基于CsPbBr3量子点的湿度传感器的制备及其在微裂纹检测中的应用

采用简单的溶液路线结合乙酰丙酮铁(AAI)改性技术，制备了分散性良好、尺寸均匀的钙钛矿型CsPbBr₃-Fe量子点(QDs)，通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及光致发光(PL)光谱对材料进行表征。并通过旋涂法构筑基于钙钛矿QDs的电阻式湿度传感器。湿敏特性测量结果表明：该湿度传感器在10%~100%的相对湿度(RH)的检测范围内具有良好的线性、快速响应特性；在70% RH时传感器的灵敏度为1.1，响应时间为33 s，恢复时间为38 s。此外，我们运用有限元方法模拟了管道微裂缝的泄漏行为，通过模拟不同流速、压力下的流速场和压力场分布，验证了利用湿度传感器检测泄漏点位置的可行性。

Preparation of humidity sensors based on CsPbBr3 quantum dots for applications in microcrack detection

Perovskite CsPbBr₃-Fe quantum dots (QDs) with good dispersion and uniform size were prepared using a simple solution route combined with an acetylacetone iron (AAI) modification technology. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and photoluminescence (PL) spectroscopy. Then, a resistive humidity sensor was fabricated with the perovskite CsPbBr 3-Fe QDs by a spin-coating method. The humidity sensitivity measurement results showed that the device had good linear and rapid response characteristics with a detection range of 10% to 100% relative humidity (RH). At 70% RH, the humid sensor displayed a sensitivity of 1.1, a response time of 38 s, and a recovery time of 38 s, respectively. In addition, we used the finite element method (FEM) to simulate the leakage behavior of pipeline microcracks, and verified the feasibility of using humidity sensors to detect the leakage locations by simulating the distribution of flow velocity and pressure fields under different flow velocities and pressures.