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Pure TiO2 and copper-doped TiO2 (Cu–TiO2) films were prepared on LaAlO3(111) substrates by molecular beam epitaxy. We found that the Cu–TiO2 films could enhance the Raman scattering of LaAlO3. The Raman scattering of the LaAlO3 substrates is selectively enhanced in the Cu-doped TiO2/LaAlO3 heterojunctions. The doped Cu on TiO2 can enrich the energy level states of TiO2, which is attributed to the...
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