Hydrogen Sensors from Composites of Ultra-small Bimetallic Nanoparticles and Porous Ion-Exchange Polymers

Koo, Won‐Tae; Kim, Yoonseob; Kim, Sunwoo; Suh, Bong Lim; Savagatrup, Suchol; Kim, Jihan; Lee, Sung-Ju; Swager, Timothy M.; Kim, Il‐Doo

doi:10.1016/j.chempr.2020.07.015

Cited by 33 publications

(20 citation statements)

References 58 publications

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“…As demonstrated in Figure S7, the Pd/SnO 2 /AAO based gas sensor shows dramatic enhancement (∼62.7 times) of response (144.2@1000 ppm) compared with that of the pristine SnO 2 ones (2.3@1000 ppm). Such a substantial sensing response enhancement can be ascribed to the catalytic effect at the Pd–SnO 2 interface which can be explained by the chemical and electronic sensitization promoted by the Pd nanoparticles decoration. , In this chemical sensitization process, oxygen molecules can easily adsorb on the Pd/SnO 2 surface, and then they are converted to active ionic species (O 2 – , O – , and O 2– ) by capturing electrons from the SnO 2 surface, producing the surface electron depletion region, and resulting in the high resistance baseline in air . When exposed to the H 2 atmosphere, the H 2 dissociation (H 2 → 2H) will be catalyzed on the Pd nanoparticle surface and the dissociated H atoms migrate to the Pd–SnO 2 interface via a spillover effect, , reducing the preadsorbed oxygen ions.…”

Section: Resultsmentioning

confidence: 99%

Wireless Self-Powered High-Performance Integrated Nanostructured-Gas-Sensor Network for Future Smart Homes

et al. 2021

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The accelerated evolution of communication platforms including Internet of Things (IoT) and the fifth generation (5G) wireless communication network makes it possible to build intelligent gas sensor networks for real-time monitoring chemical safety and personal health. However, this application scenario requires a challenging combination of characteristics of gas sensors including small formfactor, low cost, ultralow power consumption, superior sensitivity, and high intelligence. Herein, self-powered integrated nanostructured-gas-sensor (SINGOR) systems and a wirelessly connected SINGOR network are demonstrated here. The room-temperature operated SINGOR system can be self-driven by indoor light with a Si solar cell, and it features ultrahigh sensitivity to H2, formaldehyde, toluene, and acetone with the record low limits of detection (LOD) of 10, 2, 1, and 1 ppb, respectively. Each SINGOR consisting of an array of nanostructured sensors has the capability of gas pattern recognition and classification. Furthermore, multiple SINGOR systems are wirelessly connected as a sensor network, which has successfully demonstrated flammable gas leakage detection and alarm function. They can also achieve gas leakage localization with satisfactory precision when deployed in one single room. These successes promote the development of using nanostructured-gas-sensor network for wide range applications including smart home/building and future smart city.

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Section: Resultsmentioning

confidence: 99%

Wireless Self-Powered High-Performance Integrated Nanostructured-Gas-Sensor Network for Future Smart Homes

et al. 2021

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“…So far, there have been huge efforts to develop efficient H 2 sensors using metal-based materials. Table summarizes the recent and representative metal-based H 2 sensors, particularly operated at RT in air. − ,,,,,,,− The sensors exhibited high H 2 sensing performances, in terms of detection range, response, and sensing speed. However, despite these significant advances in metal-based nanomaterials for H 2 sensors, there still remain several unresolved challenges.…”

Section: Metal-based Materialsmentioning

confidence: 99%

Chemiresistive Hydrogen Sensors: Fundamentals, Recent Advances, and Challenges

et al. 2020

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Hydrogen (H 2 ) is one of the next-generation energy sources because it is abundant in nature and has a high combustion efficiency that produces environmentally benign products (H 2 O). However, H 2 /air mixtures are explosive at H 2 concentrations above 4%, thus any leakage of H 2 must be rapidly and reliably detected at much lower concentrations to ensure safety. Among the various types of H 2 sensors, chemiresistive sensors are one of the most promising sensing systems due to their simplicity and low cost. This review highlights the advances in H 2 chemiresistors, including metal-, semiconducting metal oxide-, carbon-based materials, and other materials. The underlying sensing mechanisms for different types of materials are discussed, and the correlation of sensing performances with nanostructures, surface chemistry, and electronic properties is presented. In addition, the discussion of each material emphasizes key advances and strategies to develop superior H 2 sensors. Furthermore, recent key advances in other types of H 2 sensors are briefly discussed. Finally, the review concludes with a brief outlook, perspective, and future directions.

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“…For instance, as shown in Table , all sensors exhibit detection limits well below the target of 0.1 vol %. As state-of-the-art, detection limits down to single-digit ppm, or even ppb, have been demonstrated. ,,,,, These sensors are also capable of detecting hydrogen concentrations up to 4 vol %, although the response is usually not linear across this range of concentrations and rarely measured for both increasing and decreasing concentration. The former limits the concentration range across which the sensors exhibit high sensitivity (i.e., a significant change in sensor readout per H 2 concentration change), while the latter creates history-dependent sensor readout (i.e., hysteresis) and thus reduces accuracy within a certain pressure range.…”

Section: Hydrogen Sensor State-of-the-art With Respect To the Us Doe ...mentioning

confidence: 99%

High-Performance Nanostructured Palladium-Based Hydrogen Sensors—Current Limitations and Strategies for Their Mitigation

Nugroho²,

2020

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Hydrogen gas is rapidly approaching a global breakthrough as a carbon-free energy vector. In such a hydrogen economy, safety sensors for hydrogen leak detection will be an indispensable element along the entire value chain, from the site of hydrogen production to the point of consumption, due to the high flammability of hydrogen–air mixtures. To stimulate and guide the development of such sensors, industrial and governmental stakeholders have defined sets of strict performance targets, which are yet to be entirely fulfilled. In this Perspective, we summarize recent efforts and discuss research strategies for the development of hydrogen sensors that aim at meeting the set performance goals. In the first part, we describe the state-of-the-art for fast and selective hydrogen sensors at the research level, and we identify nanostructured Pd transducer materials as the common denominator in the best performing solutions. As a consequence, in the second part, we introduce the fundamentals of the Pd–hydrogen interaction to lay the foundation for a detailed discussion of key strategies and Pd-based material design rules necessary for the development of next generation high-performance nanostructured Pd-based hydrogen sensors that are on par with even the most stringent and challenging performance targets.

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Hydrogen Sensors from Composites of Ultra-small Bimetallic Nanoparticles and Porous Ion-Exchange Polymers

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Cited by 33 publications

References 58 publications

Wireless Self-Powered High-Performance Integrated Nanostructured-Gas-Sensor Network for Future Smart Homes

Wireless Self-Powered High-Performance Integrated Nanostructured-Gas-Sensor Network for Future Smart Homes

Chemiresistive Hydrogen Sensors: Fundamentals, Recent Advances, and Challenges

High-Performance Nanostructured Palladium-Based Hydrogen Sensors—Current Limitations and Strategies for Their Mitigation

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