Detection of combustible gases by means of a ZnO-on-Si surface acoustic wave (SAW) delay line

Anisimkim, V.I; Penza, M.; Valentini, A.; Quaranta, F.; Vasanelli, L.

doi:10.1016/0925-4005(94)01273-k

Cited by 43 publications

(15 citation statements)

References 10 publications

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“…The Mn doped ZnO samples (X3, X4, X5, X6 and X7) show similar decomposition characteristics: the rst decompositions are shown with weight loss of 1.75% for X3, 1.16% for X4, 2.4% for X5, 2.36% for X6 and 2.36% for X7, respectively from room temperature to the range of 477-486 C are mainly due to the removal of physically and chemically adsorbed water, the decomposition of the hydroxide group on the surface of the nanopowder. 45,46 The second decompositions are observed with weight loss of 0.4% for X3, 0.42% for X4, 0.43% for X5, 0.4% for X6 and 0.39% for X7 from 330 to 700 C. The observed weight losses are due to the decomposition of PEG and other impurities. The DTA curves of X3-X7 show wide endothermic peaks between 30 C and 250 C which demonstrate that the decomposition of OH À groups and the removal of adsorbed water.…”

Section: Thermal Analysis Of the Zno : Mn Nanopowdersmentioning

confidence: 94%

“…These results are in agreement with the characteristics of ZnO nanoparticles reported in literature. 43,44 According to formation mechanism, ZnO is obtained by decomposition of [Zn(OH) 4 ] 2À . It is expected that the OH À ions and H 2 O molecules have been adsorbed on the surface of formed ZnO nanopowders.…”

Section: Thermal Analysis Of the Zno : Mn Nanopowdersmentioning

confidence: 99%

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The effect of growing time and Mn concentration on the defect structure of ZnO nanocrystals: X-ray diffraction, infrared and EPR spectroscopy

et al. 2016

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Section: Thermal Analysis Of the Zno : Mn Nanopowdersmentioning

confidence: 94%

Section: Thermal Analysis Of the Zno : Mn Nanopowdersmentioning

confidence: 99%

The effect of growing time and Mn concentration on the defect structure of ZnO nanocrystals: X-ray diffraction, infrared and EPR spectroscopy

et al. 2016

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“…A number of simple sensors such as those based on metal oxides [64]Author V, catalytic based sensors such as pellistors [65] or other catalytic sensors [66], semistors [67] and piezoelectric sensors [68,69] and SAW devices [70] have been deployed in the detection of methane. New materials such as carbon nanotubes have been utilized to enable room temperature detection of methane [71].…”

Section: Analytical Methods For Methane Detection and Breath Testingmentioning

confidence: 99%

The importance of methane breath testing: a review

Costello¹,

Ledochowski²,

Ratcliffe³

2013

J. Breath Res.

162

132

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Sugar malabsorption in the bowel can lead to bloating, cramps, diarrhea and other symptoms of irritable bowel syndrome as well as affecting absorption of other nutrients. The hydrogen breath test is now a well established noninvasive test for assessing malabsorption of sugars in the small intestine. However, there are patients who can suffer from the same spectrum of malabsorption issues but who produce little or no hydrogen, instead producing relatively large amounts of methane. These patients will avoid detection with the traditional breath test for malabsorption based on hydrogen detection. Likewise the hydrogen breath test is an established method for small intestinal bacterial overgrowth (SIBO) diagnoses. Therefore, a number of false negatives would be expected for patients who solely produce methane. Usually patients produce either hydrogen or methane, and only rarely there are significant co-producers, as typically the methane is produced at the expense of hydrogen by microbial conversion of carbon dioxide. Various studies show that methanogens occur in about a third of all adult humans; therefore, there is significant potential for malabsorbers to remain undiagnosed if a simple hydrogen breath test is used. As an example, the hydrogen-based lactose malabsorption test is considered to result in about 5-15% false negatives mainly due to methane production. Until recently methane measurements were more in the domain of research laboratories, unlike hydrogen analyses which can now be undertaken at a relatively low cost mainly due to the invention of reliable electrochemical hydrogen sensors. More recently, simpler lower cost instrumentation has become commercially available which can directly measure both hydrogen and methane simultaneously on human breath. This makes more widespread clinical testing a realistic possibility. The production of small amounts of hydrogen and/or methane does not normally produce symptoms, whereas the production of higher levels can lead to a wide range of symptoms ranging from functional disorders of the bowel to low level depression. It is possible that excess methane levels may have more health consequences than excess hydrogen levels. This review describes the health consequences of methane production in humans and animals including a summary of the state of the art in detection methods. In conclusion, the combined measurement of hydrogen and methane should offer considerable improvement in the diagnosis of malabsorption syndromes and SIBO when compared with a single hydrogen breath test.

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“…53 The distance between the input IDT and readout IDT is the delay line, and the sensing layer is deposited in this region of the substrate. 54 SAW delay line devices can be designed as one- or two-channel devices, where the latter consists of two SAW delay line devices fabricated parallel to each other. One of the channels does not have a sensing layer and thus acts as a baseline for the sensing channel.…”

Section: Saw-based Sensorsmentioning

confidence: 99%

Surface acoustic wave devices for chemical sensing and microfluidics: a review and perspective

et al. 2017

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Surface acoustic waves (SAWs), are electro-mechanical waves that form on the surface of piezoelectric crystals. Because they are easy to construct and operate, SAW devices have proven to be versatile and powerful platforms for either direct chemical sensing or for upstream microfluidic processing and sample preparation. This review summarizes recent advances in the development of SAW devices for chemical sensing and analysis. The use of SAW techniques for chemical detection in both gaseous and liquid media is discussed, as well as recent fabrication advances that are pointing the way for the next generation of SAW sensors. Similarly, applications and progress in using SAW devices as microfluidic platforms are covered, ranging from atomization and mixing to new approaches to lysing and cell adhesion studies. Finally, potential new directions and perspectives on the field as it moves forward are offered, with a specific focus on potential strategies for making SAW technologies for bioanalytical applications.

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Detection of combustible gases by means of a ZnO-on-Si surface acoustic wave (SAW) delay line

Cited by 43 publications

References 10 publications

The effect of growing time and Mn concentration on the defect structure of ZnO nanocrystals: X-ray diffraction, infrared and EPR spectroscopy

The effect of growing time and Mn concentration on the defect structure of ZnO nanocrystals: X-ray diffraction, infrared and EPR spectroscopy

The importance of methane breath testing: a review

Surface acoustic wave devices for chemical sensing and microfluidics: a review and perspective

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