Research Papers

Preparation of Water-Based Carbon Nanotube Inks and Application in the Inkjet Printing of Carbon Nanotube Gas Sensors

[+] Author and Article Information
Ziyin Lin, Kyoung-sik Moon

School of Materials Science and Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332-0245

Taoran Le, Manos M. Tentzeris

School of Electrical and Computer Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332-0245

Xiaojuan Song

Georgia Tech Research Institute,
Georgia Institute of Technology,
Atlanta, GA 30332-0245

Ching-ping Wong

School of Materials Science & Engineering,
Georgia Institute of Technology;
Department of Electronic Engineering,
The Chinese University of Hong Kong,
Hong Kong, China
e-mail: cp.wong@mse.gatech.edu

Manuscript received December 19, 2011; final manuscript received August 5, 2012; published online March 26, 2013. Assoc. Editor: Jianmin Qu.

J. Electron. Packag 135(1), 011001 (Mar 26, 2013) (5 pages) Paper No: EP-11-1098; doi: 10.1115/1.4023758 History: Received December 19, 2011; Revised August 05, 2012

Water-based carbon nanotube (CNT) is highly desirable for inkjet printing devices due to its environmentally benign and low-cost features. To improve the dispersion of CNT in water, oxygen-containing functional groups are introduced into the surface of CNT via an acid oxidation process. The CNT-based gas sensor is fabricated by inkjet printing, which shows a high sensitivity toward NO2. The application of inkjet-printed CNT in a printed RF antenna for wireless sensing is also discussed.

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Grahic Jump Location
Fig. 1

CNT ink (∼5 mg/mL water)

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Fig. 2

FTIR spectra of functionalized CNTs

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Fig. 3

Raman spectra of CNTs before and after oxidation

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Fig. 4

Optical Image of printed CNT sensors: the black rectangle and bright long patterns are printed CNTs and silver ink, respectively

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Fig. 5

SEM images of printed CNT: (a) bird view of CNT surface at an angle of 30 deg; (b) morphology of CNT at high magnification; (c) bird view of CNT-paper interface at an angle of 30 °C; (d) CNT-Ag boundary

Grahic Jump Location
Fig. 6

The conductance change of inkjet-printed 75-layer CNT at 2.4 GHz as a function of time. 10 ppm NO2 was introduced between 5 and 35 mins.




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