期刊
IEEE SENSORS JOURNAL
卷 14, 期 2, 页码 436-441出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2013.2279916
关键词
Heavy metal sensor; ultrahigh sensitivity; surface plasmon; PAA membrane; SERS
资金
- Yousef Jameel Science and Technology Center
- American University in Cairo [YJ-2]
A novel technique for rapid and ultrahigh sensing of heavy metals in aqueous media based on microfluidic platform integrated with porous anodic alumina (PAA) membrane and functionalized with ultrathin porous layer of highly ordered hexagonal arrays of Au nanoparticles with 25 nm sub-gaps is proposed. The sensor function is based on both chemical and electromagnetic enhancement. Both were achieved by increasing the number of hot spots and by increasing the density of the Au-nanoparticles at the surface of the PAA membrane up to 7x10(10) cm(-2). The sensor demonstrated high selectivity between three different heavy metal ions (Hg2+, Cd2+, Pb2+, Cu2+, Co2+, and Ni2+) with concentrations varied from 1 to 20 ppb (1x10(-3) to 20x10(-3) mu g/ml). The platform provides an instant and fully integrated detection method that is based on in-situ surface-enhanced Raman scattering (SERS) spectroscopy. The observed Raman enhancement is due to the excitation and interference of surface plasmon waves, which are highly dependent on the type and concentration of the heavy metal. Therefore, the proposed sensor is an unprecedented fully integrated platform that is easy to fabricate and seamlessly integrated with an in-situ signal detection device for added functionality.
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