کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1166661 1491141 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Highly sensitive trace analysis of paraquat using a surface-enhanced Raman scattering microdroplet sensor
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Highly sensitive trace analysis of paraquat using a surface-enhanced Raman scattering microdroplet sensor
چکیده انگلیسی

We report a rapid and highly sensitive trace analysis of paraquat (PQ) in water using a surface-enhanced Raman scattering (SERS)-based microdroplet sensor. Aqueous samples of PQ, silver nanoparticles, and NaCl as the aggregation agent were introduced into a microfluidic channel and were encapsulated by a continuous oil phase to form a microdroplet. PQ molecules were adsorbed onto particle surfaces in isolated droplets by passing through the winding part of the channel. Memory effects, caused by the precipitation of nanoparticle aggregates on channel walls, were removed because the aqueous droplets were completely isolated by a continuous oil phase. The limit of detection (LOD) of PQ in water, determined by the SERS-based microdroplet sensor, was estimated to be below 2 × 10−9 M, and this low detection limit was enhanced by one to two orders of magnitude compared to conventional analytical methods.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytica Chimica Acta - Volume 681, Issues 1–2, 29 November 2010, Pages 87–91
نویسندگان
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