6 results about "Molecular electronics" patented technology

The invention discloses a monomolecular structure design and generation method based on a large language model, and relates to the crossing field of monomolecular electronics and artificial intelligence. In order to solve the problems of low single molecule design efficiency and insufficient data, SingMolT5 is obtained through field fine tuning on the basis of MolT5, and generation from a natural language to a molecular SMILES is realized. According to the method, data are collected from literatures in the single molecule field and an existing disclosed molecule library, a fine tuning data set containing 329 high-quality instructions is constructed, and the fine tuning data set comprises three basic data types including a molecular skeleton, an anchoring group and molecules. The model is initialized by a MolT5 check point, and a cross entropy loss function is used in the fine tuning process; reasoning, generating and using a beam search strategy; the follow-up evaluation indexes comprise BLEU, Levenshtein, MACCS, RDK, Morga and effectiveness. The method provides an innovative technical path for'low experience and data dependent type single molecule design 'in the field of single molecule electronics, and is particularly suitable for aided design of a single molecule device core function unit and a single molecule sensing probe molecule, namely, a target molecular structure can be quickly converted through a natural language, the design threshold of researchers is reduced, and the design efficiency is improved. And a traceable technical basis can be provided for screening and iteration of a monomolecular structure based on a high-quality data set and rigorous evaluation logic.

The invention belongs to the technical field of molecular electronics, and particularly relates to a method for constructing a fixed-area molecular tunnel junction and an electrical property testing method.The method comprises the steps that a circular array mask is prepared, a gold target is deposited on the surface of a glass sheet, and a circular gold array is obtained; the gold-glass transparent array electrode is soaked in a molecular solution, when molecule self-assembly is completed, the surface is washed and dried, and the gold-glass transparent array electrode with the surface containing a self-assembly monomolecular film is obtained; preparing a gallium-indium alloy electrode; the gold-glass transparent array electrode is placed on an objective table, the tip of the gallium-indium alloy electrode is in contact with the circular gold array, the other end of the gallium-indium alloy electrode is led out to be in contact with the metal probe electrode, a current test loop is formed, and a fixed-area molecular tunnel junction is formed; compared with a traditional metal electrode, the gold-glass transparent array electrode has the advantage that adverse factors such as personal errors of molecular junction electrical property test results are effectively reduced.

The application discloses a reversible single-molecule switch based on local cation regulation and belongs to the technical field of molecular electronics. The application is based on the crack junction technology of an electrochemical scanning tunneling microscope. The distribution of local cations in an interface double electric layer is changed by controlling an electric potential, so that the state of a carboxylic acid molecule is influenced. The contact action of the carboxylic acid molecule and a gold needle tip is adjusted, and a single-molecule switch is realized. The electric potential is-0.5-0V. The application proves the influence of local cations in an electrochemical interface on carboxyl molecules, and opens up a new way for realizing the practical application of a reversible single-molecule switch through a gate electrode.

The invention belongs to the field of material chemistry and molecular electronics, and discloses a preparation method of a gold nanorod assembly. Comprising the following steps: providing a dispersion system containing a plurality of gold nanorods in a liquid-phase medium; introducing a heterocyclic ring assembly molecule anchored on the surface of the gold nanorod into the dispersion system, wherein the heterocyclic ring assembly molecule comprises an aromatic heterocyclic ring providing structural rigidity, a sulfur-containing anchoring group forming a coordinate bond with the gold surface, and a group or atom capable of forming a hydrogen bond; the gold nanorod assembly comprises at least two gold nanorods and heterocyclic ring assembly molecules located on the gold nanorods respectively, and the two gold nanorods are connected with each other through hydrogen bond supramolecular interaction formed between complementary functional groups of the heterocyclic ring assembly molecules. The preparation of the gold nanorod assembly with high yield and linear orientation is realized by utilizing the heterocyclic ring assembly molecules.

In various embodiments, synthetic bridge molecules are disclosed, usable in molecular electronics sensors. In various aspects, bridge molecules comprise fused ring polycyclic aromatic hydrocarbon structures in the shape of a long and narrow ribbon, with end groups on opposite short ends for selective binding to metal electrodes, one or more substituents near the midpoint of a long edge for binding to a probe molecule, and one or more additional substituent groups for solubility or other effects. In various embodiments, the bridge molecules herein are conducting, and provide a closed circuit in a sensor when forming a bridge between gapped electrodes.

The application belongs to the field of material chemistry and molecular electronics, and discloses a preparation method of gold nanorod assembly. The method comprises the following steps: providing a dispersion system containing a plurality of gold nanorods in a liquid medium; introducing a heterocyclic assembly molecule anchored on the surface of the gold nanorod into the dispersion system, wherein the heterocyclic assembly molecule contains a structural rigid aromatic heterocycle, a sulfur-containing anchoring group forming a coordination bond with the gold surface, and a group or atom capable of forming a hydrogen bond; the gold nanorod assembly contains at least two gold nanorods and the heterocyclic assembly molecule on each gold nanorod, and the two gold nanorods are connected by the hydrogen bond supramolecular interaction between the complementary functional groups of the heterocyclic assembly molecules. The preparation of the gold nanorod assembly with high yield and linear orientation is realized by using the heterocyclic assembly molecule.