Abstract
We use dodecanoic acid as a modulator to yield titanium MOF nanoparticles with good control of size and colloid stability and minimum impact to the properties of the framework to enable direct fabrication of crystalline, porous thin films.
Highlights
The synthesis of MOF NPs involves a strict control of the nucleation and growth of the framework by optimization of experimental variables such as the concentration of the precursors and the reaction temperature or time
The intrinsic properties of titanium such as its high polarizing power, low-toxicity, natural abundance or photo-redox activity endow these frameworks with desirable chemical stability or photocatalytic activity[14]
Our study shows the ability of dodecanoic acid (DA) to control the synthesis of Ti-nanoMOFs for producing homogeneous dispersions of non-defective NPs down to 70 nm in size, that show excellent colloid stability, and can be assembled into highquality thin films that retain the porosity of the bulk
Summary
The synthesis of MOF NPs involves a strict control of the nucleation and growth of the framework by optimization of experimental variables such as the concentration of the precursors and the reaction temperature or time. Previous works demonstrate the difficulties in synthesising homogeneous dispersions of NPs of the archetypical MIL-125-NH2 below 200 nm.[15,16,17] To the best of our knowledge, there are only two reports of nanocrystals close to the 100 nm nanoparticle limit by using either a polymer as directing agent[18] or p-toluylic acid as modulator.[19] As result of polymer encapsulation or modulator incorporation, these two routes impose significant changes to the local structure of the framework by introduction of defects or its porosity compared to bulk crystals .
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