Integrated Random-Aligned Carbon Nanotube Layers: Deformation ...

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Integrated Random-Aligned Carbon Nanotube Layers: Deformation. Mechanism under Compression. Zhiping Zeng1, Xuchun Gui1,* , Qiming Gan1, Zhiqiang ...
Electronic Supplementary Material (ESI) for Nanoscale This journal is © The Royal Society of Chemistry 2013

Integrated

Random-Aligned

Carbon

Nanotube

Layers:

Deformation

Mechanism under Compression Zhiping Zeng1, Xuchun Gui1,* , Qiming Gan1, Zhiqiang Lin1, Yuan Zhu1, Wenhui Zhang1, Rong Xiang1, Anyuan Cao2 and Zikang Tang1,3 1

State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and

Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China 2

Department of Materials Science and Engineering, College of Engineering, Peking University,

Beijing 100871, P. R. China 3

Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay,

Kowloon, Hong Kong, China

Supporting Information εc=0%

εc=23%

εc=32%

εc=37%

εc=45%

εc=48%

εc=52%

εc=56%

500 μm

εc=54%

εc=48%

εc=43%

εc=40%

εc=35%

εc=25%

εc=22%

εc=0%

Fig. S1 Low magnification SEM observed the deformation process of the double layered structure with the compressive strain gradually increased to 56% and then decreased to 0 %. ε c is the strain of the composite.

Electronic Supplementary Material (ESI) for Nanoscale This journal is © The Royal Society of Chemistry 2013

50 μm

5 μm

50 μm

5 μm

εc=32%, εs=77%, εa=0%

500 μm

50 μm

5 μm

Fig. S2 SEM images of sponge-array double layered structure under the compressive strain of 32 %.

Electronic Supplementary Material (ESI) for Nanoscale This journal is © The Royal Society of Chemistry 2013

εc=52%, εs>99%, εa=18%

50 μm

5 μm

500 μm

50 μm

5 μm

Fig. S3 SEM images of sponge-array double layered structure under the compressive strain of 52 %.

Electronic Supplementary Material (ESI) for Nanoscale This journal is © The Royal Society of Chemistry 2013

(b) 2.5

2.5 cycle 1 2 10 20 30 40 50

2.0 1.5 1.0

Compressive stress (MPa)

Compressive stress (MPa)

(a)

0.5 0.0 0.0

0.1

0.2

0.3

Compressive strain

2.0 1.5 1.0

cycle 1 2 10 20 30 40 50

0.5 0.0 0.0

0.2

0.4

0.6

0.8

1.0

Compressive strain

Fig. S4 (a) Compressive stress-strain curves of a CNT array for 50 cycles. (b) Compressive stress-strain curves of a CNT sponge for 50 cycles.

Electronic Supplementary Material (ESI) for Nanoscale This journal is © The Royal Society of Chemistry 2013

Table S1. Energy absorption, energy dissipation, and energy loss coefficient (ΔE/E) values of the composite, sponge and array Energy

Energy

absorption

dissipation

(KJ/m3)

(KJ/m3)

1st

160.0

108.2

0.68

50th

56.7

28.7

0.51

1st

405.5

228.2

0.56

50th

140.1

48.5

0.35

Double-layered

1st

282.8

181.8

0.64

composite

50th

92.2

38.5

0.42

Samples

Sponge

Array

Cycle

ΔE/E