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  • 09월 05일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제120회 대한화학회 학술발표회, 총회 및 기기전시회 안내 A colorimetric probe to determine NO2- using label free gold nanocrystals

2017년 7월 28일 10시 04분 06초
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목 09시 : 20분
Analytical Chemistry - Oral Presentation of Young Analytical Chemists I
저자 및
Kyungmin Kim, Yun Sik Nam1, Kang-Bong Lee2,*
Department of Chemistry, Korea University, Korea
1Advanced Analysis Center, Korea Institute of Science and Technology, Korea
2Green City Technology Institute, Korea Institute of Science and Technology, Korea
A simple and sensitive colorimetric method for the determination of NO2- ions in aqueous samples was developed using gold nanocrystals (AuNCs). The NO2- ion is selectively etched AuNCs and changing the particle shape. This etching resulted in a dramatic color change from vivid blue to light red. Using this methodology, the concentration of NO2- ions in environmental, biological and sitological samples could be quantitatively detected by the naked eye or by using UV-Vis spectrometry. Also, we found that the selectivity and sensitivity of the detection was noticeably improved at the 20mM of NaCl concentration, at which a more obvious color change was observed. The absorption ratios (A550/A650) of the modified AuNCs solution exhibited a linear correlation with NO2- ion concentrations within the linear range of 0.0~10 ppm, and the limits of detection in tap water, pond water and waste water were 38.45 nM and 0.46 μM, respectively. This cost-effective sensing system allows for the rapid and facile determination of NO2- ions in aqueous samples.