This paper reports on ammonia (NH₃) sensing characteristics of a new semiconducting metal oxide (SMO) sensor. employing a cerium oxide (CeO₂) thin film and platinum (Pt) nanoparticles (NPs) as a sensing layer. The thickness of CeO₂ thin film is 30 nm and the particle size of Pt NPs is about 4–6 nm. Based on the enhanced surface area/volume (S_A/V) ratio and catalytic ability of Pt metal, the sensing behaviors are efficiently improved owing to the smaller Pt NPs. A high sensing response of 5.81 under 1000 ppm NH₃/air gas and a low detectable content of 1 ppm NH₃/air are acquired at 275 ℃. In addition, a relatively fast sensing action with the response (recovery) times of 15 s (85 s) and 6 s (25 s) are observed upon exposure to 1000 and 1 ppm NH₃/air gas, respectively, at 300 ℃. The Langmuir isotherm is used to study the related surface coverage under introduced ammonia gas. The proposed Pt NP/CeO₂ sensor shows prominent stability for long-term operation without intentional passivation treatment. The proposed sensor device’s benefits include a simple device structure, relatively easy manufacturing, a wide sensing range of ammonia gas content (1–1000 ppm NH₃/air), and lower cost.

本文报道了一种新型半导体金属氧化物 (SMO) 传感器的氨 (NH ₃ ) 传感特性。采用氧化铈 (CeO ₂ ) 薄膜和铂 (Pt) 纳米粒子 (NPs) 作为传感层。CeO ₂薄膜的厚度为30 nm，Pt NPs的粒径约为4-6 nm。基于 Pt 金属增强的表面积/体积 (S _A /V) 比和催化能力，由于更小的 Pt NPs，传感行为得到有效改善。_{在 1000 ppm NH 3} /空气气体下具有 5.81 的高传感响应和 1 ppm NH ₃的低可检测含量/空气在275℃下获得。此外，在 300 ℃ 分别暴露于 1000 和 1 ppm NH _{3 /空气气体时，观察到响应（恢复）时间为 15 s (85 s) 和 6 s (25 s) 的相对快速的传感动作。}Langmuir 等温线用于研究引入氨气下的相关表面覆盖率。所提出的 Pt NP/CeO ₂传感器在无需有意钝化处理的情况下长期运行显示出显着的稳定性。所提出的传感器装置的优点包括简单的装置结构、相对容易的制造、广泛的氨气含量感测范围（1-1000 ppm NH ₃ /空气）和较低的成本。