Controlling the alignment of 1D nanochannel arrays in oriented metal–organic framework films for host–guest materials design

Abstract

Controlling the direction of molecular-scale pores enables the accommodation of guest molecular-scale species with alignment in the desired direction, allowing for the development of high-performance mechanical, thermal, electronic, photonic and...

Infrared crystallography for framework and linker orientation in metal–organic framework films

“…Oriented CuBDC and Cu 2 (1,4-NDC) 2 DABCO (1,4-NDC: 1,4naphthalenedicarboxylate) lms were grown from Cu(OH) 2 nanobelt lms via a heteroepitaxial growth approach. 20,21 MOF lms with high and low degrees of in-plane orientation were prepared on silicon substrates from aligned and randomly aligned Cu(OH) 2 nanobelt lms (see ESI † for Cu(OH) 2 preparation and characterization). The corresponding SEM images and XRD patterns are given in Fig.…”

“…[16][17][18] Although, this method allows to control the orientation of the lattice plane parallel to the substrate (out-of-plane orientation) by changing the terminated functional group of the SAM, these MOF lms lack in-plane orientation. 19 Recently, our group reported a synthetic method to obtain threedimensionally oriented 2D and 3D Cu-based MOF lms by epitaxial growth on copper hydroxide, 20,21 yielding large scale lms with controlled pore alignment.…”

“…rotating the sample around the axis perpendicular to the substrate center (4 axis) at constant X-ray source and detector position. [20][21][22] Besides dedicated diffractometer equipment and rather long measurement times of several hours, this method requires for considerably thick MOF lms (typically >40 layers of LbL MOF lms) to achieve sufficient signal-to-noise ratios.…”

Oriented growth of semiconducting TCNQ@Cu3(BTC)2 MOF on Cu(OH)2: crystallographic orientation and pattern formation toward semiconducting thin-film devices

“…1c). [25][26][27][28][29] The diffraction patterns can be attributed to Cu 3 (BTC) 2 and Cu(OH) 2 (see Fig. S2 †).…”

“…In the present study, we have, for the rst time, successfully fabricated Cu 3 (BTC) 2 thin lms with both out-of-plane and in-plane orientations by employing an epitaxial growth approach on Cu(OH) 2 that we developed. [25][26][27][28][29] Both the lattice matching at the Cu 3 (BTC) 2 / Cu(OH) 2 interface and the interface bonding (local chemical connection matching; spatial matching of Cu atoms across the interface) allow the crystallographic orientation of Cu 3 (BTC) 2 . The epitaxial growth approach enables the fabrication of oriented TCNQ@Cu 3 (BTC) 2 thin lms, where the {111} lattice plane, which can be a conducting path, is oriented both parallel and perpendicular to the substrate.…”