研究目的
To develop a highly stable and ultrafast hydrogen gas sensor based on palladium-gold nanoribbons with uniform nanogaps to overcome limitations of existing Pd sensors at low H2 concentrations and phase transition issues.
研究成果
The Pd0.6Au0.4 NRB sensor with 15 nm nanogaps achieves ultrafast, linear, and stable H2 sensing across a full range of concentrations (0.005%-10%) with a low LOD of 0.0027% and high detection linearity. It maintains performance after long-term storage and under humidity, paving the way for practical H2 sensor applications in hydrogen energy systems.
研究不足
The study focuses on PdAu alloy sensors; performance at Au proportions exceeding 0.5 was not effective. Long-term stability beyond seven months and extreme environmental conditions beyond tested humidity levels were not fully explored. Fabrication process requires precise control of temperature and pressure, which may limit scalability.
1：Experimental Design and Method Selection:
Utilized a direct metal transfer (DMT) process with polystyrene (PS) substrate shrinkage to fabricate PdAu nanoribbon arrays with uniform nanogaps. Theoretical models included density functional theory (DFT) calculations for adsorption energy and lattice changes.
2：Sample Selection and Data Sources:
Fabricated PdAu NRB sensors with varying nanogap widths (e.g., 15 nm) and alloy compositions (e.g., Pd
3：6Au4). H2 gas concentrations ranged from 005% to 10% in controlled environments. List of Experimental Equipment and Materials:
Equipment included electron beam evaporator for metal deposition, SEM (JEOL-JSM 7500F) for morphology analysis, XRD (Bruker AXS D8) for crystallinity, XPS (ESCALAB 250Xi-Thermo Fisher Scientific) for chemical analysis, and Keithley-2400S source meter for electrical measurements. Materials included Pd, Au, PS substrate, Si stamp, CF3(CF2)5(CH2)2SiCl3 SAM, and H2 gas.
4：Experimental Procedures and Operational Workflow:
Steps involved SAM formation on Si stamp, Pd and Au deposition, transfer to PS substrate under hydraulic pressure and thermal treatment, detachment at specific temperatures to control nanogap width, and electrode deposition. H2 sensing measurements were conducted at room temperature with controlled gas flow.
5：Data Analysis Methods:
Gas-sensing response (GR) calculated as (RS - R0)/R0 * 100, response and recovery times defined, LOD calculated using ICH model, and DFT simulations for adsorption energy and lattice constant changes.
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