@article{Wang_Zhang_Li_Yang_Mi_Yu_2021, title={Electrospinning of Flexible Poly(vinyl alcohol)/MXene Nanofiber-Based Humidity Sensor Self-Powered by Monolayer Molybdenum Diselenide Piezoelectric Nanogenerator}, volume={13}, url={https://www.nmlett.org/index.php/nml/article/view/821}, DOI={10.1007/s40820-020-00580-5}, abstractNote={<p>Two-dimensional material has been widely investigated for potential applications in sensor and flexible electronics. In this work, a self-powered flexible humidity sensing device based on poly(vinyl alcohol)/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> (PVA/MXene) nanofibers film and monolayer molybdenum diselenide (MoSe<sub>2</sub>) piezoelectric nanogenerator (PENG) was reported for the first time. The monolayer MoSe<sub>2</sub>-based PENG was fabricated by atmospheric pressure chemical vapor deposition techniques, which can generate a peak output of 35&nbsp;mV and a power density of 42&nbsp;mW m<sup>−2</sup>. The flexible PENG integrated on polyethylene terephthalate (PET) substrate can harvest energy generated by different parts of human body and exhibit great application prospects in wearable devices. The electrospinned PVA/MXene nanofiber-based humidity sensor with flexible PET substrate under the driven of monolayer MoSe<sub>2</sub> PENG, shows high response of ∼40, fast response/recovery time of 0.9/6.3&nbsp;s, low hysteresis of 1.8% and excellent repeatability. The self-powered flexible humidity sensor yields the capability of detecting human skin moisture and ambient humidity. This work provides a pathway to explore the high-performance humidity sensor integrated with PENG for the self-powered flexible electronic devices.</p> <p>Highlights:</p> <p>1 A flexible piezoelectric nanogenerator (PENG) based on 2D single-layer MoSe<sub>2</sub> flake on polyethylene terephthalate was fabricated.<br>2 A high-performance flexible poly(vinyl alcohol)/MXene (PVA/MXene)-based humidity sensor was fabricated by electrospinning.<br>3 The PVA/MXene composite-based humidity sensor was self-powered by MoSe<sub>2</sub> PENG and exhibited excellent properties.</p>}, journal={Nano-Micro Letters}, author={Wang, Dongyue and Zhang, Dongzhi and Li, Peng and Yang, Zhimin and Mi, Qian and Yu, Liandong}, year={2021}, month={Jan.}, pages={57} }