Enhanced Nitrogen Dioxide Gas-Sensing Performance Using Tantalum Pentoxide-Alloyed Indium Oxide Sensing Membrane

Jian, Li-Yi; Lee, Hsin-Ying; Lee, Ching-Ting

doi:10.1109/jsen.2019.2919659

Cited by 13 publications

(3 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, the reaction rate and operating temperature were mainly affected by the activation energy (E A ) in the gas sensors. The activation energy of the Ga 2 O 3 nanorod-structured NO 2 gas sensors was calculated using the following Arrhenius equation [ 30 ]:

where R 0 is the pre-exponential factor, k is the Boltzmann constant, and T is the absolute temperature, respectively. The activation energy is determined by the slope of the Arrhenius plot.…”

Section: Resultsmentioning

confidence: 99%

Investigation of High-Sensitivity NO2 Gas Sensors with Ga2O3 Nanorod Sensing Membrane Grown by Hydrothermal Synthesis Method

Chu

Yeh

et al. 2023

Nanomaterials

Self Cite

View full text Add to dashboard Cite

In this work, Ga2O3 nanorods were converted from GaOOH nanorods grown using the hydrothermal synthesis method as the sensing membranes of NO2 gas sensors. Since a sensing membrane with a high surface-to-volume ratio is a very important issue for gas sensors, the thickness of the seed layer and the concentrations of the hydrothermal precursor gallium nitrate nonahydrate (Ga(NO3)3·9H2O) and hexamethylenetetramine (HMT) were optimized to achieve a high surface-to-volume ratio in the GaOOH nanorods. The results showed that the largest surface-to-volume ratio of the GaOOH nanorods could be obtained using the 50-nm-thick SnO2 seed layer and the Ga(NO3)3·9H2O/HMT concentration of 12 mM/10 mM. In addition, the GaOOH nanorods were converted to Ga2O3 nanorods by thermal annealing in a pure N2 ambient atmosphere for 2 h at various temperatures of 300 °C, 400 °C, and 500 °C, respectively. Compared with the Ga2O3 nanorod sensing membranes annealed at 300 °C and 500 °C, the NO2 gas sensors using the 400 °C-annealed Ga2O3 nanorod sensing membrane exhibited optimal responsivity of 1184.6%, a response time of 63.6 s, and a recovery time of 135.7 s at a NO2 concentration of 10 ppm. The low NO2 concentration of 100 ppb could be detected by the Ga2O3 nanorod-structured NO2 gas sensors and the achieved responsivity was 34.2%.

show abstract

where R 0 is the pre-exponential factor, k is the Boltzmann constant, and T is the absolute temperature, respectively. The activation energy is determined by the slope of the Arrhenius plot.…”

Section: Resultsmentioning

confidence: 99%

Investigation of High-Sensitivity NO2 Gas Sensors with Ga2O3 Nanorod Sensing Membrane Grown by Hydrothermal Synthesis Method

Chu

Yeh

et al. 2023

Nanomaterials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Activation energy ( E A ) is an important characteristic factor for affecting the reaction rate and operating temperature of gas sensors, which is calculated using the following Arrhenius equation , R s ( T ) = R 0 e E A / kT ln [ R normals false( T false) ] = ln nobreak0em0.25em⁡ ( R 0 ) + ( E A 1000 K ) true( 1000 T true) where R s ( T ), R 0 , and K are the resistance of NO 2 gas sensors at absolute temperature T , pre-exponential factor, and Boltzmann constant, respectively. Figure illustrates the Arrhenius plot ( R s ( T ) vs 1000/ T ) of the various NO 2 gas sensors.…”

Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Results and Discussionmentioning

confidence: 99%

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Chu,

Wu,

Yeh

et al. 2023

ACS Sens.

Self Cite

View full text Add to dashboard Cite

In this work, a vapor cooling condensation system was utilized to deposit various amounts of p-type gold-black nanoparticles (NPs) onto the surface of n-type gallium oxide (Ga 2 O 3 ) nanorods forming p−n heterojunction-structured sensing membranes of nitrogen dioxide (NO 2 ) gas sensors. The role and the sensing mechanism of the various gold-black NP-decorated Ga 2 O 3 nanorods in NO 2 gas sensors were investigated. The coverage and atomic percentage of the sensing membranes were observed using high-resolution transmission electron microscopy (HRTEM) measurements and energy-dispersive spectroscopy (EDS), respectively. For the NO 2 gas sensor using the sensing membrane of 60 s-deposited gold-black NP-decorated Ga 2 O 3 nanorods under a NO 2 concentration of 10 ppm, the highest responsivity of 5221.1% was obtained. This result was attributed to the spillover effect and the formation of the p−n heterojunction, which increased more ionized-oxygen adsorption sites and promoted the reaction between NO 2 gas and Ga 2 O 3 nanorods. Furthermore, the NO 2 gas sensor could detect the low NO 2 concentration of 100 ppb and achieved a responsivity of 56.9%. The resulting NO 2 gas sensor also exhibited excellent selectivity for detecting NO 2 gas, with higher responsivity at a NO 2 concentration of 10 ppm compared with that of the C 2 H 5 OH and NH 3 concentrations of 100 ppm.

show abstract

Enhanced NO2 gas sensing performance of the In2O3-decorated SnO2 nanowire sensor

Park

Jung

et al. 2021

Appl. Phys. A

View full text Add to dashboard Cite

Enhanced Nitrogen Dioxide Gas-Sensing Performance Using Tantalum Pentoxide-Alloyed Indium Oxide Sensing Membrane

Cited by 13 publications

References 37 publications

Investigation of High-Sensitivity NO2 Gas Sensors with Ga2O3 Nanorod Sensing Membrane Grown by Hydrothermal Synthesis Method

Investigation of High-Sensitivity NO2 Gas Sensors with Ga2O3 Nanorod Sensing Membrane Grown by Hydrothermal Synthesis Method

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes

Enhanced NO2 gas sensing performance of the In2O3-decorated SnO2 nanowire sensor

Contact Info

Product

Resources

About

Enhanced Nitrogen Dioxide Gas-Sensing Performance Using Tantalum Pentoxide-Alloyed Indium Oxide Sensing Membrane

Cited by 13 publications

References 37 publications

Investigation of High-Sensitivity NO2 Gas Sensors with Ga2O3 Nanorod Sensing Membrane Grown by Hydrothermal Synthesis Method

Investigation of High-Sensitivity NO2 Gas Sensors with Ga2O3 Nanorod Sensing Membrane Grown by Hydrothermal Synthesis Method

Sensing Mechanism and Characterization of NO2 Gas Sensors Using Gold-Black NP-Decorated Ga2O3 Nanorod Sensing Membranes

Enhanced NO2 gas sensing performance of the In2O3-decorated SnO2 nanowire sensor

Contact Info

Product

Resources

About

Sensing Mechanism and Characterization of NO₂ Gas Sensors Using Gold-Black NP-Decorated Ga₂O₃ Nanorod Sensing Membranes