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The Effect of Nanoparticle Shape and Stoichiometry on Reversible Assembly Properties of Plasmonic Nanoparticles

  • 박현규 (Park, Hyon-Gyu, 대학원 신소재공학과 신소재공학전공)

초록/요약

We have synthesized polyvalent DNA-silver nanocube conjugates and investigated their chemical and physical properties. The DNA loading of the conjugates has been effectively controlled via chemical modification of the cube surface. Importantly, we have discovered that the reversible cooperative assembly properties of the conjugates are significantly associated with the flat surface of the conjugates’ cubic structure, which is distinctive from the conventional DNA-spherical nanoparticle conjugates. A DNA detection scheme based upon the distance-dependent optical properties of DNA-silver nanocube conjugates has been demonstrated. On the other hand, we present a stoichiometric titration method to determine the concentration of nanoparticles of various materials, sizes and shapes. We have discovered that the optical response associated with the assembly formation is maximized when two types of nanoparticles attractively interact at a specific ratio, regardless of the particle type. Based on the reversible hybridization properties of two complementary DNA sequences used to assemble the particles, the assembly-based titration of various nanoparticles of unknown concentrations is visually demonstrated with high accuracy and reliability, which is analogous to the classic molecular titration method.

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목차

Abstract
Contents
List of Figures and table

1. Introduction
2. Shape-Dependent Reversible Assembly Properties, and Diagnostic Applications of Polyvalent DNA-Silver Nanocube Conjugates
2.1. Experimental Section
2.2. Results and Discussion
3. Assembly-Based Titration for the Determination of Monodisperse Plasmonic Nanoparticle Concentrations Using DNA
3.1. Experimental Section
3.2. Result and Discussion
4. Conclusion

References

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