本发明涉及电化学技术领域、环境检测技术领域，特别涉及一种用于检测水中铜离子含量的光电化学传感器。该光电化学传感器是FTO/TiO2/CdS电极，其制备方法是先在FTO导电玻璃上沉积纳米TiO2，然后通过化学水浴沉积法在FTO/TiO2上生长CdS，从而制备出FTO/TiO2/CdS电极。本发明利用了CdS纳米材料与溶液中的Cu2+的选择性相互作用，把所制得的FTO/TiO2/CdS复合材料构建成光电化学传感界面用以检测水中的Cu2+, 线性范围为10‑9～10‑6 M, 最低检出限为0.5nM。本发明制备方法较为简单，且操作简便，所构建的光电传感器也具有较好的选择性，稳定性与准确性。
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