Figure 3: Femtolitre synthesis and controlled crystallization of MOFs.
From: Femtolitre chemistry assisted by microfluidic pen lithography
(a–c) FESEM images of the synthesized HKUST-1 crystal array (feature distance=25 μm), confirming the reproducibility of the femtolitre droplet-by-droplet reaction and showing the well-defined octahedral shape of the resulting HKUST-1 crystals. (d,e) FESEM images of the multiplexed 4 × 4 array of crystalline PBAs with general formula M3[Co(CN)6]2, where M is Cd(II), Zn(II) and Mn(II), and Ag3[Co(CN)6] (PBA feature distance=25 μm). (f–i) FESEM image of an individual island containing the synthesised Cd(II)-PBA (f), Zn(II)-PBA (g), Mn(II)-PBA (h), Ag(I)-PBA (i) nanocrystals (scale bars, 2 μm), and their corresponding electron diffraction patterns, plus tables comparing the measured interplanar distances (d) with the corresponding literature values: A, JCPDS No. 89-3740; B, JCPDS No. 32-1468; C, JCPDS No. 89–3735; and D, ICSD- 28501.
