Abstract
The co-adsorption behavior of nucleic-acid base (thymine; cytosine) and melamine was investigated by scanning tunneling microscopy (STM) technique at liquid/solid (1-octanol/graphite) interface. STM characterization results indicate that phase separation happened after dropping the mixed solution of thymine-melamine onto highly oriented pyrolytic graphite (HOPG) surface, while the hetero-component cluster-like structure was observed when cytosine-melamine binary assembly system is used. From the viewpoints of non-covalent interactions calculated by using density functional theory (DFT) method, the formation mechanisms of these assembled structures were explored in detail. This work will supply a methodology to design the supramolecular assembled structures and the hetero-component materials composed by biological and chemical compound.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1767-0) contains supplementary material, which is available to authorized users.
Highlights
Molecular self-assembly is well-acknowledged as an important bottom-up approach which has been extensively adopted to fabricate nanomaterials under moderate experimental conditions
A typical scanning tunneling microscopy (STM) image for the assembled structure formed by melamine molecules had been given in Fig. 2a, which indicates that the assembled layer with well-ordered pattern
With the aim of fabricating well-aligned biomolecular arrays of nucleic-acid bases meshed by the porous network of melamine, two kinds of nucleic-acid bases were tentatively chosen as guest molecules to investigate their co-assembly behavior at liquid-solid interface
Summary
Molecular self-assembly is well-acknowledged as an important bottom-up approach which has been extensively adopted to fabricate nanomaterials under moderate experimental conditions. Two-dimensional (2D) supramolecular nanostructures have attracted more attention because of their potential applications They had been used as primary molecular templates or host for guest molecules in the subsequent multi-component self-assembly systems [4,5,6,7,8]. Rafael et al [20] had Generally, the appropriate choice of building block is one of primary fundamental conditions in order to construct an ideal porous network through using molecular self-assembly approach. Possessing a planar molecular structure with three-fold symmetry and three functional groups at the apexes [21,22,23], melamine tends to form different artistic architectures such as honeycomb network, rosette, and ribbon under ultra-high vacuum (UHV) or ambient condition [20, 24,25,26,27,28].
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