研究目的
To develop a straightforward, scalable and cost-efficient method for the fabrication of sophisticated and highly customizable nanolattice patterns by a dedicated series of microcontact printing and surface coating steps.
研究成果
The developed method offers a straightforward, scalable, and cost-efficient approach to fabricate sophisticated and highly customizable nanolattice patterns. It avoids the need for expensive lithographic techniques and can be applied to various types of functional nanoparticles, making it suitable for large-scale fabrication of optical and sensing devices.
研究不足
The preparation of regular oPDMS patterns at wavelengths <0.7 μm was not achievable due to smearing effects. The method's applicability may be limited by the need for precise control over stamp dimensions and orientation.
1:Experimental Design and Method Selection
The methodology involves the use of wrinkled PDMS stamps for microcontact printing to create hydrophobic stripe patterns on a substrate, followed by backfilling with a hydroxyl-functional polymer to guide the deposition of gold nanoparticles via electrostatic interaction.
2:Sample Selection and Data Sources
Silicon wafers were used as substrates. The samples were characterized using atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS).
3:List of Experimental Equipment and Materials
PDMS (Sylgard 184 elastomer kit), silicon wafers, poly(2-vinyl pyridine-co-2-hydroxyethyl acrylate) (P2VP-OH), gold(III) chloride trihydrate, sodium citrate hydrate, branched polyethylenimine, spin coater (Laurell Technologies Corporation, Spin Coater WS-650MZ-23NPPB), plasma oven (Plasma Technology, PlasmaFlecto 10), AFM (Bruker Dimension Icon), SEM (GeminiSEM 300, Zeiss).
4:Experimental Procedures and Operational Workflow
1. Preparation of wrinkled PDMS stamps. 2. Microcontact printing to transfer oligomeric PDMS to the substrate. 3. Backfilling with P2VP-OH. 4. Deposition of citrate-stabilized gold nanoparticles. 5. Customization of nanoparticle patterns via a second microcontact printing step.
5:Data Analysis Methods
AFM and SEM for morphological characterization, XPS for chemical analysis.
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