Astolfi Michele, Zonta Giulia, Gherardi Sandro, Malagù Cesare, Vincenzi Donato, Rispoli Giorgio
Department of Physics and Earth Science, University of Ferrara, 44122 Ferrara, Italy.
SCENT S.r.l., 44124 Ferrara, Italy.
Nanomaterials (Basel). 2023 Sep 12;13(18):2549. doi: 10.3390/nano13182549.
Chemoresistive nanostructured gas sensors are employed in many diverse applications in the medical, industrial, environmental, etc. fields; therefore, it is crucial to have a device that is able to quickly calibrate and characterize them. To this aim, a portable, user-friendly device designed to easily calibrate a sensor in laboratory and/or on field is introduced here. The device comprises a small hermetically sealed chamber (containing the sensor socket and a temperature/humidity sensor), a pneumatic system, and a custom electronics controlled by a Raspberry Pi 4 developing board, running a custom software (Version 1.0) whose user interface is accessed via a multitouch-screen. This device automatically characterizes the sensor heater in order to precisely set the desired working temperature, it acquires and plots the sensor current-to-voltage and Arrhenius relationships on the touch screen, and it can record the sensor responses to different gases and environments. These tests were performed in dry air on two representative sensors based on widely used SnO material. The device demonstrated the independence of the Arrhenius plot from the film applied voltage and the linearity of the I-Vs, which resulted from the voltage step length (1-30 min) and temperature (200-550 °C).
化学电阻纳米结构气体传感器在医学、工业、环境等众多领域有着广泛应用；因此，拥有一种能够快速校准和表征这些传感器的设备至关重要。为此，本文介绍了一种便携式、用户友好型设备，旨在便于在实验室和/或现场校准传感器。该设备包括一个小型密封腔室（包含传感器插座和温度/湿度传感器）、一个气动系统以及由树莓派4开发板控制的定制电子设备，运行定制软件（版本1.0），其用户界面可通过多点触摸屏访问。该设备自动表征传感器加热器，以便精确设定所需工作温度，它在触摸屏上采集并绘制传感器电流与电压以及阿仑尼乌斯关系曲线，并且能够记录传感器对不同气体和环境的响应。这些测试是在干燥空气中基于广泛使用的SnO材料对两个代表性传感器进行的。该设备证明了阿仑尼乌斯曲线与施加薄膜电压无关，以及电流-电压曲线的线性，这是由电压步长（1 - 30分钟）和温度（200 - 550°C）导致的。
