In this study, Ag/Cu@CuFe₂O₄ nanocomposites were prepared using hydrothermal method and sedimentation-precipitation method for the detection of TMA gas. The morphology, crystal structure and elemental composition of the materials were analyzed by XRD, SEM, EDS and XPS characterization, and the results showed that the Ag/Cu@CuFe₂O₄ composites were successfully synthesized. When the content of Ag was 10% by molar ratio, the Ag/Cu@CuFe₂O₄ (ACF-10) sensor exhibited optimal performance at a working temperature of 150 ^oC, showing the best response to TMA gas. The ACF-10 sensor had a response and recovery time of 8 s and 14 s for 20 ppm TMA, with a response value of 42.8%. The sensor also demonstrated excellent selectivity, repeatability, and enduring stability over the long-term. The presence of Ag and Cu increases the adsorption of TMA gas on the material's surface by promoting catalytic reactions with oxygen molecules. Additionally, the enhanced TMA gas sensing performance of the Ag/Cu@CuFe₂O₄ nanocomposite material was further elucidated through theoretical calculations based on first principles. The constructed TMA gas detection circuit can detect and display TMA gas concentration, enabling real-time TMA gas detection functionality.

中文翻译：

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基于双金属 Ag/Cu@CuFe2O4 的三甲胺气体传感器：实验和 DFT 计算


本研究采用水热法和沉降-沉淀法制备了 Ag/Cu@CuFe₂O₄ 纳米复合材料，用于 TMA 气体的检测。通过XRD、SEM、EDS和XPS表征分析了材料的形貌、晶体结构和元素组成，结果表明，成功合成了Ag/Cu@CuFe₂O₄复合材料。当 Ag 含量为 10%（摩尔比）时，Ag/Cu@CuFe₂O₄ （ACF-10） 传感器在 150^oC 的工作温度下表现出最佳性能，对 TMA 气体表现出最佳响应。ACF-10 传感器对 20 ppm TMA 的响应和恢复时间为 8 秒和 14 秒，响应值为 42.8%。该传感器还表现出出色的选择性、可重复性和长期稳定性。Ag 和 Cu 的存在通过促进与氧分子的催化反应来增加 TMA 气体在材料表面的吸附。此外，通过基于第一性原理的理论计算，进一步阐明了 Ag/Cu@CuFe₂O₄ 纳米复合材料增强的 TMA 气体传感性能。构建的 TMA 气体检测电路可以检测和显示 TMA 气体浓度，从而实现实时 TMA 气体检测功能。