期刊
ANALYTICAL CHEMISTRY
卷 89, 期 4, 页码 2424-2431出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.6b04324
关键词
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资金
- National Natural Science Foundation of China [21375043, 21175051]
- National Key RD Program [2016YFD0500700]
Rapid sampling and multicomponent detection are crucial for monitoring of pesticide residues analysis. Here, a gecko-inspired nanotentacle surface-enhanced Raman spectroscopy (G-SERS) platform is proposed for the first time for the simultaneous detection of three kinds of pesticides via a simple and intuitive press and peeled-off approach. The G-SERS platform obtained from seeding deposition of silver nanoparticles (Ag NPs) on 3D PDMS nanotentacle array is flexible and free-standing. Compared with other substrates, this G-SERS substrate can simultaneously provide outstanding SERS activity (enhancement factor = 1.2 X 107), superior reproducibility (RSD = 5.8%) and countless flexible nanoscale tentacles (similar to 6.7 X 10(8)/cm(2)). Moreover, the high density of tentacles can freely approach the microarea and enable efficient target collection, which were confirmed by SEM and HPLC. By direct sampling from cucumber, apple, and grape surfaces, thiram (TMTD), methyl parathion (MPT), malachite green (MG), and their multiple components have been rapidly and reliably determined. For example, under the optimal conditions, a sensitivity of 1.6 ng/cm(2) (S/N = 3) for TMTD was obtained on apple peels with a coefficient (R) of 0.99. Therefore, the G-SERS substrate could offer a great practical potential for on-spot identification of various pesticide residues on real samples. correlation
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