文献类型：期刊文献

英文题名：Fabrication of bimetallic microfluidic surface-enhanced Raman scattering sensors on paper by screen printing

作者：Qu, Lu-Lu[1,2];Song, Qi-Xia[1,2];Li, Yuan-Ting[1,2];Peng, Mao-Pan[1,2];Li, Da-Wei[1,2];Chen, Li-Xia[1,2];Fossey, John S.[1,2,3];Long, Yi-Tao[1,2]

机构：[1]E China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[3]Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England

年份：2013

卷号：792

起止页码：86

外文期刊名：ANALYTICA CHIMICA ACTA

收录：;EI(收录号：20133216589923);WOS:【SCI-EXPANDED(收录号:WOS:000323468300012)】；

基金：This research was supported by the National Science Fund for Distinguished Young Scholars (21125522), the National Natural Science Foundation of China (21007015), the Fundamental Research Funds for the Central Universities (WK1214021, WB1113005), and J.S.F. thanks ECUST for Guest Professorship.

语种：英文

外文关键词：Surface-enhanced Raman scattering; Bimetallic; Microfluidic sensors; Paper; Screen printing

摘要：Au-Ag bimetallic microfluidic, dumbbell-shaped, surface enhanced Raman scattering (SERS) sensors were fabricated on cellulose paper by screen printing. These printed sensors rely on a sample droplet injection zone, and a SERS detection zone at either end of the dumbbell motif, fabricated by printing silver nanoparticles (Ag NPs) and gold nanoparticles (Au NPs) successively with microscale precision. The microfluidic channel was patterned using an insulating ink to connect these two zones and form a hydrophobic circuit. Owing to capillary action of paper in the millimeter-sized channels, the sensor could enable self-filtering of fluids to remove suspended particles within wastewater without pumping. This sensor also allows sensitive SERS detection, due to advantageous combination of the strong surface enhancement of Ag NPs and excellent chemical stability of Au NPs. The SERS performance of the sensors was investigated by employing the probe rhodamine 6G, a limit of detection (LOD) of 1.1 x 10(-13) M and an enhancement factor of 8.6 x 10(6) could be achieved. Moreover, the dumbbell-shaped bimetallic sensors exhibited good stability with SERS performance being maintained over 14 weeks in air, and high reproducibility with less than 15% variation in spot-to-spot SERS intensity. Using these dumbbell-shaped bimetallic sensors, substituted aromatic pollutants in wastewater samples could be quantitatively analyzed, which demonstrated their excellent capability for rapid trace pollutant detection in wastewater samples in the field without pre-separation. (c) 2013 Elsevier B.V. All rights reserved.