Year: 2025
Type: article
Abstract: Contact electrification (CE) refers to the charge generation of two materials after contact and separation, benefiting applications including electrophotography, electrostatic self‐assembly, and energy harvesting. However, surface asperities lead to a low effective charging area and restrict the net CE charge density. Here, atomically flat polytetrafluoroethylene (PTFE) and graphite microflake are used to increase the contact efficiency and achieve an unprecedented intrinsic CE charge density of 2.6 mC m−2. Crucially, the unipolar negative charging region is observed at the graphite/PTFE interface, which effectively eliminates charge cancellation and amplifies net charge density, diverging from the charge mosaic pattern. These findings provide a fundamental understanding for further material/interface development toward controllable triboelectric charge density.
Source: Small
Institutions: Chinese University of Hong Kong, Research Institute of Tsinghua University in Shenzhen, Tsinghua University, The Hong Kong University of Science and Technology (Guangzhou), Southern University of Science and Technology, Tsinghua Shenzhen International Graduate School, Hong Kong University of Science and Technology, Guangzhou HKUST Fok Ying Tung Research Institute
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $5,790
OpenAlex ID: W4413291296