发表机构
Luxembourg Institute of Science and Technology（卢森堡科学与技术研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过超声团簇束沉积制备钯膜，发现逾渗阈值在1.5-2.5 nm之间，并利用氢致结构变化实现快速选择性氢检测，同时探索聚合物植入增强量子隧穿，为小型化多模态传感提供新途径。
AI 中文摘要
通过超声团簇束沉积法，在生长过程中原位研究了团簇组装纳米颗粒钯膜的电输运特性。逾渗起始于1.5 nm厚度处，逾渗完成于2.5 nm厚度处。随后，将处于逾渗厚度（2 nm）及逾渗结束之后（5 nm）的薄膜在外部环境中暴露于0.25%的氢气（空气中），以研究氢诱导的Pd团簇结构变化如何调节电输运，并可作为选择性氢检测的机制。还探索了将钯团簇植入软聚合物苯乙烯-乙烯-丁烯-苯乙烯中，以促进团簇分离并增强电输运中的量子隧穿现象。观察到的电输运模式在空气中具有稳定的基线，表明材料稳定性好，响应时间快（T50% < 10 s），且氢暴露引起的电导变化中可逆与不可逆成分共存。不可逆成分初步归因于氢促进的Pd团簇部分合并。聚合物植入样品的行为表明存在另一种气体检测机制，其中氢诱导的聚合物膨胀主导了钯结构修饰。这些结果揭示了用于小型化氢检测和多模态传感的新型潜在转导途径。
英文摘要
Electrical transport in cluster-assembled nanogranular palladium films was investigated in-situ during growth by Supersonic Cluster Beam Deposition. The percolation onset is observed at a thickness of 1.5 nm, while the percolation completion at 2.5 nm. Films at the percolation thickness (2 nm) and beyond the percolation end (5 nm) were subsequently exposed ex-situ to 0.25% hydrogen in air to investigate how hydrogen-induced structural changes in Pd clusters modulate electrical transport and can be exploited as mechanism for selective hydrogen detection. Implantation of palladium clusters in soft polymer styrene-ethylene-butylene-styrene was also explored to promote clusters separation and enhance quantum tunnelling phenomena within electrical transport. The observed electrical transport pattern features stable baselines in air, suggesting material stability, fast response time (T50% < 10 s), and the coexistence of reversible and irreversible components in conduction changes induced by hydrogen exposure. The irreversible component is tentatively attributed to hydrogen-promoted partial coalescence of Pd clusters. The behaviour of the polymer implanted samples suggests an alternative gas detection mechanism where hydrogen-induced polymer swelling dominates over palladium structural modifications. These results disclose novel possible transducing routes for miniaturized hydrogen detection and multimodal sensing.
