The chemical vapour sensing behaviour of pristine and variously modified hexagonal boron nitride (hBN) nanostructures was investigated towards the polar protic analyte in the form of ammonia. Morphological characterization with TEM revealed formation of well-define shaped and crystal sized hBN flakes (2.9 0. 7 m to 3.3 0.3 m) by using a low temperature and atmospheric pressure modified polymer derived ceramics (PDCs) route. Room temperature chemical sensing studies showed that the hBN-based devices were sensitive to ammonia, at sensitivity values of 2.8 10⁻² ppm⁻¹ for the pristine hBN flakes, and 2.0 10⁻² ppm⁻¹, 2.4 10⁻² ppm⁻¹, 2.1 10⁻² ppm⁻¹ for the 2.5, 5 and 10 wt.% BaF₂ modified hBN flakes, respectively. On the contrary, improvement in structure for the 5 wt.% BaF₂ modified hBN flakes had detrimental influence on the detection performance of ammonia, as evidenced by the poor LoD value of 49.7 ppm, in comparison to 1.1, 2.4 and 1.7 ppm for the pristine, 2.5, and 10 wt.% BaF₂ modified hBN flakes, respectively. The improved sensing performance was attributed to the presence of nitrogen vacancies generated during the modification process, as well as the presence of impurities. Indeed, the values measured were higher than those reported for other 2D nanomaterial based sensors. This study demonstrates the critical role played by structural properties on the surface chemistry in the ammonia sensing properties of hBN flakes. Generally, the study highlighted the potential application of hBN nanostructured materials for detection of ammonia vapours at room temperature.

针对氨形式的极质子分析物研究了原始和各种改性的六方氮化硼 ( h BN) 纳米结构的化学蒸汽传感行为。TEM 的形态特征表明形成了明确的形状和晶体尺寸的h BN 薄片 (2.9 0. 7米至 3.3 0.3 m) 通过使用低温和大气压改性聚合物衍生陶瓷 (PDC) 路线。室温化学传感研究表明，基于h BN 的装置对氨敏感，原始h BN 薄片的灵敏度值为 2.8 10 ^-2 ppm ^-1和 2.0 10 ^-2 ppm ^-1、2.4 10 ^-2 ppm ^-1、2.1 10 ^-2 ppm ^{-1 分别}用于 2.5、5 和 10 wt.% BaF ₂改性的h BN 薄片。相反，5 wt.% BaF ₂改性hBN 薄片对氨的检测性能有不利影响，49.7 ppm 的低 LoD 值证明了这一点，而原始、2.5 和 10 wt.% BaF ₂改性h BN 薄片的LoD 值为 1.1、2.4 和 1.7 ppm ，分别。改进的传感性能归因于改性过程中产生的氮空位以及杂质的存在。事实上，测量的值高于其他基于二维纳米材料的传感器报告的值。这项研究证明了结构特性对表面化学性质在h BN 薄片的氨传感特性中所起的关键作用。总的来说，该研究强调了h的潜在应用用于在室温下检测氨蒸气的 BN 纳米结构材料。