Hydrothermal Synthesis of Single‐Crystal Europium Tungstate Hydroxide Nanobelts for Enhanced Humidity Sensing

Abstract Humidity sensing is crucial for environmental monitoring and industrial processes; however, existing sensors often face challenges in sensitivity and response time. This study addresses these challenges by introducing a novel material, EuWO 4 (OH) nanobelts, synthesized through a hydrothermal method. These nanobelts exhibit exceptional sensing performance, with a response value of 2.3×10 3 at 85 % RH, a rapid response time of 6.3 s, and a recovery time of 0.6 s. Unlike traditional materials, EuWO 4 (OH) nanobelts offer superior stability and reproducibility, making them a promising candidate for advanced humidity sensors. The distinctive electronic properties and high crystallinity of EuWO 4 (OH) nanobelts contribute to their high sensitivity and rapid response, which sets them apart from existing sensors. This study not only elucidates the potential of EuWO 4 (OH) nanobelts for humidity sensing but also provides a new direction for the development of next‐generation humidity sensors.