Mass-Sensitive Detection of Solvent Vapors. Mechanistic Studies on Host−Guest Sensor Principles by FT-IR Spectroscopy and BET Adsorption Analysis

Dickert, Franz L.; Haunschild, A.; Kuschow, V.; Reif, and M.; Stathopulos, Helen

doi:10.1021/ac950639z

Cited by 39 publications

(35 citation statements)

References 33 publications

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“…paracyclophanes [40]. We emphasize that, in the present context, the term molecular recognition does not imply any particular minimum value of the partition coefficient, nor even a minimum discrimination ratio relative to nonspecifically detected species.…”

Section: Results a N D Discussion Tsmr Sorption Isotherms: Thermodynamentioning

confidence: 68%

Effective Use of Molecular Recognition in Gas Sensing: Results from Acoustic Wave and in Situ FT-IR Measurements

et al. 1999

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Section: Results a N D Discussion Tsmr Sorption Isotherms: Thermodynamentioning

confidence: 68%

Effective Use of Molecular Recognition in Gas Sensing: Results from Acoustic Wave and in Situ FT-IR Measurements

et al. 1999

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“…Since the biased LEC is a charged electrochemical cell [1,3,4], current measurements are undesirable as they will provide a low resistance path which will discharge the cell and "de-dope" the semiconducting polymer. Even under open circuit conditions, the cell can discharge internally through the partially doped conjugated polymer.…”

mentioning

confidence: 99%

“…Cao, C. Y. Yang, G. Yu, A. J. Heeger, Appt. Phys.Lett., 1996, 68 3218 [4]. G. Yu, Y. Yang, Y. Cao, C. Zhang, A. J. Heeger, Chem.…”

mentioning

confidence: 99%

Molecularly imprinted polymers for optochemical sensors

Dickert

Thierer

1996

Advanced Materials

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ADVANCED MATERIALSCommunications tage. EL originates from the compensated region where the built-in electric field is a maximum. Note, however, that when the external bias is applied under steady state conditions, the external field is opposite to the built-in field so that near threshold, the net internal field is small during operation. The observed decrease in the PL within the junction is particularly interesting since external quantum efficiencies of LECs are comparable with those of polymer LEDs fabricated from the same semiconducting polymer.[lA1 This suggests that the quantum efficiency of the EL is a larger fraction of the PL than in conventional polymer light-emitting diodes.We emphasize once again that the results presented here were obtained with the LEC in the surface cell configuration with relatively widely spaced electrodes. For sandwich cells, the width of the junction must be less than the sub-micron thickness of the polymer layer, implying that the boundary conditions play a more critical role. ExperimentalSurface cell LECs were prepared with pairs of gold strips (5 mm long, 2 mm wide) as the contact electrodes, separated by a (approximately) 20 pm gap. Five pairs were fabricated onto an 1.5 x 1.5 cm2 glass substrate by vapor deposition through a shadow mask. A layer of chromium was

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“…37 For the physical adsorption phenomena, the Brunauer-Emmet-Teller (BET) model was suitable to describe the multiple site adsorption. 40 The number of adsorbed molecules, n m value, was obtained from the intercept of the slope. 39 The surface energy data were calculated using the frequency response for both the analytes.…”

Section: Sensor Responsementioning

confidence: 99%

Tracking the chemical surface properties of racemic thalidomide and its enantiomers using a biomimetic functional surface on a quartz crystal microbalance

Suksuwan

Lomlim

Dickert

et al. 2015

J of Applied Polymer Sci

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We present details of the chemical surface properties of the molecularly imprinted polymer (MIP) on quartz crystal microbalance (QCM) for the tracking of the chiral recognition of racemic thalidomide and its (R)-enantiomer. We investigate the assembly and specific patterns of enantiomer and racemate of thalidomide on the poly(urethane) coating consisted of the syntheticestrogen bisphenol A (BPA) on a QCM electrode by infrared spectroscopy and atomic force microscopy (AFM), which confirmed the surface properties of these materials. The BPA present on the surface of the coating layer revealed a positive frequency response for the racemic thalidomide that eventually appeared. This involved a negative shift of 80 Hz for a 200 mg mL 21 racemic thalidomide, and in all cases, a negative shift of 200 Hz for a 100 mg mL 21 (R)-thalidomide. The affinity constants (K a ) for the racemate adsorbed onto the polymer layer imprinted with (R)-thalidomide were lower than those for the (R)-thalidomide. Also, the binding energy involved a different binding process of the chiral forms and indicated that the two enantiomers had a twofold difference in their binding energies. Thus, the advantage of the use of BPA is proven that will function as hydrogen-bond donors in the enantioselective recognition site of the MIP. The data of functional analysis demonstrated that the biomimetic detection using molecular imprinting turn out to a study of the pharmaceutical effects of a pharmaceutically chiral compound on natural receptor functions. This approach is highly useful that highlight an enhanced understanding of the mechanism of stereochemistry required for biological controls.

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Mass-Sensitive Detection of Solvent Vapors. Mechanistic Studies on Host−Guest Sensor Principles by FT-IR Spectroscopy and BET Adsorption Analysis

Cited by 39 publications

References 33 publications

Effective Use of Molecular Recognition in Gas Sensing: Results from Acoustic Wave and in Situ FT-IR Measurements

Effective Use of Molecular Recognition in Gas Sensing: Results from Acoustic Wave and in Situ FT-IR Measurements

Molecularly imprinted polymers for optochemical sensors

Tracking the chemical surface properties of racemic thalidomide and its enantiomers using a biomimetic functional surface on a quartz crystal microbalance

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