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Single-crystal indium micron sheet and synthetic method and application thereof

A synthesis method and technology of micro-sheets, applied in the field of preparation and application of micro-nano materials, can solve problems such as difficulty in obtaining large-area single-crystal metal micro-sheets, and achieve high yield, strong adhesion, and simple synthesis process

Active Publication Date: 2021-11-05
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the synthesis of large-area single-crystal indium microsheets with large widths in organic solvents.
Generally speaking, in chemical solvents, it is easier to synthesize single-crystal microsheets of oxides and other covalent compounds with larger areas, because some covalent substances (ZnO and PbS 2 etc.) are relatively easy to crystallize to form large-area single crystals, but it is difficult to obtain large-area single-crystal metal microsheets in solvents

Method used

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  • Single-crystal indium micron sheet and synthetic method and application thereof
  • Single-crystal indium micron sheet and synthetic method and application thereof
  • Single-crystal indium micron sheet and synthetic method and application thereof

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preparation example Construction

[0031] A method for synthesizing single-crystal indium micro-sheets is as follows: using polyhydric alcohol as a solvent, citrate as a surfactant, and borohydride salt as a reducing agent, and adopting a wet chemical method to synthesize indium micro-sheets. The specific experimental steps are as follows. First, take an appropriate amount of polyol and pour it into a three-necked flask, and blow nitrogen into it. Next, pour the citrate and the indium salt into the three-necked flask, heat it to 70-150° C., and keep it warm for a while. Then weigh an appropriate amount of borohydride salt and make it into a solution with an appropriate amount of deionized water. The borohydride salt solution was quickly poured into the three-necked flask, and after a period of reaction, rapid cooling was performed. Finally, the cooled sample was centrifuged, washed with alcohol and centrifuged several times, and the centrifuged sample was dispersed in ethanol for storage.

[0032] First of a...

Embodiment 1

[0035] First, 80 mL of diethylene glycol was added to the three-necked flask, and nitrogen gas was introduced and stirred, and then 2×10 -3 mol indium chloride tetrahydrate and 1.52×10 -3 mol of disodium citrate was put into a three-necked flask, and then heated to 100°C in an oil bath while stirring, and then kept warm for 30min, then added with 4×10 -3mol of sodium borohydride in 1.6mL aqueous solution, the color of the solution rapidly changed from colorless to gray. After reacting for 5 minutes, move to room temperature water for rapid cooling. Indium microflakes with a thickness of 35-80 nm, a length of 5-50 μm and a width of 0.5-5 μm are finally obtained. Among them, after cooling in water for 1.5 minutes, the appearance of shiny substances in the solution can be observed with the naked eye. Finally, after cooling for 1 hour, it is centrifuged and washed with alcohol and then stored in ethanol. After being dispersed in ethanol and precipitated for 12 hours, it is found...

Embodiment 2

[0043] First, 80 mL of diethylene glycol was added to the three-necked flask, and nitrogen gas was introduced and stirred, and then 2×10 -3 mol indium chloride tetrahydrate and 1.52×10 -3 mol disodium citrate was put into a three-necked flask, then stirred and heated to 100°C, and then kept warm for 30min, adding 4×10 -3 mol of sodium borohydride in 1.6mL aqueous solution, reacted for 5min, then moved to 0°C ice-water mixture for rapid cooling. Indium microflakes with a thickness of 35-80 nm, a length of 5-50 μm and a width of 0.5-5 μm are finally obtained.

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Abstract

The invention provides a single-crystal indium micron sheet and a synthesis method and application thereof. The single-crystal indium micron sheet is synthesized by a chemical method in an organic solvent. The indium micron sheet synthesized by the invention is composed of single-crystal indium with a thickness of 35-80 nm, a length of 5-50 [mu]m and a width of 0.5-5 [mu]m or 5-50 [mu]m. The synthesis method comprises the following steps: mixing indium salt, citrate and polyhydric alcohol in an inert atmosphere, carrying out heating and dissolving while stirring, then adding a reducing agent borohydride salt at 70-150 DEG C or room temperature for a reduction reaction, and finally, carrying out rapid cooling or directly conducting standing at room temperature to obtain the single-crystal indium micron sheet. According to the invention, a preparation process is simple, one-step wet chemical synthesis is combined with subsequent rapid cooling or direct room-temperature reduction is carried out, experimental requirements are low, and the method is convenient to operate and friendly to environment.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of micro-nano materials, and in particular relates to a method for preparing single-crystal indium microsheets. Background technique [0002] Indium is a low-melting metal with good electrical and thermal conductivity, excellent photoelectric performance, and excellent flexibility. Its microsheets are widely used in the fields of micro-nano welding, conductive ink, microelectrode, thermal conductive ink, microfluidics and flexible micro-nano optoelectronic devices. There are important application prospects. [0003] Metal indium is not only flexible, but also has strong adhesion to most substrates, and is often used as a vacuum sealing material for high-end devices. Therefore, its microsheets can be used as vacuum-tight pellets for micro-nano devices. However, to date, there have been no reports in the literature of large-area single-crystal indium microsheets synthesized in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/02C30B7/14
CPCC30B29/02C30B7/14Y02P70/50
Inventor 胡锦莲高创
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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