Abstract
A taper-fiber SERS nanoprobe modified by gold nanoparticles (Au-NPs) with ultrathin alumina layers was fabricated and its ability to perform remote Raman detection was demonstrated. The taper-fiber nanoprobe (TFNP) with a nanoscale tip size under 80 nm was made by heated pulling combined with the chemical etching method. The Au-NPs were deposited on the TFNP surface with the electrostatic self-assembly technology, and then the TFNP was wrapped with ultrathin alumina layers by the atomic layer deposition (ALD) technique. The results told us that with the increasing thickness of the alumina film, the Raman signals decreased. With approximately 1 nm alumina film, the remote detection limit for R6G aqueous solution reached 10−6 mol/L.
Highlights
Serving as an attractive analytical spectral technique, Raman spectroscopy provides a “fingerprint”of information of molecular structures [1,2]
For each spectrum the baseline is the broken line composed of a series of segments, which is obtained by connecting the two lowest points of each Raman peak [32]
We proposed a nanoscale taper-fiber SERS probe structure modified by Au-NPs wrapped with
Summary
Serving as an attractive analytical spectral technique, Raman spectroscopy provides a “fingerprint”. Noble metal coated with metal oxide layers at high temperatures fortoan extended period of time without their enhancement capabilities were reported to be able suppress metal surface reactions withlosing air, and preserve their morphology at [25,26,27,28]. These coated structures be applied complex environment detectioncapabilities and survive with high temperatures for an extendedcan period of time to without losing their enhancement long-term stability [29,30].
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