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Screen-Printing of Functionalized MWCNT-PEDOT:PSS Based Solutions on Bendable Substrate for Ammonia Gas Sensing
| Content Provider | MDPI |
|---|---|
| Author | Boonthum, Direk Oopathump, Chutima Fuengfung, Supasil Phunudom, Patipak Thaibunnak, Ananya Juntong, Nachapan Rungruang, Suvanna Pakdee, Udomdej |
| Copyright Year | 2022 |
| Description | Multi-walled carbon nanotubes (MWCNTs) were grown on a stainless-steel foil by thermal chemical vapor deposition (CVD) process. The MWCNTs were functionalized with carboxylic groups (COOH) on their surfaces by using oxidation and acid (3:1 $H_{2}SO_{4}/HNO_{3}$) treatments for improving the solubility property of them in the solvent. The functionalized MWCNTs (f-MWCNTs) were conducted to prepare the solution by continuous stir in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), dimethyl sulfoxide (DMSO), ethylene glycol (EG) and Triton X-100. The solution was deposited onto a bendable substrate such as polyethylene terephthalate (PET) with a fabricated silver interdigitated electrode for application in a room-temperature gas sensor. A homemade-doctor blade coater, an UNO R3 Arduino board and a L298N motor driver are presented as a suitable system for screen printing the solution onto the gas-sensing substrates. The different contents of f-MWCNTs embedded in PEDOT:PSS were compared in the gas response to ammonia $(NH_{3}$), ethanol $(C_{2}H_{5}$OH), benzene $(C_{6}H_{6}$), and acetone $(C_{3}H_{6}$O) vapors. The results demonstrate that the 3.0% v/v of f-MWCNT solution dissolved in 87.8% v/v of PEDOT:PSS, 5.4% v/v of DMSO, 3.6% v/v of EG and 0.2% v/v of Triton X-100 shows the highest response to 80 ppm $NH_{3}$. Finally, the reduction in the $NH_{3}$ response under heavy substrate-bending is also discussed. |
| Starting Page | 462 |
| e-ISSN | 2072666X |
| DOI | 10.3390/mi13030462 |
| Journal | Micromachines |
| Issue Number | 3 |
| Volume Number | 13 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-03-18 |
| Access Restriction | Open |
| Subject Keyword | Micromachines Screen-printing Multi-walled Carbon Nanotubes Pedot:pss Gas Sensor |
| Content Type | Text |
| Resource Type | Article |
