Abstract
Electrohydrodynamic direct-write (EDW) is a novel direct-write technology to fabricate micro/nano-structures from viscoelastic solution, which had displayed great application potential in organic electronic device. Due to the shorter spinneret to substrate distance, the rheology behaviors of EDW charged jet played an important role in defining the line width or diameter of the direct-written micro/nano-structures. High speed camera is utilized to observe the rheology process of EDW charged jet, and solidified jets are measured by SEM that offers a quantitative method to investigate the diameter evolution of jet. The diameter of charged jet and nanofiber injected from solid probe increase with the increasing of polymer solution concentration. Attribute to the larger diameter and higher solvent content, charged jet injected from hollow nozzle displayed greater fluid viscoelasticity, and then stretched into micro structure of flat film under the gravitation on the substrate. The diameter of charged jet and line width of thin film injected from nozzle decrease with the increasing of polymer concentration.
Highlights
Due to the capacity of accomplish both pattern and material transfer processes simultaneously,[1,2] direct-write has become one of the most popular micro/nano fabrication technologies
When solid probe was used as spinneret, the diameter of polymer solution droplet attached at the tip of spinneret by the dip pen analogous manner was about 50∼60 μm
The rheology behaviors of charged jet in Electrohydrodynamic direct-write (EDW) were investigated in this work
Summary
Due to the capacity of accomplish both pattern and material transfer processes simultaneously,[1,2] direct-write has become one of the most popular micro/nano fabrication technologies. Direct-written micro/nano-structures possess great potential application in various fields including sensors,[3] electronics,[4] memory,[5] micro/nano system[6] and integrated power sources.[7] Several directwrite techniques have been developed such as ink jet printing,8 “Dip-Pen” Nanolithography,[9] and matrix assisted pulsed laser evaporation direct-write.[10] Direct-write doesn’t require stencil-plate and etching process, displays good material compatibility with micro organic structure fabrication.[11] As a fast, low-cost, direct and precise organic fabrication technology, direct-write meets the development requirement of flexible and organic electronic.[12]. The rheology and motion behaviors of stable charged jet are important to define the deposition position and configuration of direct-written structures. The plasticity and elasticity characteristics transference defines the diameter reducing rate of charged jet. The rheology behavior of charged jet plays more important role on the size of micro/nano-structures in EDW than that in traditional electrospinning. The relationships between rheology behaviors and line width/diameter of direct-written thin film/nanofiber were discussed
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