摘要
Most van der Waals two-dimensional(2D)materials without surface dangling bonds show limited surface activities except for their edge sites.Ultrathin Bi_(2)Se_(3),a topological insulator that behaves metal-like under ambient conditions,has been overlooked on its surface activities.Herein,through a topochemical conversion process,ultrathin nanoporous Bi_(2)Se_(3) layers were epitaxially deposited on BiOCl nanosheets with strong electronic coupling,leading to hybrid electronic states with further bandgap narrowing.Such oriented nanoporous Bi_(2)Se_(3) layers possessed largely exposed active edge sites,along with improved surface roughness and film forming ability even on inkjet-printed flexible electrodes.Superior room-temperature NO_(2) sensing performance was achieved compared to other 2D materials under bent conditions.Our work demonstrates that creating nanoscale features in 2D materials through topochemical heteroepitaxy is promising to achieve both favorable electronic properties and surface activity toward practical applications.
出处
《Research》
EI
CAS
CSCD
2022年第4期211-221,共11页
研究（英文）
基金
This work was supported by the National Key Basic Research Program of China(grant no.:2021YFB3200302)
the National Natural Science Foundation of China(grant nos.:51832001 and 52102114)
the Fundamental Research Funds for the Central Universities of China,the Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University(grant nos.:2020GXLH-Z-026 and 2020GXLH-Z-027)
the China Postdoctoral Science Foundation(grant nos.:2021M692618 and 2021M702657)
the Natural Science Foundation of Shaanxi Province(2021JQ-112).
