研究目的
To develop a simple gold leaf processing technology based on the hybridization of AuNPs and CNFs, aiming to reduce gold usage while achieving superior mechanical, chemical, and electrical properties for applications in coatings, smart papers, electronic skins, and wearable devices.
研究成果
The AuNP/CNF hybrid film exhibits metallic electrical conductivity, high mechanical strength, flexibility, self-healing ability, and chemical resistance with reduced gold usage. It enables uniform coating on micrometer-sized substrates, outperforming conventional methods in durability and environmental friendliness, with potential applications in various fields.
研究不足
The maximum AuNP content in the hybrid film is limited to 15 vol.%, and the process may require optimization for scalability and integration with other nanomaterials. The technique's applicability to non-aqueous systems or other substrates may need further investigation.
1：Experimental Design and Method Selection:
The study utilized a bottom-up approach involving spontaneous binding between AuNPs and CNFs in aqueous media, leveraging electrostatic repulsion and hydrogen bonding. Methods included mixing, stirring, filtration, drying, thermogravimetric analysis (TGA), electrical resistivity measurement via DC four-probe method, scanning electron microscopy (SEM), transmission electron microscopy (TEM), tensile strength testing, and AuNP growth procedures.
2：Sample Selection and Data Sources:
Samples consisted of citrate-coated AuNPs with a mean diameter of 31 nm and CNFs with widths of 10 nm and lengths around 1 μm, both dispersed in aqueous media. Microbeads were used as substrates for coating experiments.
3：List of Experimental Equipment and Materials:
Equipment included TGA apparatus, SEM, TEM, DC four-probe setup for electrical measurements, tensile testing machine, and ultrasonicator. Materials included AuNPs, CNFs, ethylenediamine binder, and various solvents.
4：Experimental Procedures and Operational Workflow:
AuNPs and CNFs were mixed and stirred for up to 72 hours, followed by filtration to obtain hybrid films. Films were dried at 403 K, and properties were characterized. For microbead coating, ethylenediamine was used as a binder to facilitate AuNP and CNF attachment, followed by AuNP growth to enhance conductivity.
5：Data Analysis Methods:
Data were analyzed using percolation theory for electrical resistivity, statistical methods for tensile strength (n=5), and visual/spectroscopic techniques for morphological and optical properties.
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