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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 Cu3(BTC)2 thin film grown from COOH-terminated SAM on gold electrode of QCM. b) Out-of-plane XRD data for Cu3(BTC)2 film on QCM.
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f1: a) SEM image and photograph of Cu3(BTC)2 thin film grown from COOH-terminated SAM on gold electrode of QCM. b) Out-of-plane XRD data for Cu3(BTC)2 film on QCM.

Mentions: The gold electrodes of 9 MHz AT-cut QCMs were functionalized with the SAM monolayer with COOH-terminates. After the formation of the SAM, the QCMs were placed horizontally onto a Teflon plate with a circular window and the gold electrodes were exposed to a clear crystallization solution of Cu3(BTC)2. While no Cu3(BTC)2 crystals were obtained on the QCMs without the SAM modification, the dense layer of micrometer-sized Cu3(BTC)2 crystals on the COOH-terminated SAM was formed with a uniform orientation (Figure 1a). The FT-IR-RAS spectrum of the Cu3(BTC)2 crystal on the QCM displayed two peaks at 1390 and 1600 cm−1, indicating the formation of coordination bonds between the carboxyl groups in the BTC ligand and copper ions27 (Fig. S1). A thermo-gravimetric analysis (TGA) of the crystals showed the weight losses of −18.5% from 20 to 120°C (−H2O) and −28.4% from 250 to 400°C (−CO2 and others)24 (Fig. S2). The TGA profile is almost coincidence to the reported profile of Cu3(BTC)2. The x-ray diffraction pattern of the thin Cu3(BTC)2 films on the QCMs indicated only two (200) and (400) reflections, implying the highly oriented crystalline growth along the [100] direction on the COOH-terminated SAM layer (Figure 1b, Fig. S3)27. The average film thickness of Cu3(BTC)2 on the QCMs was 500 ± 50 nm estimated from the frequency decrease of the QCMs after the deposition of the crystals, the area of electrode, and the reported density of Cu3(BTC)2. From these results, highly ordered thin Cu3(BTC)2 films were formed on the QCM sensors modified with the COOH-terminated SAMs.


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 Cu3(BTC)2 thin film grown from COOH-terminated SAM on gold electrode of QCM. b) Out-of-plane XRD data for Cu3(BTC)2 film on QCM.
© Copyright Policy - open-access
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4150105&req=5

f1: a) SEM image and photograph of Cu3(BTC)2 thin film grown from COOH-terminated SAM on gold electrode of QCM. b) Out-of-plane XRD data for Cu3(BTC)2 film on QCM.
Mentions: The gold electrodes of 9 MHz AT-cut QCMs were functionalized with the SAM monolayer with COOH-terminates. After the formation of the SAM, the QCMs were placed horizontally onto a Teflon plate with a circular window and the gold electrodes were exposed to a clear crystallization solution of Cu3(BTC)2. While no Cu3(BTC)2 crystals were obtained on the QCMs without the SAM modification, the dense layer of micrometer-sized Cu3(BTC)2 crystals on the COOH-terminated SAM was formed with a uniform orientation (Figure 1a). The FT-IR-RAS spectrum of the Cu3(BTC)2 crystal on the QCM displayed two peaks at 1390 and 1600 cm−1, indicating the formation of coordination bonds between the carboxyl groups in the BTC ligand and copper ions27 (Fig. S1). A thermo-gravimetric analysis (TGA) of the crystals showed the weight losses of −18.5% from 20 to 120°C (−H2O) and −28.4% from 250 to 400°C (−CO2 and others)24 (Fig. S2). The TGA profile is almost coincidence to the reported profile of Cu3(BTC)2. The x-ray diffraction pattern of the thin Cu3(BTC)2 films on the QCMs indicated only two (200) and (400) reflections, implying the highly oriented crystalline growth along the [100] direction on the COOH-terminated SAM layer (Figure 1b, Fig. S3)27. The average film thickness of Cu3(BTC)2 on the QCMs was 500 ± 50 nm estimated from the frequency decrease of the QCMs after the deposition of the crystals, the area of electrode, and the reported density of Cu3(BTC)2. From these results, highly ordered thin Cu3(BTC)2 films were formed on the QCM sensors modified with the COOH-terminated SAMs.

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