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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Sensitive and selective detection of NO2 ion using modified gold nanoparticle as a colorimetric sensor

등록일
2014년 8월 27일 14시 25분 17초
접수번호
0448
발표코드
ANAL.P-517 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
분석화학
저자 및
공동저자
노권철, 남윤식1, 이강봉1,*
고려대학교 화학과, Korea
1한국과학기술연구원(KIST) 특성분석센터, Korea
A sensitive and selective colorimetric method for determination of nitrite ion in aqueous samples was developed using 1-(2-mercaptoethyl)- 1,3,5-triazinane- 2,4,6-trione-functionalized gold nanoparticles (MTT-GNPs). The nitrite ion seems to be used as a “molecular bridge”, which can form NH?N and NH?O hydrogen bonds with the MTT-GNPs, shorten the interparticle distance, and induce the aggregation of the MTT-GNPs. This aggregation results in a dramatic change from wine-red to purple?gray color. Therefore, the concentration of nitrite ion in environmental samples can be quantitatively detected using the MTT-GNPs sensor by the naked eyes or UV?vis spectrometer. Moreover, investigations have revealed the sensitivity of the detection could be clearly improved by modulating pH of the solution, which led to a more rapid color change in the optimized GNPs system. The absorption ratios (A790/A535) of the modified GNPs solution exhibited a linear correlation with nitrite ion concentrations and the limit of detection was 1ppm. This cost effective sensing system allows for the rapid and facile determination of the concentration of NO2 ions in aqueous samples.

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