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Electronic Supplementary Material

Citrate-assisted one-pot assembly of palladium nanoparticles onto ZnO nanorods for CO sensing application
Prabhakar Rai, Yeon-Tae Yu*

Division of Advanced Materials Engineering and Research Centre for Advanced Materials Development, College of Engineering, Chonbuk National University, Jeonju 561-756, South Korea
*Corresponding author: Y-T Yu (E-Mail: yeontae@jbnu.ac.kr, Tel: +82-63-270-2288, Fax: +82-63-270-2305).
Fig. S1 Sketch diagram of preparation of ZnO thick film sensor device.

Gas sensor fabrication

ZnO powder (0.1g) was mixed with α-terpineol (500 μl) and grinded in an agate mortar for 30 min. The ZnO paste was pasted by doctor blading method onto the cleaned alumina circuit board with interdigitated platinum electrodes. The size of alumina circuit board was 15 mm × 15 mm. In this circuit board platinum electrode were interdigitated in the area of 10 mm × 10 mm. The spacing between two electrodes was 237 μm, measured by SEM. The device was dried at 80oC for 5 h. The ZnO loaded device was calcined at 500°C in an electric furnace for 5 h. The change in resistance of the device due to the presence of test gas was measured using a high resistance meter (Agilent 34970A). Resistance meter was connected to the computer via a KUSB-488A interface to record the signal due to change in resistance. The device was tested in the temperature range of 200 to 400°C at various concentrations of CO (200-1000 ppm) in a temperature-controlled environment. The balance gas was N2, and the air was mixed to be 10.5 % of oxygen. The total gas flow rate was 100 cm3 / min. Before injection of test gas, the device was stabilized in air for 2 h, to stabilize the base line. The sensor response (Rs) was calculated using (Ra/Rg). Here Ra is the resistance in air with 10.5 % O2, and Rg is the resistance of the test and mixed gas.


Fig.S2 EDS analysis of Pd/ZnO NRs.


Elmt. Spect. Element Atomic

Type % %

O K ED 32.52 66.46

Zn K ED 66.43 33.22

Pd L ED 1.05 0.32

Total 100.00 100.00

* = <2 Sigma




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