Zeolite-A crystals with the average sizes of ~ 0.5 x 0.5 x 0.5 μm and ~1.7 x 1.7 x 1.7 μm and silicalite-1 crystals with the average size of ~1.6 x 1.2 x 0.6 μm were synthesized, and 3-aminopropyl (AP) and 3-chloropropyl (CP) groups, respectively, were tethered on the surfaces of each zeolite. The AP-tethering zeolite microcrystals (Z-AP) readily self-assembled into uniformly aligned monolayers with high degrees of coverage (DOCs) and close packing (DCPs) on the surfaces of conducting substrates (CSs) such as platinum (Pt), gold (Au), and indium-tin oxide (ITO) glass upon refluxing the toluene solution of Z-AP and CSs for 3 h. The CP-tethering zeolite (Z-CP) crystals also readily self-assembled into uniformly aligned monolayers in high DOCs and DCPs on the surfaces of CSs that were pre-coated with the polymeric amines such as dendritic polyamine (DPA) and polyethylenimine (PEI), respectively. The binding strength of the zeolite microcrystals to CS increased in the order: Z-AP-CS < Z-CP-DPA-CS < Z-CP-PEI-CS for a given CS and a given type of zeolite, and ITO < Au ≅ Pt for a given molecular linkage and a given type of zeolite.
Ha, Kwang, Jin Seon Park, Kyoung Sun Oh, Yun-Shan Zhou, Yu Sung Chun,Yun-Jo Lee, Kyung Byung Yoon
Microporous and Mesoporous Materials