Nowadays, volatile organic compound (VOC) detection is imperative to ensure environmental safety in industry and indoor environments, as well as to monitor human health in medical diagnosis. Gas sensors with the best sensor response, selectivity, and stability are in high demand. Simultaneously, the advancement of nanotechnology facilitates novel nanomaterial-based gas sensors with superior sensor characteristics and low power consumption. Recently, boron nitride, a 2D material, has emerged as an excellent candidate for gas sensing and demonstrated exceptional sensing characteristics for new-generation gas sensing devices. Herein, ultrathin porous boron nitride nanosheets (BNNSs) with large lateral sizes were synthesized using a facile synthesis approach, and their material characteristics were investigated utilizing a variety of analytical techniques, including X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. A BNNS-coated cladding-modified fiber optic sensor (FOS) probe was prepared and employed for VOC (ammonia, ethanol, and acetone) sensing across concentrations varying from 0 to 300 ppm. The BNNSs-coated FOS demonstrated better selectivity toward 300 ppm ammonia, and specifically annealed BNNSs displayed a maximum sensor response of 55% along with a response/recovery times of 15 s/34 s compared to its counterparts. The superior ammonia sensing performances could be attributed to the formation of ultrathin nanosheets and a porous surface with slit-like features in hexagonal boron nitride.

中文翻译：

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涂有多层六方氮化硼纳米片 (BNNS) 的光纤传感器用于检测挥发性有机化合物


如今，挥发性有机化合物（VOC）检测对于确保工业和室内环境的环境安全以及医疗诊断中监测人体健康势在必行。具有最佳传感器响应、选择性和稳定性的气体传感器的需求量很大。同时，纳米技术的进步促进了基于纳米材料的新型气体传感器具有优异的传感器特性和低功耗。最近，氮化硼（一种二维材料）已成为气体传感的绝佳候选材料，并为新一代气体传感设备展示了卓越的传感特性。在此，采用简便的合成方法合成了具有大横向尺寸的超薄多孔氮化硼纳米片（BNNS），并利用各种分析技术研究了其材料特性，包括X射线衍射、傅里叶变换红外光谱、紫外光谱、X射线光电子能谱和扫描电子显微镜。制备了 BNNS 涂层包层改良光纤传感器 (FOS) 探头，并用于 0 至 300 ppm 浓度范围内的 VOC（氨、乙醇和丙酮）传感。与同类产品相比，涂覆 BNNS 的 FOS 对 300 ppm 氨表现出更好的选择性，并且经过专门退火的 BNNS 表现出 55% 的最大传感器响应以及 15 s/34 s 的响应/恢复时间。优异的氨传感性能可归因于六方氮化硼中超薄纳米片和具有狭缝状特征的多孔表面的形成。