Zulkefli Amir, Mukherjee Bablu, Sahara Ryoji, Hayakawa Ryoma, Iwasaki Takuya, Wakayama Yutaka, Nakaharai Shu
International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
ACS Appl Mater Interfaces. 2021 Sep 15;13(36):43030-43038. doi: 10.1021/acsami.1c10054. Epub 2021 Aug 31.
Using a single-device two-dimensional (2D) rhenium disulfide (ReS) field-effect transistor (FET) with enhanced gas species selectivity by light illumination, we reported a selective and sensitive detection of volatile organic compound (VOC) gases. 2D materials have the advantage of a high surface-area-to-volume ratio for high sensitivity to molecules attached to the surface and tunable carrier concentration through field-effect control from the back-gate of the channel, while keeping the top surface open to the air for chemical sensing. In addition to these advantages, ReS has a direct band gap also in multilayer cases, which sets it apart from other transition-metal dichalcogenides (TMDCs). We take advantage of the effective response of ReS to light illumination to improve the selectivity and gas-sensing efficiency of a ReS-FET device. We found that light illumination modulates the drain current response in a ReS-FET to adsorbed molecules, and the sensing activity differs depending on the gas species used, such as acetone, ethanol, and methanol. Furthermore, wavelength and carrier density rely on certain variations in light-modulated sensing behaviors for each chemical. The device will distinguish the gas concentration in a mixture of VOCs using the differences induced by light illumination, enhancing the selectivity of the sensor device. Our results shed new light on the sensing technologies for realizing a large-scale sensor network in the Internet-of-Things era.
我们报道了一种使用单器件二维（2D）二硫化铼（ReS）场效应晶体管（FET）通过光照增强气体种类选择性的方法，该方法可对挥发性有机化合物（VOC）气体进行选择性和灵敏检测。二维材料具有高表面积与体积比的优势，这使其对附着在表面的分子具有高灵敏度，并且可通过来自沟道背栅的场效应控制来调节载流子浓度，同时保持顶表面暴露于空气中以进行化学传感。除了这些优势外，二硫化铼在多层情况下也具有直接带隙，这使其有别于其他过渡金属二硫属化物（TMDCs）。我们利用二硫化铼对光照的有效响应来提高二硫化铼场效应晶体管器件的选择性和气敏效率。我们发现光照会调制二硫化铼场效应晶体管中对吸附分子的漏极电流响应，并且传感活性会因所使用的气体种类（如丙酮、乙醇和甲醇）而有所不同。此外，波长和载流子密度取决于每种化学物质在光调制传感行为中的某些变化。该器件将利用光照引起的差异来区分挥发性有机化合物混合物中的气体浓度，从而提高传感器器件的选择性。我们的结果为在物联网时代实现大规模传感器网络的传感技术提供了新的思路。
