· manikkavalli mohan, nagaboopathy mohan, and dillip kumar chand (supporting information) fig. s1...
TRANSCRIPT
Self‐assembled gold nanofilms as simple recoverable and recyclable catalyst for nitro‐reduction
Manikkavalli Mohan, Nagaboopathy Mohan, and Dillip Kumar Chand
(Supporting information)
Fig. S1 TEM image taken for the AuNPs prepared in MeOH ‐water mixtures after 2 weeks of aging, and right side
histogram shows the particle size distribution.
Fig. S2 TEM image taken for the AuNPs prepared in EtOH‐water mixtures after 2 weeks of aging, inset is their
corresponding SAED pattern and right side histogram shows the particle size distribution
Fig. S3 TEM image taken for the AuNPs prepared in i‐PrOH ‐water mixtures after 2 weeks of aging, inset is their
corresponding SAED pattern and right side histogram shows the particle size distribution.
Fig. S4 TEM image taken for the AuNPs prepared in t‐BuOH‐water mixtures after 2 weeks of aging, inset is their
corresponding SAED pattern and right side shows the particle size distribution.
Fig. S5 UV‐vis spectra of AuNPs before and residual AuNPs present in aqueous phase after self‐assembly a) EtOH‐
H2O b) t‐BuOH‐ H2O, and FE‐SEM image of AuNPs prepared in (1:1) (c) EtOH‐H2O and (d) t‐BuOH‐H2O after
treatment with hexane for self‐assembly process and transferring AuNPs at the interface to Si wafer by dip coating
method
Fig. S6 TEM image of AuNFs prepared by using 0.5, 1, 1.5, 2 mM AuNPs in MeOH‐water.
Fig. S7 FE‐SEM and TEM image of AuNFs prepared by using 0.75 mM (above), 1.25 mM (middle) and 1.75 mM
(below) of AuNPs in MeOH‐water.
Fig. S8 AFM image of AuNFs prepared by using 1 mM AuNPs in MeOH‐water. (Vertical distances for the region of
blue, red and green lines shown in AFM image are 17, 15, 13 nm respectively).
Fig. S9 a) Normal XRD and b) Grazing incidence XRD of AuNFs prepared using 1mM AuNPs in water‐ MeOH.
Fig. S10 Plot of ln At/Ao Vs time (min)
Table S1 Rate constant for the catalytic reduction reaction of 4‐NP by Au nanofilms as catalyst (prepared from
various concentration of Au3+)
Fig. S11 Monitoring the catalytic reduction of 2‐nitrophenol by UV‐vis spectra.
Fig. S12 Monitoring the catalytic reduction of 3‐nitrophenol by UV‐vis spectra.
Fig.S13 Monitoring the catalytic reduction of 2‐nitroaniline by UV‐vis spectra.
Fig. S14 Monitoring the catalytic reduction of 4‐nitroaniline by UV‐vis spectra.
Fig. S15 1H NMR spectrum of 4‐aminophenol in DMSO‐d6
Fig. S16 1H NMR spectrum of 2‐aminophenol in DMSO‐d6
Fig. S17 1H NMR spectrum of p‐phenylenediamine in DMSO‐d6
Fig. S18 1H NMR spectrum of o‐phenylenediamine in CDCl3.
Fig. S19 1H NMR spectrum of 3‐aminophenol in CDCl3.
Electronic Supplementary Material (ESI) for Journal of Materials Chemistry A.This journal is © The Royal Society of Chemistry 2015
0 5 10 15 200
2
4
6
8
10
12
14
16
18
Frequen
cy count
Particle size (nm)
Fig. S1 TEM image taken for the AuNPs prepared in MeOH ‐water mixtures after 2 weeks of aging, and right side histogram shows the particle size distribution.
50 nm50 nm
10 1/nm10 1/nm
EtOH‐H2O
2 4 6 8 10 12 140
10
20
30
40
Freq
uen
cy Count
Particle SIze (nm)
Fig. S2 TEM image taken for the AuNPs prepared in EtOH‐water mixtures after 2 weeks of aging, inset is their corresponding SAED pattern and right side histogram shows the particle size distribution.
20 nm20 nm
10 1/nm10 1/nm
i‐PrOH‐H2O
0 4 8 12 16 20 240
10
20
30
40
50
60
Freq
uen
cy Count
Particle size (nm)
Fig. S3 TEM image taken for the AuNPs prepared in i‐PrOH ‐water mixtures after 2 weeks of aging, inset is their corresponding SAED pattern and right side histogram shows the particle size distribution.
20 nm20 nm
t‐BuOH‐H2O
10 1/nm10 1/nm
0 5 10 15 200
10
20
30
40
50
60
70
80
Freq
uen
cy count
Particle size (nm)
Fig. S4 TEM image taken for the AuNPs prepared in t‐BuOH‐water mixtures after 2 weeks of aging, inset is their corresponding SAED pattern and right side shows the particle size distribution.
a)
400 600 8000
1
2
3
Absorbance
Wavelength (nm)
EtOH‐H2O
After self‐assembly
b)
400 600 8000
1
2
3
Absorbance
Wavelength (nm)
t‐BuOH‐H2O
After self‐assembly
c) d)
Fig. S5 UV‐vis spectra of AuNPs before and residual AuNPs present in aqueous phase after self‐assembly a) EtOH‐ H2O b) t‐BuOH‐ H2O, and FE‐SEM image of AuNPs prepared in (1:1) (c) EtOH‐H2O and (d) t‐BuOH‐H2O after treatment with hexane for self‐assembly process and transferring AuNPs at the interface to Si wafer by dip coating method
300 nm 200 nm
50 nm50 nm
0.95nm
0.91nm
0.99nm
0.52nm0.98nm
100 nm100 nm
Fig. S6 TEM image of AuNFs prepared by using 0.5, 1, 1.5, 2 mM AuNPs in MeOH‐water.
Fig. S7 FE‐SEM and TEM image of AuNFs prepared by using 0.75 mM (above), 1.25 mM (middle) and 1.75 mM
(below) of AuNPs in MeOH‐water.
20 nm
200 nm
100 nm
Fig. S8 AFM image of AuNFs prepared by using 1 mM AuNPs in MeOH‐water. (Vertical distances for the region of blue, red and green lines shown in AFM image are 17, 15, 13 nm respectively).
a)
20 30 40 50 60 70 80 90
0
30
60
90
120
150
180
Intensity (a. u.)
2 (degree)
normal XRD AuNFs (1mM)Si wafer
Au (111)
b)
20 30 40 50 60 70 80 90
0
10
20
30
40
50
(222)
(311)(220)
(200)
Intensity (a. u.)
2 (degree)
Grazing incidence XRD AuNFs (1mM)
(111)
Fig. S9 a) Normal XRD and b) Grazing incidence XRD of AuNFs prepared using 1mM AuNPs in water‐MeOH.
Crystalline nature of the AuNFs was probed using powder XRD in a Riagaku powder machine. Intensity of Au
peaks under normal theta‐2theta mode was found to be in the range of background noise due to the thickness
(few ten nanometers). Hence, the orientations present in AuNF crystals were identified by using GIXRD mode. The
GIXRD pattern of 1mM AuNF is shown in Fig.S9 b. The peaks at 38°, 44°, 64°, 77° and 81°were indexed to the
planes (111), (200), (220), (311) and (222) of fcc Au lattice. Same characteristics was observed for rest of the
samples as well (not shown here).
0 5 10 15 20 25 30‐2.0
‐1.5
‐1.0
‐0.5
0.0
ln At/Ao
Time (min)
0.5 mM Au‐cat‐4NP
0.75 mM Au‐cat‐4NP
1 mM Au‐cat‐4NP
1.25 mM Au‐cat‐4NP
1.5 mM Au‐cat‐4NP
1.75 mM Au‐cat‐4NP
2 mM Au‐cat‐4NP
Fig. S10 Plot of ln At/Ao Vs time (min)
Table S1 Rate constant for the catalytic reduction reaction of 4‐NP by Au nanofilms as catalyst (prepared from
various concentration of Au3+)
1 mL of AuNPs at
concentration (mM)
Rate constant,
k (s‐1)
0.5 9.96x10‐4
0.75 1.00x10‐3
1 6.47x10‐4
1.25 7.7x10‐4
1.5 6.49x10‐4
1.75 7.38x10‐4
2 6.85x10‐4
300 400 500
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Absorbance (a. u)
Wavelength (nm)
Blank o‐NP
1min
3min
5min
7min
10min
12min
15min
17min
20min
22min
Fig. S11 Monitoring the catalytic reduction of 2‐nitrophenol by UV‐vis spectra.
200 300 400 500
0
1
2
3
Absorbance
Wavelength (nm)
m‐NP
m‐NP 1 min
3 min
5 min
7 min
10 min
13 min
15 min
20 min
Fig. S12 Monitoring the catalytic reduction of 3‐nitrophenol by UV‐vis spectra.
300 400 5000.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Absorban
ce
Wavelength (nm)
12min
14min
17min
20min
22min
24min
26min
28min
30min
34min
38min
Blank o‐NA
1min
3min
5min
7min
9min
10min
Fig.S13 Monitoring the catalytic reduction of 2‐nitroaniline by UV‐vis spectra.
300 400 500
1
2
3
4 15min
17min
20min
22min
25min
27min
Absorbance
Wavelength (nm)
p‐Nitroaniline
1min
3min
5min
7min
10min
12min
Fig. S14 Monitoring the catalytic reduction of 4‐nitroaniline by UV‐vis spectra.
Fig. S15 1H NMR spectrum of 4‐aminophenol in DMSO‐d6
Fig. S16 1H NMR spectrum of 2‐aminophenol in DMSO‐d6
Fig. S17 1H NMR spectrum of p‐phenylenediamine in DMSO‐d6
Fig. S18 1H NMR spectrum of o‐phenylenediamine in CDCl3.
Fig. S19 1H NMR spectrum of 3‐aminophenol in CDCl3.