CN101624175A - Controllable synthesis method of hetero-structure of cadmium sulfide/multi-walled carbon nanotube shell core - Google Patents

Abstract

The invention discloses a controllable synthesis method of a hetero-structure of a cadmium sulfide/multi-walled carbon nanotube shell core, which comprises the following steps: taking a multi-walled carbon nanotube, tetrahydrated cadmium nitrate, thioacetamide and absolute ethanol as raw materials, dispersing MWCNTs into the absolute ethanol solution at the room temperature, and ultrasonically processing until the ethanol volatilizes absolutely; pouring 80ml of deionized water into the solution, and ultrasonically processing continuously; pouring 0.003mol of tetrahydrated cadmium nitrate and 0.03mol of thioacetamide into the solution, and stirring until absolute dissolving; transferring the solution into a closed vessel, and heating for 10min-3.5h under the condition of 40-80 DEG C; centrifuging the product after the reaction is finished, washing for a plurality of times by the deionized water and the absolute ethanol, and drying at the room temperature to obtain the finished product. The controllable synthesis method can prepare the hetero-structure of the cadmium sulfide/multi-walled carbon nanotube shell core with the controlled thickness of the cadmium sulfide shell. The structure can be applied in the fields of nano optoelectronic devices, solar batteries, and the like.

Description

The controllable synthesis method of cadmium sulfide/multi-walled carbon nanotube shell core heterojunction structure

Technical field

The present invention relates to a kind of preparation of heterogeneous structural nano material, particularly relate to the controllable synthesis method of a kind of cadmium sulfide/multi-walled carbon nanotube shell core heterojunction structure.

Background technology

Utilize covalently or non-covalently modification, the surface of CNT is modified, the shell core heterojunction structure based on CNT that obtains has potential application in fields such as energy storage, an emission and pliable and tough electronic devices.Because the excellent geoelectricity of CNT is mechanical property particularly, also be research shell nanotube at one dimension constraints (CNT of the core) ideal model of stable appearance (as the Rayleigh unstability etc.) down based on the heterojunction structure of CNT.In addition, the thickness of shell has material impact to the photoinduction charge transfer behavior of shell stable appearance and heterojunction structure, and at present under the condition of gentleness, the preparation shell thickness evenly and the carbon nanotube-based heterojunction structure of controllable thickness remain a challenge.Cadmium sulfide (CdS) is an a kind of typical II-VI family semiconductor, is widely used in solar cell, light emission and feds.The new characteristic that CdS/ multi-walled carbon nano-tubes (MWCNTs) shell core heterojunction structure possesses the excellent properties of the two simultaneously and brings because of coupling can be used to prepare nano photoelectronic devices of future generation.Usually need carry out pre-treatment (as pickling) to MWCNTs, add surfactant or organic bridge molecule, to strengthen the interaction between CdS and the MWCNTs, but this can weaken the electron transport ability between CdS and the MWCNTs, and formed CdS shell skewness, thickness can not well be controlled, and the productive rate of heterojunction structure is also lower.

Summary of the invention

In order to overcome the prior art above shortcomings, the invention provides the controllable synthesis method of a kind of cadmium sulfide/multi-walled carbon nanotube shell core heterojunction structure.This method is carried out at low temperatures, have the preparation method easy, be swift in response and advantage such as manufacturing cycle is short.

The present invention is achieved by the following technical solution: it is raw material that this method adopts multi-walled carbon nano-tubes (MWCNTs), four nitric hydrate cadmiums (Cd (NO3) 24H2O), thioacetamide (CH3CSNH2), absolute ethyl alcohol (C2H5OH) and deionized water, and carries out according to following steps:

A. at room temperature, 0.01-0.5g MWCNTs is scattered in the ethanol solution, ultrasonic processing is volatilized fully until ethanol; Continue ultrasonic processing to wherein pouring the 80-100ml deionized water into again;

B. Cd (NO3) 24H2O and CH3CSNH2 are poured in the above-mentioned solution, constantly stir, make it to dissolve fully;

C. above-mentioned solution is transferred in the closed container of 100ml capacity, under 40 ℃～80 ℃ conditions, heated 10min～3.5h.After reaction finishes that product is centrifugal, clean some times at room temperature dry getting final product with deionized water and absolute ethyl alcohol.

The invention has the beneficial effects as follows: the present invention is leniently carrying out (40 ℃～80 ℃) under the condition, raw materials used being easy to get, and the preparation method is easy, and productive rate is higher; Need not carry out pre-treatment (as pickling) to MWCNTs, need not add any surfactant or organic bridge molecule, can realize mutually combining between CdS and the MWCNTs; By changing response parameter, can control the thickness of CdS shell easily.This invention can be applicable to fields such as nano photoelectronic devices, solar cell.

Description of drawings

Fig. 1 is the field emission scanning electron microscope photo of former primary state MWCNTs;

Fig. 2 is the field emission scanning electron microscope photo of the CdS/MWCNTs shell core heterojunction structure of embodiment 1;

Fig. 3 is the field emission scanning electron microscope photo of the CdS/MWCNTs shell core heterojunction structure of embodiment 2;

Fig. 4 is the field emission scanning electron microscope photo of the CdS/MWCNTs shell core heterojunction structure of embodiment 3;

Fig. 5 is the field emission scanning electron microscope photo of the CdS/MWCNTs shell core heterojunction structure of embodiment 4.

The specific embodiment

Embodiment 1:CdS shell is thick to be the CdS/MWCNTs shell core heterojunction structure of 35nm

At room temperature, 0.05g MWCNTs (see figure 1) is scattered in the ethanol solution, the ultrasonic processing to ethanol volatilized fully; Continue ultrasonic processing to wherein pouring the 80ml deionized water into again.0.003molCd (NO3) 24H2O and 0.03mol CH3CSNH2 are poured in the above-mentioned solution, constantly stir, make it to dissolve fully.Above-mentioned solution is transferred in the closed container of 100ml capacity, under 60 ℃ of conditions, heated 3.5h.After reaction finishes that product is centrifugal, clean some times with deionized water and absolute ethyl alcohol, at room temperature drying gets final product (see figure 2).

Embodiment 2:CdS shell is thick to be the CdS/MWCNTs shell core heterojunction structure of 25nm

At room temperature, 0.05g MWCNTs (see figure 1) is scattered in the ethanol solution, the ultrasonic processing to ethanol volatilized fully; Continue ultrasonic processing to wherein pouring the 80ml deionized water into again.0.003molCd (NO3) 24H2O and 0.03mol CH3CSNH2 are poured in the above-mentioned solution, constantly stir, make it to dissolve fully.Above-mentioned solution is transferred in the closed container of 100ml capacity, under 60 ℃ of conditions, heated 2.0h.After reaction finishes that product is centrifugal, clean some times with deionized water and absolute ethyl alcohol, at room temperature drying gets final product (see figure 3).

Embodiment 3:CdS nano particle is modified the CdS/MWCNTs shell core heterojunction structure on MWCNTs surface

At room temperature, 0.05g MWCNTs (see figure 1) is scattered in the ethanol solution, the ultrasonic processing to ethanol volatilized fully; Continue ultrasonic processing to wherein pouring the 80ml deionized water into again.0.003molCd (NO3) 24H2O and 0.03mol CH3CSNH2 are poured in the above-mentioned solution, constantly stir, make it to dissolve fully.Above-mentioned solution is transferred in the closed container of 100ml capacity, under 60 ℃ of conditions, heated 10min.After reaction finishes that product is centrifugal, clean some times with deionized water and absolute ethyl alcohol, at room temperature drying gets final product (see figure 4).

Embodiment 4:CdS shell is thick to be the CdS/MWCNTs shell core heterojunction structure of 10nm

At room temperature, 0.05g MWCNTs (see figure 1) is scattered in the ethanol solution, the ultrasonic processing to ethanol volatilized fully; Continue ultrasonic processing to wherein pouring the 80ml deionized water into again.0.003molCd (NO3) 24H2O and 0.03mol CH3CSNH2 are poured in the above-mentioned solution, constantly stir, make it to dissolve fully.Above-mentioned solution is transferred in the closed container of 100ml capacity, under 40 ℃ of conditions, heated 3.5h.After reaction finishes that product is centrifugal, clean some times with deionized water and absolute ethyl alcohol, at room temperature drying gets final product (see figure 5).

Claims (1)

1. the controllable synthesis method of cadmium sulfide/multi-walled carbon nanotube shell core heterojunction structure, it is characterized in that: described method comprises the steps:

A. at room temperature, 0.01-0.5g MWCNTs is scattered in the ethanol solution, ultrasonic processing is volatilized fully until ethanol; Continue ultrasonic processing to wherein pouring the 80-100ml deionized water into again;

B. four nitric hydrate cadmiums [Cd (NO3) 24H2O] and thioacetamide [CH3CSNH2] are poured in the above-mentioned solution, constantly stirred, make it to dissolve fully;

C. above-mentioned solution is transferred in the closed container of 100ml capacity, under 40 ℃～80 ℃ conditions, heated 10min～3.5h.After reaction finishes that product is centrifugal, clean some times at room temperature dry getting final product with deionized water and absolute ethyl alcohol.

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