A selective NH3 gas sensor based on Fe2O3–ZnO nanocomposites at room temperature

Tang, Haoneng; Yan, Mi; Zhang, Hui; Li, Shenzhong; Ma, Xingfa; Wang, Mang; Yang, Deren

doi:10.1016/j.snb.2005.08.010

Cited by 160 publications

(71 citation statements)

References 27 publications

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“…The increasing concentrations of electrons and the existence of negative charge on the SnO 2 particles lead to downward bending of the conduction and valence bands. This result is accompanied by an increase in bonding energy of Sn and O ions in the lattice of SnO 2 with a corresponding shift of the bands in the XPS spectra (see, e.g., (Yang, et al, 2006). Correspondingly, a decrease in the binding energy of the In and O ions should be observed in the In 2 O 3 + lattice due to lowering of the electron density in the In 2 O 3 + crystals.…”

Section: Charge Transfer Processesmentioning

confidence: 99%

“…Mixed metal oxide systems containing metal oxides of different electronic structure which interact with each other offer much more promise than single oxides for sensitive and selective detection of various gases in the environment (de Lacy Costello, et al, 2002;Tang, et al, 2006;Shouli, et al, 2010;Ivanovskaya, et al, 2003). Interaction between the component of metal oxide systems can lead to a change in the electronic structure of the nanocrystals and, hence, affect their reactivity.…”

Section: Sensors Based On Mixed Metal Oxidesmentioning

confidence: 99%

See 1 more Smart Citation

Gas Semiconducting Sensors Based on Metal Oxide Nanocomposites

Трахтенберг¹,

Герасимов²,

Громов³

et al. 2012

JMSR

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This paper reviews the important problems associated with the synthesis of metal-oxide nanocomposites, charge transfer phenomena in these composites, their conductive and sensory properties, modeling of sensory effect and the role on this sensory effect of the electronic structure of the metal oxide. The size of metal particles and temperature significantly influence the efficiency of such systems. However, the electronic interactions between the different components of the nanocomposite films play the dominant role in the exploitation of the properties of such sensory systems. Depending on the chemical nature of the analyzed gas and the electronic structure of the semiconducting metal oxides, such interactions can result in either an increase or a decrease of the sensory effect. Thus, by varying the electronic structure of the metal oxide composite sensors as well as the temperature and size of the metal-oxide nanoparticles, the inherent characteristics of the sensor can be changed and tailored for detection of various gases. Such findings clearly open up new opportunities for development of novel selective sensors.

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Section: Charge Transfer Processesmentioning

confidence: 99%

Section: Sensors Based On Mixed Metal Oxidesmentioning

confidence: 99%

Gas Semiconducting Sensors Based on Metal Oxide Nanocomposites

Трахтенберг¹,

Герасимов²,

Громов³

et al. 2012

JMSR

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show abstract

“…These reasons make necessary the detection of NH 3 gas at room temperature. Researchers have also developed sensors based on various polymers, metal sulphides 7 , metal oxides [26][27][28] and their composites 29 , which can be used to detect NH 3 gas. But, it is more important to develop sensors that should be cheap and small in size and can be operated at room temperature.…”

Section: -26mentioning

confidence: 99%

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

et al. 2016

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The present research work explores the room temperature gas sensing ability of hybrid nanocomposites of metal sulphide nanoparticles with polypyrrole (PPy) matrix. Sonochemically synthesized both silver sulphide (Ag 2 S) and cadmium sulphide (CdS) nanoparticles were mixed in varying ratios with PPy matrix by in-situ oxidative polymerization route. The resulting PPy/(Ag 2 S:CdS) hybrid nanocomposites were analyzed by characterizing them using FTIR and UV-Visible spectroscopy, XRD, SEM, fourprobe conductivity method and gas sensing ability by two-probe gas sensing setup. The current-voltage (I-V) characteristics of the PPy hybrid nanocomposites revealed their semiconducting nature with an electrical conductivity in the range of 10 −4 to 10 −3 S/cm. As compared to pure PPy, their hybrid PPy/ (Ag 2 S:CdS) nanocomposites showed an enhancement in sensitivity towards ammonia gas detection. The results clearly indicated a synergistic effect between the Ag 2 S:CdS nanoparticles and the PPy matrix.

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“…In addition, 0.5 mol% is found to be an optimal WO 3 concentration which gives the highest sensitivity towards NO 2 . Other mixed oxides showing improved gas sensing properties include Cr 2 O 3 -WO 3 films for NO 2 in NO X mixtures (Cantalini, 2004), Fe 2 O 3 -ZnO films for NH 3 (Tang, 2006) and CuOCu x Fe 3-x O 4 (with 0 < x < 1) for CO 2 (Chapelle, 2010).…”

Section: Unique Propertiesmentioning

confidence: 99%

Nanocomposite Films for Gas Sensing

Yang¹

2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

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A selective NH3 gas sensor based on Fe2O3–ZnO nanocomposites at room temperature

Cited by 160 publications

References 27 publications

Gas Semiconducting Sensors Based on Metal Oxide Nanocomposites

Gas Semiconducting Sensors Based on Metal Oxide Nanocomposites

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

Nanocomposite Films for Gas Sensing

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