The development of high-performance hydrogen sensors is considered of great significance for the safety of hydrogen energy and related industries. The two-dimensional (2D) MoS₂ nanomaterials have exhibited great superiority in building fast and reliable room-temperature hydrogen sensors. However, their poor sensitivity and selectivity issues still limit their wide exploitation. In this work, nano-SnO₂-modified MoS₂ thin films with structure-dependent n-p tunable hydrogen response behaviours were reported. The in-situ scanning Kelvin probe microscopy (SKPM) study on the hydrogen response of the SnO₂/MoS₂ systems revealed the different reductions in the surface potential of SnO₂ (0.38 eV) and MoS₂ (0.26 eV) in a hydrogen environment, which results in different variations in the interface potential barrier with the increasing surface coverage of SnO₂. As a result, the contribution from the interface effect to the n-type hydrogen response was changed from the positive enhancement to the negative compensation. The sensor exhibited a fast, enhanced, and selective n-type hydrogen response with the SnO₂ coverage down to 6.4%, while a p-type sensor response was achieved when the SnO₂ coverage increased to 95.6%. Such structure-dependent n-p tunable hydrogen sensing behaviour can not only be utilized for the sensitization of the sensing layers but may also provide a simple and cost-effective way for the modulation of the response type of the sensor composed of the MoS₂-based 2D materials.

高性能氢传感器的开发对于氢能源及相关产业的安全具有重要意义。二维（2D）MoS ₂纳米材料在构建快速可靠的室温氢传感器方面表现出巨大的优越性。然而，它们较差的灵敏度和选择性问题仍然限制了它们的广泛利用。在这项工作中，报道了具有结构依赖性np可调氢响应行为的纳米SnO ₂改性MoS ₂薄膜。_{对 SnO 2} /MoS _{2系统氢响应的}原位扫描开尔文探针显微镜 (SKPM) 研究揭示了在氢环境中SnO ₂ (0.38 eV) 和 MoS ₂ (0.26 eV)表面电势的不同降低，这导致界面势垒随着SnO ₂表面覆盖率的增加而不同变化。结果，界面效应对n型氢响应的贡献从正增强变为负补偿。该传感器表现出快速、增强和选择性的n型氢响应，SnO _{2覆盖率低至6.4%，而当SnO 2}覆盖率增加至95.6%时，实现了p型传感器响应。_{这种依赖于结构的np可调氢传感行为不仅可以用于传感层的敏化，而且还可以为调节由MoS 2}基2D组成的传感器的响应类型提供简单且经济有效的方式材料。