Highly sensitive and wrappable room temperature wireless gasochromic and chemiresistive dual-response H2 sensors using spray coating

Girma, Henok Getachew; Lee, Hye Min; Kim, Yejin; Ryu, Gi-Seong; Jeon, Seungju; Kim, Jin Young; Jung, Seo‐Hyun; Kim, Se Hyun; Noh, Yong‐Young; Lim, Bogyu

doi:10.1016/j.nanoen.2023.108551

Cited by 6 publications

(9 citation statements)

References 37 publications

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“…Our results can also be the basis for the development of novel gas sensors with enhanced target gas selectivity based on a fundamental mechanistic understanding. Combining electrical and optical sensor response of one sensor material can lead to an enhanced degree of information because target gases other than ethanol (e.g., CO and H 2 ) may lead to varying ratios of the electrical and optical sensor responses resulting from their specific surface adsorbates and reduction potential, thus influencing the electrical and optical sensor responses to different degrees …”

Section: Discussionmentioning

confidence: 99%

Unraveling Mechanistic Differences in Optical and Electrical Sensors: Time-Resolved Operando UV–Vis Spectroscopy of p-Type Perovskite Gas Sensors

Pfeiffer,

Hess

2023

J. Phys. Chem. C

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To gain a deeper understanding of p-type chemiresistive and gasochromic sensor materials, LaFeO3 and SmFeO3 were investigated by using time-resolved operando UV–vis spectroscopy. A qualitative match in the electrical conductance and optical absorbance below the band edge was observed. The two properties are connected by changes in the electron hole concentration caused by the sensor surface reaction with ethanol, leading to a decrease in both conductance and free carrier absorption. Quantitative differences between the conductance and free carrier absorption behavior are explained based on surface effects caused by the surface band bending and surface adsorbates, which lead to significant changes in conductance but are only of minor importance for changes in the free carrier absorption. Our results demonstrate the potential of time-resolved operando UV–vis spectroscopy to develop a detailed mechanistic understanding of chemiresistive and gasochromic sensors by discriminating between surface and bulk effects and to combine their use for future gas sensor development.

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Section: Discussionmentioning

confidence: 99%

Unraveling Mechanistic Differences in Optical and Electrical Sensors: Time-Resolved Operando UV–Vis Spectroscopy of p-Type Perovskite Gas Sensors

Pfeiffer,

Hess

2023

J. Phys. Chem. C

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“…Efforts to lower MOS operating temperatures without sacrificing sensitivity have focused on increasing surface-to-volume ratios. MOS microcubes, thin films and nanostructures such as nanoparticles, , nanospheres, , nanorods, nanowires, nanotubes, nanofilms, and nanoflowers, − all exhibit improved sensitivity at lower temperature. In addition, functionalizing the MOS surface with metals like Pd, Pt, or Ni nanoparticles greatly improves H 2 sensitivity.…”

Section: Metal Oxide Semiconductor Sensorsmentioning

confidence: 99%

Critical Sensing Modalities for Hydrogen: Technical Needs and Status of the Field to Support a Changing Energy Landscape

Swager,

Pioch,

Feng

et al. 2024

ACS Sens.

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Decarbonization of the energy system is a key aspect of the energy transition. Energy storage in the form of chemical bonds has long been viewed as an optimal scheme for energy conversion. With advances in systems engineering, hydrogen has the potential to become a low cost, low emission, energy carrier. However, hydrogen is difficult to contain, it exhibits a low flammability limit (>40000 ppm or 4%), low ignition energy (0.02 mJ), and it is a short-lived climate forcer. Beyond commercially available sensors to ensure safety through spot checks in enclosed environments, new sensors are necessary to support the development of low emission infrastructure for production, transmission, storage, and end use. Efficient scalable broad area hydrogen monitoring motivates lowering the detection limit below that (10 ppm) of best in class commercial technologies. In this perspective, we evaluate recent advances in hydrogen gas sensing to highlight technologies that may find broad utility in the hydrogen sector. It is clear in the near term that a sensor technology suite is required to meet the variable constraints (e.g., power, size/weight, connectivity, cost) that characterize the breadth of the application space, ranging from industrial complexes to remote pipelines. This perspective is not intended to be another standard hydrogen sensor review, but rather provide a critical evaluation of technologies with detection limits preferably below 1 ppm and low power requirements. Given projections for rapid market growth, promising techniques will also be amenable to rapid development in technical readiness for commercial deployment. As such, methods that do not meet these requirements will not be considered in depth.

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“…On the other hand, the gasochromic-type hydrogen sensor detects the change in color with the naked eye so that the user can qualitatively detect hydrogen leakage [ 23 ]. To take only the advantages of each type of sensors, there were some cases of simultaneous observations of color change and electrical signals by using different sensing materials respectively for gasochromic and chemiresistive response in the same sensor platform [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…Because gasochromic performance deteriorates due to amorphous crystallization, several researchers have reported research on crystalline WO 3 in order to improve the discoloration performance [ 23 ]. In addition, a WO 3 thin film in the form of a porous structure has a large surface area, has low resistance to charging and dissociated hydrogen diffusion, and shows high charge mobility [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Hydrogen Sensor Based on Pd/WO3 Showing Simultaneous Chemiresistive and Gasochromic Response

Kim,

Maeng,

Yang

et al. 2023

Nanomaterials

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The gasochromism of WO3, wherein the color of the material changes according to the reaction of gas, can immediately allow for the determination of the presence of hydrogen by the naked eye. We have also developed a hybrid hydrogen sensor for WO3, a metal oxide, that can simultaneously utilize its gasochromic response and resistance to hydrogen. Because the proposed sensor has a transparent electrode on a glass substrate, it is a structure that can not only reveal the change in resistance but also more clearly illustrate the gasochromic response. A hybrid sensing demonstration in a hydrogen leak environment was successfully performed to verify a sensor that was capable of utilizing the resistive and gasochromic response of WO3.

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Highly sensitive and wrappable room temperature wireless gasochromic and chemiresistive dual-response H2 sensors using spray coating

Cited by 6 publications

References 37 publications

Unraveling Mechanistic Differences in Optical and Electrical Sensors: Time-Resolved Operando UV–Vis Spectroscopy of p-Type Perovskite Gas Sensors

Unraveling Mechanistic Differences in Optical and Electrical Sensors: Time-Resolved Operando UV–Vis Spectroscopy of p-Type Perovskite Gas Sensors

Critical Sensing Modalities for Hydrogen: Technical Needs and Status of the Field to Support a Changing Energy Landscape

Hybrid Hydrogen Sensor Based on Pd/WO3 Showing Simultaneous Chemiresistive and Gasochromic Response

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