The Tuning of Optical Properties of Nanoscale MOFs-Based Thin Film through Post-Modification

Yin, Wenchang; Tao, Cheng‐an; Zou, Xiaorong; Wang, Fang; Tian-lian, QU; Wang, Jianfang

doi:10.3390/nano7090242

Cited by 26 publications

(28 citation statements)

References 37 publications

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“…Consequently, some efforts [17][18][19][20][21][22][23][24][25] have been made to explore the application of MOFs in optical thin films. Férey and coworkers [17] first described a simple route for the preparation of flexible porous iron carboxylate MIL-89 optical thin films using the dip-coating method.…”

Section: Introductionmentioning

confidence: 99%

Tuning optical properties of MOF-based thin films by changing the ligands of MOFs

et al. 2017

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The preparation and development of novel optical thin films are of great importance to functional optical and opto-electric components requiring a low refractive index. In this study, a typical metal-organic framework (MOF), MIL-101(Cr), is selected as the research model. The corresponding MOF nanoparticles are prepared by a hydrothermal method and the optical thin films are successfully prepared by spincoating. The optical properties of the corresponding MOF thin films are controlled by changing the type of functional groups on the benzene ring of the ligand (terephthalic acid) on MOFs. The functional groups are hydrogen atoms (H), electron donating groups (-NH 2, -OH) and electron withdrawing groups (-NO 2, -(NO 2 ) 2 or F 4 ), respectively. It is found that the effective refractive index (n eff ) of MOF thin films decreases along with the increasing voids among MOF nanoparticles. In addition, the extinction coefficient (k) increases with the addition of electron donating groups, and decreases with the addition of electron withdrawing groups. Among the MOFs used in this study, the n eff of NO 2 -MIL-101(Cr) containing electron withdrawing groups is as low as~1.2, and value of k is particularly low, which suggests its potential application in antireflective devices. In addition, the intrinsic refractive index (n dense ) of the dense MOF materials evaluated according to their porosity increases with the number of the functional groups, and the n dense of the two nitro-substituted MOFs is greater than that of the single nitro-substituted one, and the latter is bigger than that of hydroxyl-substituted one, which is close to that of amino-functionalized one. The diversity of ligands in MOFs makes them a promising new generation of optical materials.

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Section: Introductionmentioning

confidence: 99%

Tuning optical properties of MOF-based thin films by changing the ligands of MOFs

et al. 2017

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“…Our group [16,[22][23][24] successfully applied this method to construct many other MOF thin films, such as iron (III) terephthalate MIL-88B (MIL = Materials of Institut Lavoisier), aluminum terephthalate MIL-53, MIL-101(Cr), and their analogs. We [16] reported the first example of flexible MOF optical thin film fabricated by spin coating (Figure 1).…”

Section: Spin-coating Methodsmentioning

confidence: 99%

“…The OTF-SP film has the best flatness, while the OTF-DG has the worst roughness (Ra = 40.3 nm). The roughness of MOF thin films made of octahedral UiO-66 nanocrystals is generally higher than that of spherical MOF nanoparticles-based thin films [23,24,27]. For the dip-coated films, the more the depositions, the larger the roughness due to accumulation.…”

Section: Comparisonmentioning

confidence: 99%

“…Post-modification of ligands is also an effective means to change the optical constants of MOF optical films benefiting from abundant organic chemical reactions. Our group [24] reported the first example of successful regulation of optical films by post-modification of NH 2 -MIL-53(Al) (see Figure 3). Propionaldehyde, valeraldehyde, and heptaldehyde with different carbon chain lengths were chosen as the modifier.…”

Section: Tuning Through Post-modificationmentioning

confidence: 99%

“…Photographs of MOF optical thin film without modification (B), modified with propionaldehyde (C), pentanal (D), and heptanal (E). (F) The effective refractive index (n) of MOF optical thin films[24].…”

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Multilayer Thin Films - Versatile Applications for Materials Engineering

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Metal-organic frameworks (MOFs) are organic-inorganic hybrid materials with ordered pore structures assembled by metal centers and organic ligands through coordination bonds, but conventionally they are mostly in powder form. In recent years, metal-organic framework films have received increasing attention due to their potential applications in nanotechnology and nanodevices. The intrinsic ultrahigh porosity of MOFs may lead to a low refractive index of MOF materials. In addition, over 70,000 types of MOFs exist, and their properties can be tuned through the adoption of different metal motifs, organic ligands, or crystal morphologies. These characteristics make MOFs a potential new generation of optical thin film materials. In this chapter, the fabrication methods of MOF thin films, the optical properties of MOF optical thin films, and their application in optical sensors were described.

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Retikuläre Materialien sind von großem Interesse für Anwendungen in der Katalyse und Stofftrennung sowie der Gasspeicherung und gezielten Wirkstoffzufuhr. Diese offenporigen, ausgedehnten Gerüststrukturen können durch Kristallstrukturdesign auf spezifische Anwendungen zugeschnitten werden. Die Implementierung dieser Materialien in Anwendungsumgebungen erfordert jedoch eine Strukturierung über ihr Kristallgitter hinaus, um die Funktionalität auf molekularer Ebene effektiv mit der makroskopischen Welt zu verbinden. Um diese Barriere zu überwinden, werden als nächster Schritt Strategien für die Strukturierung retikulärer Materialien im Nano‐, Meso‐ und Volumenregime benötigt. In diesem Aufsatz geben wir einen Einblick in die jüngsten Fortschritte für die Herstellung von retikulären Materialien über allen Längenskalen, mit dem Fokus auf Selbstorganisationsstrategien und extern kontrollierten Ansätzen. Wir erwarten, dass bedeutende Forschungsfortschritte bei der Anwendung dieser beiden Ansätze in Verbindung mit retikulären Materialien erreicht werden und diese dabei helfen werden, wichtige Bedürfnisse der Gesellschaft zu bewältigen.

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The Tuning of Optical Properties of Nanoscale MOFs-Based Thin Film through Post-Modification

Cited by 26 publications

References 37 publications

Tuning optical properties of MOF-based thin films by changing the ligands of MOFs

Tuning optical properties of MOF-based thin films by changing the ligands of MOFs

Metal Organic Frameworks-Based Optical Thin Films

Mehr als nur ein Netzwerk: Strukturierung retikulärer Materialien im Nano‐, Meso‐ und Volumenbereich

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