A highly selective room temperature ammonia sensor using spray deposited zinc oxide thin film

Mani, Ganesh Kumar; Rayappan, John Bosco Balaguru

doi:10.1016/j.snb.2013.03.132

Cited by 250 publications

(96 citation statements)

References 50 publications

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“…1 It can even be generally produced in natural processes in animals, human and plants. 2 Ammonia can irritates skin, eyes and respiratory tract of humans when the concentration reaches to a certain value (the safety threshold is ∼25 ppm in air).…”

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confidence: 99%

Effective Room-Temperature Ammonia-Sensitive Composite Sensor Based on Graphene Nanoplates and PANI

Chen

Liu

et al. 2018

ECS J. Solid State Sci. Technol.

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The graphene nanoplate (GN)-polyaniline (PANI) composite was developed via in-situ polymerization method and simultaneously assembled on interdigital electrodes (IDEs) at low temperature for ammonia (NH 3 ) detection. The assembled composite sensor showed excellent sensing performance toward different concentrations of NH 3 , 1.5 of response value and 123 s/204 s for the response/recovery time to 15 ppm NH 3 . Meanwhile, an interesting supersaturation phenomenon was observed at high concentration of NH 3 . A reasonable speculation was proposed for this special sensing behavior and the mechanism for enhanced sensing properties was also analyzed. Among the toxic gases of the interest, ammonia is a prominent example for its wide applications in industrial manufacturing and daily life. 1 It can even be generally produced in natural processes in animals, human and plants. 2 Ammonia can irritates skin, eyes and respiratory tract of humans when the concentration reaches to a certain value (the safety threshold is ∼25 ppm in air). 3 It is also flammable at concentration of ca. 15%-28% by volume in air. 4 Therefore, many approaches have been employed to detect ammonia, including gas chromatography, 5 polarography, 6 fluorometry 7 and spectrophotometry. 8 Meanwhile, with the consideration of the need for cheap, fast and efficient sensors, semiconductor-based gas sensors have been developed quickly. 9 As an emerging 2-D material, graphene has attracted much attention worldwide for its large specific surface area 10 and excellent electrical properties. 11,12 However, no material can be satisfactorily applied in any field, especially in complex scenarios. Theoretical and experimental studies have shown graphene performs limited selectivity to different kinds of gas species. 13 Composition with other functional materials would be an expectable choice. The conducting polymer, especially polyaniline (PANI), 14 is a promising choice, as their low cost and ability for room-temperature detection. 15 Extensive studies reported that the composite of PANI and graphene demonstrates efficient charge transport and collection, 16 as well as enhanced thermal and chemical stability. 17 Herein, GN-PANI nanocomposite film was synthesized by in-situ chemical oxidative polymerization of aniline in a functional graphene nanoplate (GN) suspension, and was simultaneously assembled onto a substrate with interdigital electrodes (IDEs) at low temperature. It suggests that the composite film sensor shows enhanced π electrons conjugation system, large specific surface area and stronger intermolecular interaction. Benefit from this, the composite showed a much improved sensing performance comparing with bare GN and bare PANI based sensors. z E-mail: zhichen@engr.uky.edu; taitai1980@uestc.edu.cn ExperimentalMaterials.-Aniline (≥99.5%), poly (diallyldimenthylammonium chloride) solution (PDDA) and poly (sodium 4-styrenesulfonate) (PSS) were purchased from Sigma-Aldrich Co., USA. Ammonium persulfate (APS) and hydrochloric acid (HCl) were obtained from Chen...

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confidence: 99%

Effective Room-Temperature Ammonia-Sensitive Composite Sensor Based on Graphene Nanoplates and PANI

Chen

Liu

et al. 2018

ECS J. Solid State Sci. Technol.

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“…When the sensor material is exposed to vapors of ammonia, the superficial reactions of NH 3 molecules with the oxygen species caused more electrons to return to the conduction band because ammonia acting as the electron donor. The surface reactions between the NH 3 and the sensor material can be described as follows [18][19][20][21] where O − (ads), NO 2 − (ads), and NO 3 − (ads) represent negatively charged chemisorbed species, and e − free electrons available for electrical conduction. The relations means that when the sensor is exposed to NH 3 containing gas, electrons trapped by the adsorptive states will be released, leading to a decrease in sensor resistance, as experimentally observed (Fig.…”

Section: Resultsmentioning

confidence: 99%

ROOM-TEMPERATURE NH3 GAS SENSORS BASED ON HETEROSTRUCTURES PbS/CdS

Prokopenko¹,

Gunja²,

Makhno³

et al. 2017

Him. Fiz. Tehnol. Poverhni

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“…Reactions of NH3 molecules with the oxygen species cause more electrons to return to the conduction band because ammonia acts as a donor of electrons. The surface reactions between the NH3 and the sensor material can be described as shown in (6)- (8) [ [18][19][20]:…”

Section: Resultsmentioning

confidence: 99%

Room-temperature gas sensor based on semiconductor nanoscale heterostructures ZnS/CdS

Prokopenko¹,

Gunya²,

Makhno³

et al. 2017

Him. Fiz. Tehnol. Poverhni

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A highly selective room temperature ammonia sensor using spray deposited zinc oxide thin film

Cited by 250 publications

References 50 publications

Effective Room-Temperature Ammonia-Sensitive Composite Sensor Based on Graphene Nanoplates and PANI

Effective Room-Temperature Ammonia-Sensitive Composite Sensor Based on Graphene Nanoplates and PANI

ROOM-TEMPERATURE NH3 GAS SENSORS BASED ON HETEROSTRUCTURES PbS/CdS

Room-temperature gas sensor based on semiconductor nanoscale heterostructures ZnS/CdS

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