Journal
ACS OMEGA
Volume 5, Issue 19, Pages 10696-10703Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.9b04199
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology [NRF-2018R1D1A1B07041584]
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A colorimetric sensor for the detection of citrate ions is reported here using dual-surfactant-capped Ag nanoparticles (dual-AgNP sensor). A mixture of cetyl trimethyl ammonium bromide and a newly prepared gemini nonionic (GFEO) surfactant was used as a capping agent to synthesize dual-surfactant-capped Ag NPs for selective and sensitive citrate detection. The GFEO surfactant was designed with a specific chemical structure to provide strong binding with citrate for selective and sensitive detection. The developed dual-AgNP sensor showed extremely high selectivity toward citrate even in the presence of interfering species. Quantitative detection of citrate was carried out based on the changes in UV-vis absorbance and naked-eye readout. After optimization, the dual-AgNP sensor exhibited a visual detection limit of 25 mu M and a low limit of detection of 4.05 nM with a UV-vis spectrometer. The developed citrate sensor performed well with a urine sample, with a high recovery of 99.6%. The prepared solution sensor was constructed on a paper-based analytical device.
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