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Investigation on visible light assisted gas sensing ability of multi-walled carbon nanotubes coated with pyrene based organic molecules
Physica E: Low-dimensional Systems and Nanostructures ( IF 3.3 ) Pub Date : 2020-05-26 , DOI: 10.1016/j.physe.2020.114232
Manoharan Elakia , Marappan Gobinath , Yuvaraj Sivalingam , Elumalai Palani , Soumyajit Ghosh , Venkatramaiah Nutalapati , Velappa Jayaraman Surya

In this work, we have investigated the visible light assisted gas sensing properties of multiwalled carbon nanotubes (MWCNTs) functionalized with two organic molecules namely pyrene tetratopic ligands (PTL), and 1-pyrene acetic acid (PAA). Structural, optical and electrical properties have been examined on pure and functionalized samples using FESEM, Raman spectroscopy, UV–Visible spectroscopy, Photoluminescence (PL) spectroscopy, and current -voltage (I–V) characteristics. Sensor devices have been fabricated and tested in a gas sensor setup by passing saturated vapours of different VOCs like ethanol, n-hexane and triethylamine under dark and visible light conditions. Scanning Kelvin probe (SKP) studies have demonstrated that pyrene-MWCNTs hybrids significantly alter the contact potential difference upon interaction with volatile organic compounds (VOCs) and the response depends on the functional groups. The PTL+MWCNTs (sensitivity = 9.99 × 10−4 ppm−1) hybrid has outperformed when compared to PAA functionalized counterparts (sensitivity = 2.27 × 10−5 ppm−1) with triethylamine exposure. The presence of additional –COOH groups in PTL furnishes strong intermolecular hydrogen bonding through donor-acceptor interactions with the VOCs. Overall, our results suggests that the MWCNTs coated with pyrene molecules bearing suitable functional groups can be efficient sensors for detection of VOCs.



中文翻译:

pyr基有机分子包覆的多壁碳纳米管的可见光辅助气体传感能力研究

在这项工作中,我们研究了被两个有机分子即pyr四位配体(PTL)和1-py乙酸(PAA)功能化的多壁碳纳米管(MWCNT)的可见光辅助气体传感特性。已使用FESEM,拉曼光谱,UV-可见光谱,光致发光(PL)光谱和电流-电压(IV)特性对纯净和功能化样品进行了结构,光学和电学性能检查。通过在黑暗和可见光条件下让不同VOC的饱和蒸气(例如乙醇,正己烷和三乙胺)通过,可以在气体传感器设置中制造并测试传感器设备。扫描开尔文探针(SKP)研究表明,pyr-MWCNTs杂化物在与挥发性有机化合物(VOC)相互作用时会显着改变接触电势差,并且响应取决于官能团。PTL + MWCNT(灵敏度= 9.99×10与暴露于三乙胺的PAA官能化对应物(灵敏度= 2.27×10 -5  ppm -1)相比,−4  ppm -1)杂化物表现出色。PTL中额外的–COOH基团的存在通过与VOC的供体-受体相互作用提供了强大的分子间氢键。总体而言,我们的结果表明,涂​​有带有合适官能团的pyr分子的MWCNT可以成为检测VOC的有效传感器。

更新日期:2020-05-26
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