Colorimetric quantitative sensing of alkali metal ions based on reversible assembly and disassembly of gold nanoparticles |
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| Authors: | Chil Seong Ah Wan-Joong Kim Wan Soo Yun Sang-Woo Joo |
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| Institution: | 1. Next Generation Display Research Department, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700, Republic of Korea;2. Bio-Medical IT Convergence Research Department, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-700, Republic of Korea;3. Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Republic of Korea;4. Department of Chemistry, Soongsil University, Seoul 156-743, Republic of Korea |
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| Abstract: | A novel and simple method for the colorimetric quantitative sensing of individual alkali metal ions (Li+, Na+, K+, and Rb+) based on the reversible properties of self-assembled aggregates and individual gold nanoparticles (Au NPs) is described. This paper demonstrates reversible self-assembly processes where the degree of assembly and disassembly is dependent on the individual alkali metal ion concentration, nanoparticle size, and alkali metal ionic radii. The color changes of the colloidal Au NPs with metal ion concentrations in colloidal NP solutions occur reversibly. Below a certain concentration of alkali metal ions, the aggregates of Au NPs are redispersed. As the Au NP diameters and the alkali metal ionic radii increase, the critical concentration decreases. |
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| Keywords: | Alkali metal ion sensing Reversible assembly and disassembly Gold nanoparticle Colorimetric Quantitative |
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