Electronic Supplementary Information

Fabrication of ZnO nanorod-assembled multishelled hollow

spheres and enhanced performance in gas sensor

Peng Hu, Ning Han, Xing Zhang, Mingshui Yao, Yuebin Cao, Ahui Zuo, Gang Yang and Fangli

Yuan*

State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese

Academy of Sciences, Beijing 100190 (PR China)

Fiugre S1 Schematic illustration of the sensor setup.

Figure S2 XRD pattern of synthesized products.

4

8

1-HCHO solution, 2- Sample valve, 3-Tube furnace, 4-Sensing film, 5-Pt wire6-Ag paste, 7-Keithley 2601 sourcemeter, 8-GPID card, 9-PC, 10-KMnO4+H2SO4

3

Effluent

10

2

1

Air

65

7 9

2

20 40 60 80

Inte

nsity

(a.u

.)

2Θ(deg.)

(202

)

(004

)(201

)(1

12)

(200

)(10

3)(110

)

(102

)

(101

)(0

02)(100

)

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2011

Figure S3 The products synthesized in mixed ternary solvents (EG, ethanol and water) without

adding PEO-PPO-PEO copolymer by varying the volume ratio of solvents: (a) 4 mL water, 6 mL

ethanol and 60 mL ethylene glycol, (b) 7.5 mL water, 2.5 mL ethanol and 60 mL ethylene

glycol, (c) 10 mL water, 10 mL ethanol and 50 mL ethylene glycol and (d) 18 mL water, 12

mL ethanol and 40 mL ethylene glycol.

Figure S4 TGA analysis of PEO-PPO-PEO copolymer bonded ZnO capsules. The weight loss

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2011

steps between 200 and 300 oC is attributed to the pyrolysis of the copolymer and the PEG block,

and the second weight loss higher than 340 o

C corresponds to the decomposition of the residue

polymer especially the PPG block.

Figure S5 Size distribution histograms of the particles obtained with different react time (a) 50 min, (b) 6 h and (c) 12 h.

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2011

Electronic Supplementary InformationFabrication of ZnO nanorod-assembled multishelled hollow spheres and enhanced performance in gas sensor

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