Microstructural and optical studies of CuO thin films prepared by chemical ageing of copper substrate in alkaline ammonia solution

作者：Alami Abdul Hai^*; Allagui Anis; Alawadhi Hussain

来源：Journal of Alloys and Compounds, 2014, 617: 542-546.

DOI：10.1016/j.jallcom.2014.07.221

• Chemical conversion coating
• Cupric oxide
• Optical spectroscopy
• Band gap

In this paper, we report on the time-dependent development of cupric oxide films by chemical modification of copper substrates submerged horizontally in a room temperature 75 mmol/L ammonia solution at pH 11, over a period of nine days. Morphological and structural characterization of the oxide-substrate tandems were carried out by SEM-EDX and XRD, while the relative directional spectral absorptivity and reflectivity were determined by Vis-NIR spectrometry. The ageing process, controlling both the color and morphological structure of the predominately amorphous-CuO/Cu, has positively contributed to the enhancement of spectral absorptivity, while band gap values evolve from 1.29 to 1.39 eV for exposure times from 36 to 168 h.

• 出版日期2014-12-25