Fullerene/liquid crystal mixtures as QMB- and SAW-coatings - detection of diesel- and solvent-vapours

Dickert, Franz L.; Zenkel, M. E.; Bulst, Wolf-Eckhart; Fischerauer, Gerhard; Knauer, U.

doi:10.1007/s002160050105

Cited by 20 publications

(12 citation statements)

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“…228,229 The proposed mechanism of this sensitivity enhancement involved a combination of enhanced chelation by the cryptand/crown ether as well as enhanced reactivity of the C 60 at the cryptand/crown ether binding site. 228,229 Another approach to generating supramolecular host compounds for vapor sensing with fullerenes involved liquid crystals 230 where rigid linear (thermotropic liquid crystals) and globular (fullerenes) compounds formed a 1:1 stoichiometry sensing film, disturbing the close packing of both species and thus, forming cavities and diffusion channels.…”

Section: Integration Of Sensing Materials With Transducersmentioning

confidence: 99%

Materials and Transducers Toward Selective Wireless Gas Sensing

et al. 2011

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Introduction 7315 1.1. Diversity of Monitoring Needs of Volatiles 7315 1.2. Chemical Interferences As the Key Noise Parameter for Wireless Sensors 7316 1.3. Goals and Scope of This Review 7317 1.4. Topics That Are Out of Scope of This Review 7317 2. Anatomy of Wireless Gas Sensors 7317 2.1. Active and Passive Wireless Sensors 7318 2.2. Transducers for Wireless Passive Sensors 7319 2.3. RFID Sensors 7320 2.4. Key Performance Factors of Wireless Sensors 7320 2.5. Summary of Specific Requirements for Wireless Gas Sensors 7321 3. Need for Transducers with Multiple Response Mechanisms 7321 3.1. Limitations of Sensor Arrays for Tethered and Wireless Gas Sensing 7322 3.2. Data Processing 7322 3.3. Multivariate Sensing 7323 4. Integration of Sensing Materials with Transducers 7323 6.3. System Approach for Development of Wireless Gas Sensors 7345 6.4. Path Forward 7345 Author Information 7346 Biographies 7346 Acknowledgment 7347 References 7347

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Section: Integration Of Sensing Materials With Transducersmentioning

confidence: 99%

Materials and Transducers Toward Selective Wireless Gas Sensing

et al. 2011

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“…Fig. 7 shows the response of a 434-MHz SAW quartz twoport resonator coated with a mixture of fullerenes and liquid crystals (film thickness h = 30 nm) when subjected to a diesel vapor up-down step corresponding to 1% of the vapor pressure at room temperature [10]. A static sensitivity of K = −111 Hz/% (frequency change per analyte concentration measured in fractions of the vapor pressure at room temperature) and a diffusion coefficient of D = 1.5 × 10 −17 m 2 /s were used in Eq.…”

Section: Experimental Verificationmentioning

confidence: 99%

An analytic model of the dynamic response of mass-sensitive chemical sensors

Fischerauer¹,

Dickert²

2007

Sensors and Actuators B: Chemical

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“…Additionally, both single sensors and arrays have been reported [for some fundamental aspects of the layer design for sorption sensor arrays, see Lau et al (139) ]. Dickert et al (140) introduced QMB and SAW coatings based on mixtures of linear and globular molecules for the detection of diesel vapors. A sensor array based on six QMB devices with a resonance frequency of 10 MHz for the detection of organic vapors was described by Hierlemann et al (141) The sensors were coated with differently substituted polysiloxanes, widely applied as stationary phases in GC.…”

Section: Mass-sensitive Sensorsmentioning

confidence: 99%

Solid‐state Sensors for Field Measurements of Gases and Vapors

Mujahid

Lieberzeit

Dickert

2000

Encyclopedia of Analytical Chemistry

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Remote and infield analysis is developing into a crucial aspect of modern analytical chemistry. Chemical sensors, which are small measuring devices consisting of a recognition layer, a transducer, and the measurement electronics, have proven to be highly suitable tools for this purpose. Although usually they are constructed for the detection of very limited amounts of chemical compounds and often do not reach the detection limits of modern analytical instruments, they show very desirable advantages: the systems are easy to operate, mostly rugged, small, of good value, and can be manufactured by established technological methods. Owing to their size and ruggedness, they can even be operated in harsh environments and often can be constructed to be suitable for remote measurements, where several sensors are interrogated by a central analytical site. Devices being used include optical fibers, field‐effect transistors (FETs), electrochemical cells (be they potentiometric or amperometric), and mass‐sensitive components of all kinds. The chemically sensitive coatings range from bare transducer surfaces to dyes reacting with analyte or sterically specific binding sites (e.g. host–guest complexes). A seeming drawback is the fact that only few sensors react specifically toward one defined component but normally show a sensitivity pattern toward chemically related substances. By using an array of several components followed by modern methods of data evaluation (such as neural networks), a group of analytes can be detected and characterized simultaneously. This article introduces device and recognition layer principles as well as covering field sensors published during the last one and a half decades based on all the different kinds of transducers and sensor layers. Some of the devices (such as the lambda probe) are already marketed, others are developed to a stage where field measurements have already been carried out, but which are not market‐ready.

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Fullerene/liquid crystal mixtures as QMB- and SAW-coatings - detection of diesel- and solvent-vapours

Cited by 20 publications

References 1 publication

Materials and Transducers Toward Selective Wireless Gas Sensing

Materials and Transducers Toward Selective Wireless Gas Sensing

An analytic model of the dynamic response of mass-sensitive chemical sensors

Solid‐state Sensors for Field Measurements of Gases and Vapors

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