Effect of pH on the properties of palmitic acid LB films for gas sensors

Kang, Kyungsu; Kim, J.M; Kim, D.K; Jung, Sang-Burm; Chang, Jeong-Soo; Kwon, Young−Soo

doi:10.1016/s0925-4005(01)00745-6

Cited by 11 publications

(8 citation statements)

References 7 publications

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“…According to Sauerbrey Equation (1) [44]:

Δ f = - f_{0}^{2} Δ m / NS ρ

where Δf is the frequency change, f 0 is the frequency of the quartz plate, Δm is the weight of applied coating, N is the unique constant of quartz crystal, S is the surface area of coated electrode, and ρ is the density of the quartz plate. QCM technology has been widely applied to the area of environmental monitoring, gas sensors, pressure sensors, and chemical sensors [45]. The sensitivity of QCM gas sensors is highly increased in the presence of a coating that interacts with the target gas [46].…”

Section: Sensorsmentioning

confidence: 99%

Gas Sensors Based on Electrospun Nanofibers

Ding

Wang

et al. 2009

Sensors

386

216

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Nanofibers fabricated via electrospinning have specific surface approximately one to two orders of the magnitude larger than flat films, making them excellent candidates for potential applications in sensors. This review is an attempt to give an overview on gas sensors using electrospun nanofibers comprising polyelectrolytes, conducting polymer composites, and semiconductors based on various sensing techniques such as acoustic wave, resistive, photoelectric, and optical techniques. The results of sensing experiments indicate that the nanofiber-based sensors showed much higher sensitivity and quicker responses to target gases, compared with sensors based on flat films.

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“…According to Sauerbrey Equation (1) [44]:

Δ f = - f_{0}^{2} Δ m / NS ρ

Section: Sensorsmentioning

confidence: 99%

Gas Sensors Based on Electrospun Nanofibers

Ding

Wang

et al. 2009

Sensors

386

216

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“…It is well known that the sensitivity of QCM sensors is strongly related with the morphology of coating materials [8]. The comparison between the FM-QCM and CF-QCM sensors for detection of ammonia was made.…”

Section: Comparison Between Fm-qcm and Cf-qcm Sensorsmentioning

confidence: 99%

“…The ultrahigh sensitivity of QCM sensors can accurately detect mass uptake on the order of nanograms. The QCM technology has been enormously applied to the area of environment monitoring, gas sensor, pressure sensor, and chemical sensor [8]. The sensitivity of QCM gas sensors is highly increased in the presence of a coating that interacts with the target gas [9].…”

Section: Introductionmentioning

confidence: 99%

Electrospun fibrous polyacrylic acid membrane-based gas sensors

Ding

Yamazaki

Shiratori

2005

Sensors and Actuators B: Chemical

135

108

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“…A special difficulty in creating sensitive coatings for the discrimination of hydrocarbon vapors lies in the great chemical similarity of these compounds and their lack of functional groups. Thus, coating selectivity is achieved mostly by the complementary nature of many weak interactions of the analyte with hydrophobic cavities of the coating material.Films of hydrophobic polymers, fatty acids, and other materials sensitive to hydrocarbon vapors are usually used for coating 5]. As a consequence of the low specific surface of such films, their sensitivity mainly results from bulk adsorption, i.e., dissolution of the hydrocarbons in the polymer.…”

mentioning

confidence: 99%

“…Films of hydrophobic polymers, fatty acids, and other materials sensitive to hydrocarbon vapors are usually used for coating PQR-receptors [4,5]. As a consequence of the low specific surface of such films, their sensitivity mainly results from bulk adsorption, i.e., dissolution of the hydrocarbons in the polymer.…”

mentioning

confidence: 99%

New coating materials for hydrocarbon discrimination using a multisensor system and gas chromatography

et al. 2005

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Cobalt(II), nickel (II), and copper(II) stearates, their complexes with octadecylamine, and carbon nanotubes were used as coatings on chemical piezoquartz sensors for hydrocarbon vapors. The rapid and reliable identification of hydrocarbons and other volatile compounds is possible by combining an electric nose flow cell with eight piezoquartz sensors and an LKhM-80 gas chromatograph equipped with a short column (nose-chrom device).The detection and identification of hydrocarbon vapors is important in the monitoring of petroleum industry pollutants and operational monitoring of the quality of motor fuels. The identification of volatile organic compounds (analytes) differing in their chemical nature may be achieved to some extent using an electronic nose multisensor system [1]. Piezoquartz resonators (PQR) with chemical coatings (PQR-receptors), which differ only partially in their selectivity relative to the various analytes, may be used in such systems. The set of responses (change in frequency, -Df) obtained from the different receptors of a given system in the presence of analyte vapors (termed the sensor image of the analyte for a given system) is characteristic only for a given analyte and may serve for its detection and identification. The reliability and accuracy of the analysis improve with greater sensitivity and discrimination (i.e., the difference between the selectivity parameters for the sensor coatings in the system) and with greater chemical differences between the compounds analyzed. Optimization of the number of sensors in the system, selection of the chemical coating for each sensor relative to the composition of the vapors to be analyzed, and taking account of the effect of temperature and other factors on the analysis results is a rather complicated mathematical problem [2,3]. The unequivocal solution of this problem becomes more difficult with decreasing discrimination of the system. A special difficulty in creating sensitive coatings for the discrimination of hydrocarbon vapors lies in the great chemical similarity of these compounds and their lack of functional groups. Thus, coating selectivity is achieved mostly by the complementary nature of many weak interactions of the analyte with hydrophobic cavities of the coating material.Films of hydrophobic polymers, fatty acids, and other materials sensitive to hydrocarbon vapors are usually used for coating 5]. As a consequence of the low specific surface of such films, their sensitivity mainly results from bulk adsorption, i.e., dissolution of the hydrocarbons in the polymer. Rather high specific adsorption capacity as well as the 0040-5760/05/4106-0389

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Effect of pH on the properties of palmitic acid LB films for gas sensors

Cited by 11 publications

References 7 publications

Gas Sensors Based on Electrospun Nanofibers

Gas Sensors Based on Electrospun Nanofibers

Electrospun fibrous polyacrylic acid membrane-based gas sensors

New coating materials for hydrocarbon discrimination using a multisensor system and gas chromatography

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