Nano-membrane, electronic device including the same, and method for manufacturing the nano-membrane

A method for manufacturing a nano-membrane, the method comprising:

• electrospinning a polyamic acid solution to prepare a precursor;
• adjusting the density and thickness of the precursor;
• converting to determine the shape of the precursor;
• imidizing the converted precursor to obtain a nano-membrane precursor;
• and
• treating the nano-membrane precursor with an oil-repellent finishing agent to introduce functional groups to the surface, wherein:
• the oil-repellent finishing agent is a solution containing 1 to 20 wt % of at least one selected from the group consisting of a fluorine-based compound, a silicone-based compound, and a hydrocarbon-based compound, and
• the imidization is performed at 200° C. to 500° C. for 10 to 30 minutes, wherein in the electrospinning step:
• air is blown in the direction in which the precursor is discharged, and
• the nano-membrane has a dust collection efficiency of 95% or more according to the following measurement method.
• [Measurement Method]
• Dust size:
• 0.6 μm;
• Air flow rate:
• 32 l/min;
• Measured according to AFT 8130 with a measurement area of 100 cm2,
• the carbon black particles have an aspect ratio of 1.0 to 5,
• has a water pressure resistance of 5,000 mmH2O to 15,000 mmH2O, and
• an air permeability of 1 cm3/cm2/sec (ccs) to 10 cm3/cm2/sec, a method for manufacturing a nano-membrane.