Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University , Changchun 130025, P. R. China.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, P. R. China.
ACS Appl Mater Interfaces. 2017 Feb 8;9(5):4692-4700. doi: 10.1021/acsami.6b13520. Epub 2017 Jan 30.
The design of appropriate composite materials with unique surface structures is an important strategy to achieve ideal chemical gas sensing. In this paper, efficient and selective detection of formaldehyde vapor has been realized by a gas sensor based on porous GaInO nanofibers assembled by small building blocks. By tuning the Ga/In atomic ratios in the materials, crystallite phase, nanostructure, and band gap of as-obtained GaInO nanofibers can be rationally altered. This further offers a good opportunity to optimize the gas sensing performances. In particular, the sensor based on porous GaInO nanofibers assembled by small nanoparticles (∼4.6 nm) exhibits best sensing performances. Toward 100 ppm formaldehyde, its highest response (R/R = 52.4, at 150 °C) is ∼4 times higher than that of the pure InO (R/R = 13.0, at 200 °C). Meanwhile, it has superior ability to selectively detect formaldehyde against other interfering volatile organic compound gases. The significantly improved sensing performance makes the GaInO sensor very promising for selective detection of formaldehyde.
设计具有独特表面结构的合适复合材料是实现理想化学气体传感的重要策略。本文通过基于由小结构单元组装的多孔 GaInO 纳米纤维的气体传感器，实现了对甲醛蒸气的高效和选择性检测。通过调整材料中的 Ga/In 原子比，可以合理改变所获得的 GaInO 纳米纤维的晶相、纳米结构和带隙。这进一步为优化气体传感性能提供了良好的机会。特别是，基于由小纳米颗粒（约 4.6nm）组装的多孔 GaInO 纳米纤维的传感器表现出最佳的传感性能。对于 100ppm 的甲醛，其最高响应（R/R=52.4，在 150°C）比纯 InO（R/R=13.0，在 200°C）高约 4 倍。同时，它具有优越的选择性检测甲醛的能力，对其他干扰挥发性有机化合物气体具有良好的选择性。显著提高的传感性能使得 GaInO 传感器非常有前途用于甲醛的选择性检测。
