Huang Baoyu, Wang Xiaoyu, Sun Shupeng, Zhao Zixuan, Miao Yuxuan, Wang Nan, Li Xiaogan
School of Integrated Circuits, Dalian University of Technology, Dalian, Liaoning 116024, PR China.
School of Integrated Circuits, Dalian University of Technology, Dalian, Liaoning 116024, PR China.
J Hazard Mater. 2025 Aug 15;494:138522. doi: 10.1016/j.jhazmat.2025.138522. Epub 2025 May 8.
Recently, as a member of transition metal dichalcogenides (TMDs), MoTe and its heterojunctions have gradually become a research hotspot in gas sensing due to their unique properties. In this study, MoTe/TiO heterojunctions were prepared using a simple hydrothermal method, and TiO nanoparticles were uniformly anchored on the surface of flake MoTe. Compared with the single-phase MoTe, the MoTe/TiO heterojunction based sensor demonstrates excellent ammonia detection capabilities at room temperature (22 ± 1℃). The sensor's response values to 1 ppm and 30 ppm ammonia are 28 % and 168 %, respectively, which are six times and three times greater than those of the single-component MoTe material. The recovery time for the sensor detecting 30 ppm ammonia has been reduced from 430 s to 239 s. Furthermore, the sensor exhibits excellent selectivity, repeatability, time stability, and a lower detection limit (500 ppb). Analysis indicates that the enhancement in sensing performance is attributed to the formation of numerous nanoscale p-n heterojunctions between MoTe and TiO nanoparticles. Moreover, density functional theory (DFT) calculations have confirmed that the presence of heterojunctions enhances the electron transfer efficiency between ammonia and the sensing materials.
最近，作为过渡金属二硫属化物（TMDs）的一员，碲化钼（MoTe）及其异质结由于其独特的性质逐渐成为气体传感领域的研究热点。在本研究中，采用简单的水热法制备了MoTe/TiO异质结，TiO纳米颗粒均匀地锚定在片状MoTe表面。与单相MoTe相比，基于MoTe/TiO异质结的传感器在室温（22±1℃）下表现出优异的氨气检测能力。该传感器对1 ppm和30 ppm氨气的响应值分别为28%和168%，分别是单组分MoTe材料的6倍和3倍。传感器检测30 ppm氨气的恢复时间从430 s缩短至239 s。此外，该传感器具有优异的选择性、重复性、时间稳定性和较低的检测限（500 ppb）。分析表明，传感性能的提高归因于MoTe与TiO纳米颗粒之间形成了大量的纳米级p-n异质结。此外，密度泛函理论（DFT）计算证实，异质结的存在提高了氨气与传感材料之间的电子转移效率。
