The increasing morbidity of internal diseases poses serious threats to human health and quality of life. Exhaled breath analysis is a noninvasive and convenient diagnostic method to improve the cure rate of patients. In this study, a self-powered breath analyzer based on polyaniline/polyvinylidene fluoride (PANI/PVDF) piezo-gas-sensing arrays has been developed for potential detection of several internal diseases. The device works by converting exhaled breath energy into piezoelectric gas-sensing signals without any external power sources. The five sensing units in the device have different sensitivities to various gas markers with concentrations ranging from 0 to 600 ppm. The working principle can be attributed to the coupling of the in-pipe gas-flow-induced piezoelectric effect of PVDF and gas-sensing properties of PANI electrodes. In addition, the device demonstrates its use as an ethanol analyzer to roughly mimic fatty liver diagnosis. This new approach can be applied to fabricating new exhaled breath analyzers and promoting the development of self-powered systems.

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内部疾病的发病率不断提高，对人类健康和生活质量构成了严重威胁。呼气分析是一种无创且方便的诊断方法，可以提高患者的治愈率。在这项研究中，已经开发了一种基于聚苯胺/聚偏二氟乙烯（PANI / PVDF）压电气体传感阵列的自供电式呼吸分析仪，可用于多种内部疾病的潜在检测。该设备通过将呼出的呼吸能转换为压电气体感应信号而无需任何外部电源来工作。设备中的五个传感单元对各种气体标记物的灵敏度不同，浓度范围为0至600 ppm。工作原理可归因于管道内气流诱导的PVDF压电效应与PANI电极的气敏特性的耦合。此外，该设备展示了其作为乙醇分析仪的用途，可大致模拟脂肪肝的诊断。这种新方法可用于制造新的呼气分析仪并促进自供电系统的发展。

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