Shape-Defined Nanodimers by Tailored Heterometallic

Epitaxy

Carlos A. García-Negretea,*, Teresa C. Rojasa, Benjamin R. Knappettb, David A.

Jeffersonb, Andrew E. H. Wheatleyb, Asunción Fernándeza

aInstituto de Ciencia de Materiales de Sevilla (CSIC e Univ. Sevilla), Avda. Américo

Vespucio nr. 49, CIC Cartuja, 41092 Sevilla, Spain

bDepartment of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2

1EW, UK

* Email: carlos.garcia@icmse.cisc.es or cagarcian@unal.edu.co

Supplementary information

Figure S1. Representative TEM image of HDs obtained at room temperature for 120h.

Electronic Supplementary Material (ESI) for Nanoscale.This journal is © The Royal Society of Chemistry 2014

Figure S2. Representative TEM image of cubeoctahedrally-derived HDs obtained

through reaction at 60 ºC for 5h

Figure S3. Representative TEM image of the sample composed of octahedrally-derived

HDs as well as the two different products highlighted in the image.

HDs comprising two Au domains linked by one octahedral Pt domain

Icosahedrally-derived HDs

Figure S4. Representative HRTEM image of icosahedrally-derived HDs

Size measurements

The sizes of Pt seeds and HDs were analysed using Gatan Digital Micrograph software by examining at least 100 particles from several TEM images. HD sizes were measured separately for each domain type in order to notice possible size changes with respect to the initial Pt seed. Data was then used to construct particle size distributions with OriginPro 8.0.

Table S1. Average domain sizes in different Au-Pt HDs and Pt seeds

Pt domain Au domainSample Size (nm) Standard

deviationSize (nm) Standard

deviationCubeoctahedra seed 4.40 0.60Octahedra seed 11.2 1.0Octapods seed 12.5 1.0Cubectahedrally- derived HDs 4.67 0.74 8.39 1.4Octahedrally- derived HDs 12.5 2.0 16.0 2.4Octapodally-derived HDs 12.3 1.6 14.1 3.2

Size distributions

3,0 3,5 4,0 4,5 5,0 5,5 6,0 6,505

1015202530354045

Coun

ts

Size (nm)

Cubeoctahedra seed

8 9 10 11 12 130

5

10

15

20

25

Coun

ts

Size (nm)

Octahedra seed

10 11 12 13 140

5

10

15

20

Coun

ts

Size (nm)

Octapods Seed

3 4 5 6 70

5

10

15

20

25

30

Coun

ts

Size (nm)

Cubectahedrally- derived HDs_Pt domain

4 6 8 10 120

5

10

15

20

25

30

35

40

Coun

ts

Size (nm)

Cubectahedrally- derived HDs_Au domain

8 10 12 14 160

5

10

15

20

25

30

Coun

ts

Size (nm)

Octahedrally- derived HDs_Pt domain

10 12 14 16 18 200

5

10

15

20

25

30

Coun

ts

Size (nm)

Octahedrally- derived HDs_Au domain

8 10 12 14 160

5

10

15

20

25

Coun

ts

Size (nm)

Octapodally-derived HDs_Pt domain

8 10 12 14 16 18 20 22 24 26 280

5

10

15

20

25

30

Coun

ts

Size (nm)

Octapodally-derived HDs_Au domain