Highly sensitive and selective sensors to volatile organic compounds using MWCNTs/SnO2

Ahmadnia-Feyzabad, Sadegh; Khodadadi, Abbas Ali; Vesali‐Naseh, Masoud; Mortazavi, Yadollah

doi:10.1016/j.snb.2012.02.024

Cited by 73 publications

(38 citation statements)

References 25 publications

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“…On the other hand, the lower amount of toluene is weakly adsorbed on the sensor's surface because of steric hindrance of its aromatic ring [9]. Possible chemical reactions for the target gases at the surface can be described as follows [28] Based on these equations, the reaction of one ethanol molecule with surface oxygen would release 6 electrons into the semiconductor conduction band compared to one electron per carbon monoxide molecule.…”

Section: The Sensing Propertiesmentioning

confidence: 99%

“…According to Figure 9(a), relatively fast and similar responses to CO and ethanol are observed. These compounds have one oxygen atom in their structure that can facilitate the reaction of their adsorbed species with the surface oxygen species [9]. SG5 sensor's response to acetone and toluene lags behind that of ethanol, and the most sluggish response is observed for methane.…”

Section: The Sensing Propertiesmentioning

confidence: 99%

“…SnO 2 -based gas sensors typically operate by monitoring changes in surface conductivity. Oxygen species, mainly in the form of O , are generated by dissociative chemisorption of oxygen molecules on SnO 2 surface followed by electron depletion from the surface, resulting in a decrease in conductivity [9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Graphene oxide/SnO2 Nanocomposite as Sensing Material for Breathalyzers: Selective Detection of Ethanol in the presence of Automotive CO and Hydrocarbons Emissions

et al. 2017

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Abstract. SnO 2 was ultrasonically deposited (precipitated) in the presence of di erent amounts of graphene oxide (GO) prepared by the modi ed Hummers' method. The resulting nanocomposites were used as sensing material for the detection of 1000 ppm CO and VOCs including ethanol, acetone and toluene, and CH 4 in a temperature range of 150-300 C. The nanocomposites were characterized by Raman spectroscopy, XRD, BET surface area measurement, FT-IR, and SEM methods. It seems that SnO 2 layers were deposited on the GO surface and incorporated into the matrix. This resulted in 47% increase in the nanocomposite BET surface area. The addition of 0.1 wt% GO to SnO2 increased the response to CO by about 6 times at 300 C. 0.05 wt% GO as an optimum amount was included in SnO2 up to 2-fold enhancement in response to ethanol, and toluene was observed. At 250 C, the highest response to ethanol was obtained, which is 120, 114, 1400, and 15 times larger than the responses to CO, toluene, methane and acetone, respectively, making the sensors quite selective to ethanol. Furthermore, this sensor exhibited good response in the low concentration of ethanol.

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Section: The Sensing Propertiesmentioning

confidence: 99%

Section: The Sensing Propertiesmentioning

confidence: 99%

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Graphene oxide/SnO2 Nanocomposite as Sensing Material for Breathalyzers: Selective Detection of Ethanol in the presence of Automotive CO and Hydrocarbons Emissions

et al. 2017

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“…Ma et al used a structurally similar system for the detection of chloroform vapor, a prime example among the volatile organic compounds that play a role in both industry and medical diagnostics [66,67]. Their sensor device consisted of an array of triangular silver nanoparticles, covered with a poly(methyl methacrylate) (PMMA) transduction layer which provided the reagent sensitivity [68].…”

Section: Large-area Nanostructured Sensor Chipsmentioning

confidence: 99%

Plasmonic gas and chemical sensing

2014

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Sensitive and robust detection of gases and chemical reactions constitutes a cornerstone of scientific research and key industrial applications. In an effort to reach progressively smaller reagent concentrations and sensing volumes, optical sensor technology has experienced a paradigm shift from extended thin-film systems towards engineered nanoscale devices. In this size regime, plasmonic particles and nanostructures provide an ideal toolkit for the realization of novel sensing concepts. This is due to their unique ability to simultaneously focus light into subwavelength hotspots of the electromagnetic field and to transmit minute changes of the local environment back into the farfield as a modulation of their optical response. Since the basic building blocks of a plasmonic system are commonly noble metal nanoparticles or nanostructures, plasmonics can easily be integrated with a plethora of chemically or catalytically active materials and compounds to investigate processes ranging from hydrogen absorption in palladium to the detection of trinitrotoluene (TNT). In this review, we will discuss a multitude of plasmonic sensing strategies, spanning the technological scale from simple plasmonic particles embedded in extended thin films to highly engineered complex plasmonic nanostructures. Due to their flexibility and excellent sensing performance, plasmonic structures may open an exciting pathway towards the detection of chemical and catalytic events down to the single molecule level.

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“…It purifies and separates acetylene, 1,3-butadiene, acid gases and aliphatic hydrocarbons. DMF is also used in the production of polyacrylic or cellulose triacetate fibres and pharmaceuticals or in the production of polyurethane resin for synthetic leather (Fiorito et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite sensors of propylene glycol, dimethylformamide and formaldehyde vapors

Adamyan

Sayunts

Aroutiounian

et al. 2018

J. Sens. Sens. Syst.

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Abstract. The results of research works related to the study of thick-film multiwall carbon nanotube-tin oxide nanocomposite sensors of propylene glycol (PG), dimethylformamide (DMF) and formaldehyde (FA) vapors are presented in this paper. These sensors were derived using hydrothermal synthesis and sol-gel methods. Investigations of response-recovery characteristics in the 50-300 • C operating temperature range reveal that the optimal operating temperature for PG, DMF and FA vapor sensors, taking into account both high response and acceptable response and recovery times are about 200 and 220 • C, respectively. The dependence of the sensor response on gas concentration is linear in all cases. Minimal propylene glycol, dimethylformamide and formaldehyde gas concentrations, where the perceptible signal was noticed, were 13, 5 and 115 ppm, respectively.

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Highly sensitive and selective sensors to volatile organic compounds using MWCNTs/SnO2

Cited by 73 publications

References 25 publications

Graphene oxide/SnO2 Nanocomposite as Sensing Material for Breathalyzers: Selective Detection of Ethanol in the presence of Automotive CO and Hydrocarbons Emissions

Graphene oxide/SnO2 Nanocomposite as Sensing Material for Breathalyzers: Selective Detection of Ethanol in the presence of Automotive CO and Hydrocarbons Emissions

Plasmonic gas and chemical sensing

Nanocomposite sensors of propylene glycol, dimethylformamide and formaldehyde vapors

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