&lt;title&gt;Self-organized polymers as sensitive coatings&lt;/title&gt;

Dickert, Franz L.; Achatz, Paul; Bulst, Wolf-Eckhart; Greibl, Wolfgang; Hayden, Oliver; Liu, Ping; Sikorski, Renatus; Wolff, U.

doi:10.1117/12.370278

Cited by 3 publications

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“…Calix[n]arenes and their derivatives are an excellent material to organize as a monolayer on the water surface and to prepare Langmuir-Blodgett (LB) thin films [21,22]. These films have possible applications especially in the field of the environment protection such as detection of NO 2 [23], ozone [24], NH 3 or HCl gases [25], various ions [26] and various solvent vapors [20].…”

Section: Introductionmentioning

confidence: 99%

“…Cage compounds such as tert-butyl-calix[n]arenes often show highly pre-organized structures with highly symmetrical cavities suitable for host-guest interactions. The resultant chemical or physical changes can be detected using a very sensitive capacitive method for the detection of solvent vapors down to a concentration of a few ppm [20]. They are also capable of binding certain ions or small molecules within their cavities and for exhibiting high porosity to other species.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Langmuir–Blodgett films of a calix[8]arene and sensing properties towards volatile organic vapors

Çapan

Özbek

Göktaş

et al. 2010

Sensors and Actuators B: Chemical

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a b s t r a c tWithin this article, we report the characterization and organic vapor sensing properties of Langmuir-Blodgett (LB) thin films of calix[8]arenes. Surface pressure-area isotherms show that very stable monolayers are formed at the air-water interface. The LB film could be deposited onto different substrates which allowed the films to be characterized by UV, quartz crystal microbalance (QCM), surface plasmon resonance (SPR) and atomic force microscopy (AFM). The results indicate that good quality, uniform LB films can be prepared with transfer ratios of over 0.95. QCM results showed that the deposited mass of calix[8]arene monolayer onto a quartz crystal decreased from 693 to 204 ng as the number of layers is increased. AFM studies showed a smooth, and void free surface morphology with a rms value of 1.202 nm. The sensing abilities of this LB film towards the development of room temperature organic vapor sensing devices are also studied. Responses of the LB films to various vapors are fast, large, and reversible. It was found that the obtained LB film is significantly more sensitive to chloroform than other vapors. It can be concluded that this molecule could have a potential application in the research area of room temperature vapor sensing devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Langmuir–Blodgett films of a calix[8]arene and sensing properties towards volatile organic vapors

Çapan

Özbek

Göktaş

et al. 2010

Sensors and Actuators B: Chemical

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“…Capacitive humidity sensors are commercially available from, e.g., Sensirion, Vaisala, and Humirel . More recent applications of capacitive sensors include the detection of organic volatiles in the gas phase using polymeric layers, − ,− or liquid crystals …”

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confidence: 99%

Transient Signal Analysis Using Complementary Metal Oxide Semiconductor Capacitive Chemical Microsensors

2005

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This work explores the possibility to discriminate analytes based on their nonequilibrium signals in polymer-coated capacitive chemical microsensors. The analyte uptake in the chemically sensitive polymer layers of 3-7-microm thickness has been analyzed using a diffusion model and the dynamic sensor response data. The shapes of the response profiles have been calculated analytically. Despite the simplifications in the model, the observed transient signal profiles could be described accurately. Comparison of the measured diffusion coefficients (on the order of 10(-12) m2/s) with literature values measured at similar concentration levels showed good agreement. Concentration-independent diffusion coefficients for several analyte/polymer combinations (poly(etherurethane)/all analytes; poly(epichlorohydrin)/alcohols) as well as slightly concentration-dependent diffusion coefficients (poly(epichlorohydrin)/toluene or ethyl cellulose/toluene) have been found in the investigated concentration range of tens to hundreds of pascals gas-phase partial pressure. The diffusion times of water and the first aliphatic monohydric alcohols in the polymers are strongly correlated to their molecular size. The discrimination of these substances based on dynamic sensor data of a single sensor could be demonstrated. In particular, the analysis of mixtures of analytes with similar chemical behavior (water/ethanol or methanol/ethanol) by means of analyzing the response profile of single-exposure steps or by applying a series of decreasingly long alternating target gas exposure and carrier gas exposure steps has been performed.

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Configurable electrodes for capacitive-type sensors and chemical sensors

Kummer

Hierlemann

2006

IEEE Sensors J.

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<title>Self-organized polymers as sensitive coatings</title>

Cited by 3 publications

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Characterization of Langmuir–Blodgett films of a calix[8]arene and sensing properties towards volatile organic vapors

Characterization of Langmuir–Blodgett films of a calix[8]arene and sensing properties towards volatile organic vapors

Transient Signal Analysis Using Complementary Metal Oxide Semiconductor Capacitive Chemical Microsensors

Configurable electrodes for capacitive-type sensors and chemical sensors

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