Abstract
In this work, XPS, Raman, TEM and UV–visible measurements were used to examine the composition and microstructure of black TiO2 (B-TiO2) nanorods. Results showed that the Brunauer-Emmett-Teller surface-area and average pore-size were 94.9 m2 g−1 and 1.67 nm, B-TiO2 presented 89.3% rutile and 10.7% anatase phases, and the rutile TiO2 nanorods with diameter of 5–7 nm were conducive to enhancing the optical properties under visible-light regime. Additionally, for B-TiO2, it was firstly demonstrated that the optical absorption-coefficient was closely correlated with the imaginary component of the dielectric constants.
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