CdS is an n type

The work was performed in the framework of the National Institute of Photonics (INCT de Fotônica). We acknowledge the Nanotechnology National Laboratory (LNNano) for HR-TEM measurements.
CdS; CdS/Cu2O; Methyl orange; Photocatalytic efficiency
1. Introduction
With the development of economy and society, environmental pollution RO5126766(CH5126766) increasing seriously, especially for water pollution. Photocatalytic technology is a very effective method for the treatment of environmental pollutants [1], [2], [3], [4] and [5].