Materials Research Centre, Indian Institute of Science, Bangalore 560012, India.
Sci Rep. 2013;3:2082. doi: 10.1038/srep02082.
Room temperature operation, low detection limit and fast response time are highly desirable for a wide range of gas sensing applications. However, the available gas sensors suffer mainly from high temperature operation or external stimulation for response/recovery. Here, we report an ultrasensitive-flexible-silver-nanoparticle based nanocomposite resistive sensor for ammonia detection and established the sensing mechanism. We show that the nanocomposite can detect ammonia as low as 500 parts-per-trillion at room temperature in a minute time. Furthermore, the evolution of ammonia from different chemical reactions has been demonstrated using the nanocomposite sensor as an example. Our results demonstrate the proof-of-concept for the new detector to be used in several applications including homeland security, environmental pollution and leak detection in research laboratories and many others.
室温操作、低检测限和快速响应时间是广泛的气体传感应用所需要的。然而，现有的气体传感器主要由于高温操作或外部刺激而需要响应/恢复。在这里，我们报告了一种基于超灵敏柔性银纳米粒子的纳米复合材料电阻传感器，用于氨气检测，并建立了传感机制。我们表明，该纳米复合材料在室温下仅需一分钟即可检测到低至 500 万亿分之一的氨气。此外，还使用该纳米复合材料传感器演示了不同化学反应中氨的演变。我们的结果证明了新探测器在包括国土安全、环境污染和研究实验室泄漏检测等几个应用领域的概念验证。
