CN111445930B

CN111445930B - Method for high-density information storage by using tetraphenylporphyrin molecules

Info

Publication number: CN111445930B
Application number: CN202010163748.9A
Authority: CN
Inventors: 蔡金明; 达彬彬; 郝振亮; 卢建臣
Original assignee: Kunming University of Science and Technology
Current assignee: Kunming University of Science and Technology
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2021-07-23
Anticipated expiration: 2040-03-10
Also published as: CN111445930A

Abstract

The invention relates to the technical field of two-dimensional materials and organic molecule information storage, in particular to a high-density information storage method by utilizing tetraphenylporphyrin molecules, which comprises the following steps: (1) calibrating an Au (111) substrate by using a rectangular coordinate system; (2) defining that a benzene ring in tetraphenylporphyrin molecules forms a chemical bond to the left position and an information value of 0, and forms a chemical bond to the right position and an information value of 1; (3) inducing a specific site for forming a chemical bond by a scanning tunnel microscope in an experimental environment; (4) information reading is performed by a scanning tunnel microscope. The single tetraphenylporphyrin molecule adopted by the invention has 16 bits, and the storage density is very high; once the information is stored in the storage mode, the information cannot be erased, so that the information safety is extremely high; the organic molecules as the storage medium obviously reduce the volume of the storage device and are more convenient to carry.

Description

Method for high-density information storage by using tetraphenylporphyrin molecules

Technical Field

The invention relates to the technical field of two-dimensional materials and organic molecule information storage, in particular to a method for storing high-density information by using tetraphenylporphyrin molecules.

Background

With the advent of the information age and the rapid development of IT technology, a large amount of generated information is increasing explosively, and in order to meet the requirement of information storage, the existing low-density storage media are difficult to avoid and will be challenged, and in order to solve the problem, the high-density storage media become a focus which needs to be solved urgently.

Current major storage technologies include magnetic storage (e.g., magnetic disks, tapes, etc.) and optical storage (e.g., CDs, DVDs, etc.); of course, some emerging memories have been developed in recent years, mainly: ferroelectric memory (FRAM), Magnetic Random Access Memory (MRAM); although improvements are made in the stability and speed of information storage, there is still no breakthrough progress for the storage of large amounts of information.

Tetraphenylporphyrin molecules, in which the central porphyrin macrocycle is a highly conjugated system, have unique electronic properties; when the porphyrin molecule is connected with four benzene rings as substituents, more special physicochemical properties can be formed.

In a vacuum environment, the tetraphenylporphyrin molecule can be induced to directionally generate cyclodehydrogenation reaction through a scanning tunnel microscope needle point, and different cyclization configurations have different information storage positions: 0 or 1, and then imaged by a scanning tunneling microscope, thereby reading corresponding stored information, which is highly safe and has an extremely high information storage density.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a potential application of a high-density information storage method by utilizing tetraphenylporphyrin molecules, so as to make up the defect that the conventional information storage material cannot meet the high-density information storage aspect, and improve the safety of information storage.

The technical scheme of the invention is as follows:

a method for high-density information storage by using tetraphenylporphyrin molecules comprises the following steps:

(1) calibrating an Au (111) substrate by using a rectangular coordinate system;

(2) defining that a benzene ring in tetraphenylporphyrin molecules forms a chemical bond to the left position and an information value of 0, and forms a chemical bond to the right position and an information value of 1;

(3) inducing a specific site for forming a chemical bond by a scanning tunnel microscope in an experimental environment;

(4) information reading is performed by a scanning tunnel microscope.

Preferably, in the step (1), the Au (111) substrate is single-crystal gold having a crystal orientation [111 ].

Preferably, in the step (2), the tetraphenylporphyrin has a molecular purity of 97%.

Preferably, in the step (2), the

information value

0 or 1 represents one bit (bit) in a binary system, and the bit is the minimum unit of data storage.

Preferably, in the step (2), the probability that the tetraphenylporphyrin molecule forms a 0 or 1 signal value is equivalent.

Preferably, in the step (2), the 0 or 1 signal value cannot be erased once formed.

Preferably, in the step (3), the experimental environment is an ultra-high vacuum environment, and the vacuum degree is maintained at 1 × 10¹⁰Above mbar.

Preferably, in the step (3), the directional induction may be achieved by applying a bias voltage at a specific position through the scanning tunneling microscope, so as to obtain a desired information value.

Preferably, in the step (4), the corresponding information value can be read by scanning tunneling microscope imaging.

The invention has the beneficial effects that: the single tetraphenylporphyrin molecule adopted by the invention has 16 bits, and the storage density is very high; once the information is stored in the storage mode, the information cannot be erased, so that the information safety is extremely high; the organic molecules as the storage medium obviously reduce the volume of the storage device and are more convenient to carry.

Drawings

FIG. 1 is a schematic diagram of tetraphenylporphyrin molecules aligned to the substrate and their stored information values plotted in accordance with the present invention.

FIG. 2 is a schematic diagram of 8 bonding sites of tetraphenylporphyrin molecules according to the present invention.

FIG. 3 is a scanning tunneling microscope image of 2 information storage states and their measurements according to the present invention.

Detailed Description

For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

As shown in fig. 1, fig. 2 and fig. 3, a method for storing high-density information by using tetraphenylporphyrin molecules includes the following steps:

(1) calibrating an Au (111) substrate by using a rectangular coordinate system;

(5) information reading is performed by a scanning tunnel microscope.

In the step (1), the Au (111) substrate is single-crystal gold with a crystal orientation [111 ].

In the step (2), the purity of the tetraphenylporphyrin molecule is 97%.

In the step (2), the

information value

0 or 1 represents a bit in the binary system, and the bit is the minimum unit for data storage.

In step (2), the probability of the tetraphenylporphyrin molecule forming a signal value of 0 or 1 is equivalent.

In the step (2), once the 0 or 1 signal value is formed, it cannot be erased.

In the step (3), the experimental environment is an ultrahigh vacuum environment, and the vacuum degree is maintained at 1 × 10¹⁰Above mbar.

In the step (3), the directional induction can be realized by applying a bias voltage to a specific position through the scanning tunneling microscope, so that a desired information value is obtained.

In the step (4), the corresponding information value can be read by scanning tunneling microscope imaging.

The foregoing is merely a preferred embodiment of the invention and all such equivalent alterations and permutations and derivations thereof are intended to be included within the scope of the invention.

Claims

1. A method for high-density information storage by using tetraphenylporphyrin molecules is characterized by comprising the following steps:

(1) calibrating an Au (111) substrate by using a rectangular coordinate system;

(4) information reading is performed by a scanning tunnel microscope.

2. The method of claim 1, wherein the tetraphenylporphyrin molecule is used for high density information storage, and wherein: in the step (1), the Au (111) substrate is single-crystal gold with a crystal orientation [111 ].

3. The method of claim 1, wherein the tetraphenylporphyrin molecule is used for high density information storage, and wherein: in the step (2), the purity of the tetraphenylporphyrin molecule is 97%.

4. The method of claim 1, wherein the tetraphenylporphyrin molecule is used for high density information storage, and wherein: in the step (2), the information value 0 or 1 represents a bit in a binary system, and the bit is the minimum unit of data storage.

5. The method of claim 1, wherein the tetraphenylporphyrin molecule is used for high density information storage, and wherein: in the step (2), the probability of the tetraphenylporphyrin molecule forming a 0 or 1 signal value is equivalent.

6. The method of claim 1, wherein the tetraphenylporphyrin molecule is used for high density information storage, and wherein: in the step (2), the 0 or 1 signal value cannot be erased once formed.

7. The method of claim 1, wherein the tetraphenylporphyrin molecule is used for high density information storage, and wherein: in the step (3), the experimental environment is an ultrahigh vacuum environment, and the vacuum degree is kept at 1 × 10¹⁰Above mbar.

8. The method of claim 1, wherein the tetraphenylporphyrin molecule is used for high density information storage, and wherein: in the step (3), the directional induction can be realized by applying a bias voltage at a specific position through the scanning tunneling microscope, so that a desired information value is obtained.

9. The method of claim 1, wherein the tetraphenylporphyrin molecule is used for high density information storage, and wherein: in the step (4), the corresponding information value can be read through scanning tunnel microscope imaging.