Post on 02-Feb-2016
description
Figure Captions
Fig.S1. (A) Schematic Representation of graphene and characterization using (B) TEM, (C) UV, (D) FTIR and (E) Raman spectroscopy.
Fig.S2. Isotopic pattern of peak at m/z 472 and 488 (Monoisotopic mass), inset represent the simulated pattern of the two peaks, respectively.
Fig. S3 . GALDI response to various metal ions ( A) and in presence of Hg2+(B). Metals: T were mixed in molar ratio 1:2.
m/z Assignments
23 Na+
39 K+
126 [T+H]+
149 [T+Na]+
165 [T+K]+
472 [Hg(T)2(H2O)+H]+
488 [Hg(T)2(H2O)2+H]+
Table S1: Peaks assignments of GALDI-MS
290 300 310 320 330 340 3500
2
4
6
8A
bsor
ptio
n
Wavelength, nm
Graphene
1.Oxidation (H2SO4, KMnO4, H2O2)
2.Reduction (NH2NH2)
Fig.S1
A
B C
D E
1000 1500 2000 2500 3000
150
200
250
300
350
400
Inte
nsi
ty a
.u.
Raman shift,cm-1
Fig.S2
Molecular formula:
C10H14HgN4O5
Molecular weight:
470.841
Monoisotopic mass:
472.067
Number lines: 90
Molecular formula:
C10H16HgN4O6
Molecular weight:
488.85682
Monoisotopic mass:
490.0776
Number lines: 95
450 455 460 465 470 475 480 485 490 495 500
0
10000
20000
30000
40000
Inte
nsity
m/z
1
2
1
2
790 795 800 805 810 815 820 825 830 835 840 845 8500
1000
2000
3000
Inten
sity
m/z
Fig.S3
Th
ym
ine
(1)
Hg2+
(2)
1+
2+
Cd
2+
1+
2+
Cu
2+
1+
2+
Ni2
+
1+
2+
Zn
2+
1+
2+
Fe2
+
1+
2+
Fe3
+
0.0
0.2
0.4
0.6
0.8
1.0
Rel
ati
ve
MA
LD
I In
ten
sity
(m
/z 4
88)
Thymine Hg2+ Cd2+ Cu2+ Ni2+ Zn2+ Fe2+ Fe3+ --
0.0
0.2
0.4
0.6
0.8
1.0
Rel
ati
ve
MA
LD
I In
ten
sity
Fig.S4 A
B