J. Mater. Chem. A

2014

DOI: 10.1039/c4ta01916d

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Fabrication of an NH₂-MIL-88B photonic film for naked-eye sensing of organic vapors

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Introduction2

Fabrication Of Mof-based Optical Thin Films1

Preparation Of Tio 2 Sol1

Selective Response Of 1dpcs Toward Organic Vapors1

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Cited by 66 publications

(67 citation statements)

References 35 publications

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“…Previously, we showed that the thickness of the thin film could be adjusted by altering the concentration of the MOF suspension, the spin-coating rotation speed and spin-coating times [23,24], while the optical parameters kept constant. To get the thin film with moderate thickness (<1000 nm), in this study, these three factors were controlled to be 3.0-4.0 wt.%, 3000 rpm and only once.…”

Section: Fabrication Of Mof-based Optical Thin Filmsmentioning

confidence: 99%

“…Ranft et al [22] fabricated tandem MOF-based photonic crystals for enhanced analyte-specific optical detection by spin-coating. Our group [23,24] also fabricated flexible MOF-based photonic films for sensing. These studies focused on the reversible responses of MOFs on an external stimulus.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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

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et al. 2017

Sci. China Mater.

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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.

“…Previously, we showed that the thickness of the thin film could be adjusted by altering the concentration of the MOF suspension, the spin-coating rotation speed and spin-coating times [23,24], while the optical parameters kept constant. To get the thin film with moderate thickness (<1000 nm), in this study, these three factors were controlled to be 3.0-4.0 wt.%, 3000 rpm and only once.…”

Section: Fabrication Of Mof-based Optical Thin Filmsmentioning

confidence: 99%

“…Ranft et al [22] fabricated tandem MOF-based photonic crystals for enhanced analyte-specific optical detection by spin-coating. Our group [23,24] also fabricated flexible MOF-based photonic films for sensing. These studies focused on the reversible responses of MOFs on an external stimulus.…”

Section: Introductionmentioning

confidence: 99%

“…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%

See 1 more Smart Citation

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

¹

,

²

,

³

et al. 2017

Sci. China Mater.

Self Cite

View full text Add to dashboard Cite

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.

“…43,44 An aqueous solution of FeCl 3 $6H 2 O was poured into an F127 aqueous solution. 43,44 An aqueous solution of FeCl 3 $6H 2 O was poured into an F127 aqueous solution.…”

Section: Preparation Of Tio 2 Solmentioning

confidence: 99%

“…4b). 44 Furthermore, the optical response of 1DPC toward a mixture of vapors was investigated to demonstrate its high chemical selectivity. 4c) Fig.…”

Section: Selective Response Of 1dpcs Toward Organic Vaporsmentioning

confidence: 99%

Flexible metal–organic framework-based one-dimensional photonic crystals

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et al. 2015

J. Mater. Chem. C

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A flexible metal-organic framework (MOF)-based one-dimensional photonic crystal (1DPC) was fabricated by a spin-coating method. The flexible MOF, NH 2 -MIL-88B (MIL ¼ Materials from Institute Lavoisier), was selected and implanted as the intrinsic functional layer of 1DPCs because of its selective breathing behavior upon exposure to various guests. TiO 2 nanoparticles were used as another component to ensure a high refractive index contrast. The optical properties of the 1DPCs were tailored by varying the number of bilayers, incident angles, and physical thickness of the individual slabs. The fabricated 1DPCs showed a selective response toward various organic vapors as a result of the selective breathing behavior of the NH 2 -MIL-88B layer. Selective quantitative measurements of the ethanol concentrationwere achieved when the 1DPC was exposed to the vapors of an ethanol and water mixture. The fabricated 1DPCs exhibited high long-term, thermal, and mechanical stability, which are beneficial for practical applications. 84574241 † Electronic supplementary information (ESI) available: Characterization of NH 2 -MIL-88B and TiO 2 nanoparticles, optical responses of 1DPC upon various organic vapors, photographs of 1DPC aer high thermal, long term and ultrasonic treatments. See

Metal–Organic Frameworks‐Based Fabry−Pérot Cavity Encapsulated TiO₂ Nanoparticles for Selective Chemical Sensing

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et al. 2021

Adv Funct Materials

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This paper reports a Fabry−Pérot (F–P) cavity constructed by metal–organic frameworks (MOFs) encapsulated with TiO2 nanoparticles that can achieve selective sensing of chemicals. The MOFs‐based F–P cavity is fabricated by sequentially spray‐coating TiO2 in HKUST‐1 thin films through a layer‐by‐layer deposition strategy. The bandwidth of the cavity is tuned over a broad range by adjusting the thickness and refractive index of the HKUST‐1⊃TiO2 thin films with controllable TiO2 size and concentration. Selective sensing of chemical vapors is demonstrated on the HKUST‐1⊃TiO2 cavities which are attributed to enhanced interaction between hydroxyl groups on the surface of TiO2 and the specific oxygen‐containing analytes. In addition, molecule dynamics simulation and infrared absorption spectrum characterization are conducted to elucidate the mechanism of enhanced sensing properties. Homogeneous encapsulation of functional guest pieces with smaller sizes in MOF films contributes to specific physical–chemical properties that benefit their device applications in optical communication and chemical sensing.

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