Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Science, Hefei, 230031, PR China; University of Science and Technology of China, Hefei, 230026, PR China.
Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Science, Hefei, 230031, PR China.
J Hazard Mater. 2018 Sep 15;358:355-365. doi: 10.1016/j.jhazmat.2018.07.021. Epub 2018 Jul 6.
Styrene, a chronic toxic gas, is of great harm to human health. It is urgently required to develop a portable, efficient, and inexpensive method to detect this toxic gas. Chemiresistive gas sensor based on semiconductor metal-oxides is considered as one of the best candidate suited to above features, while its sensitivity and selectivity are not enough high for the applications. Herein, the ultrafine Pt NPs embellished SnO/α-FeO hollow nanoheterojunctions were achieved by in-situ reduction and subsequent calcination treatment. Particularly, such yielding products exhibited excellent styrene sensing performances with a detection limit of 50 ppb and extremely fast response/recovery time (3/15 s, respectively). More importantly, this SnO/α-FeO/Pt sensing platform revealed improved styrene selectivity against other malodorous gases. Additionally, the significant enhancement for styrene sensing response was also obtained compared to other two sensors (pristine SnO and SnO/α-FeO, respectively). Further studies demonstrated that such enhanced performances possibly be owing to the "catalytic sensitization" effect driven by Pt NPs and "electronic sensitization" effect triggered through the formation of Schottky junction as well as n-n nanoheterojunction. Based on these sensing features, it is probably great promising in the detection of styrene gas in the future.
苯乙烯是一种慢性有毒气体，对人体健康危害极大。因此，急需开发一种便携式、高效、廉价的方法来检测这种有毒气体。基于半导体金属氧化物的电阻式气体传感器被认为是最适合上述特点的候选者之一，但其灵敏度和选择性还不够高，无法满足实际应用的需求。在此，通过原位还原和随后的煅烧处理，制备了具有超细 Pt NPs 修饰的 SnO/α-FeO 空心纳米异质结。特别地，这种产物表现出优异的苯乙烯传感性能，检测限低至 50 ppb，响应/恢复时间极快（分别为 3/15 s）。更重要的是，与其他恶臭气体相比，该 SnO/α-FeO/Pt 传感平台显示出了改善的苯乙烯选择性。此外，与另外两个传感器（原始的 SnO 和 SnO/α-FeO）相比，苯乙烯传感响应也有显著增强。进一步的研究表明，这种性能的增强可能归因于 Pt NPs 驱动的“催化敏化”效应以及肖特基结和 n-n 纳米异质结形成引发的“电子敏化”效应。基于这些传感特性，该传感器有望在未来用于检测苯乙烯气体。
