Li Hui, Chu Shushu, Ma Qian, Li Hang, Che Quande, Wang Junpeng, Wang Gang, Yang Ping
School of Material Science and Engineering , University of Jinan , 250022 Jinan , P. R. China.
ACS Appl Mater Interfaces. 2019 Aug 28;11(34):31551-31561. doi: 10.1021/acsami.9b10410. Epub 2019 Aug 14.
One-step single-spinneret electrospinning synthesis of 1D fibrous hierarchical structure can not only prevent the agglomeration or restacking of fibers or particles and enlarge surface active area but also promote the directional migration of electrons in materials and achieve effective regulation of resistances. Herein, tunable SnO and SnO/ZnO fibrous hierarchical structures with in situ growth of monodisperse spherical-like particles on surface provide a new sight for adjusting component distribution, surface absorption and chemical reaction, electronic transmission path, and electron transfer efficiency. Compared with SnO porous fibers and SnO hierarchical structures, the optimal SnO/ZnO sensors exhibit superior gas-sensing response value of 366-100 ppm ethanol at 260 °C as well as excellent gas selectivity and long-term stability, in which the enhanced gas-sensing mechanism is primarily derived from multilevel effective heterojunctions with unique interface electronic effects. Especially, these SnO-based sensors can achieve favorable linear relationship of the response and gas concentration for sensitive trace detection in cosmetics for the first time, providing a new strategy to design composite materials for quantitative analysis of volatiles in the cosmetics evaluation process.
一步单喷头静电纺丝合成一维纤维分级结构，不仅可以防止纤维或颗粒的团聚或重新堆积，扩大表面活性面积，还可以促进材料中电子的定向迁移，实现对电阻的有效调控。在此，表面原位生长单分散球状颗粒的可调谐SnO和SnO/ZnO纤维分级结构为调整组分分布、表面吸附与化学反应、电子传输路径以及电子转移效率提供了新视角。与SnO多孔纤维和SnO分级结构相比，最优的SnO/ZnO传感器在260℃下对100 ppm乙醇展现出366的优异气敏响应值，以及出色的气体选择性和长期稳定性，其中增强的气敏机制主要源于具有独特界面电子效应的多级有效异质结。特别地，这些基于SnO的传感器首次在化妆品敏感痕量检测中实现了响应与气体浓度的良好线性关系，为在化妆品评估过程中设计用于挥发性物质定量分析的复合材料提供了新策略。
