Liu, Chang-JingChang-JingLiuHsiao, Shu-WeiShu-WeiHsiaoChen, Qun-GaoQun-GaoChenHong, Qi-AnQi-AnHongLin, Yen-TingYen-TingLinCHU-CHEN CHUEHNg, Chan-TatChan-TatNgChang, Ting-TingTing-TingChangKim, Seong H.Seong H.KimChiu, Yu-ChengYu-ChengChiuLee, Wen-YaWen-YaLee2026-02-092026-02-092026-01-1419448244https://www.scopus.com/record/display.uri?eid=2-s2.0-105027553685&origin=resultslisthttps://scholars.lib.ntu.edu.tw/handle/123456789/735868A stretchable, high-k dielectric material based on thiol–ene-cross-linked nitrile-butadiene rubber (NBR) for synaptic transistors is demonstrated. We investigated NBR formulations cross-linked with three thiol cross-linkers. The thiol–ene-cross-linked NBR dielectrics achieve a high dielectric constant (k = 14.6), enabling low-voltage transistor operation (<5 V) and photopatterned capability. By comparing different thiol cross-linkers, we have found that more thiol groups facilitate higher charge mobility and larger hysteresis. The thiol–ene-cross-linked NBR dielectric-based transistor exhibited superior electrical properties, including a high mobility (0.42 cm2 V–1 s–1), a high ON/OFF ratio (104), and a small threshold voltage (0.2 ± 0.4 V). More importantly, these devices effectively mimic synaptic functions. A large hysteresis, driven by dielectric polarization and enhanced by thiol introduction, was observed, particularly pronounced in NBR dielectric with multiple thiol-cross-linkers. The thiol–ene-cross-linked NBR device displayed superior short-term plasticity and long-term potentiation/depression, indicating its learning and memory capabilities. Encouragingly, the fully stretchable NBR transistor maintained good electrical performance, stable hysteresis, and essential synaptic behaviors even at 60% strain. As a practical demonstration for neuromorphic applications, the thiol–ene-cross-linked NBR device exhibited excellent acoustic classification performance, achieving recognition accuracy close to 99% even under mechanical deformation. In summary, the developed thiol–ene cross-linked NBR offers highly promising electronic properties for stretchable, low-voltage neuromorphic devices.trueartificial synapsehigh-k dielectric materialsnonvolatile memorystretchable transistorthiol–ene chemistryjournal article10.1021/acsami.5c183422-s2.0-105027553685