2026-10-11T04:59:39Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33989552 2026-09-24T18:20:25Z category_146 category_915 category_7 category_13 category_14 category_16 category_24 portal_63 item_type_2 month_year_09_2026

Synergistic Trimodal Stimuli-Induced Impedance Matching in Polydopamine-Functionalized Magnetoelectric Nanogenerators: Toward Efficient Charge Generation and Hybrid Energy Harvesting Parvathy Ravindranath (23448667) Dalip Saini (13861551) Dipankar Mandal (1418383) Space Science Physical Sciences not elsewhere classified Medicine Genetics Molecular Biology Physiology Evolutionary Biology thereby validating architecture single compatible platform remarkable yang ’ quantitative analysis reveals molecular ferroelectric dipoles hybrid energy harvesting flexible autonomous systems enhanced charge generation coated cobalt ferrite 63 %, accompanied robust output power output power density magnetoelectric pathway arises functionalized magnetoelectric nanogenerators level impedance modulation synergistic trimodal stimuli >< sub >< induced impedance matching mechanical stimuli alone 2 </ sub power optimization variable stimuli trimodal piezo matching landscape magnetoelectric responses magnetoelectric nanogenerator magnetic stimuli k </ c </ vinylidene fluoride pyroelectric functionality net decrease internal resistance generalized thevenin findings reveal equivalent circuit electrospun poly electroactive β conversion channels combined excitation collectively reshape 9 mω 700 kω A trimodal piezo-pyro-magnetoelectric nanogenerator (PPyMENG) is introduced, comprising an electrospun poly(vinylidene fluoride) (PVF₂) nanofiber mat uniformly embedded with polydopamine-coated cobalt ferrite (PCFO) nanoparticles to integrate piezo-, pyro-, and magnetoelectric responses in a single compatible platform. In the PVPCF composite nanofiber mat, the electroactive β-crystalline phase provides coupled piezo- and pyroelectric functionality. The magnetoelectric pathway arises from the coupling between the molecular ferroelectric dipoles of PVF₂ and the uniformly distributed magnetostrictive PCFO nanoparticles, establishing three parallel energy-conversion channels that collectively reshape the impedance-matching landscape. For instance, simultaneous mode activation reduces the internal resistance from 1.9 MΩ (under mechanical stimuli alone) to 700 kΩ under the combined excitation of mechanical, thermal, and magnetic stimuli, corresponding to a net decrease of 63%, accompanied by a 176% enhancement in output power density. Quantitative analysis reveals a remarkable Yang’s coupling factor of <i>k</i>_<i>C</i>,Q = 5.6, substantially exceeding simple additive expectations and confirming strong cooperative interactions among the three energy transduction mechanisms. A generalized Thevenin-equivalent circuit with three resistive–capacitive branches captures the load–power profile across operating conditions, thereby validating architecture-level impedance modulation as a route to robust output power under variable stimuli. These findings reveal that multistimuli coupling can be leveraged to program internal resistance via parallel pathway activation and synergy-enhanced charge generation, providing a framework for power optimization in flexible autonomous systems. 2026-09-24T00:00:00Z Dataset Media 10.1021/acs.langmuir.6c01440.s004 https://figshare.com/articles/media/Synergistic_Trimodal_Stimuli-Induced_Impedance_Matching_in_Polydopamine-Functionalized_Magnetoelectric_Nanogenerators_Toward_Efficient_Charge_Generation_and_Hybrid_Energy_Harvesting/33989552 CC BY-NC 4.0