Pristine and Pd-decorated two-dimensional (2D) ZnO nanosheets were used for hydrogen detection. The 2D ZnO nanosheets were prepared through a facile hydrothermal method, and Pd-decoration was carried out using UV irradiation. Formation of ZnO nanosheets with the desired morphology, chemical composition, and crystallinity was demonstrated through different characterization techniques. In particular, the thickness of each ZnO nanosheet was approximately 1 nm, corresponding to a few atomic layers. Sensing studies on hydrogen gas revealed the positive effects of Pd-decoration on response, sensing temperature, and selectivity. The Pd-decorated nanosheet sensor successfully sensed the low concentrations of hydrogen gas. Moreover, the gas sensor was able to detect hydrogen in a gaseous mixture with benzene. Moreover, a mixture of H₂ and interfering gas exhibited a noticeable detection, exhibiting higher and lower responses than pure interfering gas and pure H₂ gas, respectively. Gas sensing experiments in self-heating mode were conducted and showed that the optimal voltage for self-heating operation decreased from 20 to 5 V after Pd-decoration. At a low temperature, Pd-decorated ultrathin ZnO nanosheets showed the p-type sensing, presumably from the combined effects of enhanced oxygen adsorption and ZnO-to-Pd electron transfer. In addition, we examined the flexibility by means of bending, tilting, and stretching tests. Sensing enhancement of the Pd-decorated sensor originates from the presence of Pd–ZnO heterojunctions, formation of PdH_x, and the high catalytic activity of Pd.

原始和Pd装饰的二维（2D）ZnO纳米片用于氢气检测。通过简便的水热法制备2D ZnO纳米片，并使用UV辐射进行Pd修饰。通过不同的表征技术证明了具有所需形态，化学组成和结晶度的ZnO纳米片的形成。特别地，每个ZnO纳米片的厚度约为1nm，对应于几个原子层。对氢气的传感研究表明，Pd修饰对响应，传感温度和选择性具有积极作用。装饰钯的纳米片传感器成功地检测到低浓度的氢气。此外，气体传感器能够检测与苯的气态混合物中的氢。而且，H的混合物_图2和干扰气体显示出明显的检测结果，分别比纯干扰气体和纯H ₂气体显示更高和更低的响应。进行了自热模式的气敏实验，结果表明，经过Pd装饰后，自热运行的最佳电压从20 V降低到5V。在低温下，Pd装饰的超薄ZnO纳米片表现出p型感测，大概是由于增强的氧吸附和ZnO到Pd电子转移的综合作用所致。此外，我们通过弯曲，倾斜和拉伸测试检查了柔韧性。Pd装饰的传感器的感应增强源自Pd-ZnO异质结的存在，PdH _x的形成以及Pd的高催化活性。