Investigation of Ammonia Gas Sensing Properties of Graphite Oxide

Bannov, Alexander G.; Prášek, Jan; Jašek, Ondřej; Shibaev, A. A.; Zajı́čková, Lenka

doi:10.1016/j.proeng.2016.11.169

Cited by 21 publications

(8 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon can be perfectly interpreted by interactions of surface hydroxyl groups with ammonia. As revealed in previous studies, the humidity in air can improve the ammonia adsorption and resultantly increase the sensor response [46,47]. A long-term work could decrease the site activities of adsorbed hydroxyl groups on the surface, leading to the sensitivity decreasing.…”

Section: Resultsmentioning

confidence: 92%

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

et al. 2019

View full text Add to dashboard Cite

VO2(B), VO2(M), and V2O5 are the most famous compounds in the vanadium oxide family. Here, their gas-sensing properties were investigated and compared. VO2(B) nanoflakes were first self-assembled via a hydrothermal method, and then VO2(M) and V2O5 nanoflakes were obtained after a heat-phase transformation in nitrogen and air, respectively. Their microstructures were evaluated using X-ray diffraction and scanning and transmission electron microscopies, respectively. Gas sensing measurements indicated that VO2(M) nanoflakes were gas-insensitive, while both VO2(B) and V2O5 nanoflakes were highly selective to ammonia at room temperature. As ammonia sensors, both VO2(B) and V2O5 nanoflakes showed abnormal p-type sensing characteristics, although vanadium oxides are generally considered as n-type semiconductors. Moreover, V2O5 nanoflakes exhibited superior ammonia sensing performance compared to VO2(B) nanoflakes, with one order of magnitude higher sensitivity, a shorter response time of 14–22 s, and a shorter recovery time of 14–20 s. These characteristics showed the excellent potential of V2O5 nanostructures as ammonia sensors.

show abstract

Section: Resultsmentioning

confidence: 92%

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

et al. 2019

View full text Add to dashboard Cite

show abstract

“…We expect that such sensors should detect NH 3 molecules at very low concentrations in a similar way as the organic gases mentioned above. It was experimentally confirmed that the oxidized graphene sensor is suitable for NH 3 detection [24].…”

Section: Solid-state Ammonia Sensorsmentioning

confidence: 80%

Ammonia Gas Sensors: Comparison of Solid-State and Optical Methods

et al. 2020

View full text Add to dashboard Cite

High precision and fast measurement of gas concentrations is important for both understanding and monitoring various phenomena, from industrial and environmental to medical and scientific applications. This article deals with the recent progress in ammonia detection using in-situ solid-state and optical methods. Due to the continuous progress in material engineering and optoelectronic technologies, these methods are among the most perceptive because of their advantages in a specific application. We present the basics of each technique, their performance limits, and the possibility of further development. The practical implementations of representative examples are described in detail. Finally, we present a performance comparison of selected practical application, accumulating data reported over the preceding decade, and conclude from this comparison.

show abstract

“…Chemical adsorption has been widely studied due to its advantages of having a large adsorption capacity. At present, the research and development of ammonia adsorbents has been extensive, such as activated carbon, 23−26 alumina or alumina composites, 27−29 zeolites, 30−34 porous organic polymers, 35 graphite oxide, 36 molecular sieves, 37 metal oxide nanoparticles, 38 and metal− organic frameworks. 39−42 Alkaline earth metal chlorides (AEMH) are considered one of the most promising NH 3 adsorbents due to their low adsorption temperature and high NH 3 adsorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

NH₃ Adsorption Performance of Silicon-Supported Metal Chlorides

Cheng

Wang

Shen

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Alkaline earth metal chlorides (AEMH) are considered to be the key to effectively solving the problem of NH 3 storage due to their ability to react with NH 3 to form stable ammonia complexes. This study attempted to investigate the NH 3 adsorption performance of four metal chlorides (CuCl 2 , MnCl 2 , MgCl 2 , and CaCl 2 ) and silicon-supported composite adsorbents with a fixed bed. The adsorbents were characterized by X-ray diffraction, Brunauer−Emmett−Teller, and scanning electron microscopy to analyze the NH 3 adsorption behavior. The experiment found that the NH 3 adsorption capacity of four metal chlorides is in order: CuCl 2 > MnCl 2 > MgCl 2 > CaCl 2 , and the adsorption capacity of metal chlorides decreased with the increase in temperature. In addition, the composite adsorbents of silicon-supported metal chlorides were synthesized by the wet impregnation method. Ammonia adsorption experiments showed that silicon can significantly improve the NH 3 adsorption capacity of metal chlorides, and the NH 3 adsorption capacity of MnCl 2 /silicon was 127.5% higher than that of MnCl 2 . Silicon played the role of the skeleton support in the metal chloride particles, hindering the agglomeration between particles and increasing the number of pores on the surface of the particles, which was conducive to the diffusion of NH 3 through the pores into the particles for adsorption.

show abstract

Investigation of Ammonia Gas Sensing Properties of Graphite Oxide

Cited by 21 publications

References 8 publications

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

Ammonia Gas Sensors: Comparison of Solid-State and Optical Methods

NH₃ Adsorption Performance of Silicon-Supported Metal Chlorides

Contact Info

Product

Resources

About

Investigation of Ammonia Gas Sensing Properties of Graphite Oxide

Cited by 21 publications

References 8 publications

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

Self-Assembled Vanadium Oxide Nanoflakes for p-Type Ammonia Sensors at Room Temperature

Ammonia Gas Sensors: Comparison of Solid-State and Optical Methods

NH3 Adsorption Performance of Silicon-Supported Metal Chlorides

Contact Info

Product

Resources

About

NH₃ Adsorption Performance of Silicon-Supported Metal Chlorides