Cho, In-Sun Lee, Sangwook Noh, Jun Hong Choi, Geun Kyu Jung, Hyun Suk Kim, Dong Wan Hong, Kug Sun 2024-01-20T22:30:31Z 2024-01-20T22:30:31Z 2021-09-03 2008-11-27 1932-7447 https://pubs.kist.re.kr/handle/201004/132971 A novel method was used to synthesize orthorhombic FeNbO4 nanoparticles by a hydrothermal process followed by calcination at 600 degrees C, and their optical, photoelectrochemical, and photocatalytic properties were investigated. The microstructural and local structural properties were characterized using X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy (TEM), and Raman spectroscopy. The FeNbO4 particles obtained were composed of much smaller nanocrystal lines, with an average size of 10-20 nm, compared to particles prepared at 1000 degrees C through a conventional solid-state reaction method. Moreover, the optical band gap energy of the nanoparticles was estimated to be 1.93 eV from the UV-vis diffuse reflectance, and their flat-band potential in 1 M NaOH was -0.4 V (SCE). The X-ray photoelectron spectroscopy analysis revealed that the nanoparticles had fewer surface defects, such as oxygen vacancies, than the particles prepared by the solid-state reaction method. The FeNbO4 nanoparticles also exhibited a much higher photocatalytic activity for the degradation of rhodamine B dye solution under visible light irradiation (>420 nm). This higher photocatalytic activity of the FeNbO4 nanoparticles was attributed to their higher optical absorption ability and smaller particle size, as well as fewer surface defects. English AMER CHEMICAL SOC GAS-SENSITIVE RESISTORS SURFACE-DEFECTS OXYGEN NO ADSORPTION MOSSBAUER OXIDES SIZE DYE Visible-Light-Induced Photocatalytic Activity in FeNbO4 Nanoparticles Article 10.1021/jp807006g 1 JOURNAL OF PHYSICAL CHEMISTRY C, v.112, no.47, pp.18393 - 18398 JOURNAL OF PHYSICAL CHEMISTRY C 112 47 18393 18398 scie scopus 000261056500017 2-s2.0-57549105647 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article GAS-SENSITIVE RESISTORS SURFACE-DEFECTS OXYGEN NO ADSORPTION MOSSBAUER OXIDES SIZE DYE