article · Physica Scripta
Abstract In this work, a high-performance WO 3 /Au/Cu 2 O-CuO heterojunctions was deposited via dc reactive magnetron sputtering, which displayed superhydrophilicity conversion and superior photocatalytic performance for the degradation of methylene blue. WO 3 , WO 3 /Cu 2 O-CuO, WO 3 /Au and WO 3 /Au/Cu 2 O-CuO heterojunctions were sputtered on precleaned glass and Si(100) substrates. The chemical composition, crystal structure, surface morphology, optical absorption, water contact angle and photocatalytic activities of the prepared single and multilayers films were examined to elucidate the correlation between structure and other properties. SEM revealed tiny small nanoparticles for WO 3 film, close-packed nanoparticles for WO 3 /Cu 2 O-CuO multilayers and nanoparticles with more open structure for WO 3 /Au/Cu 2 O-CuO heterojunctions. The WO 3 /Au/Cu 2 O-CuO heterojunctions had the highest optical absorption. The estimated band gap values were 3.16, 3.08, 2.97 and 2.65 eV for WO 3 , WO 3 /Cu 2 O-CuO, WO 3 /Au and WO 3 /Au/Cu 2 O-CuO, respectively. The WO 3 /Cu 2 O-CuO, WO 3 /Au and WO 3 /Au/Cu 2 O-CuO became superhydrophilic after UV illumination. The remarkable photocatalytic activities of WO 3 /Au/Cu 2 O-CuO is attributed to the enhanced efficiency of separation for photogenerated hole–electron pairs.
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DOI: 10.1088/1402-4896/ad7544
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