Unlock instant, AI-driven research and patent intelligence for your innovation.

A Method for Heterogeneously Growing Nano Sno2 on the Surface of α-Fe2O3 Nanocrystals

A technology of nanocrystals and nanocrystals, applied in the field of chemical synthesis, can solve the problems of affecting the heterogeneous growth of the second phase, being different, and not forming a heterogeneous interface, etc., and achieving the effect of cheap raw materials, high yield, and strong applicability

Inactive Publication Date: 2015-09-16
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the morphology and exposed surface of the synthesized first-phase nanocrystals are different, and there is often a certain amount of surfactant remaining on the surface. These factors will affect whether the second phase can be successfully grown heterogeneously.
At present, the reported methods can only synthesize SnO with specific microstructure and morphology for specific morphology and exposed surface or specific surfactant. 2 / α-Fe 2 o 3 Nano-heterojunctions, some can even only synthesize simple two-phase composites (SnO 2 and Fe 2 o 3 There is no heterogeneous interface between the nanocrystals)
In addition, some of these synthesis methods require high-temperature heat treatment; others require the use of specific solvents or surfactants, and there is no simple, efficient and universal synthesis method yet.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Method for Heterogeneously Growing Nano Sno2 on the Surface of α-Fe2O3 Nanocrystals
  • A Method for Heterogeneously Growing Nano Sno2 on the Surface of α-Fe2O3 Nanocrystals
  • A Method for Heterogeneously Growing Nano Sno2 on the Surface of α-Fe2O3 Nanocrystals

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1: SnO 2 / α-Fe 2 o 3 Preparation and Morphological Characterization of (Quasi-cubic) Nano-Heterojunction Powders

[0014] The nano-quasi-cubic α-Fe selected in this example 2 o 3 Nanocrystalline powder morphology see figure 1 a, Surfactant polyvinylpyrrolidone remains on its surface. Weigh 0.087g SnCl 4 ·5H 2 O and 0.267g NaOH were dissolved in 15mL ethanol (SnCl 4 Mole ratio with NaOH is 1:6) to get Sn(OH) 6 2- solution; weigh 0.010g quasi-cubic α-Fe 2 o 3 Precursor nanocrystals, ultrasonically dispersed in prefabricated Sn(OH) 6 2- In solution, α-Fe 2 o 3 with Sn(OH) 6 2- The molar ratio was 1:1; the resulting suspension was transferred to a 25mL stainless steel reaction kettle, and the solvothermal reaction was carried out in a muffle furnace at 220°C for 2 hours; the product was collected by high-speed centrifugation; the product was deionized separately Wash with water and ethanol 3 times, and dry in a vacuum oven at 50°C for 4 hours to ob...

example 2

[0017] Example 2: SnO 2 / α-Fe 2 o 3 Preparation and Morphological Characterization of (Spindle) Nano Heterojunction Powder

[0018] The nano-spindle-shaped α-Fe selected in this example 2 o 3 Nanocrystalline powder morphology see figure 2 a, Surfactant phosphate remains on its surface. Weigh 0.870g SnCl 4 ·5H 2 O and 26.700g NaOH were dissolved in 150mL ethanol (SnCl 4 Mole ratio with NaOH is 1:60) to get Sn(OH) 6 2- solution; weigh 0.010g spindle-shaped α-Fe 2 o 3 Precursor nanocrystals, ultrasonically dispersed in prefabricated Sn(OH) 6 2- In solution (α-Fe 2 o 3 with Sn(OH) 6 2- The molar ratio is 1:8); the obtained suspension was transferred to a 25mL stainless steel reaction kettle, and the solvothermal reaction was carried out at 200°C in a muffle furnace for 2 hours; the product was collected by high-speed centrifugation; the product was deionized separately Wash with water and ethanol for 3 times, and dry in a vacuum oven at 50°C for 4 hours to obtai...

example 3

[0020] Example 3: SnO 2 / α-Fe 2 o 3 Preparation and Morphological Characterization of (Rhombohedral) Nano-Heterojunction Powders

[0021] The nano rhombohedral α-Fe selected in this example 2 o 3 Nanocrystalline powder morphology see image 3 a, Surfactant cetyltrimethylammonium bromide remains on its surface. Weigh 0.870g SnCl 4 ·5H 2 O and 26.700g NaOH were dissolved in 75mL ethanol (SnCl 4 Mole ratio with NaOH is 1:60); weigh 0.010g rhombohedral α-Fe 2 o 3 Nanocrystalline, ultrasonically dispersed in prefabricated Sn(OH) 6 2- In dilute solution (α-Fe 2 o 3 with Sn(OH) 6 2- The molar ratio is 1:20); the resulting suspension was transferred to a 25mL stainless steel reaction, and the solvothermal reaction was carried out in a muffle furnace at 240°C for 3 hours; the product was collected by high-speed centrifugation; the product was respectively washed with deionized water and ethanol for 3 times, and dried in a vacuum oven at 50°C for 4 hours to obtain SnO 2...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for heterogeneously growing nano SnO2 on the surface of alpha-Fe2O3 nanocrystallines. The alpha-Fe2O3 nanocrystallines obtained in advance are dispersed in Sn(OH)6<2-> ethanol solution, and nano SnO2 is heterogeneously grown on the alpha-Fe2O3 nanocrystallines by virtue of solvothermal reaction, so that a semiconductor heterogeneous junction is formed. The preparation method provided by the invention is simple and convenient in process and high in yield, adopts cheap raw materials, is applicable to alpha-Fe2O3 crystallines with various morphologies and exposed surfaces, reported in literatures at present, and is not affected by residual surfactant on the surfaces of the nanocrystallines.

Description

technical field [0001] The present invention relates to the field of chemical synthesis. Background technique [0002] α-Fe 2 o 3 and SnO 2 are two widely used semiconductor materials, among which α-Fe 2 o 3 The band gap is 2.2eV, which is a narrow band gap semiconductor material; while SnO 2 Its bandgap is as wide as 3.8eV, and it is a wide bandgap semiconductor material. The nanocrystals of these two materials have their own advantages in photocatalysis, gas sensing, solar cells and other application fields. In recent years, it has been reported in the literature that the heterogeneous composite of nanocrystals of these two materials to form SnO 2 / α-Fe 2 o 3 Nano-heterojunction, its photoelectric performance will be better than that of single-phase nanocrystal. For example, in 2008, an article reported the synthesis of SnO in the journal Nanotechnology (Nanotechnology, 19(2008) 205603) of the Royal Society of Physics. 2 / α-Fe 2 o 3 Nano-heterojunction, the he...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/02B82Y30/00B82Y40/00
Inventor 王元生牛牧童黄烽
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI