研究目的
To demonstrate that the surface potential of PMMA fibers produced by electrospinning can be tailored through the polarity of the voltage used during fabrication, thereby improving triboelectric performance compared to spin-coated PMMA films, for potential use in energy harvesting applications.
研究成果
Electrospinning with controlled voltage polarity effectively tailors the surface chemistry and potential of PMMA fibers, enhancing their triboelectric performance. PMMA- fibers showed higher power output than PMMA+ fibers and spin-coated films, indicating a shift in triboelectric series position. This approach can be applied to other materials for improved energy harvesting, particularly in biocompatible applications.
研究不足
The study is limited to PMMA and specific electrospinning conditions; results may not generalize to other materials or fabrication parameters. The triboelectric performance testing uses low force and frequency to simulate human body conditions, which might not cover all operational scenarios. Long-term stability and scalability for in vivo applications are not fully addressed.
1：Experimental Design and Method Selection:
The study uses electrospinning with positive and negative voltage polarities to fabricate PMMA fibers, comparing them to spin-coated PMMA films. XPS and KPFM are employed to analyze surface chemistry and potential, and triboelectric generators are built and tested for electrical output.
2：Sample Selection and Data Sources:
PMMA fibers are produced from a 12 wt% PMMA solution in DMF, with fibers deposited on Au-coated Si wafers for analysis and on aluminium foil for generator testing. Spin-coated PMMA films serve as a control.
3：List of Experimental Equipment and Materials:
Equipment includes electrospinning apparatus (EC-DIG with climate chamber, IME Technologies), SEM (Merlin Gemini II, ZEISS), XPS (PHI VersaProbeII, ULVAC-PHI), AFM/KPFM (Multi mode 8, Bruker), spin coater (L2001A v.3, Ossila), hot plate (IKA RCT basic), multimeter (Keithley 2002), picoammeter (Keithley 6487). Materials include PMMA (Mw = 350,000 g mol?1, Sigma Aldrich), DMF (Sigma Aldrich), aluminium foil, copper substrate, Au-coated Si wafers.
4：7). Materials include PMMA (Mw = 350,000 g mol?1, Sigma Aldrich), DMF (Sigma Aldrich), aluminium foil, copper substrate, Au-coated Si wafers.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: PMMA solution is prepared and electrospun with ±12 kV at 15 cm distance, 4 ml h?1 flow rate. Spin-coating is done at 2500 rpm. SEM imaging and fiber diameter analysis with ImageJ. XPS analysis at 10° take-off angle. KPFM measurements with CoCr-coated AFM tip. Triboelectric generators are fabricated by depositing fibers on aluminium and impacting with copper electrode at ~0.7 N force and 2 Hz frequency; electrical outputs are measured after stabilization.
5：7 N force and 2 Hz frequency; electrical outputs are measured after stabilization.
Data Analysis Methods:
5. Data Analysis Methods: XPS data deconvoluted using PHI Multipak software. KPFM data analyzed for surface potential. Electrical output (Voc, Isc, RMS voltage/current, power) calculated and compared across samples.
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