Tonezzer Matteo, Ueda Taro, Torai Soichiro, Fujita Koki, Shimizu Yasuhiro, Hyodo Takeo
Department of Chemical and Geological Sciences, University of Cagliari, 09042 Monserrato, Italy.
Graduate School of Integrated Science and Technology, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
Nanomaterials (Basel). 2024 Dec 22;14(24):2052. doi: 10.3390/nano14242052.
The electronic nose is an increasingly useful tool in many fields and applications. Our thermal electronic nose approach, based on nanostructured metal oxide chemiresistors in a thermal gradient, has the advantage of being tiny and therefore integrable in portable and wearable devices. Obviously, a wise choice of the nanomaterial is crucial for the device's performance and should therefore be carefully considered. Here we show how the addition of different amounts of Au (between 1 and 5 wt%) on CuO-SnO nanospheres affects the thermal electronic nose performance. Interestingly, the best performance is not achieved with the material offering the highest intrinsic selectivity. This confirms the importance of specific studies, since the performance of chemoresistive gas sensors does not linearly affect the performance of the electronic nose. By optimizing the amount of Au, the device achieved a perfect classification of the tested gases (acetone, ethanol, and toluene) and a good concentration estimation (with a mean absolute percentage error around 16%). These performances, combined with potentially smaller dimensions of less than 0.5 mm, make this thermal electronic nose an ideal candidate for numerous applications, such as in the agri-food, environmental, and biomedical sectors.
电子鼻在许多领域和应用中日益成为一种有用的工具。我们基于处于热梯度中的纳米结构金属氧化物化学电阻器的热电子鼻方法，具有体积微小的优势，因此可集成到便携式和可穿戴设备中。显然，明智地选择纳米材料对设备性能至关重要，因此应仔细考虑。在此，我们展示了在CuO - SnO纳米球上添加不同量的Au（1至5 wt%）如何影响热电子鼻的性能。有趣的是，具有最高固有选择性的材料并未实现最佳性能。这证实了具体研究的重要性，因为化学电阻式气体传感器的性能并非线性地影响电子鼻的性能。通过优化Au的量，该设备实现了对测试气体（丙酮、乙醇和甲苯）的完美分类以及良好的浓度估计（平均绝对百分比误差约为16%）。这些性能，再加上潜在的小于0.5毫米的更小尺寸，使这种热电子鼻成为众多应用（如农业食品、环境和生物医学领域）的理想候选者。
