Drera Giovanni, Freddi Sonia, Freddi Tiziano, De Poli Andrea, Pagliara Stefania, De Crescenzi Maurizio, Castrucci Paola, Sangaletti Luigi
I-Lamp and Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, via dei Musei 41, 25121 Brescia, Italy.
Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
Nanomaterials (Basel). 2020 Nov 21;10(11):2303. doi: 10.3390/nano10112303.
Photovoltaic (PV) cells based on single-walled carbon nanotube (SWCNT)/silicon (Si) and multiwalled carbon nanotube (MWCNT)/Si junctions were tested under exposure to NH in the 0-21 ppm concentration range. The PV cell parameters remarkably changed upon NH exposure, suggesting that these junctions, while being operated as PV cells, can react to changes in the environment, thereby acting as NH gas sensors. Indeed, by choosing the open-circuit voltage, V, parameter as read-out, it was found that these cells behaved as gas sensors, operating at room temperature with a response higher than chemiresistors developed on the same layers. The sensitivity was further increased when the whole current-voltage (I-V) curve was collected and the maximum power values were tracked upon NH exposure.
基于单壁碳纳米管（SWCNT）/硅（Si）和多壁碳纳米管（MWCNT）/Si结的光伏（PV）电池在0 - 21 ppm浓度范围内暴露于NH₃的条件下进行了测试。暴露于NH₃后，PV电池参数发生了显著变化，这表明这些结在作为PV电池运行时，能够对环境变化做出反应，从而起到NH₃气体传感器的作用。实际上，通过选择开路电压V作为读出参数，发现这些电池表现为气体传感器，在室温下运行，其响应高于在相同层上开发的化学电阻器。当收集整个电流 - 电压（I - V）曲线并在暴露于NH₃时跟踪最大功率值时，灵敏度进一步提高。
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