Nano‐Oil‐Barrier‐Based Fluttering Triboelectric Nanogenerator. - Heo, Deokjae; Hur, Jiwoong; Cho, Hyeonho; Cha, Kyunghwan; Choi, Jaeung; Choi, Moonhyun; Hong, Jinkee; Kim, Sunghan; Lee, Sangmin (Advanced Science, 2025)