Electronic Supplementary Material
A luminescence enhancement method for the immediate determination of vitamin B1 using
long-wavelength emission water-soluble CdTe nanorods
2500
A
1.5h, 5.5h, 12h, 24h
2000
1500
1000
500
0
480
560
640
Wavelength (nm)
720
Luminescence intensity (a.u)
Luminescence intensity (a.u)
Yan Li, Peng Wang, Xin Wang, Ming Cao, YunSheng Xia, Chun Cao, MeiGui Liu, ChangQing Zhu*
Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui
Normal University, Wuhu, 241000, P. R. China. E-mail: zhucq@mail.ahnu.edu.cn;
3000
CdTe nonarods + VB
1
B
CdTe nonarods
2500
2000
1500
1000
500
0
480
540
600
660
720
780
Wavelength (nm)
Fig. S-1 (A) Luminescence spectrum of four CdTe nanorods obtained at pH 11 after
different refluxing time, (B) Luminescence enhancement effects for various CdTe
nanorods upon addition of 2.0 μmol L-1 vitamin B1 at pH 10.83 with the emission
maximum wavelength of CdTe nanorods (from left to right) at 550, 600, 665 and 720 nm,
respectively, The molar ratio of Cd2+:TGA:Cys:HTe− of the nanorods used is set at
1:1.8:0.6:0.5.
Counts
B
A
A
0
200
400
600
800
1000
Time (ns)
Fig. S-2 Luminescence decay curves of CdTe nanorods with the emission wavelength of
665 nm at pH 10.83 in the absence (A) and presence (B) of 2.0 μmol L-1 vitamin B1. The
measurements were performed at room temperature with the excitation and emission
wavelength at 530 nm and 665 nm, respectively. The molar ratio of Cd2+:TGA:Cys:HTe−
2000
(I0)
1600
220
A
(I)
(I- I0)
B
200
1200
I - I0
Luminescence intensity (a.u)
of the nanorods used is set at 1:1.8:0.6:0.5.
800
180
400
160
0
6
8
10
pH
12
14
0
5
10
15
20
25
-3
Na2CO3-NaHCO3 (1×10 M)
Fig. S-3 Effect of pH (A) and the concentration of buffer solution (B) on luminescence
enhancement. [CdTe]= 1.0×10-5 mol L-1, [VB1] = 2.0 μmol L-1. The excitation and
emission wavelengths are 530 nm and 665 nm, respectively.
Table S-1 Interference of some coexisting substances
Coexisting substances
Molar ratio to thiamine
Relative error (%)
Ca2+
7.5
-4.8
Zn2+
22.5
-3.9
Pb2+
38
-4.78
Mg2+
15
-4.06
K+, I-
35
-3.7
Al3+
14
-3.1
Cu2+, Mn2+
0.25
-4.7
Hg2+
0.03
-4.8
Glycine
25
-4.6
Glutamic acid
25
-4.9
Vitamin C
4
-4.0
Riboflavin
2
-2.9
Nicotinic acid
150
-3.4
Pyridoxine hydrochloride
25
-4.3
Folic acid
2
-3.7
Tartaric acid
7.5
-4.6
Biotin
10
-3.9