Largely enhanced photocurrent via gap-mode plasmon resonance by a nanocomposite layer of silver nanoparticles and porphyrin derivatives fabricated on an electrode

摘要

Photocurrent generation efficiency via the photoactive dyes, porphyrins, was strongly enhanced by construction of a nanocomposite structure, which consists of an undercoat layer of (3-mercaptopropyl)trimethoxysilane and densely and homogeneously attached silver nanoparticles on an electrode. The employed 5 -(4-carboxyphenyl)-10,15,20-triphenylporphyrins, 1, were embedded on the silver nanoparticle surface through their carboxylate moiety. The photo-absorption of 1 was significantly influenced by normal and gap-mode plasmon bands. The photocurrent of the nanocomposite structure was more strongly enhanced via the Q band excitation of 1, overlapped with the gap-mode plasmon band in the absorption wavelength range, and also showed stable photocurrent.