A method for preparing carbon nanotubes by hydrothermal method

Abstract

The application discloses a hydrothermal method for preparing carbon nanotubes, and belongs to the technical field of nanometer material preparation.The preparation method comprises the following steps: placing graphene oxide (GO) powder in deionized water, and obtaining a GO solution through ultrasonic treatment; adding dilute hydrochloric acid into the GO solution to obtain an acidified GO solution; and placing the acidified GO solution into a reaction kettle, and obtaining carbon nanotubes under the condition of a reaction temperature of 200 DEG C and a reaction time of 2 hours.The method uses graphene oxide as a source, and utilizes the self-rolling effect of graphene oxide under weak acid hydrothermal conditions, so that a catalyst and strong acid do not need to be introduced, the preparation process is simple, and the method is beneficial to the application of the carbon nanotubes in the fields of catalyst carriers and energy storage.

Description

Technical Field

[0001] This invention relates to the field of nanomaterial preparation technology. Specifically, it relates to a hydrothermal method for preparing carbon fibers and carbon nanotubes. Background Technology

[0002] Since the discovery of carbon nanotubes in 1991, they have shown great potential applications in field emission devices, micro-devices, energy storage, and catalysis due to their excellent field emission performance, high tensile strength and toughness, excellent conductor and semiconductor properties, strong adsorption properties, wave absorption function, and high specific surface area.

[0003] Currently, there are three main methods for preparing carbon nanotubes: graphite arc method, catalytic pyrolysis method (also known as CVD method), and laser ablation method. In recent years, hydrothermal preparation methods have also emerged, mainly using organic materials such as glucose and sucrose as carbon sources, and introducing catalysts and strong acids under high temperature and high pressure conditions to prepare carbon nanotubes. Summary of the Invention

[0004] This invention provides a method for preparing carbon nanotubes using a hydrothermal method.

[0005] The specific steps of this invention are as follows:

[0006] Step 1: Place 1 mg of graphene oxide (GO) powder in 100 ml of deionized water and sonicate for 20 minutes to obtain a GO solution;

[0007] Step 2: Add 10 μl of dilute hydrochloric acid to 20 ml of the GO solution obtained in Step 1 to obtain an acidified GO solution, wherein the mass fraction of hydrogen chloride in the dilute hydrochloric acid is 0.1%;

[0008] Step 3: Place the acidified GO solution obtained in Step 2 into a reaction vessel, react at 200℃ for 2 hours to obtain carbon nanotubes;

[0009] The GO powder was purchased from Xianfeng Nano, model number: XF002-2.

[0010] This invention utilizes graphene oxide as a source, taking advantage of the self-coiling effect of graphene oxide under weakly acidic hydrothermal conditions. Therefore, it eliminates the need for catalysts and strong acids, resulting in a simple preparation process with mild reaction conditions and a simple chemical composition. Furthermore, the carbon nanotubes obtained by this method have large diameters, good dispersibility, and abundant oxide group sites on their surfaces, distributed between 30-50 nm, which is beneficial for their application in catalyst supports and energy storage. Detailed Implementation

[0011] The invention will be further explained below with reference to specific implementations.

[0012] 1 mg of GO powder (Xianfeng Nano, XF002-2) was placed in 100 ml of deionized water and sonicated for 20 minutes to obtain a GO solution. 10 μl of dilute hydrochloric acid (hydrogen chloride mass fraction: 0.1%) was added dropwise to 20 ml of the GO solution to obtain an acidified GO solution. The acidified GO solution was then placed in a 25 ml reactor and reacted at 200℃ for 2 hours. The carbon nanotubes were then obtained.

[0013] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make corresponding modifications and improvements based on the present invention without departing from its spirit and essence, such as adjusting the degree of acidification, reaction temperature, and reaction time; however, all such modifications and improvements should fall within the protection scope of the appended claims.

Claims

1. A method for preparing carbon nanotubes via hydrothermal synthesis, comprising the following specific steps: Step 1: Place 1 mg of XF002-2 Xianfeng Nano GO powder in 100 ml of deionized water and sonicate for 20 minutes to obtain a GO solution; Step 2: Add 20 ml of the GO solution obtained in Step 1 to 10 μl of dilute hydrochloric acid with a hydrogen chloride mass fraction of 0.1% to obtain an acidified GO solution; Step 3: Place the acidified GO solution obtained in Step 2 into a 25ml reaction vessel, react at 200℃ for 2 hours to prepare carbon nanotubes.