Lee, Kyu Seung Park, Young Jae Shim, Jaeho Chung, Hee-Suk Yim, Sang-Youp Hwang, Jun Yeon Cho, Hyunjin Lim, Byungkwon Son, Dong Ick 2024-01-19T18:04:16Z 2024-01-19T18:04:16Z 2021-09-05 2020-02 1566-1199 https://pubs.kist.re.kr/handle/201004/119001 We demonstrate the ZnO@graphene core@shell quantum dot (ZGQDs) fabricated by selectively engineering of oxygenated functional groups on the graphene shells with eco-friendly keratin textile for transparent and flexible UV photodetector devices. The ZGQDs with the octylamine (ZGQDs-OA) and the graphene sheet were employed as an active material and an electron transport channel. The functional groups on the surrounding graphene shell in ZGQDs were passivated by the OA, resulting in a good absorbance in UV light and excellent carrier transport properties. The passivation of the functional groups on the graphene shell by OA drastically enhanced the photocurrent. Optical transmittance of the ZGQDs-OA/graphene sheets/PMMA/keratin nanofiber textile composites structures was approximately 77% at the visible spectrum range. Current-voltage (I-V) and current-time (I-t) measurements on the UV photodetector under illumination state in bending condition exhibited the excellent ON/OFF switching states and stability. The photosensitivity and responsivity of the photodetector with ZGQDs-OA were found to be around 13.10 and 68.64 mu AmW-1, respectively, which is much higher than that without the passivation. The improved performance of the photodetector with ZGQDs-OA could be attributed to the efficient electron transport to the electrode by the passivation of the graphene on ZnO QDs. English ELSEVIER QUANTUM DOTS INTEGRATION FILMS CELLS ZnO@graphene QDs with tuned surface functionalities formed on eco-friendly keratin nanofiber textile for transparent and flexible ultraviolet photodetectors Article 10.1016/j.orgel.2019.105489 1 ORGANIC ELECTRONICS, v.77 ORGANIC ELECTRONICS 77 scie scopus 000517965600059 2-s2.0-85076562955 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article QUANTUM DOTS INTEGRATION FILMS CELLS Textile Eco-friendly ZnO@graphene QDs Flexible device Photodetector