Palladium thin films on microfiber filtration paper as flexible substrate and its hydrogen gas sensing mechanism

Shahzamani, Zahra; Ranjbar, M.; Comini, Elisabetta; Goodarzi, Mehdi Torabi; Salamati, H.; Sberveglieri, Giorgio

doi:10.1016/j.ijhydene.2019.04.277

Cited by 12 publications

(8 citation statements)

References 34 publications

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“…In the early stages of hydrogen injection, the HILE mechanism dominates the response and after a while, as hydrogen absorption inside the sensor layer structure increases, PdH x formation dominates the scene. So, it is concluded that, with high enough exposure times, both mechanisms play a part 1 . For the 104‐2 sensor, during the injection of air into the chamber, the increase continues to even higher than the initial baseline resistance before hydrogen injection.…”

Section: Resultsmentioning

confidence: 97%

“…The decreasing resistance of the sensor upon exposure to hydrogen is related to the dominance of the HILE mechanism over the PdH x mechanism. With hydrogen concentrations of 125 ppm and above, PdH x mechanism becomes predominant 1,15,16 . It is noteworthy that with concentrations of 125 ppm and above, after purging hydrogen, the resistance did not recover and stayed at a new level.…”

Section: Resultsmentioning

confidence: 98%

“…But it is highly inflammable (explosive) in concentrations above 4% in ambient conditions. Hence, the detection (sensing) of hydrogen in low concentrations is of high importance 1‐6 …”

Section: Introductionmentioning

confidence: 99%

“…This leads to an increase in the connecting bridges in the palladium nanostructure layer and hence lower electrical resistance. Although these two mechanisms are believed to occur simultaneously, one dominated the scene 1,15,16 . The main characteristics of palladium hydrogen sensor are sensitivity, selectivity, stability, 7 and speed 13 (4S) 17‐ …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the sensor with porous paper substrate enjoyed a significantly higher sensitivity (up to 100 ppm concentration) and lower response time at room temperature in comparison to glass substrate. Shahzamani et al 1 coated micro cellulose filter paper with palladium by magnetron sputtering. Scanning electron microscope (SEM) micrographs showed the rupture of the palladium layer after exposure to hydrogen gas.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen detection properties of palladium sputtered polyacrylonitrile nanofibrous layers

Ahmadi

Tavanai

Ranjbar

et al. 2021

Polymers for Advanced Techs

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In this research, electrospun polyacrylonitrile (PAN) nanofibrous layers are investigated as substrate for palladium‐based resistive type hydrogen sensors. The fabricated sensors showed sensitivity to hydrogen with a concentration as low as 12 ppm at room temperature. Up to 50 ppm hydrogen concentration, hydrogen induced lattice expansion (HILE) constituted the mechanism, whereas, with concentrations of 125 ppm and higher, palladium hydride formation (PdHx) mechanism ruled. For equal palladium thickness, the response of the sensors increased with increasing nanofiber diameter. With constant diameter of nanofibers, response and response time increased with thicker palladium layer. The sensor with 104 nm nanofibers and 4 nm palladium layer showed the best behavior. The sensor with nanofibrous substrate showed a higher response and lower response time in comparison to glass, PAN film, and PAN fibrous (fiber diameter: 16 μm, non‐nanofiber) substrate.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 98%

“…But it is highly inflammable (explosive) in concentrations above 4% in ambient conditions. Hence, the detection (sensing) of hydrogen in low concentrations is of high importance 1‐6 …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hydrogen detection properties of palladium sputtered polyacrylonitrile nanofibrous layers

Ahmadi

Tavanai

Ranjbar

et al. 2021

Polymers for Advanced Techs

Self Cite

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Recent Progress of Nanostructured Sensing Materials from 0D to 3D: Overview of Structure–Property‐Application Relationship for Gas Sensors

2021

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Along with the progress of nanoscience and nanotechnology, nanomaterials with attractive structural and functional properties have gained more attention than ever before, especially in the field of electronic sensors. In recent years, the gas sensing devices have made great achievement and also created wide application prospects, which leads to a new wave of research for designing advanced sensing materials. There is no doubt that the characteristics are highly governed by the sensitive layers. For this reason, important advances for the outstanding, novel sensing materials with different dimensional structures including 0D, 1D, 2D, and 3D are reported and summarized systematically. The sensing materials cover noble metals, metal oxide semiconductors, carbon nanomaterials, metal dichalcogenides, g‐C3N4, MXenes, and complex composites. Discussion is also extended to the relation between sensing performances and their structure, electronic properties, and surface chemistry. In addition, some gas sensing related applications are also highlighted, including environment monitoring, breath analysis, food quality and safety, and flexible wearable electronics, from current situation and the facing challenges to the future research perspectives.

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Palladium and platinum thin films for low-concentration resistive hydrogen sensor: a comparative study

Kılınç

2021

J Mater Sci: Mater Electron

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Palladium thin films on microfiber filtration paper as flexible substrate and its hydrogen gas sensing mechanism

Cited by 12 publications

References 34 publications

Hydrogen detection properties of palladium sputtered polyacrylonitrile nanofibrous layers

Hydrogen detection properties of palladium sputtered polyacrylonitrile nanofibrous layers

Recent Progress of Nanostructured Sensing Materials from 0D to 3D: Overview of Structure–Property‐Application Relationship for Gas Sensors

Palladium and platinum thin films for low-concentration resistive hydrogen sensor: a comparative study

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