Thin palladium nanograins film for efficient and selective hydrogen sensor

IF 2 4区材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS

Thin Solid Films Pub Date : 2025-08-26 DOI:10.1016/j.tsf.2025.140778

Joanna Rymarczyk, Izabela Stępińska, Mirosław Kozłowski

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Abstract

The development of reliable hydrogen sensors is pivotal for safety in hydrogen technologies. This paper presents the palladium material's ability for hydrogen sensing applications. The thin palladium nanograins films (Pd film) composed of nanograins show highly selective properties towards hydrogen. The films were obtained by palladium acetate evaporation via the Physical Vapor Deposition method. Scanning electron microscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) were employed for studying the topography and morphology of films. The FTIR spectra demonstrated a total decomposition of Pd acetate during the deposition process while the TEM results received at high resolution mode confirmed that fine Pd nanograins with face-centred cubic (fcc) crystal structure were created. The sensing properties have been studied for different hydrogen concentrations from 50 ppm to 20,000 ppm in ambient conditions. The Pd nanograin films exhibited high sensitivity to hydrogen at concentrations as low as 0.005% and excellent selectivity against methane and ammonia. During the measurements, a decrease in the electrical resistance of films was observed. The formation of PdH_x was responsible for this phenomenon and it was proved by the in-situ XRD studies. These findings suggest that Pd nanograin films are promising for hydrogen sensor technology.

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用于高效、选择性氢传感器的钯纳米颗粒薄膜

开发可靠的氢传感器对氢技术的安全性至关重要。本文介绍了钯材料的氢传感应用能力。由纳米颗粒组成的钯纳米薄膜（Pd膜）对氢具有高度的选择性。采用物理气相沉积法对醋酸钯进行蒸发制备薄膜。采用扫描电镜（sem）、透射电镜（TEM）、x射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对薄膜的形貌和形貌进行了研究。FTIR光谱显示沉积过程中醋酸钯发生了完全分解，高分辨率透射电镜结果证实沉积过程中形成了具有面心立方（fcc）晶体结构的纳米钯颗粒。在环境条件下，研究了不同氢浓度从50 ppm到20,000 ppm的传感性能。钯纳米颗粒膜对浓度低至0.005%的氢具有很高的敏感性，对甲烷和氨具有良好的选择性。在测量过程中，观察到薄膜的电阻下降。PdHx的形成是导致这种现象的原因，并通过原位XRD研究证实了这一点。这些发现表明，钯纳米颗粒薄膜在氢传感器技术中具有广阔的应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin Solid Films 工程技术-材料科学：膜

CiteScore

4.00

自引率

4.80%

发文量

381

审稿时长

7.5 months

期刊介绍： Thin Solid Films is an international journal which serves scientists and engineers working in the fields of thin-film synthesis, characterization, and applications. The field of thin films, which can be defined as the confluence of materials science, surface science, and applied physics, has become an identifiable unified discipline of scientific endeavor.