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novel approach to promote the nucleation and growth of the
COF-5 layered film on the porous support. This is the first COF
membrane successfully fabricated and grown on a commonly
used porous a-Al2O3 support.
Financial support was provided by the Liaoning Scientific
Research Starting foundation for PhD, Research Foundation for
PhD Program, and the ‘‘Hundred-Talent Program’’ of Dalian
Institute of Chemical Physics, Chinese Academy of Sciences,
China. Dr Yong Wang is gratefully acknowledged for the
structural drawing of COF-5.
Notes and references
ˆ ´
1 A. P. Cote, A. I. Benin, N. W. Ockwig, M. O’Keeffe, A. J. Matzger and
Fig. 3 XRD pattern of the supported COF-5 membrane grown on the
modified ceramic a-Al2O3 support.
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ˆ ´
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significant particle aggregation of the COF-5 powders in the bulk
(Fig. 1b). Furthermore, the FTIR spectra of the COF-5 powders
confirmed the formation of the expected boron-based ring,
displaying the bands corresponding to the respective boronate
ester ring (Fig. 1c), and the hydroxyl bands of the starting
materials were strongly attenuated in the COF-5 material.
Fig. 2(a) and (b) show the SEM images of the surface and
cross-section of the ceramic porous support. The asymmetrical
support has a smooth and uniform surface with a pore size of
B40 nm, and a thickness of the a-Al2O3 layer of 3–4 mm. The
SEM image shows that the discrete COF-5 layer was formed if
the support surface was not treated with the covalent linkers of
the APTES and FPBA, as shown in Fig. 2c. In contrast, the SEM
images indicate that the functionalized a-Al2O3 support was
completely covered with the well intergrown COF-5 layers, with
12 N. Stock and S. Biswas, Chem. Rev., 2012, 112, 933.
¨
a thickness of the COF-5 membrane of B1 mm (Fig. 2d–f). 13 D. Zacher, O. Shekhah, C. Woll and R. A. Fischer, Chem. Soc. Rev.,
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No obvious cracks or defects are visible on the surface of the
as-fabricated COF-5 membrane. The results indicate that the
14 R. Banerjee, A. Phan, B. Wang, C. Knobler, H. Furukawa,
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support indeed facilitate the formation of the continuous and
compact COF-5 layers on the functionalized porous a-Al2O3
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ceramic support. Furthermore, Fig. 3 shows the XRD pattern of
the COF-5 membrane grown on the porous a-Al2O3 support. The
XRD results confirmed the formation of the COF-5 membrane on
the a-Al2O3 support; the poor diffraction peaks can be assigned
to the as-fabricated COF-5 membrane, in addition to the strong
peaks of the a-Al2O3 support. The COF membranes fabricated on
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21 L. K. Ritchie, A. Trewin, A. Reguera-Galan, T. Hasell and A. I. Cooper,
application in gas storage, separation and enrichment fields.
In summary, via the formation of the covalent linkage between
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1464 | Chem. Commun., 2014, 50, 1462--1464
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