A gold nanohole array based surface-enhanced Raman scattering biosensor for detection of silver(i) and mercury(ii) in human saliva. Issue 25 (26th May 2015)

• Record Type: Journal Article
• Authors: Zheng, Peng; Li, Ming; Jurevic, Richard; Cushing, Scott K.; Liu, Yuxin; Wu, Nianqiang
• Is Part Of: Nanoscale. Volume 7:Issue 25(2015)
• Page Start: 11005
• Page End: 11012
• Publication Date: 2015-05-26
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr02142a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A sensitive SERS sensor has been developed by utilizing plasmon coupling between the Au nanostar and the Au nanohole array. Abstract : A surface-enhanced Raman scattering (SERS) biosensor has been developed by incorporating a gold nanohole array with a SERS probe (a gold nanostar@Raman-reporter@silica sandwich structure) into a single detection platform via DNA hybridization, which circumvents the nanoparticle aggregation and the inefficient Raman scattering issues. Strong plasmonic coupling between the Au nanostar and the Au nanohole array results in a large enhancement of the electromagnetic field, leading to amplification of the SERS signal. The SERS sensor has been used to detect Ag(i ) and Hg(ii ) ions in human saliva because both the metal ions could be released from dental amalgam fillings. The developed SERS sensor can be adapted as a general detection platform for non-invasive measurements of a wide range of analytes such as metal ions, small molecules, DNA and proteins in body fluids.