Effects of tin oxide semiconductor-electrode interface on gas-sensitivity characteristics

Fukui, Kiyoshi; Nakane, Masanori

doi:10.1016/0925-4005(93)85104-i

Cited by 8 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even though there has been no unequivocal agreement so far about how the electrode materials affect the sensing behavior of a chemiresistive sensor 33 , there has been increasing evidence showing that different electrode metals react with analytes differently 18 , 34 , 35 . Some electrode metals, such as Au and palladium, can function as catalysts and contribute to the overall conductance and the sensitivity of the sensors 34 , 36 – 39 . “Porosity effects” originated from the creation of pores in the Au IDEs that led to increased Schottky contacts between the porous Au IDEs and the semiconducting SWCNTs.…”

Section: Discussionmentioning

confidence: 99%

Sensitivity enhancement of flexible gas sensors via conversion of inkjet-printed silver electrodes into porous gold counterparts

Fang

Akbari

Hester

et al. 2017

Sci Rep

View full text Add to dashboard Cite

This work describes a facile, mild and general wet chemical method to change the material and the geometry of inkjet-printed interdigitated electrodes (IDEs) thus drastically enhancing the sensitivity of chemiresistive sensors. A novel layer-by-layer chemical method was developed and used to uniformly deposit semiconducting single-wall carbon nanotube (SWCNT)-based sensing elements on a Kapton® substrate. Flexible chemiresistive sensors were then fabricated by inkjet-printing fine-featured silver IDEs on top of the sensing elements. A mild and facile two-step process was employed to convert the inkjet-printed dense silver IDEs into their highly porous gold counterparts under ambient conditions without losing the IDE-substrate adhesion. A proof-of-concept gas sensor equipped with the resulting porous gold IDEs featured a sensitivity to diethyl ethylphosphonate (DEEP, a simulant of the nerve agent sarin) of at least 5 times higher than a similar sensor equipped with the original dense silver IDEs, which suggested that the electrode material and/or the Schottky contacts between the electrodes and the SWCNTs might have played an important role in the gas sensing process.

show abstract

Section: Discussionmentioning

confidence: 99%

Sensitivity enhancement of flexible gas sensors via conversion of inkjet-printed silver electrodes into porous gold counterparts

Fang

Akbari

Hester

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…An unequivocal agreement has not been reached so far regarding how the sensing behavior of a chemiresistive sensor is affected by the material that its electrodes are made of [34], but more and more evidence shows that different electrode metals react with an target analyte differently [16,35,36]. Sensor electrodes that are made of a noble metal (such as palladium and gold) can act as catalysts and contribute to the overall electrical conductance and the sensor sensitivity [35,[37][38][39][40]. "Porosity effects" refer to the fact that increased number of nano−/micro-scale pores in the electrodes lead to increased Schottky contacts that contribute to the enhanced sensitivity.…”

Section: Discussionmentioning

confidence: 99%

Converting Silver Electrodes into Porous Gold Counterparts: A Strategy to Enhance Gas Sensor Sensitivity and Chemical Stability via Electrode Engineering

Fang¹

2023

Gold Nanoparticles and Their Applications in Engineering

View full text Add to dashboard Cite

This chapter describes a strategy for sensitivity and chemical stability enhancement of chemiresistive gas sensors via electrode engineering. In this strategy, flexible chemiresistive gas sensors were fabricated by uniformly depositing functionalized semiconducting carbon nanotubes (CNTs) on a polyimide substrate via a novel layer-by-layer wet chemical method, followed by inkjet printing fine-featured silver interdigitated electrodes (IDEs) on the substrate. The electrode engineering was realized by converting the inkjet-printed IDEs into their highly porous and chemically stable gold counterparts via a mild and facile two-step process, with the substrate-IDE adhesion retained. As a proof-of-concept demonstration, a diethyl ethylphosphonate (DEEP, a simulant of the nerve agent sarin) sensor equipped with inkjet-printed dense silver IDEs was converted into its counterpart equipped with highly porous gold IDEs. The resulting gold-electrode gas sensor exhibited sensitivity to DEEP of at least fivefold higher than a similar sensor electrode with the dense silver IDEs. The sensitivity enhancement was probably due to the catalytic activity of the resulting gold IDEs, as well as the creation of the nano−/micro-scale pores in the gold IDEs that increased the Schottky contacts between the gold IDEs and the semiconducting CNTs.

show abstract

Electrodes and Heaters in MOX-Based Gas Sensors

Korotcenkov

2013

Integrated Analytical Systems

View full text Add to dashboard Cite

Effects of tin oxide semiconductor-electrode interface on gas-sensitivity characteristics

Cited by 8 publications

References 4 publications

Sensitivity enhancement of flexible gas sensors via conversion of inkjet-printed silver electrodes into porous gold counterparts

Sensitivity enhancement of flexible gas sensors via conversion of inkjet-printed silver electrodes into porous gold counterparts

Converting Silver Electrodes into Porous Gold Counterparts: A Strategy to Enhance Gas Sensor Sensitivity and Chemical Stability via Electrode Engineering

Electrodes and Heaters in MOX-Based Gas Sensors

Contact Info

Product

Resources

About