Enhanced visible light response of a WO3 photoelectrode with an immobilized fibrous gold nanoparticle assembly using an amyloid-β peptideElectronic supplementary information (ESI) available: Information on instrumentation, synthesis of Aβ peptide, preparation of electrodes, and additional data on photocurrent generation experiments. See DOI: 10.1039/c6ra26916h

• Main Authors: Onoda, Akira, Harada, Hirofumi, Uematsu, Taro, Kuwabata, Susumu, Yamanaka, Ryo, Sakurai, Shinichi, Hayashi, Takashi
• Format: Journal Article
• Language: English
• Published: 04.01.2017
• ISSN: 2046-2069
• DOI: 10.1039/c6ra26916h

A WO 3 photoelectrode immobilizing a fibrous gold nanoparticle (AuNP) assembly using an amyloid-β (Aβ) peptide was constructed and its ability for photocurrent generation upon visible light irradiation was investigated. AuNPs attached using Aβ peptide (Aβ-AuNP) assemble with a fibrous structure at pH 4.5, which disperses at pH 11. The modified Aβ-AuNPs are immobilized on the surface of WO 3 fabricated on a fluorine-doped tin oxide (FTO) electrode (Aβ-AuNP ass @WO 3 /FTO or Aβ-AuNP dis @WO 3 /FTO, respectively). The photocurrent generation response of the Aβ-AuNP ass @WO 3 /FTO electrode is clearly increased relative to that of Aβ-AuNP dis @WO 3 /FTO upon visible light irradiation ( λ = 420-750 nm), indicating that the fibrous AuNP assembly enhances the visible light response of the WO 3 photoelectrode. A WO 3 photoelectrode immobilizing a fibrous gold nanoparticle (AuNP) assembly using an amyloid-β (Aβ) peptide exhibits enhanced photocurrent generation upon visible light irradiation.