包覆有功能化MWCNT的Pd掺杂SnO2的传感器性能
Sensor properties of Pd doped SnO2 nanofiber enshrouded with functionalized MWCNT
摘要：
在这项工作中，氧化锡（SnO 2）/多壁碳纳米管（MWCNT）复合材料为基础的乙醇传感器，具有快速响应/恢复行为，大的灵敏度，和良好的选择性被证明。首先，采用静电纺丝技术在叉指电极（IDE）上制备了Pd掺杂的SnO 2（SnO 2-Pd）纳米纤维，然后在600 ℃下煅烧2 h。然后，将羧酸改性的多壁碳纳米管（MWCNT-COOH）滴加到纳米纤维上并在室温下干燥。接下来，通过场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）和热重分析（TGA）对薄膜进行表征。最后，分析了传感器对乙醇（ETH）、甲苯（TOL）、三氯乙烯（TCE）、丙酮（ACE）和二元混合物的化学传感行为。结果表明，提高温度和气体浓度，导致增加的传感器响应的SnO 2-Pd双金属系统。而MWCNT-COOH包覆的SnO 2-Pd/SnO 2复合体系中，没有发现一般规律。为该复合结构提供了一种新的传感机理。
英文摘要：
In this work, tin oxide (SnO2)/multi-walled carbon nanotube (MWCNT) composite based ethanol sensor that exhibits fast response/recovery behaviour, large sensitivity, and good selectivity was demonstrated. First, Pd doped SnO2 (SnO2-Pd) nanofibers was prepared on the interdigitated electrodes (IDE) using electrospinning technique, followed by calcination at 600 0C for 2 h. Then, carboxylic acid modified multi-walled carbon nanotube (MWCNT-COOH) was dropped on the nanofibers and allowed to dry at RT. Next, the thin films were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Finally, chemical sensing behaviors of the sensors were analyzed against to ethanol (ETH), toluene (TOL), trichloroethylene (TCE), acetone (ACE) and binary mixing with water. It was demonstrated that increasing the temperature and gas concentration has led to increased sensor response for SnO2-Pd nanofiber system. However, there was no general rule found for MWCNT-COOH coated SnO2-Pd nanofiber system. A novel sensing mechanism was offered for the composite structure.
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