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Supplementary Information

Ice-templating synthesis of macroporous noble metals /3D-graphene nanocomposites: their fluorescence lifetime and catalytic study

Prasanta Kumar Sahooa,b*, Bharati Panigrahyc, Dinbandhu Thakurb and Dhirendra Bahadurb*

aDepartment of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai-400076, IndiabCentre for Nano Science and Nano Technology, Siksha ‘O’ Anusandhan University, Bhubaneswar 751030, OdishacSolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560012, India

*Corresponding Authors:

1. Prof. Dhirendra Bahadur, FRSCDept. of Metallurgical Engineering and Materials ScienceIndian Institute of Technology BombayPowai, Mumbai-400076, IndiaPh: 91-22-25767632, Fax: 91-22-25723480Email: dhirenb@iitb.ac.in

2. Prof. Prasanta Kumar SahooCentre for Nano Science and Nano Technology, Siksha ‘O’ Anusandhan University, Bhubaneswar 751030, Odisha, India Ph: 91-67-42350181, Fax: 91-67-42351880Email: prasantakumarsahoo@soauniversity.ac.in

Electronic Supplementary Material (ESI) for New Journal of Chemistry.This journal is © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2017

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Table S1 Comparison of 2θ values of (111) plane of Pt, Pd and Au in NM/3D-graphene

nanocomposites with Joint Committee on Powder Diffraction Standards (JCPDS) data.

Planes 2θ (Degree)Pt (111) (Pt/3D-graphene)

Pt (111) (JCPDS 00-004-0802)

39.6

39.8Pd (111) (Pd/3D-graphene)

Pd (111) (JCPDS 00-005-0681)

39.7

40.1Au (111) Au/3D-graphene

Au (111) (JCPDS 00-004-0784)

38.1

38.2

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Fig.S1 Raman spectra of (a) GO, (b) Au/3D-graphene, (c) Pd/3D-graphene, and (d) Pt/3D-

graphene nanocomposites.

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Fig.S2 (i) FTIR spectra of (a) GO, (b) Au/3D-graphene, (c) Pd/3D-graphene, and (d) Pt/3D-graphene

nanocomposites; (ii) The C=O stretching vibration and (iii) O-H deformation vibration of of (a) GO, (b)

Au/3D-graphene, (c) Pd/3D-graphene, and (d) Pt/3D-graphene nanocomposites.

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Fig.S3 O 1s XPS spectra of (a) GO, (b) Au/3D-graphene, (c) Pd/3D-graphene, and (d) Pt/3D-

graphene nanocomposites.

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(a)

(b)

(c)

Fig.S4 Energy dispersive X-ray spectroscopy (EDS) spectra of (a) Au/3D-graphene (b)

Pd/3D-graphene and Pt/3D-graphene nanocomposites.

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Au

C

O

Au/3D-graphene

C

O

Pd

C

O

Pt

Pd/3D-graphene Pt/3D-graphene

Fig.S5 EDS elemental mapping images of Au/3D-graphene, Pd/3D-graphene and Pt/3D-

graphene nanocomposites.

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240 320 400 480 560 640

(b)

Intn

sity

(a.u

.)

Wavelength (nm)

UV (3D-graphene) PL (3D-graphene)(a)

Fig.S6 (a) UV-vis absorption and (b) photoluminescence spectra of GO sheets.

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Fig.S7 UV-vis absorption spectra of 4-NP reduction by NaBH4 in the presence of (a) Au/3D-

graphene (b) Pd/3D-graphene, and (c) Pt/3D-graphene nanocomposites.

Fig.S8 (a) UV-vis absorption spectra of the reduction of 4-NP by NaBH4 in the presence of

RGO/Pt nanocomposite. (b) Plot of ln Ct/C0 versus time for the kinetic study of the reduction

reaction of 4-NP in the presence of RGO/Pt nanocomposite.

250 300 350 400 450 500 550

0.0

0.2

0.4

0.6

0.8

1.0RGO/Pt

Abso

rban

ce (a

.u)

Wave length (nm)

0 min 5 min10 min15 min20 min25 min30 min

(a)

0 5 10 15 20 25 30-1.2

-1.0

-0.8

-0.6

-0.4

-0.2

0.0ln

(Ct/C

0)

Time (min)

(b)

k = 33.6 x 10-3 min-1

R2 = 0.9938

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Fig.S9 UV-vis absorption spectra of MB reduction by NaBH4 in the presence of (a) Au/3D-

graphene (b) Pd/3D-graphene, and (c) Pt/3D-graphene nanocomposites.

Fig. S10 UV-vis absorption spectrum of MB in presence of (a) Pt/3D-graphene and (b)

RGO/Pt nanocomposites as catalysts without NaBH4.

450 500 550 600 650 700 7500.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

0 min3 min6 min9 min12 min15 min18 min21 min24 min27 min30 min

Abso

rban

ce (a

.u)

Wavelength (nm)

(b)

450 500 550 600 650 700 7500.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.00 min3 min6 min9 min12 min15 min18 min21 min24 min27 min30 min

Abso

rban

ce (a

.u)

Wavelength (nm)

0 3 6 9 12 15 18 21 24 27 30

(a)

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Table S2 Comparison of the catalytic performances of the Pt/3D-graphene nanocomposite

for the reduction of 4-NP with other reported catalysts.

Catalysta Rate constant

(x10-3. min-1)

Ref.

4-NP Dendritic Pt 45 1

Pt nanoflowers 42 2

Pt/γ-alumina 32 3

SiO2/Pt 44 4

RGO/Pt 13.7 5

Pt-NCs/RGO 54.5 6

RGO/Pt-Ni 35.5 5

Pt–Au pNDs/RGOs 3.8 7

Pt/3D-graphene 75.3 This work

aRGO: Reduced graphene oxide; NCs: nanocubes; pNDs: Porous nanodendrites.

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