| Title: | Design and Fabrication of Ultrathin Nanoporous Donor-Acceptor Copolymer-Based Organic Field-Effect Transistors for Enhanced VOC Sensing Performance |
| Author(s): | Tran VV; Jeong G; Wi E; Lee D; Chang M; |
| Address: | "Laser and Thermal Engineering Laboratory, Department of Mechanical Engineering, Gachon University, Seongnam 13120, South Korea. Department of Polymer Engineering, Chonnam National University, Gwangju 61186, South Korea. School of Polymer Science and Engineering, Chonnam National University, Gwangju 61186, South Korea. Alan G. MacDiarmid Energy Research Institute, Chonnam National University, Gwangju 61186, South Korea" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "The development of organic field-effect transistor (OFET) chemical sensors with high sensing performance and good air stability has remained a persistent challenge, thereby hindering their practical application. Herein, an OFET sensor based on a donor-acceptor copolymer is shown to provide high responsivity, sensitivity, and selectivity toward polar volatile organic compounds, as well as good air stability. In detail, a polymer blend of N-alkyl-diketopyrrolo-pyrrole-dithienylthieno[3,2-b]thiophene (DPP-DTT) and polystyrene is coated onto an FET substrate via shearing-assisted phase separation (SAPS) combined with selective solvent etching to fabricate the DPP-DTT-based OFET device having an ultrathin nanoporous structure suitable for gas sensing applications. This is achieved via optimization of the film morphology by varying the shear rate to adjust the dynamic balance between the shear and capillary forces to obtain an ultrathin thickness ( approximately 8 nm) and nanopore size (80 nm) that are favorable for the efficient diffusion and interaction of analytes with the active layer. In particular, the sensor presents high responsivities toward methanol ( approximately 70%), acetone ( approximately 51.3%), ethanol ( approximately 39%), and isopropyl alcohol (IPA) ( approximately 29.8%), along with fast response and recovery times of approximately 80 and 234 s, respectively. Moreover, the average sensitivity was determined to be 5.75%/ppm from the linear plot of the responsivity against the methanol concentration in the range of 1-100 ppm. Importantly, the device also exhibits excellent long-term (30-day) air and thermal storage stability, thereby demonstrating its high potential for practical applications" |
| Keywords: | VOC sensing conjugated polymers donor-acceptor copolymer organic field-effect transistors shear coating; |
| Notes: | "PubMed-not-MEDLINETran, Vinh Van Jeong, Ganghoon Wi, Eunsol Lee, Daeho Chang, Mincheol eng 2023/04/24 ACS Appl Mater Interfaces. 2023 May 3; 15(17):21270-21283. doi: 10.1021/acsami.3c00105. Epub 2023 Apr 24" |
