Novel and uniform urchin-like Co₉S₈ nanomaterials assembled with needle-like nanorods were synthesized by a facile two-step hydrothermal process, and were found to exhibit intrinsic peroxidase-like activity. As a new peroxidase mimic, their catalytic properties, kinetics and mechanism were studied in depth by several techniques. The results showed that the catalytic activity of urchin-like Co₉S₈ nanomaterials was highly efficient, which was arised from high electron-transfer ability of their unique morphology. Interestingly, using the peroxidase-like activity of urchin-like Co₉S₈ nanomaterials, a novel off-on sensor for detection of Cu²⁺ was constructed. The sensor showed a good linear range of 0.5–10 μM with a low detection limit of 0.09 μM. The proposed method was successfully applied for Cu²⁺ determination in real samples with satisfactory results.

通过一种简便的两步水热法合成了新颖且均匀的，由针状纳米棒组装而成的，类似顽童状的Co ₉ S ₈纳米材料，并发现其具有固有的过氧化物酶活性。作为一种新的过氧化物酶模拟物，通过几种技术对它们的催化性能，动力学和机理进行了深入研究。结果表明，由于其独特形态的高电子传递能力，类顽固的Co ₉ S ₈纳米材料具有很高的催化活性。有趣的是，利用类似Urchin的Co ₉ S ₈纳米材料的过氧化物酶活性，可检测新型Cu ^2+的开关传感器建造了。传感器的线性范围为0.5–10μM，检测极限为0.09μM。该方法成功用于实际样品中Cu ^2+的测定，结果令人满意。