Nanogap-controlled Pd coating for hydrogen sensitive switches and hydrogen sensors

Shim, Young Seok; Jang, Byungjin; Suh, Jun Min; Noh, Myoung Sub; Kim, Sangtae; Han, Soo Deok; Song, Young Geun; Kim, Do Hong; Kang, Chong Yun; Jang, Ho Won; Lee, Wooyoung

doi:10.1016/j.snb.2017.08.198

Cited by 46 publications

(27 citation statements)

References 44 publications

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“…Figure 4F shows the comparative limits of detection (LOD) of our system with other Pd-based H2 sensors operated at r.t. in air, as reported in recent literature (see the summary in Table S3). 4,[8][9][10][43][44][45][46][47][48][49][50][51] As shown, although the response times are not fast, the ITPES-PdPt NPs sensors show a superior H2 LOD as compared to previous Pdbased H2 sensors.…”

Section: Sensing Characteristics Of Itpes-pdpt Npsmentioning

confidence: 85%

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

Koo

Kim

et al. 2020

Chem

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Section: Sensing Characteristics Of Itpes-pdpt Npsmentioning

confidence: 85%

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

Koo

Kim

et al. 2020

Chem

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“…Figure 4b shows how a partially suspended Pd structure relieves the stress compared with a fully anchored Pd structure in a mechanical simulation. There was also an attempt to create a high‐sensitivity sensor by utilizing volume expansion through the application of specific nanomaterial structures 83,84,195–199. When nanogaps are manufactured in an aligned and controlled form with consideration of volume expansion depending on the concentration of H 2 , a switch‐type H 2 sensor could be produced (Figure 4c,d).…”

Section: High‐performance Sensors Using Geometrically Structured Nanomentioning

confidence: 99%

Geometrically Structured Nanomaterials for Nanosensors, NEMS, and Nanosieves

Seo

Yoo

et al. 2020

Advanced Materials

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Recently, geometrically structured nanomaterials have received great attention due to their unique physical and chemical properties, which originate from the geometric variation in such materials. Indeed, the use of various geometrically structured nanomaterials has been actively reported in enhanced‐performance devices in a wide range of applications. Recent significant progress in the development of geometrically structured nanomaterials and associated devices is summarized. First, a brief introduction of advanced nanofabrication methods that enable the fabrication of various geometrically structured nanomaterials is given, and then the performance enhancements achieved in devices utilizing these nanomaterials, namely, i) physical and gas nanosensors, ii) nanoelectromechanical devices, and iii) nanosieves are described. For the device applications, a systematic summary of their structures, working mechanisms, fabrication methods, and output performance is provided. Particular focus is given to how device performance can be enhanced through the geometric structures of the nanomaterials. Finally, perspectives on the development of novel nanomaterial structures and associated devices are presented.

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“…Metal-oxide-semiconductor (MOS) based sensors can be used in a portable gas sensing system owing to several of their advantages, including high-sensitivity, fast response-time, compact size, and low cost. Specifically, it is easy to fabricate nanostructures to achieve high-sensitivity [26][27][28][29][30][31]. Many metal oxides, including SnO 2 , ZnO, WO 3 , TiO 2 , In 2 O 3 , Nb 2 O 5 , FeO, NiO, Fe 2 O 3 , Ga 2 O 3 , MoO 3 , Sb 2 O 5 , and V 2 O 5 , which exhibit a large variation in electrical resistance after exposure to hydrogen gas, have been investigated for use as hydrogen sensing materials in MOS [27,28].…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Selective Detection of Hydrogen Using Pd-Coated SnO2 Nanorod Arrays for Breath-Analyzer Applications

Jung

Hwang

Choe³

et al. 2022

Sensors

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We report a breath hydrogen analyzer based on Pd-coated SnO2 nanorods (Pd-SnO2 NRs) sensor integrated into a miniaturized gas chromatography (GC) column. The device can measure a wide range of hydrogen (1–100 ppm), within 100 s, using a small volume of human breath (1 mL) without pre-concentration. Especially, the mini-GC integrated with Pd-SnO2 NRs can detect 1 ppm of H2, as a lower detection limit, at a low operating temperature of 152 °C. Furthermore, when the breath hydrogen analyzer was exposed to a mixture of interfering gases, such as carbon dioxide, nitrogen, methane, and acetone, it was found to be capable of selectively detecting only H2. We found that the Pd-SnO2 NRs were superior to other semiconducting metal oxides that lack selectivity in H2 detection. Our study reveals that the Pd-SnO2 NRs integrated into the mini-GC device can be utilized in breath hydrogen analyzers to rapidly and accurately detect hydrogen due to its high selectivity and sensitivity.

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Nanogap-controlled Pd coating for hydrogen sensitive switches and hydrogen sensors

Cited by 46 publications

References 44 publications

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

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

Geometrically Structured Nanomaterials for Nanosensors, NEMS, and Nanosieves

Highly Sensitive and Selective Detection of Hydrogen Using Pd-Coated SnO2 Nanorod Arrays for Breath-Analyzer Applications

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