Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, UK.
Sensors (Basel). 2011;11(3):2478-87. doi: 10.3390/s110302478. Epub 2011 Feb 28.
This work explores the use of a polymer of intrinsic microporosity (PIM-1) as the active layer within a laser sensor to detect nitroaromatic-based explosive vapors. We show successful detection of dinitrobenzene (DNB) by monitoring the real-time photoluminescence. We also show that PIM-1 has an inherent memory, so that it accumulates the analyte during exposure. In addition, the optical gain and refractive index of the polymer were studied by amplified spontaneous emission and variable-angle ellipsometry, respectively. A second-order distributed feedback PIM-1 laser sensor was fabricated and found to show an increase in laser threshold of 2.5 times and a reduction of the laser slope efficiency by 4.4 times after a 5-min exposure to the DNB vapor. For pumping at 2 times threshold, the lasing action was stopped within 30 s indicating that PIM-1 has a very fast responsivity and as such has a potential sensing ability for ultra-low-concentration explosives.
这项工作探索了使用聚合物固有微孔（PIM-1）作为激光传感器中的活性层来检测基于硝基芳烃的爆炸物蒸气。我们通过监测实时光致发光成功检测到了二硝基苯（DNB）。我们还表明，PIM-1 具有内在记忆，因此它在暴露期间会累积分析物。此外，分别通过放大自发发射和可变角椭圆偏振术研究了聚合物的光增益和折射率。制造了第二个分布式反馈 PIM-1 激光传感器，并发现其在 5 分钟暴露于 DNB 蒸气后，激光阈值增加了 2.5 倍，激光斜率效率降低了 4.4 倍。在 2 倍阈值的情况下进行泵浦，激光作用在 30 秒内停止，这表明 PIM-1 具有非常快的响应能力，因此具有用于超低浓度爆炸物的潜在传感能力。
