A method for preparing and transferring ultrathin large size lead iodide nanosheets

A lead iodide, large-scale technology is applied in the field of preparation and transfer of ultra-thin and large-scale lead iodide nanosheets, which can solve the problems of difficulty in preparing nanosheets, complicated operation, poor repeatability, etc., and achieves good controllability, Reproducible, high-yield results

Active Publication Date: 2022-07-05
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the preparation method of two-dimensional lead iodide nanosheets still needs further improvement
At present, the methods for synthesizing lead iodide crystals with various nanosheet structures mainly include: mechanical exfoliation method, physical vapor deposition method and solution method. However, PbI prepared by mechanical exfoliation method 2 Difficult to exfoliate large, uniform thin layers of material with poor reproducibility and irregular shapes
The physical vapor deposition method can prepare a

Method used

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  • A method for preparing and transferring ultrathin large size lead iodide nanosheets
  • A method for preparing and transferring ultrathin large size lead iodide nanosheets
  • A method for preparing and transferring ultrathin large size lead iodide nanosheets

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Experimental program
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Effect test

Embodiment 1

[0031] 10mg PbI 2 The particles were mixed with 10 ml of ultrapure water, and stirred for 6 h on a heating table with a temperature of 90 °C and a rotation speed of 300 rmp to obtain PbI with a concentration of 1 mg / ml 2Supersaturated aqueous solution; then cut the silicon substrate into a size of 1cm*1cm, and clean it, and then use an evaporation apparatus to vapor-deposit metal Cr-30nm on the clean silicon substrate to obtain a Cr-coated substrate; the Cr-coated lining The bottom is placed in a plasma cleaner and fed with O 2 Carry out the hydrophilic treatment for 300s of cleaning, and then place the hydrophilic treated Cr-plated substrate on a hot stage at 40 °C for constant temperature maintenance, and then use a pipette to remove 5 ul of PbI. 2 The supersaturated water solution was dropped on the Cr coating substrate. After the solution was dried, the temperature was increased to 150 °C for 2 min, and PbI with a size of 60 μm and a thickness of 3 nm could be prepared. ...

Embodiment 2

[0033] 12mg PbI 2 The particles were mixed with 10 ml of ultrapure water, and stirred for 24 h on a heating table with a temperature of 90 °C and a rotation speed of 300 rpm to obtain PbI with a concentration of 1.2 mg / ml 2 Supersaturated aqueous solution; then cut the silicon substrate into a size of 5mm*5mm, and clean it, and then use an evaporation apparatus to evaporate metal Cr-5nm / Au-20nm on the clean silicon substrate to obtain a Cr / Au coating substrate ; The Cr / Au coating substrate is placed in a plasma cleaner and fed with N 2 The hydrophilic treatment was carried out for 400s of cleaning, and then the Cr / Au plated substrate that had been hydrophilic treated was placed on a hot stage at 40 °C for constant temperature maintenance, and then the volume of 2ul of PbI was transferred with a pipette gun. 2 The supersaturated aqueous solution was dropped on the Cr / Au coating substrate, and after the solution was dried, the temperature was increased to 180 °C for 2 minutes, ...

Embodiment 3

[0035] 15mg PbI 2 The particles were mixed with 10 ml of ultrapure water, and stirred for 6 h on a heating table with a temperature of 90 °C and a rotation speed of 350 rmp to obtain PbI with a concentration of 1.5 mg / ml 2 Supersaturated aqueous solution; then cut the silicon substrate into a size of 1.5cm*1.5cm and clean it; then use an evaporation apparatus to evaporate metal Cr-5nm / Au-50nm on the clean silicon substrate to obtain a Cr / Au coating lining The Cr / Au plated substrate was placed in a plasma cleaning apparatus and the air was passed through to perform a hydrophilic treatment for 300 s. Keep at constant temperature; then use a pipette to transfer a volume of 15ul of PbI 2 The supersaturated aqueous solution was dropped on the Cr / Au plated substrate, and the PbI on the surface of the solution on the Cr / Au plated substrate with tweezers 2 The nanosheets are drained onto the ultra-thin carbon film; after the solution is dried, heat treatment at 105 °C for 1 min to c...

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Abstract

The invention discloses a method for preparing and transferring ultra-thin and large-sized lead iodide nanosheets. The method comprises uniformly mixing pure lead iodide powder and ultrapure water according to a certain proportion, heating and stirring at a certain temperature, and then using The solution method is to drop a certain volume of solution on a substrate with a metal coating on the surface at a certain temperature to prepare ultra-thin lead iodide nanosheets; use the characteristics of growing lead iodide nanosheets on the liquid surface to drain or orient them Transfer to the target substrate or sample, non-destructive ultra-clean transfer of ultra-thin large-sized lead iodide nanosheets can be achieved. The invention can prepare and transfer ultra-thin and large-size lead iodide nanosheets with a size of 50-200um, a thickness of 3-20nm, a single crystal structure and high quality, and has important reference significance for growing more nanosheets based on solution method. Physical mechanisms such as molecular dynamics can be further studied, and the transfer method provided by the present invention has the advantages of non-destructive ultra-cleaning, good controllability, high repeatability, high yield, low cost, etc., and is beneficial to industrial production.

Description

technical field [0001] The invention relates to a method for preparing and transferring ultra-thin large-size lead iodide nanosheets. The method is simple in preparation, low in cost, good in repeatability and high in yield, and is helpful for further research on physical mechanisms such as molecular dynamics, and has Conducive to industrial production. Background technique [0002] In recent years, two-dimensional materials have attracted extensive attention in the materials field due to their unique quantum confinement size. Ultrathin two-dimensional nanomaterials are an emerging class of nanomaterials with sheet-like structures with horizontal dimensions exceeding 100 nm or several micrometers or even larger, but only a single or a few atoms thick (typically less than 5 nm thick). Since graphene (graphite with a thickness of one atomic layer) was prepared, its novel chemical and physical properties have attracted the research enthusiasm and interest of many scientists an...

Claims

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Application Information

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IPC IPC(8): C01G21/16B82Y30/00B82Y40/00
CPCC01G21/16B82Y30/00B82Y40/00Y02P70/50
Inventor 王琳仲净贤朱超周大伟
Owner NANJING UNIV OF TECH
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