The effect of synthesis temperature on the particle size of nano-ZIF-8

Tsai, Chih‐Wei; Langner, Ernst H.G.

doi:10.1016/j.micromeso.2015.08.041

Cited by 130 publications

(69 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported previously, when the residual solvent me- 1 thanol was removed quickly by vacuum and/or heating, the gel transformed to white/opaque solid blocks, which can be easily crashed to form white powders ( Fig. S2) [20][21][22]. Interestingly, when the solvent was ethanol, the gel transformed to small transparent granules after the vacuum/heating treatment (Fig.…”

supporting

confidence: 66%

Room-temperature sintered metal-organic framework nanocrystals: A new type of optical ceramics

Zhou

Wang

et al. 2018

Sci. China Mater.

View full text Add to dashboard Cite

Ceramic is a rigid material consisting of an infinite threedimensional network of sintered non-oriented inorganic, non-metallic crystalline grains, which are generally nontransparent. If the inner light scatter is eliminated, ceramics can become transparent or optical ceramics [1,2]. With great potentials in optical windows, sensors and lasers, optical ceramics have received great attentions since 1950s [1]. As the gain medium of solid-state lasers, optical ceramics can combine the advantages of large size, high transparency, high mechanical and thermal stabilities, and ease for dispersing the luminous atoms and groups [3]. For comparison, single-crystal gain mediums can suffer high power density but are difficult to grow into large size, while glasses and polymers have reversed characteristics.To make ceramics transparent, the inner pore and impurity should be minimized to zero, which requires highly pure, nanosized, and very uniform crystallite precursors as well as complicated fusing technology ( Fig. 1) [4,5]. The cubic crystal symmetries (absence of the birefringence which causes extremely high scattering losses) are generally required for the crystallites of optical ceramics, meaning that only a few inorganic materials can be used. Besides, ceramics sintering usually operates above 1000 o C, which excludes organic and organic-inorganic hybrid materials [1].Porous coordination polymers (PCPs) or metal-organic frameworks (MOFs) are crystalline materials consisting of metal ions and organic ligands, which have captured widespread attentions for adsorption, catalysis, sensing, optics [6] and also laser gain mediums [7][8][9][10][11]. As can be seen in membranes and photonic crystals [12,13], MOF nanocrystals may merge to form seamless microscopic blocks under mild conditions [14][15][16]. Nevertheless, macroscopic and optical transparent blocks of MOF nanocrystals/microcrystals are still unknown so far. Just like single crystals and optical ceramics, increasing the block size with high optical quality is always a great challenge for many materials. Here, we show that by simply slowing down the solvent evaporation rate, nanocrystals of the prototypical MOF SOD-[Zn(mim) 2 ] (MAF-4/ZIF-8 [17,18], Hmim = 2-methylimidazole, Fig. 2) with the cubic crystal symmetry can fuse at room temperature to form large transparent blocks. After doping laser dye, this metal-organic optical ceramic (MOOC) can show the amplified spontaneous emission (ASE) with a very low energy-density threshold.MAF-4 nanocrystals with uniform size (ca. 20 nm) can be easily synthesized by reaction of Zn(NO 3 ) 2 and Hmim in methanol or ethanol at room temperature (Fig. S1). Compared with the commonly used solvent methanol [19], ethanol is nontoxic and more environment-friendly. After centrifugation and washed, the residual nanocrystals and solvent form a white gel-like (semi-fluidic) block.

show abstract

supporting

confidence: 66%

Room-temperature sintered metal-organic framework nanocrystals: A new type of optical ceramics

Zhou

Wang

et al. 2018

Sci. China Mater.

View full text Add to dashboard Cite

show abstract

“…Temperature effect on the size and distribution of MOF nanoparticles has frequently been studied. For example, Tsai and Langner have reported that as the synthesis temperature was increased from −15 °C to 60 °C, the average particle size on nano‐ZIF (ZIF=Zeolitic Imidazolate Framework) decreased (from 78 nm to 26 nm) and narrow particle size distribution was achieved . Nanoscale Eu‐btc frameworks (btc=benzenetricarboxylate) with various morphologies, including particle‐like, rod‐like, straw‐sheaf‐like nanostructures have been obtained by Dang et al .…”

Section: Synthesis Of Mof Nanocrystalsmentioning

confidence: 99%

“…For example, Tsai and Langner have reported that as the synthesis temperature was increased from À15 8C to 608C, the average particle size on nano-ZIF (ZIF = Zeolitic Imidazolate Framework) decreased (from 78 nm to 26 nm) and narrow particle size distribution was achieved. [40] Nanoscale Eu-btc frameworks (btc = benzenetricarboxylate) with various morphologies, including particle-like, rod-like, straw-sheaf-like nanostructures have been obtained by Dang et al [41] merely controlling the concentrations of the starting reactants. The choice of an appropriate solvent might be the critical factor in tuning the size of MOF particles.…”

Section: Mof Synthesismentioning

confidence: 99%

Metal‐Organic Framework Nanocrystals

Barros¹,

Neto

Frós

et al. 2018

ChemistrySelect

View full text Add to dashboard Cite

Metal‐organic frameworks (MOFs) comprise a broad class of crystalline materials defined as porous networks consisting of metal ions or clusters interconnected through polytopic organic linkers. Due to their intriguing structural and topological characteristics which usually offer high surface areas and tunable pore size, MOFs are excellent candidates for a great variety of applications, such as gas adsorption and separation, catalysis, magnetism, photoluminescence and many others. Although attractive, traditional bulk crystalline MOF materials do not always fulfill the specific needs for some applications, such as smart membranes, thin films devices, and drug delivery. Moreover, nanocrystals display properties that differ from the bulk material due to the high surface‐to‐volume ratio and quantum size effects. Thus, MOF nanocrystals will possibly present new and exciting properties or at least enhance the already known ones. With this view, it is necessary to develop efficient strategies towards the synthesis of MOF nanocrystals. This review provides general concepts of MOF nanocrystals and a critical summary of synthetic approaches with the focus on recent progress in the fabrication of MOF nanocrystals.

show abstract

“…[25] In the FTIR spectra of PVBA 42 -b-PS 36 .08,w hich are consistentw ith the valuesr eported in the literature. [29] According to the Scherrer equation Owing to the growth of ZIF-8 nanocrystals in ac onfined envi-ronment (from the surface of the aggregates), the ZIF-8 nanocrystalsa nchored to the surface of polymerica ggregates show small sizes. [29] According to the Scherrer equation Owing to the growth of ZIF-8 nanocrystals in ac onfined envi-ronment (from the surface of the aggregates), the ZIF-8 nanocrystalsa nchored to the surface of polymerica ggregates show small sizes.…”

Section: Structural Information On Zif-8 and Pvba-b-ps/zif-8 Hybrid Nmentioning

confidence: 99%

“…[28] Compared with that of bulk ZIF-8, the XRD spectra of PVBA 42 -b-PS 36 /ZIF-8 and PVBA 42 -b-PS 42 /ZIF-8 show both broader diffraction peaks, which demonstrates that the ZIF-8 nanocrystals grown from the surfaceo fp olymeric aggregates had small particle sizes. [29] According to the Scherrer equation, the average crystallite sizes of ZIF-8, PVBA 42 -b-PS 36 Owing to the growth of ZIF-8 nanocrystals in ac onfined envi-ronment (from the surface of the aggregates), the ZIF-8 nanocrystalsa nchored to the surface of polymerica ggregates show small sizes. The peak at 2q = 19.68 corresponds to the scattering of the amorphous phase of PVBA 42 -b-PS 42 ( Figure S4), which was not observed in PVBA-b-PS/ZIF-8 composites owing to the low scatteringi ntensity and low content of the copolymer.…”

Section: Structural Information On Zif-8 and Pvba-b-ps/zif-8 Hybrid Nmentioning

confidence: 99%

Poly(p‐vinylbenzoic acid)‐block‐polystyrene Self‐assembled Structures as Templates in the Synthesis of ZIF‐8

Yang

Zhang

et al. 2017

Chemistry An Asian Journal

View full text Add to dashboard Cite

Hybrid nanocrystals of PVBA-b-PS/ZIF-8 were prepared by the growth of ZIF-8 on the surface of the self-assembled structures from poly(p-vinylbenzoic acid)-block-polystyrene. Two different morphologies-micelles and vesicles-were obtained in selective solvents owing to the different ratios of PVBA to PS blocks. The structure and morphology of the PVBA-b-PS/ZIF-8 composites were characterized by Fourier transform IR spectroscopy, thermogravimetric analysis, X-ray diffraction, transmission electron microscopy and scanning electron microscopy. PVBA-b-PS/ZIF-8 showed high catalytic performance in Knoevenagel condensation reactions at room temperature, which were attributed to the more exposed active sites of the small ZIF-8 nanocrystals grown in a confined space and a high concentration of reactants in the polymeric aggregates.

show abstract

The effect of synthesis temperature on the particle size of nano-ZIF-8

Cited by 130 publications

References 19 publications

Room-temperature sintered metal-organic framework nanocrystals: A new type of optical ceramics

Room-temperature sintered metal-organic framework nanocrystals: A new type of optical ceramics

Metal‐Organic Framework Nanocrystals

Poly(p‐vinylbenzoic acid)‐block‐polystyrene Self‐assembled Structures as Templates in the Synthesis of ZIF‐8

Contact Info

Product

Resources

About