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Supplementary Information
Selective and colorimetric detection of Ba2+ ions in aqueous solutions using 11-mercaptoundecylphosphonic acid functionalized gold nanoparticles
Blanca A. García Grajeda,a Samuel G. Soto Acosta,a Sergio A. Aguila,b Héctor Peinado Guevara,a Marta E. Díaz-García,c Adriana Cruz Enríqueza* and José J. Campos-Gaxiolaa*
aFacultad de Ingeniería Mochis, Universidad Autónoma de Sinaloa, Fuente de Poseidón y Prol. A. Flores S/N, C.P. 81223, C.U. Los Mochis, Sinaloa, México. E-Mail: [email protected] and [email protected]; Fax: (52) 668 8127641; Tel: (52) 668 8127641.
bCentro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México (CNyN-UNAM), Km. 107 CarreteraTijuana-Ensenada, Apartado Postal 14, C.P. 22800, Ensenada, Baja California, México.
cDepartment of Physical and Analytical Chemistry, University of OviedoJulián Clavería no. 8 primera planta c.p. 33006, Oviedo, Spain.
CONTENTS
Fig. S1. Absorbance ratio (A625/A530) of AuNPs-MPA in the presence of metal ions. Blue bars represent the addition of single metal ion (100 µM); red bars represent the mixture of Ba2+ (100 µM) with another metal ion (100 µM). ...............................................................................................2Fig. S2. IR spectra (a) Functionalized AuNPs-MPA and (b) AuNPs-MPA detecting Ba2+ ions. .............2Fig. S3. Uv-vis spectra of (-) AuNPs-citrate and (-) AuNPs-citrate-Ba2+. ..............................................3Fig. S4. TEM image of AuNPs-MPA evaluated at pH 3. .......................................................................3Fig. S5. Effect of reaction time on the absorption ratio A625/A530 for AuNPs-MPA system in the presence of various concentrations of Ba2+…………………………………………………………………………………….4Fig. S6. UV-vis spectra of AuNPs-MPA detecting Ba2+ ions in (A) drinking water and (B) tap water………………………………………………………………………………………………………………………………………………5Fig. S7.Colorimetric response of (A) drinking water and (B) tap water………………………………………….5Fig. S8. The linearity curve of the ratio of A625/A530 versus Ba2+ concentration (A) drinking water and (B) tap water……………………………………………………………………………………………………………………………6
Electronic Supplementary Material (ESI) for RSC Advances.This journal is © The Royal Society of Chemistry 2017
2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
A62
5/A53
0
Ba2+ Li
+
Na+
K+
Mg2+
Ca2+
Sr2+
Mn2+
Fe2+
Co2+
Ni2+
Cu2+
Zn2+
Cd2+
Hg2+
Sb3+
Bi3+
Fig. S1. Absorbance ratio (A625/A530) of AuNPs-MPA in the presence of metal ions. Blue bars represent the addition of single metal ion (100 µM); red bars represent the mixture of Ba2+ (100 µM) with another metal ion (100 µM).
Fig. S2. IR spectra (a) Functionalized AuNPs-MPA and (b) AuNPs-MPA detecting Ba2+ ions.
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Fig. S3.Uv-vis spectra of (-) AuNPs-citrate and (-) AuNPs-citrate-Ba2+.
Fig. S4. TEM image of AuNPs-MPA evaluated at pH 3.
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Fig. S5. Effect of reaction time on the absorption ratio A625/A530 for AuNPs-MPA system in the presence of various concentrations of Ba2+.
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400 500 600 700 8000.0
0.1
0.2
0.3
0.4
0.5
0.6
AuNPs AuNPs+500 L AuNPs+1000 L AuNPs+1500 L AuNPs+2000 L AuNPs+3000 L
Abso
rban
ce a.
u.
Wavelength (nm)
400 500 600 700 800
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
AuNPs AuNPs+500 L AuNPs+1000 L AuNPs+1500 L AuNPs+2000 L AuNPs+3000 L
Wavelength (nm)
Abso
rban
ce a.
u.
(A)
(B)
Fig. S6. UV-vis spectra of AuNPs-MPA detecting Ba2+ ions in (A) drinking water and (B) tap water.
0 µM200 100 203050607090300
0 µM120200300 100 203050607090150170190
(A)
(B)
Fig. S7.Colorimetric response of (A) drinking water and (B) tap water.
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y = 0.7727x + 0.0943R² = 0.9577
0.0000
0.2000
0.4000
0.6000
0.8000
1.0000
0 0.2 0.4 0.6 0.8 1 1.2A
625/A
530
Concentration of Ba2+ (µ M)
y = 0.2416x + 0.2488R² = 0.9738
0.0000
0.1000
0.2000
0.3000
0.4000
0.5000
0.6000
0 0.2 0.4 0.6 0.8 1 1.2 1.4
A62
5/A53
0
Concentration of Ba2+ (µM)
(A)
(B)
Fig. S8. The linearity curve of the ratio of A625/A530 versus Ba2+ concentration (A) drinking water and (B) tap water.
