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Two‐step hydrothermal fabrication of Na 0.23 TiO 2 nanofibers and enhanced photocatalysis after loaded with gold or silver determined by surface potentials
Author(s) -
Wang JingZhou,
Chen QiWen,
Zhou JianPing,
Lei YuXi,
Menke Neimule
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4466
Subject(s) - photocatalysis , surface plasmon resonance , materials science , noble metal , semiconductor , kelvin probe force microscope , scanning electron microscope , nanotechnology , nanofiber , surface plasmon , plasmon , nanoparticle , optoelectronics , hydrothermal circulation , fabrication , band gap , visible spectrum , chemical engineering , metal , composite material , chemistry , catalysis , metallurgy , biochemistry , engineering , atomic force microscopy , medicine , alternative medicine , pathology
Summary Pure Na 0.23 TiO 2 nanofibers were fabricated by a two‐step hydrothermal method after a series of experiments. Na 0.23 TiO 2 is a direct bandgap semiconductor and exhibits a strong photodegradative ability for RhB, which is difficult to be degraded. The photodegradative activity is much enhanced after loaded noble metal Au or Ag nanoparticles on Na 0.23 TiO 2 nanofibers by a chemical bath deposition method. Hot electrons are generated in metal nanoparticles through a localized surface plasmon (LSP) process under light illumination and then diffuse to a semiconductor and reduce the surface potential, which is detected directly by a scanning Kelvin probe microscopy (SKPM). The high electromagnetic field induced by the LSP resonance and strong coupling between noble metal and Na 0.23 TiO 2 are beneficial for the utilization of visible light, electron produce, charge transportation, and separation, as a result, promoting the activity of semiconductor‐based photocatalysts. This work supplies an effective method to directly probe the surface plasmon and highlights the application of Na 0.23 TiO 2 in photocatalysis.