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Detection of volatile organic compounds by weight-detectable sensors coated with metal-organic frameworks.

Yamagiwa H, Sato S, Fukawa T, Ikehara T, Maeda R, Mihara T, Kimura M - Sci Rep (2014)

Bottom Line: Detection of volatile organic compounds (VOCs) using weight-detectable quartz microbalance and silicon-based microcantilever sensors coated with crystalline metal-organic framework (MOF) thin films is described in this paper.The MOF layers worked as the effective concentrators of VOC gases, and the adsorption/desorption processes of the VOCs could be monitored by the frequency changes of weight-detectable sensors.Moreover, the MOF layers provided VOC sensing selectivity to the weight-detectable sensors through the size-selective adsorption of the VOCs within the regulated nanospace of the MOFs.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Textile Science and Technology, Shinshu University, Ueda 386-8567, Japan.

ABSTRACT
Detection of volatile organic compounds (VOCs) using weight-detectable quartz microbalance and silicon-based microcantilever sensors coated with crystalline metal-organic framework (MOF) thin films is described in this paper. The thin films of two MOFs were grown from COOH-terminated self-assembled monolayers onto the gold electrodes of sensor platforms. The MOF layers worked as the effective concentrators of VOC gases, and the adsorption/desorption processes of the VOCs could be monitored by the frequency changes of weight-detectable sensors. Moreover, the MOF layers provided VOC sensing selectivity to the weight-detectable sensors through the size-selective adsorption of the VOCs within the regulated nanospace of the MOFs.

No MeSH data available.


Related in: MedlinePlus

a) SEM images of Cu3(BTC)2 thin film grown from COOH-terminated SAM on gold electrode of microcantilever resonator. b) Frequency response of Cu3(BTC)2 film on the microcantilever resonator upon exposure to 100 ppm toluene, n-octane, acetone, and ethanol vapors.
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f6: a) SEM images of Cu3(BTC)2 thin film grown from COOH-terminated SAM on gold electrode of microcantilever resonator. b) Frequency response of Cu3(BTC)2 film on the microcantilever resonator upon exposure to 100 ppm toluene, n-octane, acetone, and ethanol vapors.

Mentions: Allendorf et al. demonstrated effective sensing of water and alcohols by using microcantilever modified with a MOF thin film22. The adsorption and desorption of the vapors in the MOFs on the cantilever produce strain changes at the interface between the MOF film and the cantilever surface. The resultant stress induces the bending of the cantilever and is detected by a piezoresistive sensor on the microcantilever. We also demonstrated the detection of VOCs by monitoring the oscillation frequency and resistance changes of silicon microcantilever sensor chips coated with TiO2 porous films covered with polythiophene layers11. The oscillation frequency changes were electrically detected by a set of four-bridged piezoresistive gauges on the sensor chip3536. The MOF thin films grown on the microcantilevers can be used to detect VOCs at ppm concentrations. Cu3(BTC)2 crystals were deposited onto the surface of the cantilevers (Figure 6a). A sensor chip with eight cantilevers coated with Cu3(BTC)2 was set into a temperature-controlled chamber, and the sensing properties were investigated by measuring the frequency changes when the film was exposed to VOC vapors in the chamber (Fig. S7). Figure 6b shows the responses of a Cu3(BTC)2-coated microcantilever sensor to 100 ppm VOC vapors operated at 60°C. The resonant frequency changed according to the adsorption and desorption processes of the VOC vapors on the surface of the Cu3(BTC)2 layer, and the Cu3(BTC)2 layer on the cantilever displayed an effective selectivity for the VOCs. The frequency rapidly decreased in response to the 100 ppm toluene vapor exposure, and the signal stayed constant at −ΔF = 360 Hz. The integration of MOF thin films with a microcantilever sensor platform can detect VOCs through the analyses of the oscillation frequency as a result of the adsorption/desorption of VOCs within the MOFs.


Detection of volatile organic compounds by weight-detectable sensors coated with metal-organic frameworks.

Yamagiwa H, Sato S, Fukawa T, Ikehara T, Maeda R, Mihara T, Kimura M - Sci Rep (2014)

a) SEM images of Cu3(BTC)2 thin film grown from COOH-terminated SAM on gold electrode of microcantilever resonator. b) Frequency response of Cu3(BTC)2 film on the microcantilever resonator upon exposure to 100 ppm toluene, n-octane, acetone, and ethanol vapors.
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Related In: Results  -  Collection

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f6: a) SEM images of Cu3(BTC)2 thin film grown from COOH-terminated SAM on gold electrode of microcantilever resonator. b) Frequency response of Cu3(BTC)2 film on the microcantilever resonator upon exposure to 100 ppm toluene, n-octane, acetone, and ethanol vapors.
Mentions: Allendorf et al. demonstrated effective sensing of water and alcohols by using microcantilever modified with a MOF thin film22. The adsorption and desorption of the vapors in the MOFs on the cantilever produce strain changes at the interface between the MOF film and the cantilever surface. The resultant stress induces the bending of the cantilever and is detected by a piezoresistive sensor on the microcantilever. We also demonstrated the detection of VOCs by monitoring the oscillation frequency and resistance changes of silicon microcantilever sensor chips coated with TiO2 porous films covered with polythiophene layers11. The oscillation frequency changes were electrically detected by a set of four-bridged piezoresistive gauges on the sensor chip3536. The MOF thin films grown on the microcantilevers can be used to detect VOCs at ppm concentrations. Cu3(BTC)2 crystals were deposited onto the surface of the cantilevers (Figure 6a). A sensor chip with eight cantilevers coated with Cu3(BTC)2 was set into a temperature-controlled chamber, and the sensing properties were investigated by measuring the frequency changes when the film was exposed to VOC vapors in the chamber (Fig. S7). Figure 6b shows the responses of a Cu3(BTC)2-coated microcantilever sensor to 100 ppm VOC vapors operated at 60°C. The resonant frequency changed according to the adsorption and desorption processes of the VOC vapors on the surface of the Cu3(BTC)2 layer, and the Cu3(BTC)2 layer on the cantilever displayed an effective selectivity for the VOCs. The frequency rapidly decreased in response to the 100 ppm toluene vapor exposure, and the signal stayed constant at −ΔF = 360 Hz. The integration of MOF thin films with a microcantilever sensor platform can detect VOCs through the analyses of the oscillation frequency as a result of the adsorption/desorption of VOCs within the MOFs.

Bottom Line: Detection of volatile organic compounds (VOCs) using weight-detectable quartz microbalance and silicon-based microcantilever sensors coated with crystalline metal-organic framework (MOF) thin films is described in this paper.The MOF layers worked as the effective concentrators of VOC gases, and the adsorption/desorption processes of the VOCs could be monitored by the frequency changes of weight-detectable sensors.Moreover, the MOF layers provided VOC sensing selectivity to the weight-detectable sensors through the size-selective adsorption of the VOCs within the regulated nanospace of the MOFs.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Textile Science and Technology, Shinshu University, Ueda 386-8567, Japan.

ABSTRACT
Detection of volatile organic compounds (VOCs) using weight-detectable quartz microbalance and silicon-based microcantilever sensors coated with crystalline metal-organic framework (MOF) thin films is described in this paper. The thin films of two MOFs were grown from COOH-terminated self-assembled monolayers onto the gold electrodes of sensor platforms. The MOF layers worked as the effective concentrators of VOC gases, and the adsorption/desorption processes of the VOCs could be monitored by the frequency changes of weight-detectable sensors. Moreover, the MOF layers provided VOC sensing selectivity to the weight-detectable sensors through the size-selective adsorption of the VOCs within the regulated nanospace of the MOFs.

No MeSH data available.


Related in: MedlinePlus