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首页> 外文期刊>ACS applied materials & interfaces >Effect of Humidity on Nanoparticle-Based Chemiresistors: A Comparison between Synthetic and Real-World Samples
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Effect of Humidity on Nanoparticle-Based Chemiresistors: A Comparison between Synthetic and Real-World Samples

机译：湿度对基于纳米颗粒的化学传感器的影响：合成样品与真实样品的比较

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Chemiresistors based on metal monolayer-capped nano-particles (MCNPs) are promising candidates for fast, inexpensive, and portable tracing of (bio)chemical species in the gas phase. However, the sensitivity of such sensors to humidity is problematic, limiting their reliable and reproducible application in real-world environmental conditions. In this work, we employed a compensation method to explore the effect of humidity on a single MCNP chemiresistor as well as on an array of MCNP sensors used to analyze either synthetic or real-world samples. We show that an array of MCNP chemiresistors is able to precisely detect and estimate subtle concentrations of (mixtures of) volatile organic compounds (VOCs) under variable backgrounds of 2-83% relative humidity (RH) only after humidity compensation. Humidity effects were also tested in two clinical trials aimed at detecting prostate cancer and breast cancer throughexhaled breath analysis. Analysis of the results showed improved cancer detection capabilities as a result of RH compensation, though less substantial than the impact of RH compensation on synthetic samples. This outcome is attributed to one - or a combination - of the following effects: (i) the RH variance was smaller in the breath samples than that in the synthetic samples; (ii) the VOC composition in the breath samples is less controlled than the synthetic samples; and (iii) the responses to small polar VOCs and water are not necessarily additive in breath samples. Ultimately, the results presented here could assist the development of a cost-effective, low-power method for widespread detection of VOCs in real-world applications, such as breath analysis, as well as for environmental, security, and food applications.
机译：基于金属单层封端的纳米粒子（MCNP）的化学电阻器有望在气相中快速，廉价和便携式地追踪（生物）化学物质。然而，这种传感器对湿度的敏感性是有问题的，限制了它们在现实环境条件下的可靠和可再现的应用。在这项工作中，我们采用了一种补偿方法来探索湿度对单个MCNP化学电阻器以及用于分析合成或真实样品的MCNP传感器阵列的影响。我们表明，只有经过湿度补偿后，一系列MCNP化学电阻器才能在2-83％相对湿度（RH）的可变背景下精确检测和估算挥发性有机化合物（VOC）的微妙浓度。在两项旨在通过呼气分析检测前列腺癌和乳腺癌的临床试验中，还对湿度影响进行了测试。结果分析表明，通过RH补偿可以改善癌症检测能力，尽管其效果不如RH补偿对合成样品的影响大。该结果归因于以下一种或多种作用：（i）呼吸样本中的RH变化小于合成样本中的RH变化; （ii）呼吸样本中的挥发性有机化合物成分比合成样本受到的控制较少; （iii）对小极性VOC和水的响应不一定会在呼吸样品中叠加。最终，此处呈现的结果将有助于开发一种经济高效的低功耗方法，以在诸如呼吸分析以及环境，安全和食品应用等实际应用中广泛检测VOC。

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