研究目的
Demonstrating inkjet printed multilayer metal-dielectric-metal capacitors on flexible polyimide substrate for monolithic electronic circuit fabrication.
研究成果
The study successfully demonstrated the inkjet printing of flexible metal-dielectric-metal capacitors with controllable capacitance values. A functional LC circuit was also fabricated, showcasing the potential for monolithic printing of flexible electronic circuits for wearable sensors.
研究不足
Capacitors with 2 coats of PVP were electrically shorted, indicating insufficient dielectric thickness. The roughness of the substrate and ink surfaces may affect performance. Further investigation is needed to optimize the dielectric layer uniformity and thickness.
1：Experimental Design and Method Selection:
The study utilized inkjet printing (IJP) for fabricating metal-dielectric-metal capacitors on flexible polyimide (PI) substrates. A custom dielectric ink based on Poly 4-vinylphenol (PVP) was formulated, and silver nanoparticle ink was used for conductive plates.
2：Sample Selection and Data Sources:
Flexible PI tape was used as the substrate. Capacitors of various dimensions were printed to study the effect of design parameters on capacitance.
3：List of Experimental Equipment and Materials:
Dimatix Material Deposition Printer (DMP-2831, Fujifilm, Dimatix Inc., NH), Silver ink (Metalon JS-B40HV, Novacentrix, USA), PVP powder (Sigma Aldrich 436216), Poly (melamineco-formaldehyde) (Sigma Aldrich 418560), hexanol (Sigma Aldrich 471402).
4：2). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The process involved printing silver plates and PVP dielectric layers, followed by thermal sintering. Capacitance was measured using a Keysight-34461A digital multimeter and an Agilent 4294A for frequency sweeps.
5：Data Analysis Methods:
Capacitance values were analyzed in relation to plate dimensions and dielectric coatings. An equivalent circuit model was used to determine intrinsic parameters.
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Keysight-34461A digital multimeter
34461A
Keysight
Used for measuring capacitance.
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Agilent 4294A
4294A
Agilent
Used for conducting low frequency sweeps to calculate circuit parameters.
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Dimatix Material Deposition Printer
DMP-2831
Fujifilm, Dimatix Inc.
Used for printing capacitors of several dimensions on flexible PI tape.
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Silver ink
Metalon JS-B40HV
Novacentrix
Used for printing the conductive parallel metal plates.
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PVP powder
436216
Sigma Aldrich
Used to print the dielectric layer.
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Poly (melamineco-formaldehyde)
418560
Sigma Aldrich
Used in the formulation of PVP ink.
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Hexanol
471402
Sigma Aldrich
Used as a solvent in the formulation of PVP ink.
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Spectrum analyzer
DSA 1030
Rigol
Used to determine the resultant resonant frequency of the LC tank circuit.
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