Method for preparing sulfur-doped molybdenum dioxide nanosheets with adjustable shapes and band gaps

A molybdenum dioxide and nanosheet technology, applied in chemical instruments and methods, molybdenum oxide/molybdenum hydroxide, inorganic chemistry, etc., can solve the problems of cumbersome process, unadjustable band gap, low yield, etc., and achieve photoluminescence. Good, cheap and non-toxic materials, good electrical conductivity

Inactive Publication Date: 2018-07-31
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of low yield, cumbersome process, and non-adjustable band gap in the preparation of molybdenum dioxide nanosheets, and to study the preparation method, so that ultra-thin molybdenum dioxide with different shapes and band gaps can be obtained on a large scale Nanosheets, and molybdenum dioxide can be applied to the field of micro-nano electronic device manufacturing

Method used

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  • Method for preparing sulfur-doped molybdenum dioxide nanosheets with adjustable shapes and band gaps
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  • Method for preparing sulfur-doped molybdenum dioxide nanosheets with adjustable shapes and band gaps

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Experimental program
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Embodiment 1

[0029] Prepare molybdenum dioxide nanosheets according to the method provided by the present invention: molybdenum trioxide powder 5mg, sulfur powder 100mg, high temperature zone growth temperature (700°C, 750°C and 800°C), heating rate 50°C / min; low temperature zone growth temperature 150°C ℃, heating rate 10℃ / min; argon 100sccm, holding time 10min, cooling down to room temperature and taking out the sample. Get product MoO 2 -1, MoO 2 -2 and MoO 2 -3 for subsequent analysis and characterization.

[0030] Concrete preparation steps are as follows:

[0031] (1) substrate treatment, the SiO 2 / Si substrate substrates were ultrasonicated for 10 min under deionized water, acetone and isopropanol to remove impurities and organic matter on the surface; 2 SO 4 :H 2 o 2 = Soak in 3:1 piranha lotion for 90 minutes; then use deionized water to sonicate for 15 minutes, and finally blow dry with an argon gun;

[0032] (2) Drug weighing and equipment debugging, weigh 5 mg of moly...

Embodiment 2

[0035] Molybdenum dioxide nanosheets are prepared according to the method provided by the invention: the growth temperature in the high temperature zone is 700°C, and the heating rate is 50°C / min; the growth temperature in the low temperature zone is 150°C, and the heating rate is 10°C / min; molybdenum trioxide powder (5mg, 10mg, 15mg),; sulfur powder 100mg, argon 100sccm, holding time 10min; after holding time 10min, cool down to room temperature and take out the sample. Get product MoO 2 -4, MoO 2 -5 and MoO 2 -6 for subsequent analysis and characterization.

[0036] (1) substrate treatment, the SiO 2 / Si substrate substrates were ultrasonicated for 10 min under deionized water, acetone and isopropanol to remove impurities and organic matter on the surface; 2 SO 4 :H 2 o 2 =3:1) soaked in 90min; then ultrasonically 15min with deionized water, and finally dried with an argon gun;

[0037] (2) Drug weighing and equipment debugging, use a high-precision electronic balanc...

Embodiment 3

[0040] Through Examples 1 and 2, we prepared molybdenum dioxide nanosheets in three shapes: triangle, pentagon and rhombus under both conditions, and we measured their angles respectively. Such as image 3 As shown, a is MoO 2 -4 samples, b is MoO 2 -5 samples, c is MoO 2 -6 samples, the apex angles of triangles, pentagons and rhombuses are all 80°, and the adjacent angles on both sides of the apex angles of pentagons and rhombuses are all 100°, and there is also a 100° angle at the small angle of the triangle. Not obvious, where 80° and 100° are the angles of standard molybdenum dioxide monoclinic crystals, so we preliminarily judge that the main components of the three nanosheets are molybdenum dioxide, but the reaction process and growth rate are inconsistent, resulting in the formation of three shapes .

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Abstract

The invention relates to a method for preparing sulfur-doped molybdenum dioxide nanosheets with adjustable shapes and band gaps. The method has the advantages that a method for adjusting band gaps through carrying out sulfur doping on molybdenum dioxide nanosheets is researched to obtain the nanosheets with different band gaps, then, the nanosheets can be applied to the manufacturing of micro / nanoelectronic devices, and electronic devices with excellent performance are obtained. The method has the advantages that the disadvantage that band gaps of molybdenum dioxide are oversized is overcome,and band gaps of the prepared molybdenum dioxide nanosheets are adjusted; and in order to achieve the aim, a molybdenum dioxide nanosheet band gap adjusting method is disclosed, and the sulfur dopeddegree of the nanosheets is adjusted through controlling a ratio of precursor sulfur powder to molybdenum trioxide powder and a growth temperature. Finally, the molybdenum dioxide nanosheets of different band gaps are obtained. The method disclosed by the invention is simple in processing steps and easy in reaction condition control and is adaptable to industrial production; and the product has excellent electrical properties and has a huge application value in the field of the micro / nano electronic devices.

Description

technical field [0001] The invention relates to a preparation method for adjusting the shape and band gap of molybdenum dioxide nanosheets by sulfur doping, and belongs to the technical field of preparation of new materials. Background technique [0002] Molybdenum dioxide is a wide-bandgap semiconductor with excellent optical, electrical, catalytic, and electrochromic properties. These properties make molybdenum dioxide widely used in catalysts, flat panel displays, sensors, electrochromic devices, and lithium batteries. It has great application value. [0003] Wide bandgap semiconductor materials have the characteristics of wide bandgap, high critical breakdown electric field, high thermal conductivity, and high carrier saturation drift velocity, and have great application potential in high temperature, high frequency, high power, optoelectronics, and radiation resistance. In addition, the preparation methods of molybdenum dioxide nanomaterials are diverse and the cost is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02C01G39/00
CPCC01G39/02C01G39/00C01P2002/80C01P2002/82C01P2002/84C01P2004/03C01P2004/04C01P2004/64
Inventor 刘技文冯龙
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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