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Heterojunction and direct Z-scheme nanostructures are two typical representatives of an efficient photocatalyst, which is composed of two semiconductors. However, it is a great challenge to construct each of them on purpose. The photodeposition technique can be a potentially powerful tool to regulate the electron flow direction for constructing these nanostructures. In this report, CdS nanoparticles were deposited on the g-C₃N₄ nanosheets by photodeposition and chemical deposition methods for comparison. In the photodeposition case, PL and charge flow tracking demonstrate that a type II heterojunction is constructed because CdS is selectively deposited at the electron transfer site of g-C₃N₄, which leads to the photoexcited electron from g_–C₃N₄ tending to transfer to CdS in the composites. In the latter, the CdS is randomly deposited onto the g-C₃N₄ nanosheets through chemical deposition. There is no …