Article

ChemInform Abstract: From the Bottom up: Dimensional Control and Characterization in Molecular Monolayers

California NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, USA. .
Chemical Society Reviews (Impact Factor: 33.38). 12/2012; 42(7). DOI: 10.1039/c2cs35365b
Source: PubMed

ABSTRACT

Self-assembled monolayers are a unique class of nanostructured materials, with properties determined by their molecular lattice structures, as well as the interfaces with their substrates and environments. As with other nanostructured materials, defects and dimensionality play important roles in the physical, chemical, and biological properties of the monolayers. In this review, we discuss monolayer structures ranging from surfaces (two-dimensional) down to single molecules (zero-dimensional), with a focus on applications of each type of structure, and on techniques that enable characterization of monolayer physical properties down to the single-molecule scale.

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    • "Especially, the resolution below the 100 nm range is not easily achievable in some cases. To solve these problems, more and more attempts based on bottom-up techniques have been performed to make functional nanomaterials91011. The bottom-up approach provides the possibility to create hierarchical and ordered nanostructures and nanomaterials by taking advantages of the physicochemical interactions and self-assembly of molecules and nanoscale building blocks. "
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    ABSTRACT: The combination of nanotechnology, biology, and bioengineering greatly improved the developments of nanomaterials with unique functions and properties. Biomolecules as the nanoscale building blocks play very important roles for the final formation of functional nanostructures. Many kinds of novel nanostructures have been created by using the bioinspired self-assembly and the subsequent binding with various nanoparticles. In this review, we summarized the studies on the fabrications and sensor applications of biomimetic nanostructures. The strategies for creating different bottom-up nanostructures by using biomolecules like DNA, protein, peptide, and virus, as well as microorganisms like bacteria and plant leaf are introduced. In addition, the potential applications of the synthesized biomimetic nanostructures for colorimetry, fluorescence, surface plasmon resonance, surface-enhanced Raman scattering, electrical resistance, electrochemistry, and quartz crystal microbalance sensors are presented. This review will promote the understanding of relationships between biomolecules/microorganisms and functional nanomaterials in one way, and in another way it will guide the design and synthesis of biomimetic nanomaterials with unique properties in the future.
    Full-text · Article · Jan 2016 · Materials
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    • "The ability to control surface geometry and chemistry has led to hydrophobic coatings [1], electro-chemical [2] and biochemical sensors [3]. Applications are emerging for capturing biomolecules and 5 nanoparticles [4] and as elements in electronic devices [4] [5]. The physics of nanostructuring on highly oriented pyrolytic graphite (HOPG) is of relevance to graphene; SAMs on graphene have been used to provide n-doping [6], develop "
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    ABSTRACT: Large areas of nanoscale stripe arrays were produced by drop casting silica nanoparticle solutions on highly oriented pyrolytic graphite surfaces at room temperature and imaged with atomic force microscopy. The alignment of the striped areas always reflected the threefold symmetry of the graphite surface. Two different patterns were observed, with different coverages, line separations and mutual orientation, being offset by 30°. Measurement of the relative angles and separations of the line patterns showed a very good match with an underlying Moiré pattern, resulting from the rotation of the top graphene layers. Closer-spaced lines were attributed to the zig-zag direction of the Moiré pattern whereas wider-spaced lines belonged to the armchair direction. The different abundance and apparent difference in long-term stability suggested that stability was governed by the number of reactive vertices per unit area as opposed to the number of vertices per line-length. Whilst sequential images recorded over several days revealed long term stability of all zig-zag arrays, attachment and detachment of single nanoparticles was observed. By contrast, arrays aligned in the armchair direction appeared and vanished collectively, suggesting condensation and evaporation of a fluid of nanoparticles floating on the surface.
    Full-text · Article · Sep 2015

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