Fig. S1.

Preparation of alkyne-terminated BDD. (A) A Raman spectrum of bare BDD. The excitation wavelength is 532 nm. (B) Schematic illustration of the preparation of alkyne-terminated BDD. (C) CVs in an acetonitrile solution of the TIPS-protected diazonium salt TIPS-Eth-ArN2+. Complete immobilization was confirmed after the second cycle. (D) CVs in an acetonitrile solution of ferrocene using bare (dotted line), TIPS-terminated (broken line), and alkyne-terminated (solid line) BDD electrodes. (E) X-ray photoelectron spectroscopy spectrum of peptide-terminated BDD. A strong N(1s) peak from the peptide and triazole ring was observed.