Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences Nanyang Technological University , Nanyang Link 21, Singapore 637371.
Department of Inorganic Chemistry, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague 6, Czech Republic.
ACS Nano. 2018 Jan 23;12(1):464-473. doi: 10.1021/acsnano.7b06853. Epub 2017 Dec 18.
Layered materials, like transition metal dichalcogenides, exhibit broad spectra with outstanding properties with huge application potential, whereas another group of related materials, layered transition metal trichalcogenides, remains unexplored. Here, we show the broad application potential of this interesting structural type of layered tantalum trisulfide prepared in a form of nanofibers. This material shows tailorable attractive electronic properties dependent on the tensile strain applied to it. Structure of this so-called orthorhombic phase of TaS grown in a form of long nanofibers has been solved and refined. Taking advantage of these capabilities, we demonstrate a highly specific impedimetric NO gas sensor based on TaS nanofibers as well as construction of photodetectors with excellent responsivity and field-effect transistors. Various flexible substrates were used for the construction of a NO gas sensor. Such a device exhibits a low limit of detection of 0.48 ppb, well under the allowed value set by environmental agencies for NO (50 ppb). Moreover, this NO gas sensor also showed excellent selectivity in the presence of common interferences formed during fuel combustion. TaS nanofibers produced in large scale exhibited excellent broad application potential for various types of devices covering nanoelectronic, optoelectronic, and gas-sensing applications.
层状材料，如过渡金属二卤化物，具有广泛的光谱和出色的性能，具有巨大的应用潜力，而另一组相关材料，层状过渡金属三卤化物，尚未得到探索。在这里，我们展示了这种有趣的层状二硫化钽结构类型的广泛应用潜力，它以纳米纤维的形式制备。这种材料表现出可调节的吸引人的电子特性，取决于施加的拉伸应变。以长纳米纤维形式生长的所谓正交相 TaS 的结构已被解决和细化。利用这些特性，我们展示了一种基于 TaS 纳米纤维的高特异性阻抗式 NO 气体传感器，以及具有优异响应性和场效应晶体管的光电探测器的构建。各种柔性基板被用于构建 NO 气体传感器。该器件的检测限低至 0.48 ppb，远低于环境机构为 NO（50 ppb）设定的允许值。此外，该 NO 气体传感器在存在燃料燃烧过程中形成的常见干扰时也表现出优异的选择性。大规模生产的 TaS 纳米纤维在各种类型的器件中具有出色的广泛应用潜力，涵盖了纳米电子、光电和气体传感应用。
