Localized surface plasmon resonance enhanced photocatalysis: an experimental and theoretical mechanistic investigation

Autor(es)

de Souza, Michele Lemos ^{[1, 2]} ; dos Santos, Diego Pereira ^{[3, 1]} ; Corio, Paola ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Chem, Sao Paulo, SP - Brazil

^[2] Fluminense Fed Univ UFF, Dept Chem, Campus Volta Redonda, Volta Redonda, RJ - Brazil

^[3] Univ Campinas UNICAMP, Inst Chem, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RSC ADVANCES; v. 8, n. 50, p. 28753-28762, 2018.
• Citações Web of Science: 5

Resumo

Titanium dioxide (TiO2) is an advantageous material in catalytic photodegradation due to its low cost, high stability, and considerably higher efficiency when compared to other semiconductors. However, the need for artificial radiation sources in the UV range is a limitation to its use in wastewater remediation. In this context, Localized Surface Plasmon Resonance (LSPR) has been shown to enhance the photoexcitation of charge carriers in the semiconductor. In the present work, the investigation of catalytic photodegradation of phenol solution under distinct excitation by UV-visible or just visible radiation, employing three TiO2 based plasmonic catalysts, was conducted. Spherical silver nanoparticles which present LSPR along the TiO2 bandgap energy and electrically insulated silver nanoparticles were employed. Gold nanoparticles, which present low energy LSPR, were also employed in order to compare the excitation efficiency. Discrete dipole approximation simulations were carried out in order to verify the electric field enhancement and penetration at the semiconductor surface of each plasmonic catalyst. The results presented here may help to shed some light with respect to the contribution of plasmonic photocatalysts and the charge transfer mechanism in catalysts containing plasmonic structures. (AU)

• Processo FAPESP: 08/03636-5 - Nanocompósitos metálicos para aplicações em processos fotoquímicos intensificados: efeitos de plasmon em fotocatálise e fotoeletroquímica
• Beneficiário: Michele Lemos de Souza
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 16/21070-5 - Espectroscopia vibracional com resolução espacial
• Beneficiário: Mauro Carlos Costa Ribeiro
• Modalidade de apoio: Auxílio à Pesquisa - Temático