Fabrication of bimetallic microfluidic surface-enhanced Raman scattering sensors on paper by screen printing

Research output: Contribution to journalArticlepeer-review

Authors

  • Lu-Lu Qu
  • Qi-Xia Song
  • Yuan-Ting Li
  • Mao-Pan Peng
  • Da-Wei Li
  • Li-Xia Chen
  • Yi-Tao Long

Colleges, School and Institutes

External organisations

  • State Key Laboratory of Bioreactor Engineering & Department of Chemistry, East China University of Science and Technology, Shanghai 200237, PR China.

Abstract

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 1.1×10(-13)M and an enhancement factor of 8.6×10(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.

Bibliographic note

Copyright © 2013 Elsevier B.V. All rights reserved.

Details

Original languageEnglish
Pages (from-to)86-92
Number of pages7
JournalAnalytica Chimica Acta
Volume792
Publication statusPublished - 20 Aug 2013

Keywords

  • Gold, Metal Nanoparticles, Microfluidics, Micropore Filters, Paper, Printing, Reproducibility of Results, Silver, Spectrum Analysis, Raman, Surface Properties, Waste Water