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A method for preparing large-area single-layer colloidal crystal templates by ultrasonic spraying

A single-layer colloidal crystal, ultrasonic spray technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of PS microspheres sinking into water, destroying the dynamic balance of liquid level, etc., to avoid unstable factors , the effect of enhancing robustness and reducing likelihood

Active Publication Date: 2022-06-07
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and practical, and can be produced on a large scale. However, the contact control between the injection needle and the liquid surface must be very strict in the experiment. Whether it is submerged or exposed to the liquid surface, it may cause the PS microspheres to sink directly into the water, or even destroy the dynamics of the liquid surface. balance

Method used

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  • A method for preparing large-area single-layer colloidal crystal templates by ultrasonic spraying
  • A method for preparing large-area single-layer colloidal crystal templates by ultrasonic spraying
  • A method for preparing large-area single-layer colloidal crystal templates by ultrasonic spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1: Dilute the PS nano-microsphere stock solution (particle size 250 nm, concentration 2.5 wt%) with absolute ethanol in a volume ratio of 1:1, and then ultrasonically disperse for 5 min. Use a 10mL syringe to draw 2mL of the prepared nanosphere dispersion.

[0038] Step 2: Cut the silicon wafer into 1×1cm 2 The size of the substrate was pre-sonicated in absolute ethanol, acetone, chloroform, and deionized water for 15 min, respectively, and then boiled in piranha solution and ammonia solution for 30 min for super-hydrophilic treatment.

[0039] Step 3: Connect the syringe to the infusion line, and connect the other end of the infusion line to the ultrasonic spray head. At the same time, a disposable lunch box is used to hold about 2 / 3 of deionized water, and the processed silicon wafer substrate is pre-placed under the water surface at a distance of 5 mm from the water surface and inclined at 15°.

[0040] Step 4: Set the liquid volume of the syringe pump to 0.3m...

Embodiment 2

[0045]Step 1: Dilute the PS nano-microsphere stock solution (particle size 1054 nm, concentration 2.5 wt%) with absolute ethanol in a volume ratio of 1:1.2, followed by ultrasonic vibration for 5 min. Use a 10mL syringe to draw 5mL of the prepared nanosphere dispersion.

[0046] Step 2: Cut the glass into 1×1cm 2 The size of the substrate was pre-sonicated in absolute ethanol, acetone, chloroform, and deionized water for 15 min, and then boiled in piranha solution for 30 min for hydrophilic treatment.

[0047] Step 3: Connect the syringe to the infusion line, and connect the other end of the infusion line to the ultrasonic spray head. At the same time, use a disposable lunch box to hold about 2 / 3 of deionized water, and pre-place the treated glass sheet substrate 5mm below the water surface to keep it level.

[0048] Step 4: Set the volume of the syringe pump to 1.5mL and the injection speed to 5mL / h. Turn on the syringe pump, and turn on the control power of the nozzle sim...

Embodiment 3

[0053] Step 1: First, mix PS nano-microsphere stock solution 1 (particle size 310nm, concentration 2.5wt%) and PS nano-microsphere stock solution 2 (particle size 1054nm, concentration 2.5wt%) according to the volume ratio V S / L = 0.051 for mixing, then dilute with absolute ethanol at a volume ratio of 1:1.2, and ultrasonically disperse for 5 min. Use a 10mL syringe to draw 5mL of the prepared nanosphere dispersion.

[0054] Step 2: Cut the glass into 1×1cm 2 The size of the substrate was pre-sonicated in absolute ethanol, acetone, chloroform, and deionized water for 15 min, and then boiled in piranha solution for 30 min for hydrophilic treatment.

[0055] Step 3: Connect the syringe to the infusion line, and connect the other end of the infusion line to the ultrasonic spray head. At the same time, use a disposable lunch box to hold about 2 / 3 of deionized water, and pre-place the treated glass sheet substrate 5mm below the water surface to keep it level.

[0056] Step 4: Se...

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Abstract

The invention discloses a method for preparing a large-area single-layer colloidal crystal template by ultrasonic spraying. The method is based on the air-water two-phase interface, and the colloidal crystal dispersion is uniformly applied to the water surface in the form of ultrasonic spraying. After the dispersion liquid droplets reach the water surface Under the effect of the Marangoni effect, it spreads rapidly to the surroundings. Colloidal crystals rapidly expand into monolayers in the laminar flow motion at the interface, and then self-assemble into tightly packed monolayer colloidal crystal templates under the action of capillary forces. The invention is expected to completely reverse the current difficult situation of obtaining large-area single-layer colloidal crystal templates, and provides an efficient, simple, practical and low-cost technical approach for the preparation of two-dimensional periodic surface nanostructures.

Description

technical field [0001] The invention belongs to the field of self-assembly of single-layer colloidal crystal templates, in particular to a method for preparing large-area single-layer colloidal crystal templates by ultrasonic spraying. Background technique [0002] Two-dimensional periodic surface nanostructures have extremely broad applications in photonics, electronics, biochemical sensing, and optoelectronics. The traditional methods for preparing two-dimensional periodic surface nanostructures mainly include electron beam lithography, X-ray lithography, extreme ultraviolet lithography, excimer lithography, etc. The above technologies are not only expensive, but also difficult to achieve large-scale. Productivity. In recent years, various 2D periodic surface nanostructures have been obtained by self-assembly of monolayer colloidal crystal templates at the air / water interface, followed by wet etching. At present, the methods for preparing large-area monolayer colloidal c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B5/00C30B29/58
CPCC30B5/00C30B29/58Y02P70/50
Inventor 张文超宋长坤陈俊宏徐建勇朱俊武石伟杨蓉蓉俞春培
Owner NANJING UNIV OF SCI & TECH
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