Graphene-TiS $_3$异质结用于室温下的选择性极性蒸气传感
Graphene-TiS$_3$ heterojunction for selective polar vapor sensing at room temperature
摘要：
本文研究了石墨烯-TiS_3二维异质结材料和TiS_3纳米带的室温极性气敏特性。采用化学气相传输法（CVT）合成了TiS 3纳米带，并通过扫描电子显微镜（SEM）、高分辨透射电子显微镜（HRTEM）、能量色散X射线谱（EDS）、X射线衍射（XRD）、拉曼光谱（Raman）和傅里叶变换红外光谱（FT-IR）等分析手段对样品的结构进行了表征。通过观察其电子行为的变化来评估TiS 3纳米带的气敏性能。感测装置在2D异质结Gr-TiS 3-Gr架构中用金触点和光刻图案化的石墨烯（Gr）电极制造。据观察，金接触的TiS 3器件具有相当线性的I-V特性，而Gr-TiS 3-Gr异质结形成具有较高肖特基势垒（250 meV）的接触。在室温下，相对湿度为55%和不同的乙醇蒸汽浓度（从2到20 ppm变化）的传感器的I-V响应记录。I-V曲线表明，通过吸附水和乙醇分子，Gr-TiS 3-Gr的电阻增加，具有相对高的传感响应（在2 ppm下约3353%）。我们的研究结果表明，选择性和稳定的响应，以低浓度的乙醇蒸汽（2 ppm），可以实现在室温下的瞬态响应和恢复时间约为6秒和40秒，分别。我们提出的设计展示了一种新的选择性分子识别方法，使用分析物蒸汽和2D材料的异质结之间的极性相互作用。
英文摘要：
In this work, the room temperature polar vapor sensing behavior of two dimentional (2D) heterojunction Graphene-TiS3 materials and TiS3 nanoribbons is investigated. TiS3 nanoribbons were synthesized via chemical vapor transport (CVT) and their structure was investigated by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), energy dispersive X- ray spectroscopy (EDS), X-ray diffraction (XRD), Raman spectroscopy and Fourier transform infrared spectroscopy (FT-IR) analysis. The gas sensing performance of the TiS3 nanoribbons was assessed through the observed changes in their electronic behavior. Sensing devices were fabricated with gold contacts and with lithographically patterned graphene (Gr) electrodes in a 2D heterojunction Gr-TiS3-Gr architecture.. It is observed that the gold contacted TiS3 device has a rather linear I-V behavior while the Gr-TiS3-Gr heterojunction forms a contact with a higher Schottky barrier (250 meV). I-V responses of the sensors were recorded at room temperature with a relative humidity of 55% and for different ethanol vapor concentrations (varying from 2 to 20 ppm). I-V plots indicated an increase in the resistance of Gr-TiS3-Gr by the adsorption of water and ethanol molecules with relatively high sensing response (~3353% at 2 ppm). Our results reveal that selective and stable responses to a low concentration of ethanol vapor (2 ppm) can be achieved at room temperature with transient response and recovery times of around 6 s and 40 s, respectively. Our proposed design demonstrate a new approach for selective molecular recognition using polar interactions between analyte vapors and heterojunctions of 2D-materials.
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