Room-temperature H2 gasochromic behavior of Pd-modified MoO3 nanowire labels

You, K. L.; Cao, Fan; Wu, Guitai; Zhao, Pengfei; Huang, Hao; Zhao, Wenzhu; Hu, Yongming; Gu, Haoshuang; Wang, John

doi:10.1016/j.matchemphys.2019.01.070

Cited by 23 publications

(8 citation statements)

References 45 publications

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“…Increasing the specific surface area of the active layer by adapting 2D transition metal and graphene was also reported to successfully enhance the selectivity. [34][35][36][37] However, to store and transfer the information, those optical changes need to be converted to an electrical signal. Thus, additional efforts to implement converting systems are required to utilize gasochromic sensors properly.…”

Section: Introductionmentioning

confidence: 99%

Multimodal Gas Sensor Detecting Hydroxyl Groups with Phase Transition Based on Eco‐Friendly Lead‐Free Metal Halides

Lee

Kim

et al. 2022

Adv Funct Materials

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An electrical and optical responsive chemical-semiconductor gas sensor is developed using Cu(I) halides with a phase transition mechanism. Cu(I) materials exhibit reversible phase transitions between the Cs 3 Cu 2 I 5 and CsCu 2 I 3 with different properties, owing to the formation/destruction of the Cs-I and Cu-Cu bonding when the hydroxyl groups are attached/detached. Among various toxic and atmospheric gases, a Cu(I)-based gas sensor has high selectivity in detecting the hydroxyl group, and the highest sensitivity to water. The reactivity is determined by the polarity, where water with the largest polarity has the strongest attraction for Cu + and I − ions, letting phase transition occur easily. The multimodal sensor red-shifts emission from 445 to 575 nm when it detects hydroxyl gas, and the moisture-sensitive sensor visually confirms response to breaths in less than 5 s and recovery in the air in less than 30 s. The gas sensor can operate at room temperature while applying a constant bias voltage of 1 V, and it also shows excellent sensitivity in a relative humidity range of 15-75%. Furthermore, the sensor maintained ≈90% of its initial responsivity over 1 year.

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Section: Introductionmentioning

confidence: 99%

Multimodal Gas Sensor Detecting Hydroxyl Groups with Phase Transition Based on Eco‐Friendly Lead‐Free Metal Halides

Lee

Kim

et al. 2022

Adv Funct Materials

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“…Pd can reversibly absorb H 2 under ambient conditions by forming a hydride phase, which leads to change in its electrical and optical properties. Several Pd-based H 2 sensing technologies have been reported, including metal oxide semiconductor (MOS) sensors, − optical sensors, − triboelectric sensors, , surface acoustic wave (SAW) sensors, , photovoltaic sensors, chemiresistive sensors, , and gasochromic sensors. − Among these, chemiresistive sensors have been widely studied due to their simple fabrication, low cost, and simple interpretable output . When H 2 comes in contact with Pd, it dissociates and diffuses into the Pd lattice to form α-PdH x ([H 2 ] < 0.17%) or β-PdH x ([H 2 ] > 0.58%) leading to a change in its resistance .…”

Section: Introductionmentioning

confidence: 99%

Reduced Graphene Oxide-Wrapped Palladium Nanowires Coated with a Layer of Zeolitic Imidazolate Framework-8 for Hydrogen Sensing

Kumar

Mohammadi

Zhao

et al. 2021

ACS Appl. Nano Mater.

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Rapid and sensitive H2 detection is important because of its low threshold for the formation of explosive mixtures in air (∼4%). Palladium’s unique interactions with H2 make it particularly useful in room-temperature H2 sensing, but the formation of water by reaction with O2 at the Pd surface can interfere with sensor response. Here, we report H2 sensors using networks of high aspect ratio and ultrathin reduced graphene oxide (rGO)-coated palladium nanowires (Pd NWs@rGO) with a coating of zeolite imidazole framework (ZIF-8) that serves as a nanofiltration layer. We first produced Pd NWs in high yield by a hydrothermal method, then sonicated them with GO and added a reducing agent to produce Pd NWs@rGO. Thin Pd NWs promote rapid response and high sensitivity, while rGO prevents the formation of additional conductive channels due to expansion of Pd NWs upon H2 exposure, ensuring monotonic sensor response. The coating of ZIF-8 reduces the transport of molecules like oxygen and nitrogen to the Pd NWs while allowing H2 to reach them and H2O to diffuse away from them. The optimized sensors showed a response (relative change in resistance) to 1% H2 in air of up to 2%, with a response time of 5 s and a lower limit of detection of 20 ppm. Relative to previously reported Pd-based H2 sensors with fast response, the Pd NWs@rGO@ZIF-8 nanocomposite-based device provides a low-cost, high-performance sensor solution for fuel-cell vehicles and similar applications that require both rapid and sensitive H2 detection.

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“…Gasochromic materials change their optical properties, such as reflectivity and transmittance, when exposed to gases. (62) WO 3 , (34,63) MoO 3 , (64,65) and vanadium oxides (66,67) are the main gasochromic materials, among which WO 3 has attracted the most attention. Because WO 3 is the most extensively investigated nanomaterial for gasochromic reactions, several models have been proposed to reveal its gasochromic mechanisms.…”

Section: Gasochromic Mechanismsmentioning

confidence: 99%

Gasochromic Hydrogen Sensors: Fundamentals, Recent Advances, and Perspectives

Liu¹,

Yang²,

Wang³

et al. 2023

Sensors and Materials

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Hydrogen (H 2 ) is recognized as a vital solution for constructing a sustainable energy society owing to its abundance, high efficiency, and lack of pollution. However, H 2 is the lightest gas on earth and can embrittle metals, leading to hydrogen leakage. Because hydrogen has a wide flammability range of 4-74 vol.% in air and low ignition energy, it is crucial to identify hydrogen leakages quickly and efficiently to ensure safety. Although various hydrogen sensors have been developed, gasochromic hydrogen sensors, which are based on color changes caused by gasochromic nanomaterials, show great potential for use in the future hydrogen-based world because they are inexpensive, change color very quickly, and work at room temperature. This technical paper focuses on gasochromic hydrogen sensors. First, gasochromic mechanisms based on WO 3 nanomaterials are introduced, and three aspects of state-of-the-art research, WO 3 nanomaterials with novel structures, noble metals to promote reactions, and flexible fabrication, are presented. Research on the former two aspects aims to develop high-performance gasochromic nanomaterials, and research on flexible fabrication, i.e., transforming nanomaterials into potential hydrogen sensors, is reviewed here for the first time. In addition, other non-WO 3based gasochromic systems are briefly reviewed. Finally, this technical paper provides a brief perspective for future research.

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Room-temperature H2 gasochromic behavior of Pd-modified MoO3 nanowire labels

Cited by 23 publications

References 45 publications

Multimodal Gas Sensor Detecting Hydroxyl Groups with Phase Transition Based on Eco‐Friendly Lead‐Free Metal Halides

Multimodal Gas Sensor Detecting Hydroxyl Groups with Phase Transition Based on Eco‐Friendly Lead‐Free Metal Halides

Reduced Graphene Oxide-Wrapped Palladium Nanowires Coated with a Layer of Zeolitic Imidazolate Framework-8 for Hydrogen Sensing

Gasochromic Hydrogen Sensors: Fundamentals, Recent Advances, and Perspectives

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