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Method for preparing two-dimensional boron hydride nanosheet

A technology of boron hydride and nanosheets, applied in chemical instruments and methods, inorganic chemistry, boron compounds, etc.

Pending Publication Date: 2020-01-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no experimental report on the preparation of boron hydride nanoparticles without the presence of a substrate

Method used

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  • Method for preparing two-dimensional boron hydride nanosheet
  • Method for preparing two-dimensional boron hydride nanosheet
  • Method for preparing two-dimensional boron hydride nanosheet

Examples

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Embodiment 1

[0028] The preparation of two-dimensional boron hydride nanosheets by directly thermally decomposing a solid boron source through a substrate-free method includes the following preparation steps:

[0029] (1) 0.5g boron source NaBH 4 The powder is placed in the temperature zone on the left side of the quartz tube;

[0030] (2) Seal the tube furnace system, turn on the vacuum pump to pump the air pressure of the quartz tube to the limit vacuum state of 0.1Pa, and keep it for 20min;

[0031] (3) The hydrogen flow meter is set to 10 sccm, and hydrogen is injected into the quartz tube vacuum cavity;

[0032] (4) Adjust the exhaust valve to keep the air pressure inside the cavity at 50Pa;

[0033] (5) Raise the temperature in the left temperature zone to 490°C in 49 minutes, and anneal the boron source for 2 hours;

[0034] (6) Heat up the left temperature zone again, set it to 550°C for 15 minutes, and let it react for 300 minutes;

[0035] (7) Use fan cooling to quickly drop ...

Embodiment 2

[0041] The preparation of two-dimensional boron hydride nanosheets by substrate-free direct thermal decomposition method includes the following preparation steps:

[0042] (1) 0.5g boron source NaBH 4 The powder is placed in the temperature zone on the left side of the quartz tube;

[0043] (2) Seal the tube furnace system, turn on the vacuum pump to evacuate the air pressure of the quartz tube to the ultimate vacuum state of 0.1 Pa, and keep it for 20 minutes;

[0044] (3) The hydrogen flow meter is set to 10 sccm, and hydrogen is injected into the quartz tube vacuum cavity;

[0045] (4) Adjust the exhaust valve to keep the air pressure inside the cavity at 50Pa;

[0046] (5) Raise the temperature in the left temperature zone to 490°C in 49 minutes, and anneal the boron source for 2 hours;

[0047] (6) Raise the temperature of the left temperature zone again, set it to 550°C for 15 minutes, and let it react for 30 minutes;

[0048] (7) Continue to increase the temperature...

Embodiment 3

[0055] The preparation of two-dimensional boron hydride nanosheets by substrate-free direct thermal decomposition method includes the following preparation steps:

[0056] The basic method is similar to Example 2, except that the reaction time in step 7 is 60min, and the difference between step 11 and Example 2 is that the solution to be processed has been changed to hydrochloric acid and sodium hydroxide, and an insoluble solution is obtained after drying. Ultrastable two-dimensional boron hydride nanosheets in acid and alkali solutions, whose X-ray photoelectron spectroscopy is shown in Figure 6 As shown, it can be clearly seen that the characteristic peak of B1s appears at 187.5eV.

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Abstract

The invention discloses a method for preparing a two-dimensional boron hydride nanosheet, and the method comprises the following steps of: placing a boron source in a vacuum reaction furnace, and obtaining the high-yield and super-stable two-dimensional boron hydride nanosheet in a quartz boat in a reducing atmosphere through a strict two-step or three-step sectional heating procedure under the condition of no metal substrate. According to the method, a step-by-step heating mode is adopted, under the condition that no metal substrate or other epitaxial substrates exist, the boron hydride nanosheet is obtained in the mode that the solid boron source is controllably decomposed through a two-step or three-step segmented heating method, and therefore the method for preparing the high-yield andsuper-stable two-dimensional boron hydride nanosheet is provided. The two-dimensional boron hydride nanosheet obtained by the method can be applied to multiple technical fields, including solar cells, energy storage and conversion devices, transistor devices, sensors and memristors.

Description

technical field [0001] The invention belongs to the field of two-dimensional film preparation, in particular to a method for preparing two-dimensional boron hydride nanosheets. Background technique [0002] Since its discovery in 2004, graphene has attracted much attention due to its large specific surface area, excellent mechanical properties, ultra-high light transmittance, and high intrinsic mobility. However, the intrinsic graphene material is a semimetal with zero bandgap, which severely limits its application in switching and logic devices. At present, binary or multi-component two-dimensional materials are generally prepared by chemical vapor deposition, but the stoichiometric ratio is difficult to control, and the process of etching the substrate seriously affects the performance of the device. Unlike the materials that have been widely concerned before, the preparation of single-element two-dimensional boron materials on metal substrates has received extensive atte...

Claims

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Application Information

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IPC IPC(8): C01B35/00
CPCC01B35/00C01P2004/03C01P2004/01C01P2004/04C01P2002/82C01P2002/72C01P2002/85C01P2004/20
Inventor 台国安侯闯
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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