Kim, Jae Won Cho, Hyun Jun Kim, Seung Min Kim, Young-Kwan 2025-08-26T02:00:14Z 2025-08-26T02:00:14Z 2025-08-20 2025-12 0169-4332 https://pubs.kist.re.kr/handle/201004/153026 This study presents an integrated strategy combining wet-chemical and dry-mechanical processes to enhance the properties and applicability of commercial directly spun carbon nanotube fiber (CNTF) with a high linear density of similar to 6 tex (g km(-1)). The sequential wet-chemical process is demonstrated for the first time based on the cross-linking of polyethyleneimine (PEI) with pyrogallol (PG). The PEI and PG (PEI@PG) treatment of CNTFs improves their properties, followed by twisting to enhance their density and alignment. These rapid sequential processes can be completed within 1 min, and the twisted PEI@PG CNTFs exhibit enhanced tensile strength, modulus, and electrical conductivity from 27.27 MPa, 0.50 GPa, and 2,685 S cm(-1) to 202.44 MPa, 5.89 GPa, and 4,370 S cm(-1). The twisted PEI@PG CNTF shows an improved gravimetric capacitance from 4.92 to 10.33 Fg-(1). The twisted Au nanoparticle-loaded PEI@PG CNTFs are harnessed as a fibrous catalyst for hydrogenation of 4-nitrophenol with a high activity of 0.054 min(-1) and electrochemical glucose sensors with high sensitivity of 304.06 mA mM(-1) cm(-2), detection limit of 0.166 mu M, and a wide linear range from 0.548 mu M to 8.0 mM, respectively. This strategy offers a simple, rapid, and scalable route to enhance the performance and applicability of CNTFs. English Elsevier BV Integrated reinforcement of carbon nanotube fibers for enhancement of their applicability, mechanical and electrical properties Article 10.1016/j.apsusc.2025.164066 1 Applied Surface Science, v.712 Applied Surface Science 712 N scie scopus 001544935500001 2-s2.0-105012041953 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article HIGH-PERFORMANCE ELECTRODE Carbon nanotube Nanocomposite Fiber Supercapacitor Sensor Catalyst