CN103031610A

CN103031610A - Method for preparing single ultra-long Cu nanowire and measuring electrical properties of the nanowire

Info

Publication number: CN103031610A
Application number: CN201210523764XA
Authority: CN
Inventors: 朱开贵; 王武
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2012-12-07
Filing date: 2012-12-07
Publication date: 2013-04-10

Abstract

The invention discloses a method for preparing a single ultra-long Cu nanowire and simply and effectively preparing electrodes at the two ends of the nanowire to measure the electrical properties of the nanowire. The method mainly comprises the following steps of: (1) preparation of a single ultra-long Cu (NO3) 2/PVA precursor nanofiber: firstly, a Cu (NO3) 2/PVA solution with certain concentration is prepared, the solution is filled into a syringe in an electrostatic spinning apparatus, and electrospinning is added between a needle head and an aluminum foil collecting plate; a U-shaped copper sheet is put on the collecting plate for collection for 2 seconds to obtain a precursor nanofiber across the two ends of the copper sheet, and the precursor nanofiber is collected with a glass slide with a notch; (2) preparation of a single Cu nanowire: the precursor nanofiber obtained in the step (1) is subjected to heat treatment under suitable conditions; and (3) preparation of electrodes at the two ends of the single Cu nanowire: an appropriate amount of conductive sliver paste is dripped on the two ends of the notch on the glass slide, so that the notch is naturally cured.

Description

A kind of method for preparing single overlength Cu nano wire and measure its electric property

Technical field

Patent of the present invention belongs to microelectronic circuit and devices field, relates to a kind ofly preparing single super long copper nano wire by electrostatic spinning technique, and prepares simply and effectively the method that electrode is used for measuring its electric property.

Background technology

Electrostatic spinning technique is to prepare at present one of most important method of nanofiber.Because it can be simply, direct, continuous production polymer, metal and oxidate nano fiber thereof, thereby become study hotspot both domestic and external.The basic device of electrostatic spinning (Fig. 1) is comprised of high voltage source, micro pump, syringe, syringe needle, gathering-device five parts.Its principle is that polymer solution or melt are applied several thousand to several ten thousand volt high-pressure electrostatics, when the electric field force in polymer solution or the melt overcomes its surface tension, under the electric field force effect, spray and form one stable jet, drawing-off and division along with jet, after final solvent volatilization or melt solidified, high polymer fibre sank and forms the micro nanometer fiber material of similar nonwoven fabric at collecting board.

Goal of the invention

The object of the invention is to prepare single overlength Cu (NO by specific collection method in conjunction with electrostatic spinning technique ₃) ₂/ PVA forerunner nanofiber carries out suitable heat treatment to forerunner's nanofiber subsequently and obtains single overlength Cu nano wire, prepares at last electrode at the nano wire two ends and is used for measuring its electric property.

Summary of the invention

Technical problem to be solved by this invention is, a kind of method for preparing single overlength Cu nano wire is provided, and prepares simply and effectively the method that electrode is used for measuring its electric property at its two ends.

(1) single overlength Cu (NO ₃) ₂The preparation of/PVA forerunner nanofiber

Prepare certain density Cu (NO ₃) ₂/ PVA precursor aqueous solution is packed solution in the syringe in the electrostatic spinning apparatus into, and electrospinning adds high pressure between syringe needle and collecting board.With an interblock 2 seconds of collection spinning on the collecting board that is placed on syringe needle below for U-shaped (Fig. 2) copper sheet of 1.7cm, can obtain an overlength Cu (NO ₃) ₂Forerunner's nanofiber of/PVA is horizontal in copper sheet two ends (Fig. 3), then is about 1.5cm, is with impressed slide that forerunner's nano wire is collected indentation next door (Fig. 4) with a slice width.

(2) preparation of single Cu nano wire

The forerunner's nano wire (diameter 500nm, the about 1.5cm of length) that obtains in (1) is carried out the heat treatment first time first in air, heat-treat condition is: the heating rate with 2 ℃/min is heated to 350 ℃ of insulation 30min, allows it naturally cool to room temperature again.Subsequently with the nano wire (diameter 300nm, the about 1.5cm of length) that obtains at H ₂Carry out the heat treatment second time in the atmosphere, heat-treat condition is: the heating rate with 2 ℃/min is heated to 400 ℃ of insulation 30min, allows it naturally cool to room temperature again.Can obtain single overlength Cu nano wire (diameter 100nm, the about 1.5cm of length).

(3) preparation of single Cu nano wire two end electrodes

(2) the Cu nanowire diameter that obtains in is about 100nm, naked eyes can't be seen, but allow nano wire be collected in the indentation next door (Fig. 4) that with the naked eye to see during owing to collection, can prepare electrode so we only need to drip at the indentation two ends an amount of conductive silver glue.

(4) measure electric property.Electric property with the single Cu nano wire of professional apparatus measures.

Description of drawings

Fig. 1 represents electrostatic spinning apparatus;

Fig. 2 represents U-shaped copper sheet top view;

Fig. 3 represents that forerunner's nano wire is across at U-shaped copper sheet two ends;

Fig. 4 represents forerunner's nanofiber of collecting on the slide.Wherein white line is indentation, and black line is nanofiber.

The specific embodiment

The below elaborates to embodiments of the invention, and present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed embodiment and specific operation process, but protection scope of the present invention is not limited to following embodiment.

Present embodiment may further comprise the steps:

(1) Cu (NO ₃) ₂The preparation of/PVA precursor liquid

With the 0.3gPVA(polyvinyl acetate, Mw=89,000～98,000, Aldrich) add in the 3.45g deionized water, add 0.56g Cu (NO after under 80 ℃, stirring 2h with magnetic stirrer ₃) ₂(Mw=187.56, Aldrich) stirs 8h again and obtains Cu (NO ₃) ₂/ PVA precursor liquid.

(2) electrostatic spinning process

In the spinning process, the syringe needle model is No. 6 syringe needles, and external diameter 0.6mm, collecting board are aluminium foil.Syringe needle is 18cm to the collecting board distance, and voltage is 20KV.

Claims

1. a method for preparing single overlength Cu nano wire and measure its electric property is characterized in that step is: (1) single overlength Cu (NO ₃) ₂The preparation of/PVA forerunner nanofiber.(2) preparation of single Cu nano wire.(3) preparation of single Cu nano wire two end electrodes.(4) with its electric property of apparatus measures.

2. according to the single overlength Cu nano wire of the described preparation of claim (1) and measure the method for its electric property, it is characterized in that collecting in the process of forerunner's nanofiber with width is the U-shaped copper sheet of 1.7cm.

3. according to claim (1) and the single overlength Cu nano wire of (2) described preparation and measure the method for its electric property, it is characterized in that the collecting board of forerunner's nano wire before heat-treating is a width 1.5cm, is with impressed slide, and forerunner's nanofiber is collected near the indentation.

4. according to claim (1), the single overlength Cu nano wire of (2) and (3) described preparation and measure the method for its electric property, when it is characterized in that preparing electrode at the copper nano-wire two ends, can directly drip an amount of conductive silver glue at the indentation two ends and realize.

The content that is not described in detail in the specification of the present invention belongs to the known prior art of this area professional and technical personnel.