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. 2019 Jul 18;4(7):12319-12324.
doi: 10.1021/acsomega.9b01574. eCollection 2019 Jul 31.

In Situ Surface-Enhanced Raman Spectroscopy Detection of Uranyl Ions with Silver Nanorod-Decorated Tape

Affiliations

In Situ Surface-Enhanced Raman Spectroscopy Detection of Uranyl Ions with Silver Nanorod-Decorated Tape

Jiaolai Jiang et al. ACS Omega. .

Abstract

Surface-enhanced Raman spectroscopy (SERS) has been utilized for rapid analysis of uranyl ions (UO2 2+) on account of its fast response and high sensitivity. However, the difficulty of fabricating a suitable SERS substrate for in situ analysis of uranyl ions severely restricts its practical application. Hence, we proposed flexible and adhesive SERS tape decorated with silver nanorod (AgNR) arrays for in situ detection of UO2 2+. The SERS tape was fabricated through a simple "paste & peel off" procedure by transferring the slanted AgNR arrays from silicon to the transparent tape surface. UO2 2+ can be easily in situ detected by placing the AgNR SERS tape into an aqueous solution or pasting it onto the solid matrix surface due to the excellent transparent feature of the tape. The proposed SERS tape with well-distributed AgNRs effectively improved the reproducibility and sensitivity for UO2 2+ analysis. UO2 2+ with concentration as low as 100 nM was easily detected. Besides, UO2 2+ adsorbed on an iron disc and rock surface also can be rapidly in situ detected. With its simplicity and convenience, the AgNR SERS tape-based SERS technique offers a promising approach for environmental monitoring and nuclear accident emergency detection.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Scheme 1
Scheme 1. Schematic Illustration of the AgNR SERS Tape Fabrication and in Situ Detection of Uranyl Ions in Aqueous Solution
Figure 1
Figure 1
Feasibility of the AgNR SERS tape for in situ detection of uranyl ions in aqueous solution: (a) normal Raman spectrum of solid uranyl nitrate, (b) SERS of the water showing no signal, and (c) SERS of the 10–3 M uranyl nitrate aqueous solution showing a strong signal at 730–790 cm–1.
Figure 2
Figure 2
(a) Top-view SEM image of the AgNR substrate, (b) high-resolution SEM image of (a), (c) side-view SEM image of (a), (d) top-view SEM image of AgNR SERS tape, and (e) high-resolution SEM image of (d).
Figure 3
Figure 3
(a) Concentration-dependent SERS spectra of uranyl ions by AgNR SERS tape. (b) Intensity variation of the uranyl ion symmetric stretching band (centered at 730–780 cm–1, subtracted with the blank signal) with respect to the logarithm value of its concentration.
Figure 4
Figure 4
Comparative normal Raman and SERS spectra of uranyl nitrate solution. The exposure time is 10 s for Raman and 1 s for SERS.
Figure 5
Figure 5
Selectivity of the AgNR SERS tape for UO22+: 10 μM UO22+; 100 μM Cd2+, Na+, Ca2+, Cu2+, Fe2+, Ni2+, and Zn2+.
Figure 6
Figure 6
SERS spectrum of 10–5 M uranyl ions in tap water by the AgNR SERS tape technique.
Figure 7
Figure 7
In situ SERS spectra of uranyl ions adsorbed on the (a) iron disc and (b) rock surface.

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