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Conference Paper
Quantitative Colorimetric Detection of Alkali Metal Ions by Reversible Color Changes of Gold Nanoparticles
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- Authors
- C. S. Ah, H. Ryu, H. Y. Chu, H. Yu
- Issue Date
- 2013-09
- Citation
- International Conference on Surfaces, Coatings and Nanostructured Materials (NanoSMat) 2013, pp.222-223
- Language
- English
- Type
- Conference Paper
- Abstract
- Self-assembly methods of nanoparticles (NPs) have been a topic of significant interest as a powerful quantitative and highly-sensitive tool to detect biomaterials and metal ions. In particular, reversible self-assembly of NPs is very useful for detecting target molecules reversibly and has an advantage of improved reproducibility and stability in detection. However, with all the importance of controllable self-assembly/disassembly, a few works have been made for reversible self-assembly system using nanoparticles so far [1-3]. Most self-assembly processes employed are irreversible and even hard to manipulate, once aggregates, nano networks are often hardly return to the original states. For example, the hydrogen bonding interaction, antibody-antigen recognition, interaction, electrostatic forces, streptoavidin-biotin interaction are often irreversible. For practical applications, design of reversible design in a controllable way is prerequisite. In this study, a new simple method for quantitatively colorimetric detecting of individual alkali metal ions (Li+, Na+, K+, Rb+) using reversible properties between threedimensional self-assembly network aggregates and individual gold nanoparticles was described. UV-vis spectroscopy studies demonstrate reversible self-assembly processes where the degree of assembly/disassembly depends on the concentration of individual alkali metals as well as the size of the nanoparticles. Below the certain concentration of alkali metal ions, the aggregates of gold nanoparticles were redispersed. As the diameter of gold nanoparticles and ionic radius of alkali metals increases, the critical concentration decreases.
- KSP Keywords
- Alkali metal ions, Antibody-antigen recognition, Colorimetric detection, Critical concentration, Electrostatic force, Gold Nanoparticles(GNPs), Hydrogen bonding interaction, Ionic radius, Nanoparticles self-assembly, Uv-Vis Spectroscopy, assembly process