We report the sensing performance of In₂O₃ nanoparticles (NPs) synthesized by a co-precipitation method for the detection of isoprene. The as-synthesized In₂O₃ NPs exhibited excellent isoprene-sensing performance compared to other previously reported isoprene sensors based on metal-oxide semiconductors. Under an exposure of 1 ppm isoprene at an optimal operating temperature of 350 ℃, the In₂O₃ NP sensor showed the highest sensing response of ∼231 with a rapid response time of ∼3 s. The low detection limit was approximately 0.001 ppm of isoprene. Furthermore, the In₂O₃ NP sensor showed a good long-term stability for 90 days by controlling the annealing time. In addition, for the sensor’s practical applications to a breath isoprene analyzer, we tested the sensing ability of the In₂O₃ NPs by integrating the sensor into a miniaturized gas analyzer based on gas chromatography (GC). The results revealed that the In₂O₃ NP sensor is sensitive and can distinctly detect 1 ppm isoprene and 10 ppm H₂ within ∼100 s in a mixture gas with other breath gases, such as acetone, CO₂, CO, and CH₄. Our study demonstrated the potential of the In₂O₃ NP sensor for application in breath isoprene analyzers by controlling the sensor’s annealing time and adopting the GC system.

我们报告了通过共沉淀法合成的异戊二烯检测方法合成的In ₂ O ₃纳米颗粒（NPs）的传感性能。与之前报道的其他基于金属氧化物半导体的异戊二烯传感器相比，合成后的In ₂ O ₃ NPs具有出色的异戊二烯传感性能。在最佳操作温度为350℃的1 ppm异戊二烯暴露下，In ₂ O ₃ NP传感器显示出约231的最高感测响应，并具有约3 s的快速响应时间。检测下限约为异戊二烯0.001 ppm。此外，In ₂ O ₃通过控制退火时间，NP传感器可显示90天的良好长期稳定性。此外，对于传感器在呼吸异戊二烯分析仪中的实际应用，我们通过将传感器集成到基于气相色谱（GC）的小型化气体分析仪中，测试了In ₂ O ₃ NPs的传感能力。结果表明，In ₂ O ₃ NP传感器灵敏，在与其他呼吸气体如丙酮，CO ₂，CO和CH ₄的混合气体中，在约100 s内可以清晰地检测到1 ppm异戊二烯和10 ppm H ₂。。我们的研究证明了In ₂ O ₃的潜力 通过控制传感器的退火时间并采用气相色谱系统，将NP传感器应用于呼吸异戊二烯分析仪中。