Preparation method of oxygen-doped zigzag graphene nanobelt

Abstract

The invention relates to a preparation method of an oxygen-doped zigzag graphene nanobelt, and belongs to the technical field of nano materials. Preparing a gold single crystal substrate; 1, 5-dibromonaphthene-2, 6-diol precursor molecules are evaporated and deposited on a gold single crystal substrate to obtain a substrate and a two-dimensional DBNDO self-assembly network structure deposited on the substrate, and the temperature of the DBBPA self-assembly structure on the substrate and the temperature of the gold single crystal substrate are controlled to range from 25 DEG C to 30 DEG C in the deposition process; and heating the substrate and the DBNDO self-assembled network structure deposited on the substrate for the first time to a growth temperature, keeping the temperature, and performing annealing treatment to obtain a product after Ullmann reaction and dehydrocyclization reaction. The method provides a new thought for accurately preparing the oxygen-doped zigzag graphene nanobelt, and has relatively high scientific research value and application potential.

Description

TECHNICAL FIELD

[0001] The present application relates to a preparation method of oxygen-doped sawtooth graphene nanoribbons, and belongs to the technical field of nanomaterials. BACKGROUND

[0002] The oxygen-doped sawtooth graphene nanoribbon is a graphene nanoribbon with a sawtooth-shaped edge composed of oxygen atoms. According to the current research, the use of heteroatom substitution doping provides extensive opportunities for reasonably adjusting the physical and catalytic properties of the nanoribbon and the chemical selectivity. The periodic embedding of heteroatoms into the lattice of the nanoribbon is conducive to the conjugation of the system, and thus affects the local electronic environment around the doped atoms. This process can effectively change the arrangement of the energy band structure and the band gap, thereby introducing a doped state and changing the local reactivity. Oxygen atom doping usually has special functionality, such as drug delivery, catalysis, optoelectronics, etc., which makes it have important applications in the fields of medicine, materials science and electronics. In addition, through suitable synthesis methods and reaction conditions, the molecular structure, molecular weight and molecular distribution of the oxygen-doped graphene nanoribbon can be accurately controlled, so as to regulate its performance. At present, the synthesis and research of oxygen-doped sawtooth graphene nanoribbons are mostly based on solution chemistry, which makes the synthesis more complex, requiring fine synthesis strategies and conditions, and the preparation process is time-consuming and energy-consuming. Due to the complexity of its structure, factors such as intermolecular interaction and spatial configuration need to be fully considered in the design and synthesis, which is difficult. SUMMARY

[0003] In view of the problems and deficiencies of the prior art, the present application provides a preparation method of oxygen-doped sawtooth graphene nanoribbons. The present application utilizes the strategy that the 1,5-dibromonaphthalene-2,6-diol (DBNDO) precursor molecule will undergo a graded chemical reaction to form a sawtooth graphene nanoribbon under the catalytic induction of a gold substrate. The DBNDO precursor molecule is deposited onto the surface of the gold substrate to obtain a sample with a DBNDO self-assembly structure on the gold substrate. The sample is heated to a growth temperature, and then the sample is subjected to a series of annealing treatments at different temperatures. Finally, the oxygen-doped sawtooth graphene nanoribbon is obtained.

[0004] The present application is realized by the following technical solutions.

[0005] A preparation method of oxygen-doped sawtooth graphene nanoribbons, comprising the following steps: Step 1, preparing a gold single crystal substrate; Step 2, 1, 5-dibromonaphthalene-2, 6-diol (DBNDO) precursor molecules are evaporated and deposited on the gold single crystal substrate of step 1 to obtain a substrate and a two-dimensional DBNDO self-assembled network structure deposited on the substrate, and the deposition process controls the temperature of the DBBPA self-assembled structure and the gold single crystal substrate on the substrate to be 25-30 DEG C; Step 3, the substrate and the DBNDO self-assembled network structure deposited on the substrate of step 2 are subjected to a first temperature rise to a growth temperature and are annealed to obtain the product after the Ullmann reaction and the dehydrogenation cyclization reaction.

[0006] The preparation process of the gold single crystal substrate in step 1 is specifically: Step 1.1, in the ultra-high vacuum cavity, the gold substrate is subjected to argon ion sputtering treatment to obtain a gold substrate; Step 1.2, the gold substrate obtained in step 1.1 is heated to 340 DEG C and is kept for 20-30 min to obtain a gold single crystal substrate.

[0007] The evaporation temperature of the 1, 5-dibromonaphthalene-2, 6-diol precursor molecules in step 2 is 40 DEG C, and the deposition time is 3-5 min.

[0008] The growth temperature in step 3 is 180-260 DEG C, and the temperature is kept for 20-60 min.

[0009] The annealing temperature in step 3 is 200-300 DEG C, the annealing temperature rise rate includes but is not limited to 10 DEG C / min, the temperature is kept for 10-30 min, and finally the temperature is lowered at a rate of 10-20 DEG C / min.

[0010] The beneficial effects of the present application are: (1) The present application can prepare oxygen-doped sawtooth-shaped graphene nanobelt products, and the internal structure of the product is one-dimensional order. (2) The oxygen-doped sawtooth-shaped graphene nanobelt product prepared by the present application is a one-dimensional covalent structure constructed by taking each DBNDO molecule as a component unit after Ullmann coupling and dehydrogenation cyclization. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is the reaction path diagram proposed by the embodiment of the present application; Figure 2 is the scanning tunneling microscope high-resolution image (a, b), the key resolution scanning tunneling microscope image (c), the atomic force microscope image (d) and the model structure diagram (e) of the oxygen-doped sawtooth-shaped graphene nanobelt prepared by the embodiment of the present application; Figure 3The electrical property of the oxygen-doped sawtooth graphene nanoribbons is characterized by the embodiment of the present application. DETAILED DESCRIPTION

[0012] The present application is further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] Low temperature scanning tunneling microscope: purchased from Omicron, Germany.

[0014] K-cell molecular evaporation source: purchased from Omicron, Germany.

[0015] Argon ion gun: purchased from Omicron, Germany.

[0016] 1,5-dibromonaphthalene-2,6-diol (DBNDO) precursor molecule: purchased from Bide Pharmaceutical, purity 97%.

[0017] Gold single crystal: purchased from MaTecK, purity 99.999%. Embodiment 1

[0018] The preparation method of the oxygen-doped sawtooth graphene nanoribbons includes the following steps: Step 1, preparing a gold single crystal substrate; the preparation process of the gold single crystal substrate is specifically as follows: Step 1.1, performing argon ion sputtering treatment on the gold substrate in an ultrahigh vacuum cavity to obtain a gold substrate; Step 1.2, heating the gold substrate obtained in step 1.1 to 340℃ and keeping the temperature for 20 min to obtain a gold single crystal substrate; Step 2, evaporating and depositing 5 mg of 1,5-dibromonaphthalene-2,6-diol (DBNDO) precursor powder at an evaporation temperature of 40℃ by using a thermal resistance K-cell molecular evaporation source on the gold single crystal substrate in step 1 to obtain a substrate and a two-dimensional DBNDO self-assembled network structure deposited on the substrate; the DBBPA self-assembled structure on the substrate and the gold single crystal substrate temperature are controlled to 30℃ during the deposition process, and the deposition time is 3 min; Step 3, performing first temperature rising to the growth temperature for the substrate and the DBNDO self-assembled network structure deposited on the substrate in step 2; the growth temperature is 200℃, and the temperature keeping time is 20 min; the annealing temperature in step 3 is 300℃, the annealing temperature rising rate is 10℃ / min, the temperature keeping time is 10 min, and finally the temperature is decreased to room temperature at a rate of 10℃ / min; to obtain the product after the Ullmann reaction and the dehydrogenation cyclization reaction.

[0019] The reaction path of the oxygen-doped sawtooth graphene nanoribbons prepared in this embodiment is as shown in Figure 1 Figure 1 ​It can be seen that the product of this invention is obtained by a series of reactions after the precursor molecules modified with bromine atoms and hydroxyl groups are heated and annealed on an Au(111) substrate to obtain oxygen-doped serrated graphene nanoribbons.

[0020] High-resolution scanning tunneling microscope image of the oxygen-doped serrated graphene nanoribbons prepared in this example ( Figure 2 a, b, c), atomic force microscope images ( Figure 2 d) and model structure diagram ( Figure 2 e). From Figure 2 The detailed structural information of the oxygen-doped serrated graphene nanoribbons prepared by the example preparation method according to the present invention can be directly and effectively demonstrated.

[0021] Figure 3 The electrical properties of oxygen-doped zigzag graphene nanoribbons prepared by the method according to an embodiment of the present invention are shown. The first-order differential spectrum shows the electronic structure of the oxygen-doped zigzag graphene nanoribbons, and the electronic state density distribution also proves its edge states.

[0022] The specific embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for preparing oxygen-doped sawtooth graphene nanoribbons, characterized by the steps of The application relates to a method for preparing a two-dimensional self-assembly network structure of 1,5-dibromonaphthalene-2,6-diol (DBNDO) on a gold single crystal substrate, which comprises the following steps: Step 1, preparing a gold single crystal substrate; Step 2, evaporating and depositing 1,5-dibromonaphthalene-2,6-diol precursor molecules on the gold single crystal substrate prepared in step 1 to obtain a substrate and a two-dimensional DBNDO self-assembly network structure deposited on the substrate, wherein the deposition process controls the temperature of the DBBPA self-assembly structure on the substrate and the gold single crystal substrate to be 25-30 DEG C; Step 3, performing a first temperature rising on the substrate and the two-dimensional DBNDO self-assembly network structure deposited on the substrate in step 2 to a growth temperature, and performing an annealing treatment to obtain a product after an Ullmann reaction and a dehydrogenation cyclization reaction.

2. The method for preparing oxygen-doped serrated graphene nanoribbons according to claim 1, characterized in that: The preparation process of the gold single crystal substrate in step 1 is as follows: Step 1.1, performing argon ion sputtering treatment on a gold substrate in an ultrahigh vacuum cavity to obtain a gold substrate; Step 1.2, heating the gold substrate obtained in step 1.1 to 340 DEG C and keeping the temperature for 20-30 min to obtain a gold single crystal substrate.

3. The method for preparing oxygen-doped serrated graphene nanoribbons according to claim 1, characterized in that: The evaporation temperature of the 1,5-dibromonaphthalene-2,6-diol precursor molecules in step 2 is 40 DEG C, and the deposition time is 3 min-5 min.

4. The method for preparing oxygen-doped serrated graphene nanoribbons according to claim 1, characterized in that: The growth temperature in step 3 is 180-260 DEG C, and the temperature keeping time is 20-60 min.

5. The method for preparing oxygen-doped serrated graphene nanoribbons according to claim 1, characterized in that: The annealing temperature in step 3 is 200-300 DEG C, the annealing temperature rising rate includes but is not limited to 10 DEG C / min, the temperature keeping time is 10-30 min, and finally the temperature is decreased at a rate of 10-20 DEG C / min.

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