A highly sensitive and selective electrochemical sensor based on porous Cu₂ZnSnS₄ (CZTS) nanosheets is required for detecting ammonia-ammonium ions (NH₃–NH₄⁺). Porous CZTS nanosheets synthesized by microwave irradiation method were characterized by Raman, XRD, SEM, TEM, BET, DLS and NH₃-TPD. The porous nanosheets of CZTS-30 irradiated for 30 min with a surface area of 51.3 m² g⁻¹ are significant material and possess many important active sites for NH₃–NH₄⁺ oxidation. The electrode was made of a glassy carbon electrode (GCE) modified by CZTS-30. It was revealed by electrochemical measurements that there were two linear ranges for NH₃–NH₄⁺. One was the high concentration ranging from 1.0 mM to 600.0 mM (R² = 0.9989) with a sensitivity of 8.29 μA mM⁻¹ cm⁻², and the other was the low concentration between 0.1 mM and 1.0 mM (R² = 0.9990) with a high sensitivity of 96.14 μA mM⁻¹ cm⁻². It showed a detection limit of 30 μM (S/N = 10) for the sensor in NH₃–NH₄⁺ solution mixed with 0.5 mM H₂SO₄ at a fixed scan rate of 20 mV s⁻¹. This sensor also demonstrated desirable stability, reversibility and selectivity to NH₃–NH₄⁺. The CZTS/GCE is believed to become a new candidate structure for the electrochemical detection of NH₃–NH₄⁺.

需要一种基于多孔 Cu ₂ ZnSnS ₄ (CZTS) 纳米片的高灵敏度和选择性电化学传感器来检测氨铵离子 (NH ₃ –NH ₄ ⁺ )。采用微波辐射法合成的多孔CZTS纳米片通过拉曼、XRD、SEM、TEM、BET、DLS和NH ₃ -TPD进行表征。CZTS-30 的多孔纳米片经过 30 分钟的辐照，表面积为 51.3 m ²  g ^-1是重要的材料，并且具有许多重要的 NH ₃ –NH ₄ ⁺活性位点氧化。电极由CZTS-30改性的玻碳电极(GCE)制成。电化学测量表明，NH ₃ –NH ₄ ⁺有两个线性范围。一个是从 1.0 mM 到 600.0 mM ( R ²  = 0.9989)的高浓度，灵敏度为 8.29 μA mM ^-1  cm ^-2，另一个是介于 0.1 mM 和 1.0 mM 之间的低浓度 ( R ²  = 0.9990)具有 96.14 μA mM ^-1  cm ^-2的高灵敏度。它显示传感器在与 0.5 mM H 混合的NH ₃ –NH ₄ ⁺溶液中的检测限为 30 μM (S/N = 10)₂ SO ₄以20 mV s ^-1的固定扫描速率。该传感器还展示了理想的稳定性、可逆性和对 NH ₃ –NH ₄ ^{+ 的}选择性。CZTS/GCE 被认为成为电化学检测NH ₃ –NH ₄ ⁺的新候选结构。