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Issue 9, 2014
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The controlled fabrication of “Tip-On-Tip” TERS probes

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Tip-enhanced near-field Raman spectroscopy has exhibited a great ability to detect in situ chemical and structural information on a sample surface with the highest lateral resolution combined with a high sensitivity at the same time. A key challenge in the TERS field is the development and improvement of the fabrication of reproducible metal tip geometries with a sharper apex. In this study, one novel apertureless “Tip-On-Tip” TERS probe with a special plasmonic nanostructure is designed, and a simple Ar+-ion sputtering route has been developed to fabricate silver nanoneedle arrays on the scanning probe microscopy (SPM) cantilevers for tip-enhanced Raman spectroscopy (TERS) probes. These silver nanoneedles possess a very sharp apex with an apex diameter of 15 nm and an apex angle of 20°. The novel TERS probes exhibit enhanced near-field Raman signals compared to an Ag-coated SPM probe, which are attributed to the intense electromagnetic field around the apexes of the Ag nanoneedles and the periodic structure of the Ag nanoneedles.

Graphical abstract: The controlled fabrication of “Tip-On-Tip” TERS probes

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Publication details

The article was received on 21 Aug 2013, accepted on 11 Nov 2013 and first published on 11 Nov 2013

Article type: Paper
DOI: 10.1039/C3RA44532A
RSC Adv., 2014,4, 4718-4722

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    The controlled fabrication of “Tip-On-Tip” TERS probes

    Y. Yang, Z. Li, M. Nogami, M. Tanemura and Z. Huang, RSC Adv., 2014, 4, 4718
    DOI: 10.1039/C3RA44532A

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