Citation: LIU Jia, LI Qiao-Jun, WANG Chao, LI Kai, LIN Yu-Qing. Sensitive Detection of Iodine in Rat Brain Dialysate by Dark Field Microscopy Based on Iodine Etching Au@Ag Nanocubes[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(10): 1695-1702. doi: 10.19756/j.issn.0253-3820.191437 shu

Sensitive Detection of Iodine in Rat Brain Dialysate by Dark Field Microscopy Based on Iodine Etching Au@Ag Nanocubes

Department of Chemistry, Capital Normal University, Beijing 100048, China

Received Date: 23 July 2019
Revised Date: 22 August 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21575090), the High-level Teachers in Beijing Municipal Universities in the Period of 13th Five-year Plan (No. CIT&TCD20190330), the Scientific Research Project of Beijing Educational Committee (No. KM201810028008), the Youth Innovative Research Team of Capital Normal University and the Capacity Building for Science-Technology Innovation-Fundamental Scientific Research Funds (Nos. 19530050179, 025185305000/195).

The reaction process between Ag and I₂ was investigated by the localized surface plasmon resonance (LSPR) technique. Au@Ag nanocubes (Au@Ag NCs) were used as a probe to analyze the different color ratio and scattering intensity of the probe and I₂ after adding different concentrations of I^-/I₂ under the dark-field microscopy (DFM). Furthermore, transmission electron microscopy (TEM) and UV-Visible absorption spectra showed that Au@Ag NCs were continuously oxidized from the edges, gradually became spherical, and finally quasi-spherical. Finally, Au@Ag NCs were used as probes to test I₂. The detection range was from 0.1 μmol/L to 50 μmol/L with a detection limit of 17 nmol/L. This work laid the foundation for the study of oxidative corrosion between Ag and I₂, and also provided a new highly sensitive method for detection of I₂ in brain rat dialysate.
- Au@Ag nanocubes,
- Dark-filed microscopy,
- Scattering intensity,
- Iodine
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