Size-Controllable Gold Nanopores with High SERS Activity

Hai Ling Liu, Jiao Cao, Sumaira Hanif, Chunge Yuan, Jie Pang, Rastislav Levicky, Xing Hua Xia, Kang Wang

Research output: Contribution to journalArticle

Abstract

Nanopore structures have been successfully employed in next-generation DNA sequencing. For more complicated protein which normally contains 20 different amino acids, identifying the fluctuation of ionic current caused by different amino acids appears inadequate for protein sequencing. Therefore, it is highly desirable to develop size-controllable nanopores with optical activity that can provide additional structural information. Herein, we discovered the novel nanopore properties of the self-assembled ultramicroelectrodes originally developed by Bard and co-workers. Using a slightly modified method, the self-assembly of 7 ± 1 nm gold nanoparticles (AuNPs) can be precisely controlled to form a gold nanoporous sphere (GPS) on the tip of a glass capillary. Different dithiol linker molecules (1,3-propanedithiol, C3; 1,6-hexanedithiol, C6; and 1,9-nonanedithiol, C9) reproducibly led to rather similar nanopore sizes (5.07 ± 0.02, 5.13 ± 0.02, and 5.25 ± 0.01 nm), respectively. The GPS nanostructures were found to exhibit high ionic current rectification as well as surface-enhanced Raman scattering (SERS) activity due to the presence of nanopores and numerous "hot spots" among the cross-linked AuNPs on the surface of GPS. The rectification effect of the small nanopores was observed even under high concentration of electrolyte (290 mM), along with SERS enhancement factors well above 1 × 105. The GPS nanostructures were successfully applied for SERS-based detection of glutathione from a single HeLa cell.

Original languageEnglish (US)
Pages (from-to)10407-10413
Number of pages7
JournalAnalytical Chemistry
Volume89
Issue number19
DOIs
StatePublished - Oct 3 2017

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Nanopores
Gold
Raman scattering
Nanostructures
Amino Acids
Self assembly
Electrolytes
Glutathione
Proteins
Nanoparticles
Glass
Molecules
DNA

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Liu, H. L., Cao, J., Hanif, S., Yuan, C., Pang, J., Levicky, R., ... Wang, K. (2017). Size-Controllable Gold Nanopores with High SERS Activity. Analytical Chemistry, 89(19), 10407-10413. https://doi.org/10.1021/acs.analchem.7b02410

Size-Controllable Gold Nanopores with High SERS Activity. / Liu, Hai Ling; Cao, Jiao; Hanif, Sumaira; Yuan, Chunge; Pang, Jie; Levicky, Rastislav; Xia, Xing Hua; Wang, Kang.

In: Analytical Chemistry, Vol. 89, No. 19, 03.10.2017, p. 10407-10413.

Research output: Contribution to journalArticle

Liu, HL, Cao, J, Hanif, S, Yuan, C, Pang, J, Levicky, R, Xia, XH & Wang, K 2017, 'Size-Controllable Gold Nanopores with High SERS Activity', Analytical Chemistry, vol. 89, no. 19, pp. 10407-10413. https://doi.org/10.1021/acs.analchem.7b02410
Liu, Hai Ling ; Cao, Jiao ; Hanif, Sumaira ; Yuan, Chunge ; Pang, Jie ; Levicky, Rastislav ; Xia, Xing Hua ; Wang, Kang. / Size-Controllable Gold Nanopores with High SERS Activity. In: Analytical Chemistry. 2017 ; Vol. 89, No. 19. pp. 10407-10413.
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