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Method for preparing nano indium oxide with controllable appearance by hydrothermal method

A nano-indium oxide and hydrothermal technology are applied in chemical instruments and methods, inorganic chemistry, gallium/indium/thallium compounds, etc., to achieve the effects of low cost, optimized production process, and simple equipment

Inactive Publication Date: 2010-10-13
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Researchers have invested a lot of effort in the synthesis of nanomaterials, however, finding simple synthetic methods for novel nanostructures with specific functions is still a great challenge for today's nanotechnology

Method used

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  • Method for preparing nano indium oxide with controllable appearance by hydrothermal method
  • Method for preparing nano indium oxide with controllable appearance by hydrothermal method
  • Method for preparing nano indium oxide with controllable appearance by hydrothermal method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Weigh InCl 3 ·4H 2 O 0.5865g, urea 0.2401g(InCl 3 ·4H 2 The molar ratio of O to urea is 1:2), dissolved in 56ml of deionized water, magnetically stirred for 1 hour to form a colorless and transparent solution, transferred to a hydrothermal kettle, and reacted at 130°C for 18 hours. After the hydrothermal kettle is cooled to room temperature, take out the hydrothermal product. The hydrothermal product was separated by centrifugation, washed with deionized water and anhydrous ethanol three times, and then dried in an oven at 60°C for 2 hours to prepare a white precursor powder. figure 1 Based on the X-ray diffraction pattern of the precursor prepared in this example, it can be known by comparing with the standard card that the precursor obtained is cubic phase indium hydroxide (JCPDS No. 76-1463). figure 2 In the field emission scanning electron micrograph of the precursor indium hydroxide obtained in this example, it can be observed that the morphology of indium hydroxide...

Embodiment 2

[0041] Weigh InCl 3 ·4H 2 O 0.5823g, urea 0.6006g (InCl 3 ·4H 2 The molar ratio of O to urea is 1:5), dissolved in 60ml of deionized water, magnetically stirred for 1 hour to form a colorless and transparent solution, transferred to a hydrothermal kettle, and reacted at 140°C for 12 hours. After the hydrothermal kettle is cooled to room temperature, take out the hydrothermal product. The hydrothermal product was separated by centrifugation, washed with deionized water and anhydrous ethanol successively three times, and then dried in an oven at 60°C for 3 hours to prepare a white precursor powder. The dried precursor indium hydroxide is calcined at 500° C. for 2 hours to prepare light yellow indium oxide powder. Figure 5 This is the X-ray diffraction pattern of the indium oxide powder obtained in this example. It can be seen from the comparison with the standard card that the prepared indium oxide is also cubic phase (JCPDS No. 06-0416). Image 6 The field emission scanning elec...

Embodiment 3

[0043] Weigh InCl 3 ·4H 2 O 0.5834g, urea 0.9610g (InCl 3 ·4H 2 The molar ratio of O to urea is 1:8), dissolved in 58ml of deionized water, magnetically stirred for 1 hour to form a colorless and transparent solution, transferred to a hydrothermal kettle, and kept at 120°C for 18 hours to react. After the hydrothermal kettle is cooled to room temperature, take out the hydrothermal product. The hydrothermal product was separated by centrifugation, washed with deionized water and anhydrous ethanol for 3 times, and then dried in an oven at 60°C for 4 hours to prepare a white precursor powder. Figure 7 Is the field emission scanning electron microscope photo of the precursor indium hydroxide prepared in this example, and figure 2 , 6 In comparison, it is not difficult to find that the square-shaped indium hydroxide disappears and is replaced by flower-like clusters or single microrods composed of micro / nanorods with diameters between 300nm and 2μm. The dried precursor indium hydro...

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Abstract

The invention relates to a method for preparing nano indium oxide with controllable appearance by a hydrothermal method. The method comprises the following steps of: (1) weighing soluble indium salt and urea in a molar ratio of 1:2-1:15, and adding de-ionized water into the mixture to prepare uniform colorless transparent solution with magnetic stirring; then transferring the solution to the inner lining of a reaction kettle; preserving the heat at the temperature of between 120 and 140 DEG C to perform reaction for 12 to 24 hours; cooling the reaction product to room temperature; and performing centrifugal separation, and washing and drying the product to prepare a white precursor In(OH)3; and (2) calcining the dried indium hydroxide for 2 to 3 hours in air atmosphere at the temperature of between 450 and 550 DEG C to prepare slightly yellow indium oxide powder. The preparation method has the advantages of simple process, low production cost and capability of preparing the indium hydroxide nanostructures with various appearances by only adjusting and controlling the ratio of the raw materials without any template, surfactant or structure directing agent, and provides a convenient method for synthesizing the nano indium oxide with controllable appearance.

Description

Technical field [0001] The invention belongs to the field of preparation of nano indium oxide, and particularly relates to a method for preparing nano indium oxide with a controllable morphology by a hydrothermal method. Background technique [0002] In recent years, nanoscience and nanotechnology have developed by leaps and bounds. Researchers have invested a lot of energy in the synthesis of nanomaterials, but finding a simple synthesis method for new nanostructures with specific functions is still a huge challenge for today's nanotechnology. [0003] Indium oxide is a special wide-bandgap semiconductor (its direct band gap is 3.6eV, and the indirect band gap is 2.6eV). It has a small resistivity and high catalytic activity. It has been used in solar cells and flat panel displays. , Optical devices, optoelectronic devices, and gas sensors have been widely used in fields. As the demand for its applications increases, it is necessary to control the morphology and size of its indi...

Claims

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Application Information

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IPC IPC(8): C01G15/00
Inventor 王宏志陈振华何中媛李耀刚张青红
Owner DONGHUA UNIV
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