Repeatability and Stability of Room-Temperature Acetone Sensor Based on TiO2 Nanotubes: Influence of Stoichiometry Variation
Repeatability and Stability of Room-Temperature Acetone Sensor Based on TiO2 Nanotubes: Influence of Stoichiometry Variation
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DOI：
10.1109/tdmr.2014.2347376
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发表时间：
2014-12-01
影响因子：
2
通讯作者：
Bhattacharyya, P.
中科院分区：
文献类型：
--
作者：
Bhowmik, B.;Hazra, A.;Bhattacharyya, P.
电化学生长的TiO2纳米管（NT）的氧空位（OV）变化是通过改变阳极氧化过程中电解质（NH4F与乙二醇）中水的体积的化学计量变化来实现的。通过改变混合电解质中的含水量（体积比为0%、2%和10%），纳米碳纳米管的形态和化学计量学发生了巨大变化。在通过x射线衍射、场发射扫描电镜和光致发光光谱对其进行详细的结构和形态表征后，采用三种不同的阳极氧化纳米形式研究了室温丙酮传感。发现传感器的可靠性（即重复性和稳定性）及其响应幅度受到化学计量学变化的极大影响。结果表明，体积分数为2%的纳米碳纳米管具有最佳的响应幅度和重复性，而体积分数为10%的纳米碳纳米管具有最佳的稳定性。结果表明，化学计量学（OVs）和表面体积比的优化是决定响应幅度和重复性的重要因素。相反，稳定性主要只受化学计量的支配。
The oxygen vacancy (OV) variation of the electrochemically grown TiO2 nanotube (NT) was achieved through stoichiometry variation by varying the volume of water in the electrolyte (NH4F with ethylene glycol) during anodization. By varying the water content (0%, 2%, and 10% by volume) in the mixed electrolyte, the morphology and stoichiometry of NTs were found to be varied dramatically. After detailed structural and morphological characterization by X-ray diffraction and field-emission scanning electron microscope and photoluminescence spectroscopy, the room-temperature acetone sensing was investigated by employing three distinct nanoforms derived through anodization. The reliability (i.e., repeatability and stability) of the sensors, as well as their response magnitude, was found to be greatly influenced by the variation in stoichiometry. The NTs derived with 2 volume percent H2O was found to offer the most promising response magnitude with excellent repeatability, whereas the best stability was ensured in the case of the NTs derived with 10 volume percent H2O. It was observed that an optimization of stoichiometry (OVs) and the surface-to-volume ratio is important in determining the response magnitude and repeatability. On the contrary, the stability is mainly governed by the stoichiometry only.