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ชื่องานวิจัย ( Article Name)

Growth of MWCNTs on Plasma Ion-Bombarded Thin Gold Films and Their Enhancements of Ammonia-Sensing Properties Using Inkjet Printing

บทคัดย่อ ( Abstract )

Multiwalled carbon nanotubes (MWCNTs) have been synthesized on thin gold (Au) films using thermal chemical vapor deposition (CVD). The films were evolved to catalytic Au nanoparticles (Au NPs) by plasma argon (Ar) ion bombardment with a direct current (DC) power of 216 W. (e characteristics of the MWCNTs grown on Au catalysts are strongly dependent on the growth temperature in thermal CVD process. (e MWCNTs were then purified by oxidation (550°C) and acid treatments (3 :1 H2SO4/HNO3). After purifying the MWCNTs, they were dispersed in deionized water (DI water) under continuous sonication. (e MWCNTsolution was then ultrasonically dissolved in a conducting polymer mixture of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) to prepare for an electronic ink. (e ink was deposited onto the flexible and transparent plastic substrates such as polyethylene terephthalate (PET) with fabricated silver interdigitated electrode using two methods such as drop-casting and inkjet printing to compare in the detection of ammonia (NH3) and other volatile organic compounds (VOCs) at room temperature. Based on the results, the gas response, sensitivity, and selectivity properties of MWCNT-PEDOT:PSS gas sensor forNH3 detection are significantly enhanced by using inkjet printing technique.(e sensing mechanism of fabricated gas sensor exposed toNH3 has been also proposed based on the swelling behaviour of polymer due to the diffusion of NH3 molecules into the polymer matrix. For the MWCNTs, they were mentioned as the conductive pathways for the enhancement of gas-sensing signals.

เอกสารวิจัย ( Paper )

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ผู้เขียน ( Authors )

  • อุดมเดช ภักดี

ข้อมูลการเผยแพร่ ( Journal Infomation )