Synthesis, Manipulation and Conductivity of Supramolecular Polymer Nanowires

Dong, L.; Hollis, Tom; Fishwick, Steven; Connolly, Bernard A.; Wright, N. G.; Horrocks, Benjamin R.; Houlton, Andrew

doi:10.1002/chem.200601320

Cited by 83 publications

(124 citation statements)

References 48 publications

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“…To a large extent, the excellent functionalities of organic materials depend on their size and shape; thus, it is necessary to pay careful attention to the control of their morphology and dimensionality. Although many organic nanomaterials with different shapes, including nanotubes, [4] nanowires, [5] nanorods, [6] and other nanostructures, [7] have been synthesized based on the self-assembly of an organic molecule, the ability to tune the size and morphology of organic materials lags well behind their inorganic counterparts and needs to be improved urgently. Therefore, it is still a challenge to develop advanced methods to fabricate organic materials with uniform sizes and novel microstructures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Microscale Raft‐shaped Zinc(II)–Phenylalanine Complexes and Zinc(II)–Phenylalanine/dye Hybrid Bundles with New Optical Properties

Cong

2007

Adv Funct Materials

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Novel raft‐like zinc(II)–phenylalanine complexes and zinc(II)–phenylalanine/acid green 27 (AG27) hybrid radial bundles have been successfully synthesized by a simple refluxing reaction. The formation processes of the morphologies and the superstructures of the hybrid bundles were proposed based on the time‐dependent evolution process. The AG27 molecules act as both the inclusion compound and the controller of the morphologies and the superstructures of the final hybrid. The combination of the zinc(II)–phenylalanine complex and AG27 leads to distinct optical properties compared with the individual component materials. This approach opens a new and effective way for the fabrication of amino acid/dye hybrid materials with unique optical properties and is expected to allow access to other organic/organic hybrid materials with structural specificity and functional novelty.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Microscale Raft‐shaped Zinc(II)–Phenylalanine Complexes and Zinc(II)–Phenylalanine/dye Hybrid Bundles with New Optical Properties

Cong

2007

Adv Funct Materials

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“…While this technique has become widely used for native bare DNA, the ability for modified strands, for example, metallized and others, to be aligned is not generally developed. We have recently demonstrated that it is possible to align DNA-polypyrrole nanowires using this method [27] but examples are rare. [16] It was therefore interesting to realize that the CdS nanowires prepared in solution could be manipulated in this way.…”

mentioning

confidence: 98%

DNA‐Templated Semiconductor Nanoparticle Chains and Wires

et al. 2007

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Confining the growth of semiconductor materials to the low nanometer regime provides access to size quantization phenomena that may be exploited for a range of applications, such as probing intracellular processes, chemical and biological sensing, and nanometer-scale electronics.[1-4] Whilst control over length scales is well-developed for many types of materials, their form (e.g., dimensionality) and subsequent organization into hierarchical and functional systems remains challenging. One approach that is proving successful in addressing these problems is the use of biopolymers as templates, scaffolds, and interconnects. [5][6][7][8][9][10] DNA has been particularly effective in this regard and has been used to grow and/ or organize both inorganic (e.g., CdS, ZnS) [11][12][13][14][15][16][17] and molecular-based (e.g., polyaniline) semiconductor materials. [18][19][20] Here, we report the use of DNA strands, both surface-immobilized and in solution, to template the growth and organization of the binary semiconductor CdS. Through careful optimization of the reaction conditions and the state of the DNA, we have been able to control the reaction and prepare quantum-confined CdS as either 1D chainlike assemblies of particles or as uniform nanowires. The latter were subsequently integrated into a simple two-terminal electrical device to demonstrate the utility of these materials as possible nanometerscale electronic components.Reactions of cadmium and sulfide ions on surface-bound DNA employed two different surface types: mica, and alkyl monolayers on single-crystal Si(111). The mica surfaces allowed the DNA molecules to be anchored via interactions between the metal ions, the surface oxygen functionalities, and the phosphate groups. The alkyl monolayers on Si(111) provide an inert, flat surface on which DNA may be conveniently aligned by combing. [21,22] On mica substrates k-DNA was spotted onto a freshly cleaved surface and allowed to incubate with Cd(NO 3 ) 2 for 10 min. at room temperature. After rinsing, the surface was treated with a solution of 1 mM Na 2 S. Initially aqueous sulfide solutions were used, but in these cases rapid precipitation occurred and randomly deposited material was observed. Instead, treatment with 1 mM Na 2 S in a 1:1 water/ethanol mixture (v/v) gave the desired selective growth of CdS on the DNA template. Figure 1 shows a typical atomic force microscopy (AFM) image of the surface after reaction.Nanoparticles can be seen adhering on the DNA strands, resulting in a beads-on-a-chain appearance. The particles are also highly monodisperse, with diameters (width data) in the range 11.3-16.7(±1.4) nm (average 14.2 nm ± 10 %). Furthermore, there is a notable registry of the particles along the length of some of the polymer chains. In marked contrast, reactions at DNA that had been aligned through combing onto alkylated Si(111) produced material that was much less regular in appearance. After reaction, the surface was found to contain randomly coiled strands, indicating that the DNA is mobile dur...

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“…Figure 4 shows the fabrication process of polyaniline/DNA nanowires introduced by Ma et al (2004). Polypyrrole nanowires were chemically polymerized on mica with FeCl 3 oxidant using DNA as a template by Dong et al (2007). Moon et al (2010) also chemically polymerized polypyrrole nanowires using DNA as a template on a (3-aminopropyl)triethoxysilane modified silicon wafer with ammonium persulfate as an oxidant.…”

Section: Soft Templatementioning

confidence: 99%

“…Figure 3 shows AFM images of conducting polymer nanowires using DNA as a template. (Dong et al, 2007); (b) DNA/polypyrrole nanowire (Moon et al, 2010); (c) DNA/polyindole nanowires aligned between Au electrodes (Hassanien et al, 2010).…”

Section: Soft Templatementioning

confidence: 99%