期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 40, 页码 37371-37378出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14522
关键词
sensor array; colorimetric; antioxidant discrimination; linear discriminant analysis; hierarchical clustering analysis
资金
- Scientific Research Project of Beijing Educational Committee [KM201710028009]
- Youth Innovative Research Team of Capital Normal University [19530050149]
- Capacity Building for Sci-Tech Innovation -Fundamental Scientific Research Funds [19530050179]
We present a simple, rapid, and effe/ctive colorimetric sensor array (or colorimetric electronic tongue) for discrimination of antioxidants, which is based on the oxidation etching of triangular silver nanoparticles (TriAgNPs) by three metal ions (Se2+, Sn4+, and Ni2+) as array's recognition elements and the inhibition of TriAgNP etching by antioxidants. Since highly reactive edges/tips of TriAgNPs are easier to be etched than other regions, the morphology of TriAgNPs undergoes a transition from nanoprism to nanodisk, accompanied by a color change from blue to yellow. The addition of diverse antioxidants inhibits TriAgNP etching in varying degrees, forming different etching morphologies with rainbowlike color. Surface plasmon resonance peak shift (Delta lambda) values of final TriAgNPs were captured as colorimetric signal outputs for further data processes. Linear discriminant analysis, hierarchical clustering analysis, heat map, etc. were adopted in the further data analysis process, showing the excellent discrimination ability of the sensor array for six antioxidants at 1 nM level. Moreover, selectivity experiments and practical application tests show that our sensor array had considerable selectivity and great potential in real samples.
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