CN101182028A - Method for preparing ZnO nano rod - Google Patents
Method for preparing ZnO nano rod Download PDFInfo
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- CN101182028A CN101182028A CNA2007100191742A CN200710019174A CN101182028A CN 101182028 A CN101182028 A CN 101182028A CN A2007100191742 A CNA2007100191742 A CN A2007100191742A CN 200710019174 A CN200710019174 A CN 200710019174A CN 101182028 A CN101182028 A CN 101182028A
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Abstract
The invention relates to a preparation method of ZnO nanorods. Analytically pure zinc nitrate hexahydrate is first added into distilled water to obtain transparent solution of zinc nitrate; the transparent solution is then added with sodium hydroxide or urea to prepare precursor solution which is next poured into a hydrothermal reaction kettle; the kettle is then sealed and placed in a warm-pressing and double control microwave hydrothermal reaction instrument and is cooled to the room temperature after the completion of the reaction; the hydrothermal reaction kettle is then opened and the product is filtered, collected and then is dried to obtain final products of the ZnO nanorods by being respectively washed with deionized water, absolute ethyl alcohol or isopropyl alcohol for a plurality times. The invention needs no post processing by adopting the microwave-hydrothermal method and has simple technological equipment. The obtained nanorods have narrow diameter distribution with the diameter of about 20nm-50nm and the length within the scope of dozens of nanometers to hundreds of nanometers with short reaction period and good repeatability. The method not only greatly reduces the preparation cost and but also has simple operation, short reaction period and good repeatability.
Description
Technical field
The present invention relates to the preparation method of a kind of ZnO, be specifically related to a kind of preparation method of ZnO nanometer rod.
Background technology
Zinc oxide (ZnO) has wide forbidden band (3.37eV) and big exciton binding energy (60eV), is a kind of material of uniqueness of the various character that have semi-conductor and piezoelectric property simultaneously and cause thus.Because it is luminous that it can be used as shortwave, transparent conductor, the most promising candidate material that piezoelectric and room temperature Ultra-Violet Laser are used and caused worldwide research interest.Up to now, under special growth conditions, successfully synthesized the nano wire of ZnO, nanometer rod, nano-comb, nano belt, nano-rings, nanometer spiral/nanometer spring, nanometer ball, nanometer flower and nanocages etc.These unique nanostructures illustrate indisputablely that in all material ZnO may be the material that has abundant structures and character in the nanostructure family.
Up to the present, the ZnO nanometer rod is synthesized by several special methods, as physical vaporous deposition [Yao B D, Chan Y F and Wang N.Formation of ZnOnanostructures by a simple way of thermal evaporation[J] .Appl.Phys.Lett.2002,81:757.], chemical Vapor deposition process [Jih-Jen Wu andSai-Chang Liu.Catalyst-free growth and characterization of ZnOnanorods[J] .J.Phys.Chem.B, 2002,106:9546-9551; Park W I, KimD H, Jung S W and Yi G C.Metalorganic vapor-phase epitaxial growthof vertically well-aligned ZnO nanorods[J] .Appl.Phys.Lett.2002,80:4232.], liquid phase method [Youngjo Tak and Kijung Yong.Controlled growthof well-aligned ZnO nanorod array using a novel solution method[J] .J.Phys.Chem.B 2005,109:19263-19269.], flame spraying high-temperature decomposition [Murray J.Height, Lutz Ma ¨ dler, and Sotiris E.Pratsinis.nanorods of ZnO made by flame spray pyrolysis[J] .Chem.Mater.2006,18:572-578.], hydrothermal method [Liu B and Zeng H C.Hydrothermal synthesisof ZnO nanorods in the diamet er regime of 50nm[J] .J.Am.Chem.Soc.2003,125:4430.] or the like.These methods or to the equipment requirements height, equipment and instrument are relatively more expensive; Very little to utilization ratio of raw materials; Perhaps complex process, preparation cycle is long, and is repeatable poor.
Summary of the invention
The object of the present invention is to provide a kind of being reflected in the liquid phase once to finish, do not need post-processed, and processing unit is simple, gained nanometer rod diameter Distribution is narrow, length controlled, and reaction time is short, the preparation method of the ZnO nanometer rod of good reproducibility,
For achieving the above object, the technical solution used in the present invention is: 1) at first analytically pure zinc nitrate hexahydrate is added in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 0.2mol/L-2.0mol/L;
2) add analytically pure sodium hydroxide or urea in the zinc nitrate clear solution, making the molar concentration rate in the solution is Zn
2+/ OH
-=1: 2 or Zn
2+/ urea=1: 2, and constantly stir, precursor solution formed;
3) precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, compactedness is controlled at 60-80%; Seal hydrothermal reaction kettle then, put it in the two control of the temperature and pressure microwave hydrothermal reaction; Select the reaction of temperature controlling mode or pressure control pattern, the temperature controlling mode hydrothermal temperature is controlled at 100-180 ℃, reaction 10-60min, and pressure control pattern hydro-thermal pressure-controlling is reacted 10-60min at 0.5MPa-4.0MPa, and reaction naturally cools to room temperature after finishing;
4) open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, dehydrated alcohol or washed with isopropyl alcohol for several times then respectively, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
The present invention adopts microwave-hydrothermal method preparation technology, do not need post-processed, and processing unit is simple, the about 20nm-50nm of gained nanometer rod diameter Distribution narrow diameter, the ZnO nanometer rod of length in tens nanometer arrives the hundreds of nanometer range, reaction time is short, and good reproducibility has prepared.This method not only greatly reduces preparation cost, and simple to operate, reaction time is short, good reproducibility.
Description of drawings
Fig. 1 is X-ray diffraction (XRD) collection of illustrative plates of the ZnO nanometer rod of the present invention's preparation, and wherein X-coordinate is diffraction angle (2 θ), unit for degree (°), ordinate zou is a diffracted intensity, unit is cps;
Fig. 2 is field emission scanning electron microscope (FESEM) photo of the ZnO nanometer rod of the present invention's preparation;
Fig. 3 is transmission electron microscope (TEM) photo of the ZnO nanometer rod of the present invention's preparation, and the upper right corner is selected area electron diffraction (SAED) style.
Embodiment
Embodiment 1, at first with analytically pure zinc nitrate hexahydrate (Zn (NO
3)
36H
2O) add in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 0.6mol/L; Add analytically pure sodium hydroxide (NaOH) in the zinc nitrate clear solution, making the molar concentration rate in the solution is Zn
2+/ OH
-=1: 2, and constantly stir, precursor solution formed; The precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, and compactedness is controlled at 70%; Seal hydrothermal reaction kettle then, put it in the two control of the MDS-6 type temperature and pressure microwave hydrothermal reaction; Select temperature controlling mode to react, hydrothermal temperature is controlled at 160 ℃, and the reaction times is controlled at 20min, and reaction naturally cools to room temperature after finishing; Open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, absolute ethanol washing then respectively for several times, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
Referring to Fig. 1, the ZnO nanometer rod of gained with Japanese D/max2000PCX-x ray diffractometer x analytic sample of science, is found that product is the hexagonal system zincite phase ZnO that JCPDS is numbered 36-1451; Referring to Fig. 2, this sample is observed with field emission JSM-6700F type scanning electronic microscope and JEM-3010 type transmission electron microscope (Fig. 3) that Japanese JEOL company produces, narrow from the diameter Distribution of the prepared as can be seen typical ZnO nanometer rod of photo, be about 30nm; Length distribution a wider range is for tens nanometer arrives the hundreds of nanometer.
Embodiment 2, at first with analytically pure zinc nitrate hexahydrate (Zn (NO
3)
36H
2O) add in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 0.8mol/L; In the zinc nitrate clear solution, add analytically pure urea (CO (NH
2)
2), making the molar concentration rate in the solution is Zn
2+/ urea=1: 2, and constantly stir, precursor solution formed; The precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, and compactedness is controlled at 60%; Seal hydrothermal reaction kettle then, put it in the two control of the MDS-6 type temperature and pressure microwave hydrothermal reaction; Select temperature controlling mode to react, hydrothermal temperature is controlled at 180 ℃, and the reaction times is controlled at 10min, and reaction naturally cools to room temperature after finishing; Open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, anhydrous isopropyl alcohol washing then respectively for several times, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
Embodiment 3, at first with analytically pure zinc nitrate hexahydrate (Zn (NO
3)
36H
2O) add in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 1.0mol/L; Add analytically pure sodium hydroxide (NaOH) in the zinc nitrate clear solution, making the molar concentration rate in the solution is Zn
2+/ OH
-=1: 2, and constantly stir, precursor solution formed; The precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, and compactedness is controlled at 80%; Seal hydrothermal reaction kettle then, put it in the two control of the MDS-6 type temperature and pressure microwave hydrothermal reaction; Select temperature controlling mode to react, hydrothermal temperature is controlled at 100 ℃, and the reaction times is controlled at 60min, and reaction naturally cools to room temperature after finishing; Open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, absolute ethanol washing then respectively for several times, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
Embodiment 4, at first with analytically pure zinc nitrate hexahydrate (Zn (NO
3)
36H
2O) add in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 1.5mol/L; In the zinc nitrate clear solution, add analytically pure urea (CO (NH
2)
2), making the molar concentration rate in the solution is Zn
2+/ urea=1: 2, and constantly stir, precursor solution formed; The precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, and compactedness is controlled at 63%; Seal hydrothermal reaction kettle then, put it in the two control of the MDS-6 type temperature and pressure microwave hydrothermal reaction; Select temperature controlling mode to react, hydrothermal temperature is controlled at 130 ℃, and the reaction times is controlled at 40min, and reaction naturally cools to room temperature after finishing; Open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, anhydrous isopropyl alcohol washing then respectively for several times, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
Embodiment 5, at first with analytically pure zinc nitrate hexahydrate (Zn (NO
3)
36H
2O) add in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 0.2mol/L; Add analytically pure sodium hydroxide (NaOH) in the zinc nitrate clear solution, making the molar concentration rate in the solution is Zn
2+/ OH
-=1: 2, and constantly stir, precursor solution formed; The precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, and compactedness is controlled at 70,60,80,63,75,68,72%; Seal hydrothermal reaction kettle then, put it in the two control of the MDS-6 type temperature and pressure microwave hydrothermal reaction; Select pressure control pattern hydro-thermal pressure-controlling at 0.5MPa, reaction 60min, reaction naturally cools to room temperature after finishing; Open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, absolute ethanol washing then respectively for several times, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
Embodiment 6, at first with analytically pure zinc nitrate hexahydrate (Zn (NO
3)
36H
2O) add in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 1.8mol/L; In the zinc nitrate clear solution, add analytically pure urea (CO (NH
2)
2), making the molar concentration rate in the solution is Zn
2+/ urea=1: 2, and constantly stir, precursor solution formed; The precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, and compactedness is controlled at 68%; Seal hydrothermal reaction kettle then, put it in the two control of the MDS-6 type temperature and pressure microwave hydrothermal reaction; Select pressure control pattern hydro-thermal pressure-controlling at 2.0MPa, reaction 30min, reaction naturally cools to room temperature after finishing; Open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, anhydrous isopropyl alcohol washing then respectively for several times, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
Embodiment 7, at first with analytically pure zinc nitrate hexahydrate (Zn (NO
3)
36H
2O) add in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 2.0mol/L; Add analytically pure sodium hydroxide (NaOH) in the zinc nitrate clear solution, making the molar concentration rate in the solution is Zn
2+/ urea=1: 2, and constantly stir, precursor solution formed; The precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, and compactedness is controlled at 72%; Seal hydrothermal reaction kettle then, put it in the two control of the MDS-6 type temperature and pressure microwave hydrothermal reaction; Select pressure control pattern hydro-thermal pressure-controlling at 4.0MPa, reaction 10min, reaction naturally cools to room temperature after finishing; Open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, absolute ethanol washing then respectively for several times, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
Claims (1)
1. the preparation method of a ZnO nanometer rod is characterized in that:
1) at first analytically pure zinc nitrate hexahydrate is added in the distilled water, stir, be mixed with Zn
2+Concentration is the zinc nitrate clear solution of 0.2mol/L-2.0mol/L;
2) add analytically pure sodium hydroxide or urea in the zinc nitrate clear solution, making the molar concentration rate in the solution is Zn
2+/ OH
-=1: 2 or Zn
2+/ urea=1: 2, and constantly stir, precursor solution formed;
3) precursor solution of above-mentioned preparation is poured in the hydrothermal reaction kettle, compactedness is controlled at 60-80%; Seal hydrothermal reaction kettle then, put it in the two control of the temperature and pressure microwave hydrothermal reaction; Select the reaction of temperature controlling mode or pressure control pattern, the temperature controlling mode hydrothermal temperature is controlled at 100-180 ℃, reaction 10-60min, and pressure control pattern hydro-thermal pressure-controlling is reacted 10-60min at 0.5MPa-4.0MPa, and reaction naturally cools to room temperature after finishing;
4) open hydrothermal reaction kettle, product is collected by filtering, and adopts deionized water, dehydrated alcohol or washed with isopropyl alcohol for several times then respectively, is drying to obtain final product ZnO nanometer rod in electric drying oven with forced convection under 80 ℃.
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| CNB2007100191742A CN100569654C (en) | 2007-11-23 | 2007-11-23 | A kind of preparation method of ZnO nanometer rod |
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| CN101182028A true CN101182028A (en) | 2008-05-21 |
| CN100569654C CN100569654C (en) | 2009-12-16 |
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| CN101824613A (en) * | 2010-04-19 | 2010-09-08 | 西安交通大学 | Method for growing zinc oxide nanowire array on zinc aluminum oxide conductive film |
| CN102157632A (en) * | 2011-01-12 | 2011-08-17 | 山东大学 | Method for improving luminous efficiency of LED (light-emitting diode) by utilizing ZnO nano-cone array |
| CN102219254A (en) * | 2011-06-20 | 2011-10-19 | 厦门大学 | Preparation method of zinc oxide nanorod |
| CN102531032A (en) * | 2010-12-24 | 2012-07-04 | 中国科学院兰州化学物理研究所 | Nanoscale flower-like zinc oxide preparation method |
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| CN102531032A (en) * | 2010-12-24 | 2012-07-04 | 中国科学院兰州化学物理研究所 | Nanoscale flower-like zinc oxide preparation method |
| CN102157632A (en) * | 2011-01-12 | 2011-08-17 | 山东大学 | Method for improving luminous efficiency of LED (light-emitting diode) by utilizing ZnO nano-cone array |
| CN102157632B (en) * | 2011-01-12 | 2012-07-04 | 山东大学 | Method for improving luminous efficiency of LED (light-emitting diode) by utilizing ZnO nano-cone array |
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| CN103408061A (en) * | 2013-07-25 | 2013-11-27 | 南京航空航天大学 | Preparation method for zinc oxide nanocrystalline |
| CN103496733A (en) * | 2013-09-30 | 2014-01-08 | 陕西科技大学 | Method for preparing carbon doped zinc oxide |
| CN104192890A (en) * | 2014-08-13 | 2014-12-10 | 燕山大学 | Method for preparing carbon-dope zinc oxide nanopillars |
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