Supporting Information for
Label−Free Fluorescence Sensing of Lead(II) Ions and Sulfide Ions Based on
Luminescent Molybdenum Disulfide Nanosheets
Yong Wang,1,* Jie Hu,1 Qianfen Zhuang,1 and Yongnian Ni1,2,*
1
2
College of Chemistry, Nanchang University, Nanchang, Jiangxi 330031, China
State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi
330047,China
* Corresponding author. Telephone +86 791 83969500. Fax: +86 791 83969500.
E-mail address: [email protected]; [email protected]
S1
1. TEM images of the fluorescent MoS2 nanosheets with Pb2+ alone and the mixture of Pb2+ and S2-
(a)
(b)
200 nm
200 nm
Figure S1. TEM images of the fluorescent MoS2 nanosheets with (a) Pb2+ alone and (b) the mixture of Pb2+ and S2-.
S2
2. Series of data of deconvoluted results of XPS spectra for the fluorescent MoS2 nanosheets
(a)
(b)
Figure S2. XPS spectra of (a) S 2p and (b) Mo 3d for the fluorescent MoS2 nanosheets.
S3
3. Identification for sulfate ions in a typical hydrothermal synthesis process of the fluorescent MoS2 nanosheets
Figure S3. Optical photographs of (a) the supernatant from hydrothermal synthesis of the fluorescent MoS2 nanosheets,
(b) the supernatant after adding barium chloride, and (c) the supernatant after adding barium chloride and hydrochloric
acid.
S4
4. Series of data of deconvoluted results of XPS spectra for the fluorescent MoS2 nanosheets with Pb2+
Figure S4. XPS spectra of (a) Pb 4f, (b) S 2p, and (c) Mo 3d for the fluorescent MoS2 nanosheets with Pb2+.
S5
5. Series of data of deconvoluted results of XPS spectra for the fluorescent MoS2 nanosheets with Pb2+ and S2-
Figure S5. XPS spectra of (a) Pb 4f, (b) S 2p, and (c) Mo 3d for the fluorescent MoS2 nanosheets with Pb2+ and S2-.
S6
6. Fluorescence spectra of RGO, RGO with Pb2+, and RGO with Pb2+ and S2-
Figure S6. Fluorescence spectra of RGO alone, the mixture of RGO with Pb2+, and the mixture containing RGO and
Pb2+ after the addition of S2-.
S7
Table S1. Determination of Pb2+ Spiked in Water Samples (n=3)
_________________________________________________________________________________
samples
added
mean found
mean recovery
RSD
(%)
(μM)
(μM)
(%)a
_________________________________________________________________________________
1
2.0
2.1
105
9.0
2
4.0
4.2
105
1.3
3
6.0
6.0
100
7.0
4
8.0
7.7
96
4.9
_________________________________________________________________________________
a
Recovery (%) = 100 × (cmean found/cadded).
Table S2. Determination of S2- Spiked in Water Samples (n=3)
_________________________________________________________________________________
samples
added
mean found
mean recovery
RSD
(%)
(μM)
(μM)
(%)a
_________________________________________________________________________________
1
2.0
1.9
95
7.0
2
4.0
4.4
110
7.2
3
6.0
6.2
103
7.7
4
8.0
7.9
99
9.7
_________________________________________________________________________________
a
Recovery (%) = 100 × (cmean found/cadded).
S8