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首页> 外文期刊>Nanotechnology >The effect of purification of single-walled carbon nanotube bundles on the alcohol sensitivity of nanocomposite Langmuir-Blodgett films for SAW sensing applications
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The effect of purification of single-walled carbon nanotube bundles on the alcohol sensitivity of nanocomposite Langmuir-Blodgett films for SAW sensing applications

机译：单壁碳纳米管束的纯化对用于声表面波传感应用的纳米复合Langmuir-Blodgett膜的酒精敏感性的影响

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HiPco (high-pressure CO dissociation process) single-walled carbon nanotube (SWCNT) bundles containing Fe particles were purified in a two-step purification process by thermal annealing in oxygen and post-treatment in HCl. Nanocomposite films of pristine and purified SWCNTs embedded in an organic matrix of cadmium arachidate (CdA) were prepared by a Langmuir-Blodgett (LB) molecular engineering technique with a fixed weight filler content of 75 wt percent onto a surface acoustic wave (SAW) transducer operating as an oscillator at a frequency of 433 MHz. The raw and purified samples were characterized at various stages of the purification process using thermogravimetric analysis (TGA), high-resolution transmission electron microscopy (HR-TEM), along with energy-dispersive x-ray spectroscopy (EDS), field emission scanning electron microscopy (FE-SEM) and x-ray diffraction (XRD). Functional characterizations of the SWCNT-nanocomposite-based SAW sensors were investigated towards methanol, isopropanol and ethanol, and demonstrated high sensitivity, reversibility, fast response and ppm level detection at room temperature. Results indicate that the sensitivity of the SAW sensors based on a nanocomposite film of oxygen-annealed SWCNTs is enhanced to the alcohols tested at room temperature. Purification of the SWCNTs in the nanocomposite film affects the SAW sensitivity to alcohol by modulating the sensing properties. The sensing mechanisms are analysed and discussed.
机译：含Fe颗粒的HiPco（高压CO解离过程）单壁碳纳米管（SWCNT）束通过氧气中的热退火和HCl后处理的两步纯化过程进行纯化。通过Langmuir-Blodgett（LB）分子工程技术，以75 wt％的固定重量填充物，在表面声波（SAW）传感器上制备了嵌入到花生四烯酸镉（CdA）有机基质中的原始和纯化的SWCNT的纳米复合膜。在433 MHz的频率下作为振荡器工作。使用热重分析（TGA），高分辨率透射电子显微镜（HR-TEM）以及能量色散X射线光谱（EDS），场发射扫描电子在纯化过程的各个阶段对原始和纯化的样品进行表征显微镜（FE-SEM）和X射线衍射（XRD）。研究了SWCNT-纳米复合表面声表面波传感器对甲醇，异丙醇和乙醇的功能特性，并证明了其在室温下的高灵敏度，可逆性，快速响应和ppm级检测。结果表明，基于氧退火的SWCNTs纳米复合膜的SAW传感器对在室温下测试的醇类的灵敏度有所提高。纳米复合膜中SWCNT的纯化通过调节感测特性影响SAW对酒精的敏感性。分析和讨论了感应机制。

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