Xu Cheng, Liu Haojie, Peng Zirun, Zhang Yan, Liu Na, Li Shiheng, Wang Zhong Lin, Feng Peizhong
School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China.
Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, China.
ACS Appl Mater Interfaces. 2025 Aug 13;17(32):45808-45815. doi: 10.1021/acsami.5c11899. Epub 2025 Jul 29.
The output performance of triboelectric nanogenerators (TENGs) largely depends on the density of electrons on the surface of the triboelectric materials, which is usually generated by the direct contact of two solid materials. Here, a novel method is proposed to regulate the surface charges of materials without physical contact. A laser-tunable noncontact triboelectric nanogenerator (LTNC-TENG) is fabricated, enabling the dynamic regulation of the surface states of materials through laser irradiation to optimize the performance of TENGs. In the experiment, TiO, SiO, and VO LTNC-TENGs are designed and prepared. The results show that under low-energy laser irradiation, the open-circuit voltage () and short-circuit transferred charge () increase, primarily due to the enhancement of the surface state energy levels induced by laser irradiation. As the laser energy increases beyond the laser-induced damage threshold (LIDT) of the films, induced damage occurs, generating abundant high-temperature plasma and resulting in decreased and . Building upon these findings, a single-electrode mode LTNC-TENG is developed where voltage jumps occur when laser energy exceeds the film's LIDT. Furthermore, an electron cloud-potential well model is proposed, describing the approach of atoms from two different materials under laser irradiation without direct contact. This model elucidates the detailed mechanism of laser-induced charge transfer and reveals the "precursor" process of contact electrification. This study contributes to a deeper understanding of the underlying mechanisms of contact electrification and provides a theoretical foundation for the development of more advanced and noncontact TENGs, with largely enhanced lifetime.
摩擦电纳米发电机（TENGs）的输出性能在很大程度上取决于摩擦电材料表面的电子密度，这通常是由两种固体材料的直接接触产生的。在此，提出了一种无需物理接触即可调节材料表面电荷的新方法。制造了一种激光可调非接触摩擦电纳米发电机（LTNC-TENG），通过激光照射实现对材料表面状态的动态调节，以优化TENGs的性能。在实验中，设计并制备了TiO、SiO和VO的LTNC-TENG。结果表明，在低能量激光照射下，开路电压（）和短路转移电荷（）增加，这主要是由于激光照射引起的表面态能级增强。当激光能量增加超过薄膜的激光诱导损伤阈值（LIDT）时，会发生诱导损伤，产生大量高温等离子体，导致和降低。基于这些发现，开发了一种单电极模式的LTNC-TENG，当激光能量超过薄膜的LIDT时会出现电压跳跃。此外，还提出了一个电子云-势阱模型，描述了两种不同材料的原子在激光照射下无需直接接触的靠近过程。该模型阐明了激光诱导电荷转移的详细机制，并揭示了接触起电的“前驱”过程。本研究有助于更深入地理解接触起电的潜在机制，并为开发寿命大大延长的更先进非接触TENGs提供理论基础。
