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Amorphization of cobalt monoxide nanocrystals and related explosive gas sensing applications

机译：一氧化钴纳米晶体的非晶化及其相关爆炸性气体传感应用

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Amorphous nanomaterials have attracted attention due to their excellent performances, highly comparable to their crystalline counterparts. Sensor materials with amorphous phases are usually evaluated to be unsuitable for sensors because of poor performance. As a matter of fact, amorphous nanomaterials have rather unique sensor behaviors. Here, we report the amorphousization of cobalt monoxide (CoO) nanocrystals driven by a unique process involved in laser ablation in liquid (LAL). We also established that a fast and nonequilibrium process created by LAL results in the amorphousization of nanocrystals. The as-prepared amorphous CoO (a-CoO) nanoflakes possess a high aspect ratio, which showed good sensing of explosive gases. The fabricated gas sensor can detect CO and H-2 at levels as low as 5 and 10 ppm, respectively, at 100 degrees C. The performance characteristics of this sensor, including high sensitivity, low working temperature, and low detection limit, are superior to those of sensors made with crystalline phase oxides. Meanwhile, a temperature-dependent p-n transition was observed in the sensor's response to CO, suggesting that the sensing properties can be tailored by changing the carrier type, thus tuning the selectivity of sensors to different gases. These findings demonstrate the potential applications of amorphous nanomaterials as gas sensor components.
机译：非晶态纳米材料由于其出色的性能而引起了人们的关注，与晶体对应物高度可比。通常评估具有非晶相的传感器材料，因为其性能较差，因此不适合用于传感器。事实上，非晶纳米材料具有相当独特的传感器性能。在这里，我们报告由参与液体激光烧蚀（LAL）的独特过程驱动的一氧化钴（CoO）纳米晶体的非晶化。我们还确定了由LAL建立的快速且不平衡的过程会导致纳米晶体的非晶化。所制备的非晶态CoO（a-CoO）纳米薄片具有高的纵横比，显示出对爆炸性气体的良好感测。装配好的气体传感器可以在100摄氏度下分别检测低至5 ppm和10 ppm的水平的CO和H-2。该传感器的性能特征（包括高灵敏度，低工作温度和低检测极限）是卓越的与那些由结晶相氧化物制成的传感器相比。同时，在传感器对CO的响应中观察到了温度相关的p-n跃迁，这表明可以通过改变载流子类型来调整传感特性，从而调节传感器对不同气体的选择性。这些发现证明了非晶态纳米材料作为气体传感器组件的潜在应用。

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