Sim Daniel, Huang Tiffany, Kim Steve S
Air Force Research Laboratory (AFRL), 711th Human Performance Wing, Wright-Patterson Air Force Base, Dayton, OH 45433, USA.
Integrative Health & Performance Sciences Division, UES Inc., Dayton, OH 45432, USA.
Sensors (Basel). 2023 Oct 14;23(20):8469. doi: 10.3390/s23208469.
Biorecognition element (BRE)-based carbon nanotube (CNT) chemiresistors have tremendous potential to serve as highly sensitive, selective, and power-efficient volatile organic compound (VOC) sensors. While many research groups have studied BRE-functionalized CNTs in material science and device development, little attention has been paid to optimizing CNT density to improve chemiresistor performance. To probe the effect of CNT density on VOC detection, we present the chemiresistor-based sensing results from two peptide-based CNT devices counting more than 60 different individual measurements. We find that a lower CNT density shows a significantly higher noise level and device-to-device variation while exhibiting mildly better sensitivity. Further investigation with SEM images suggests that moderately high CNT density with a stable connection of the nanotube network is desirable to achieve the best signal-to-noise ratio. Our results show an essential design guideline for tuning the nanotube density to provide sensitive and stable chemiresistors.
基于生物识别元件（BRE）的碳纳米管（CNT）化学电阻器作为高灵敏度、高选择性且功耗低的挥发性有机化合物（VOC）传感器具有巨大潜力。尽管许多研究团队在材料科学和器件开发方面对BRE功能化的碳纳米管进行了研究，但在优化碳纳米管密度以提高化学电阻器性能方面却很少受到关注。为了探究碳纳米管密度对VOC检测的影响，我们展示了基于两种肽基碳纳米管器件的化学电阻传感结果，这些结果包含60多个不同的单独测量数据。我们发现，较低的碳纳米管密度显示出明显更高的噪声水平和器件间差异，同时灵敏度略高。通过扫描电子显微镜图像的进一步研究表明，适度高的碳纳米管密度以及纳米管网络的稳定连接对于实现最佳信噪比是可取的。我们的结果展示了一个重要的设计指南，用于调整纳米管密度以提供灵敏且稳定的化学电阻器。
