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. 2020 Jan 17;10(6):3137-3144.
doi: 10.1039/c9ra10372d. eCollection 2020 Jan 16.

Gum acacia-based silver nanoparticles as a highly selective and sensitive dual nanosensor for Hg(ii) and fluorescence turn-off sensor for S2- and malachite green detection

Ambreen Abbasi  1 , Summaiya Hanif  1 , Mohammad Shakir  1
Affiliations

Gum acacia-based silver nanoparticles as a highly selective and sensitive dual nanosensor for Hg(ii) and fluorescence turn-off sensor for S2- and malachite green detection

Ambreen Abbasi et al. RSC Adv. .

Abstract

A facile and green method was adopted to synthesize highly selective gum acacia-mediated silver nanoparticles as dual sensor (fluorescence turn-on and colorimetric) for Hg(ii) and fluorescence turn-off sensor for S2- and malachite green. The mechanism proposed for a dual response towards Hg(ii) is the redox reaction between Ag(0) and Hg(ii), resulting in the formation of Ag(i) and Hg(0) and electron transfer from gum acacia to Ag(i), which further leads to the formation of an Ag@Hg nanoalloy. The enhanced fluorescence signal was quenched selectively by S2- owing to the formation of Ag2S and HgS. The reported nanosensor was found to be useful for sensing malachite green via the inner filter effect. The linear ranges were 3 nmol L-1 to 13 μmol L-1 for Hg(ii), 3-170 μmol L-1 for S2- and 7-80 μmol L-1 for malachite green, and the corresponding detection limits were 2.1 nmol L-1 for Hg(ii), 1.3 μmol L-1 for S2- and 1.6 μmol L-1 for malachite green.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. The FT-IR spectrum of Gum Acacia (GA) (black), GA-capped AgNPs (red), and GA-capped AgNPs in the presence of 100 nmol L−1 Hg(ii) ions (blue).
Fig. 2
Fig. 2. SEM images of GA-AgNPs (A), GA-AgNPs in the presence of 100 nmol L−1 Hg(ii) (B) and GA-AgNPs in the presence of 100 nmol L−1 and 30 μmol L−1 S2− ions (C). Insets of (A) and (B) give the EDX image.
Fig. 3
Fig. 3. TEM image of GA-AgNPs alone (A) and GA-AgNPs in the presence of 100 nmol L−1 Hg(ii) ions (B). Insets give the size distribution histogram.
Fig. 4
Fig. 4. (a) Fluorescence turn-on response of GA-AgNPs in the presence of an increasing concentration of Hg(ii) [3 nmol L−1 to 13 μmol L−1]; (b) calibration curve showing fluorescence enhancement linearity.
Fig. 5
Fig. 5. (a) Fluorescence turn-off response of the GA-AgNPs–Hg(ii) ensemble in the presence of an increasing concentration of S2− [3–170 μmol L−1]; (b) the relative fluorescence intensity at 567 nm against S2−.
Fig. 6
Fig. 6. (a) Fluorescence turn-off response of GA-AgNPs in the presence of an increasing concentration of MG [7–130 μmol L−1]; (b) the relative fluorescence intensity at 567 nm against MG in the concentration range 7–80 μmol L−1.
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