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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 image and photograph of Zn4O(BDC)3 thin film grown from COOH-terminated SAM on gold electrode of QCM. b) Out-of-plane XRD data for Zn4O(BDC)3 film on QCM.
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f4: a) SEM image and photograph of Zn4O(BDC)3 thin film grown from COOH-terminated SAM on gold electrode of QCM. b) Out-of-plane XRD data for Zn4O(BDC)3 film on QCM.

Mentions: A thin film of Zn4O(BDC)3 was also grown from the COOH-terminated SAM onto the gold electrodes of the QCMs by using the crystallization solution. Highly-ordered thin Zn4O(BDC)3 films were formed on the SAMs as confirmed by SEM and X-ray diffraction pattern (Figure 4a and b). Zn4O(BDC)3 possesses larger pore size (0.8 nm) and aperture sizes (1.2 and 1.5 nm) than Cu3(BTC)2 due to a network of zinc oxide tetrahedrals connected with the BTC linkers in the highly-crystalline cubic structure (Fig. S6)25. Whereas the Cu3(BTC)2 layer showed the difference in the response speeds between the adsorption and desorption processes at 20°C, the reversible responses in both processes were observed in the Zn4O(BDC)3-coated QCMs at 20°C (Figure 5a). The sensitivity of the Zn4O(BDC)3-coated QCMs was slightly lower than that of the sensor coated with Cu3(BTC)2 as determined from the slopes of the concentration-dependent responses to the toluene vapor (Figure 5b). While the response sequence of the Zn4O(BDC)3 layer is the same as that of the Cu3(BTC)2 layer, the selectivity of the Zn4O(BTC)3 layer for the VOCs was lower compared to the Cu3(BTC)2 layer (Figure 5c). The larger pore and aperture sizes in Zn4O(BDC)3 induced a low molecular sieving effect for the selective sorption of the VOCs. When two MOF thin films were used as the sensing layers of the sensor arrays, the combination of different responses from the two MOF films enables for the detection of the VOC species as well as the determination of the VOC concentration.


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 image and photograph of Zn4O(BDC)3 thin film grown from COOH-terminated SAM on gold electrode of QCM. b) Out-of-plane XRD data for Zn4O(BDC)3 film on QCM.
© Copyright Policy - open-access
Related In: Results  -  Collection

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f4: a) SEM image and photograph of Zn4O(BDC)3 thin film grown from COOH-terminated SAM on gold electrode of QCM. b) Out-of-plane XRD data for Zn4O(BDC)3 film on QCM.
Mentions: A thin film of Zn4O(BDC)3 was also grown from the COOH-terminated SAM onto the gold electrodes of the QCMs by using the crystallization solution. Highly-ordered thin Zn4O(BDC)3 films were formed on the SAMs as confirmed by SEM and X-ray diffraction pattern (Figure 4a and b). Zn4O(BDC)3 possesses larger pore size (0.8 nm) and aperture sizes (1.2 and 1.5 nm) than Cu3(BTC)2 due to a network of zinc oxide tetrahedrals connected with the BTC linkers in the highly-crystalline cubic structure (Fig. S6)25. Whereas the Cu3(BTC)2 layer showed the difference in the response speeds between the adsorption and desorption processes at 20°C, the reversible responses in both processes were observed in the Zn4O(BDC)3-coated QCMs at 20°C (Figure 5a). The sensitivity of the Zn4O(BDC)3-coated QCMs was slightly lower than that of the sensor coated with Cu3(BTC)2 as determined from the slopes of the concentration-dependent responses to the toluene vapor (Figure 5b). While the response sequence of the Zn4O(BDC)3 layer is the same as that of the Cu3(BTC)2 layer, the selectivity of the Zn4O(BTC)3 layer for the VOCs was lower compared to the Cu3(BTC)2 layer (Figure 5c). The larger pore and aperture sizes in Zn4O(BDC)3 induced a low molecular sieving effect for the selective sorption of the VOCs. When two MOF thin films were used as the sensing layers of the sensor arrays, the combination of different responses from the two MOF films enables for the detection of the VOC species as well as the determination of the VOC concentration.

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