CBD-grown Pd/MoO3 nanogranule films on tapered optical fibers for enhanced optical hydrogen sensing

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-09-22 DOI:10.1016/j.sna.2025.117080

Nor Akmar Mohd Yahya , Mohd Rashid Yusof Hamid , Nurul Hida Zainuddin , Boon Hoong Ong , Mohd Adzir Mahdi , Mohd Hanif Yaacob

{"title":"CBD-grown Pd/MoO3 nanogranule films on tapered optical fibers for enhanced optical hydrogen sensing","authors":"Nor Akmar Mohd Yahya , Mohd Rashid Yusof Hamid , Nurul Hida Zainuddin , Boon Hoong Ong , Mohd Adzir Mahdi , Mohd Hanif Yaacob","doi":"10.1016/j.sna.2025.117080","DOIUrl":null,"url":null,"abstract":"<div><div>This study presents exciting molybdenum trioxide (MoO3) nanostructure coated on tapered optical fiber via chemical bath deposition (CBD) for hydrogen (H2) gas sensing. The morphology and material properties of the samples were characterized using FESEM, EDX, Raman spectroscopy, and XRD. It has been found that the formations of nanogranules on as-prepared MoO3 samples were growing uniformly along the tapered region with sizes approximately ranging from 100 to 300 nm. The detection of H2 gas was measured in the visible to near infra-red optical wavelength. The developed sensor is discovered to have maximum absorbance response at 150 °C of optimum operating temperature with a palladium (Pd) catalyst. The sensor is sensitive towards different concentrations as the absorbance has increased proportionally from 0.125 % to 1.0 % of H2. The different growths of thickness were obtained by varying the deposition time of the MoO3 coating. Optimized deposition time was observed at 10 min with 250 nm thickness on the point of maximum absorbance response achieved. Next, the study on comparison between as-prepared and annealed Pd/MoO3 sensors shows that the annealed ones have shown better performance with a sensitivity of 3.579/vol%. The absorbance response of annealed Pd/MoO3 has increased about 70 % compared to as-prepared Pd/MoO3, enabling high sensitivity, fast response/recovery, and excellent selectivity offering a promising pathway for reliable H2 leak detection and safety monitoring.</div></div>","PeriodicalId":21689,"journal":{"name":"Sensors and Actuators A-physical","volume":"395 ","pages":"Article 117080"},"PeriodicalIF":4.9000,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Sensors and Actuators A-physical","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0924424725008866","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}

引用次数: 0

Abstract

This study presents exciting molybdenum trioxide (MoO₃) nanostructure coated on tapered optical fiber via chemical bath deposition (CBD) for hydrogen (H₂) gas sensing. The morphology and material properties of the samples were characterized using FESEM, EDX, Raman spectroscopy, and XRD. It has been found that the formations of nanogranules on as-prepared MoO₃ samples were growing uniformly along the tapered region with sizes approximately ranging from 100 to 300 nm. The detection of H₂ gas was measured in the visible to near infra-red optical wavelength. The developed sensor is discovered to have maximum absorbance response at 150 °C of optimum operating temperature with a palladium (Pd) catalyst. The sensor is sensitive towards different concentrations as the absorbance has increased proportionally from 0.125 % to 1.0 % of H₂. The different growths of thickness were obtained by varying the deposition time of the MoO₃ coating. Optimized deposition time was observed at 10 min with 250 nm thickness on the point of maximum absorbance response achieved. Next, the study on comparison between as-prepared and annealed Pd/MoO₃ sensors shows that the annealed ones have shown better performance with a sensitivity of 3.579/vol%. The absorbance response of annealed Pd/MoO₃ has increased about 70 % compared to as-prepared Pd/MoO₃, enabling high sensitivity, fast response/recovery, and excellent selectivity offering a promising pathway for reliable H₂ leak detection and safety monitoring.

查看原文本刊更多论文

锥形光纤上cbd生长的Pd/MoO3纳米颗粒膜增强了光学氢传感

采用化学浴沉积（CBD）技术在锥形光纤表面制备了三氧化钼（MoO3）纳米结构，用于氢（H2）气敏。采用FESEM、EDX、拉曼光谱和XRD对样品的形貌和材料性能进行了表征。结果表明，在制备的MoO3样品上，纳米颗粒沿锥形区均匀生长，粒径约为100 ~ 300 nm。在可见光至近红外波段对H2气体进行检测。该传感器在钯（Pd）催化剂的最佳工作温度为150°C时具有最大的吸光度响应。H2的吸光度从0.125 %成比例增加到1.0 %，传感器对不同浓度的H2都很敏感。MoO3涂层的厚度随沉积时间的变化而变化。最佳沉积时间为10 min，吸光度最大的点厚度为250 nm。其次，将制备的Pd/MoO3传感器与退火后的Pd/MoO3传感器进行对比研究，退火后的Pd/MoO3传感器具有更好的性能，灵敏度为3.579/vol%。与制备的Pd/MoO3相比，退火Pd/MoO3的吸光度响应提高了约70 %，具有高灵敏度、快速响应/恢复和优异的选择性，为可靠的H2泄漏检测和安全监测提供了有希望的途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...