Mohammadzadeh Mohammad Reza, Hasani Amirhossein, Hussain Tanveer, Ghanbari Hamidreza, Fawzy Mirette, Abnavi Amin, Ahmadi Ribwar, Kabir Fahmid, De Silva Thushani, Rajapakse R K N D, Adachi Michael M
School of Engineering Science, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada.
Department of Physics and MonArk NSF Quantum Foundry, Montana State University, Bozeman, MT, 59717, USA.
Small. 2024 Dec;20(49):e2402464. doi: 10.1002/smll.202402464. Epub 2024 Jul 26.
Volatile organic compound (VOC) sensors have a broad range of applications including healthcare monitoring, product quality control, and air quality management. However, many such applications are demanding, requiring sensors with high sensitivity and selectivity. 2D materials are extensively used in many VOC sensing devices due to their large surface-to-volume ratio and fascinating electronic properties. These properties, along with their exceptional flexibility, low power consumption, room-temperature operation, chemical functionalization potential, and defect engineering capabilities, make 2D materials ideal for high-performance VOC sensing. Here, a 2D MoS/Te heterojunction is reported that significantly improves the VOC detection compared to MoS and Te sensors on their own. Density functional theory (DFT) analysis shows that the MoS/Te heterojunction significantly enhances the adsorption energy and therefore sensing sensitivity of the sensor. The sensor response, which denotes the percentage change in the sensor's conductance upon VOC exposure, is further enhanced under photo-illumination and zero-bias conditions to values up to ≈7000% when exposed to butanone. The MoS/Te heterojunction is therefore a promising device architecture for portable and wearable sensing applications.
挥发性有机化合物（VOC）传感器具有广泛的应用，包括医疗保健监测、产品质量控制和空气质量管理。然而，许多此类应用要求苛刻，需要具有高灵敏度和选择性的传感器。二维材料因其大的表面积与体积比和迷人的电子特性而被广泛应用于许多VOC传感设备中。这些特性，连同其卓越的柔韧性、低功耗、室温操作、化学功能化潜力和缺陷工程能力，使二维材料成为高性能VOC传感的理想选择。在此，报道了一种二维MoS/Te异质结，与单独的MoS和Te传感器相比，它显著提高了VOC检测能力。密度泛函理论（DFT）分析表明，MoS/Te异质结显著提高了吸附能，从而提高了传感器的传感灵敏度。传感器响应表示VOC暴露时传感器电导的百分比变化，在光照和零偏置条件下进一步增强，暴露于丁酮时高达≈7000%。因此，MoS/Te异质结是用于便携式和可穿戴传感应用的有前途的器件架构。
