating voltage of 200 kV. The infrared spectrum was performed on a Nicolet Is50 Fourier transform infrared spectrometer (Thermo Fisher Scientific, USA) by the solid-state total reflection technique. The Pt contents in E/Pt and PE-E/Pt were determined by ICP-MS (Agilent 7500 CE, USA). The hydrodynamic diameters of nanoparticles were measured by dynamic light scattering instrument (Zetasizer Nano ZS90, Malvern Instruments, UK). The circular dichroism spectra were recorded with a J-815 spectropolarimeter (Jasco International Co., Japan).

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