Open AccessInfluence of Cd, Mn, and Co addition on the structural and optical properties of TiO2 crystal
Author(s) -
Sayekti Wahyuningsih,
Candra Purnawan,
Dahniar Nur Aisyah
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/578/1/012015
Subject(s) - calcination , anatase , band gap , materials science , transition metal , titanium , metal , analytical chemistry (journal) , ion , manganese , impurity , inorganic chemistry , nuclear chemistry , crystallography , chemistry , catalysis , photocatalysis , metallurgy , biochemistry , optoelectronics , organic chemistry , chromatography
Synthesis of TiO 2 -M (M = Cd, Mn, Co) has been done by the sol gel method. Solution of titanium (IV) isopropoxide was hydrolyzed using a solution of glacial acetic acid at a temperature range of 10-15 °C to obtain a sol, subsequently heated to form a white gel. Ion solution Cd (II), Mn (II) and Co (II) each added to the gel TiO 2 with Ti:M mole ratio (M= Cd, Mn, Co) = 3:1 (mol/mol). After calcination process at a temperature of 400 °C, we have obtained TiO 2 and TiO 2 -M (Cd, Mn, Co). Characterization of the samples with XRD showed TiO 2 -M (M = Cd, Mn, Co) produces crystalline of anatase TiO 2 phase. SEM-EDX results showed differences in the amount of metal contained within TiO 2 -M (M= Cd, Mn, Co) that is equal to 8.62% (w/w) Cd; 3.26% (w/w) Mn; 0.721% (w/w) Co. The addition of transition metals ion as impurities as Cd (II), Mn (II), or Co (II) have inhibited the growth of TiO 2 crystals. The insertion of metal ions in the TiO 2 were also affected the optical properties shown by the energy band gap (Eg) shift in order of Eg TiO 2 (3.35 eV)>TiO 2 -Cd (3.10 eV)>TiO 2 -Co (3.00 eV)>TiO 2 -Mn (2.5 eV). The eletronic structures of TiO 2 doped 3d transition metals showed that an electron occupied level energy occurs. Electron from dopand are somewhat delocalized, thus significantly contributing to the formaton of the valece band with O p and Ti 3d electrons. Based on a comparation with the absorption data, we show that t 2 g state of the dopand plays a significant role in the photoresponse of TiO 2 under visible irradiaton.