期刊
ANALYST
卷 138, 期 4, 页码 1195-1203出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2an36293g
关键词
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资金
- NSF-PREM [DMR-0611539]
- NSF-CREST [HRD-0833178]
- Department of Defence High Performance Computational Design of Novel Materials [W912HZ-09-C-0108]
- Division Of Human Resource Development
- Direct For Education and Human Resources [833178] Funding Source: National Science Foundation
Iodine is a biophilic and essential trace element for all life and especially for vertebrates, which require it to produce indispensable thyroid hormones in their thyroid glands. As a result, the adequate measurement of iodine in water and food samples is crucial to lead a healthy life. Motivated by its importance, this is the first time in the literature that the highly selective and ultra sensitive (30 ppt limit) surface enhanced Raman scattering (SERS)-based detection of iodide ions (I-) from environmental and food samples has been reported. The desired sensitivity and selectivity has been achieved by measuring the change in the SERS intensity originating from Rh6G-adsorbed 30 nm gold nanoparticles (GNPs) upon the addition of I-. The strong chemical affinity offered by I- towards the gold surface results in extra negative charge being deposited on it. As a result, the GNP surface attracts a greater number of positively charged Rh6G molecules and induces a marked increase in the number of hot spots through aggregation, providing a significant enhancement of the Raman signal intensity. The oxidation of I- to molecular iodine (I-2) by hydrogen peroxide (H2O2) is employed for the successful screening of the bromide ion (Br-) which shows substantial interference at higher concentrations.
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