Chemical sensors based on SAW resonators working at up to 1 GHz

Fischerauer, Gerhard; Dickert, Franz L.; Forth, P.; Knauer, U.

doi:10.1109/ultsym.1996.584007

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…Porogen imprinting was used in some of the earliest examples of MIPs for gas phase analysis, notably in Dickert’s quartz crystal microbalance (QCM) and surface acoustic wave (SAW) gravimetric sensors for various VOCs [ 62 , 63 , 136 , 192 ]. Amongst these were examples of selectivity in the presence of physically similar compounds (ethyl acetate and ethanol) and sensitively to 0.1 ppm variations in vapour concentration [ 62 ].…”

Section: Porogen Imprintingmentioning

confidence: 99%

Template Imprinting Versus Porogen Imprinting of Small Molecules: A Review of Molecularly Imprinted Polymers in Gas Sensing

Cowen

Cheffena

2022

IJMS

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The selective sensing of gaseous target molecules is a challenge to analytical chemistry. Selectivity may be achieved in liquids by several different methods, but many of these are not suitable for gas-phase analysis. In this review, we will focus on molecular imprinting and its application in selective binding of volatile organic compounds and atmospheric pollutants in the gas phase. The vast majority of indexed publications describing molecularly imprinted polymers for gas sensors and vapour monitors have been analysed and categorised. Specific attention was then given to sensitivity, selectivity, and the challenges of imprinting these small volatile compounds. A distinction was made between porogen (solvent) imprinting and template imprinting for the discussion of different synthetic techniques, and the suitability of each to different applications. We conclude that porogen imprinting, synthesis in an excess of template, has great potential in gas capture technology and possibly in tandem with more typical template imprinting, but that the latter generally remains preferable for selective and sensitive detection of gaseous molecules. More generally, it is concluded that gas-phase applications of MIPs are an established science, capable of great selectivity and parts-per-trillion sensitivity. Improvements in the fields are likely to emerge by deviating from standards developed for MIP in liquids, but original methodologies generating exceptional results are already present in the literature.

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Section: Porogen Imprintingmentioning

confidence: 99%

Template Imprinting Versus Porogen Imprinting of Small Molecules: A Review of Molecularly Imprinted Polymers in Gas Sensing

Cowen

Cheffena

2022

IJMS

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“…This is the one port or reflective delay line configuration. A delay line requires sufficient impedance matching for a tolerable insertion attenuation [ 59 ]. In addition, oscillator circuit design becomes complicated in this configuration as it offers relatively large phase changes (~2

) in its passband.…”

Section: Fundamental Conceptsmentioning

confidence: 99%

“…In resonators, sensing layer can be deposited on to the IDTs and the impedance matching requirement is not as stringent because they have relatively smaller insertion attenuation. Also, the oscillation design is simple as this configuration offers relatively small phase change (~

) in the passband [ 6 , 59 ].…”

Section: Fundamental Conceptsmentioning

confidence: 99%

SAW Sensors for Chemical Vapors and Gases

Devkota

Ohodnicki

Greve

2017

Sensors

229

147

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Surface acoustic wave (SAW) technology provides a sensitive platform for sensing chemicals in gaseous and fluidic states with the inherent advantages of passive and wireless operation. In this review, we provide a general overview on the fundamental aspects and some major advances of Rayleigh wave-based SAW sensors in sensing chemicals in a gaseous phase. In particular, we review the progress in general understanding of the SAW chemical sensing mechanism, optimization of the sensor characteristics, and the development of the sensors operational at different conditions. Based on previous publications, we suggest some appropriate sensing approaches for particular applications and identify new opportunities and needs for additional research in this area moving into the future.

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“…A delay line is simpler to design compared with the resonator that is why it is mainly use for practical applications. However, a delay line requires matching due to the insertion attenuation and is subjected to having oscillation frequency, but the resonators have smaller attenuations and do not require matching [52]. A resonator and a delay line could be either single or two-port.…”

Section: Principle Of Operationmentioning

confidence: 99%

“…However, Hea-Min Lee et al [60] designed SAW resonator gas sensor using lithium niobate for the detection of methane and hydrogen gas. Similarly, G. Fischerauer et al [52] also employed a SAW resonator for the detection of hydrocarbons. Due to the good results displayed by the use of saw devices for gas sensing in terms of high sensitivity, selectivity and good response times, A lot of researchers are working extensively so as to detect different gases using different configurations of SAWs and at different frequencies as presented in Table 1.…”

Section: Saw Based Gas Sensorsmentioning

confidence: 99%

Gas Sensors- A Review

Yunusa

Hamidon

Kaiser

et al. 2015

J. Environ. Nanotechnol.,

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In this paper a review of different technologies for gas sensors is presented. The different types of gas sensors technologies including catalytic gas sensor, electrochemical gas sensors, thermal conductivity gas sensor, optical gas sensor and acoustic gas sensor are discussed together with their principle of operation. The Surface Acoustic Wave Gas Sensor technology is discussed in greater detail. The advantages and disadvantages of each sensor technology are also highlighted. All these technologies have been used for several decades for the development of highly sensitive and responsive gas sensors for the detection of flammable and hazardous gases. However, for improved sensitivity and selectivity for these sensors, future trends and outlook for researchers are suggested in the conclusion of this article.

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Chemical sensors based on SAW resonators working at up to 1 GHz

Cited by 9 publications

References 6 publications

Template Imprinting Versus Porogen Imprinting of Small Molecules: A Review of Molecularly Imprinted Polymers in Gas Sensing

Template Imprinting Versus Porogen Imprinting of Small Molecules: A Review of Molecularly Imprinted Polymers in Gas Sensing

SAW Sensors for Chemical Vapors and Gases

Gas Sensors- A Review

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