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Cu 0.78 Sn 0.12 Mn 0.1 O x Thin Films as a Photocatalytic Material under Visible Light
Author(s) -
Kuo Li–Lun,
Lan KaiWei,
Hsiao YuCheng,
Hong YingJhan,
Tsai ChungMin,
Hu ChiChang,
Yew TriRung
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901903
Subject(s) - materials science , thin film , photocurrent , band gap , photodegradation , visible spectrum , annealing (glass) , analytical chemistry (journal) , photocatalysis , optoelectronics , catalysis , nanotechnology , metallurgy , chemistry , biochemistry , chromatography
Abstract This work investigates the feasibility of using an earth‐abundant and eco‐friendly Cu 0.78 Sn 0.12 Mn 0.1 O x thin film as a catalyst for photodegradation applications under visible light. The thin film was deposited by e‐beam evaporation using the pallet formed using CuO, SnO 2 , and MnO 2 powders as raw materials. The photocurrent response and performance as a catalyst of Methyl Orange (MO) dye photodegradation was optimized by varying the oxide composition to tune band gap and the use of post‐annealing at 500 °C for 3 hr in air to obtain crystalline structure of Cu 0.78 Sn 0.12 Mn 0.1 O x thin films for higher photoconductivity. The band gap, conduction band energy level, and valence band energy level of the crystalline Cu 0.78 Sn 0.12 Mn 0.1 O x oxide thin film were characterized to be 2.3 eV, −4.4 eV and −6.7 eV to vacuum, respectively. The stable photocurrent response with an intensity of ∼42 uA/cm 2 at an applied voltage of −0.4 V under filtered 150 W Xe‐lamp visible light illumination could be achieved, which is higher than previous works even with lower power and thinner materials. Besides, the feasibility of Cu 0.78 Sn 0.12 Mn 0.1 O x thin film for MO photodegradation under the visible light has also been demonstrated, though the rate constant still needs further improvement.