CN102817093A - Method for preparing europium-doped yttrium trifluoride red luminescent hollow nano-fiber - Google Patents
Method for preparing europium-doped yttrium trifluoride red luminescent hollow nano-fiber Download PDFInfo
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- CN102817093A CN102817093A CN2012102832592A CN201210283259A CN102817093A CN 102817093 A CN102817093 A CN 102817093A CN 2012102832592 A CN2012102832592 A CN 2012102832592A CN 201210283259 A CN201210283259 A CN 201210283259A CN 102817093 A CN102817093 A CN 102817093A
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Abstract
The invention relates to a method for preparing europium-doped yttrium trifluoride red luminescent hollow nano-fiber, and belongs to the technical field of nano-grade material preparation. The method comprises four steps that: (1) a spinning liquid is prepared; (2) PVP/[PVP+Y(NO3)3+Eu(NO3)3] composite coaxial fiber is prepared with a coaxial electro-spinning technology; (3) Y2O3:5% Eu<3+> hollow nano-fiber is prepared by carrying out a heat treatment upon the composite coaxial fiber; and (4) Y2O3:5% Eu<3+> red luminescent hollow nano-fiber is prepared, wherein a double-crucible method is adopted, and the Y2O3:5% Eu<3+> hollow nano-fiber is subjected to a fluorination treatment by using ammonium bifluoride, such that the Y2O3:5% Eu<3+> red luminescent hollow nano-fiber is prepared. The nano-fiber has good crystallinity, a diameter of 210.9nm (plus or minus 29.1nm), and a length greater than 30mum. The method provided by the invention is simple and feasible, and can be used in batch productions. Therefore, the method has good application prospect.
Description
Technical field
The present invention relates to the nano material preparation research field, relate to a kind of preparation specifically and mix the method that europium three is fluoridized the luminous hollow nano fiber of red yttrium.
Background technology
Nanofiber is meant the filamentary material that on the three dimensions yardstick of material, has bidimensional to be in nanoscale, and radial dimension is a nanometer scale usually, and length is then bigger.Because the radial dimension of nanofiber is little of nanometer scale; Demonstrate series of characteristics; The most outstanding is that specific area is big; Thereby its surface energy increases with active, and then produces small-size effect, surface or interfacial effect, quantum size effect, macro quanta tunnel effect etc., and therefore shows the specificity of a series of chemistry, physics (heat, light, sound, electricity, magnetic etc.) aspect.Hollow nano fiber will have widely and use owing to have bigger specific area.In the prior art, a lot of methods that prepare nanofiber are arranged, the method for for example reeling off raw silk from cocoons, template synthetic method, split-phase method and self-assembly method etc.In addition, also has arc evaporation, laser high temperature inustion, compound pyrolysismethod.These three kinds of methods in fact all are after at high temperature making compound (or simple substance) evaporation, make nanofiber or nanotube through pyrolysis (or directly condensation), from essence, all belong to the compound steam sedimentation.
The rare earth fluoride phonon energy is low, has good heat endurance and environmental stability, extensively is used as luminescent material matrix, solid electrolyte, lubricant, iron and steel and non-ferrous alloy additive, electrode material, chemical sensor and biology sensor etc.Mixing europium three yttrium fluoride YF3:Eu3+ nano materials is a kind of important red fluorescence materials, has broad application prospects, and has become one of focus of nano luminescent material research field.People have adopted methods such as the precipitation method, microemulsion method, hydro-thermal and solvent-thermal method, sol-gel process, microwave method, supercritical ultrasonics technology, presoma pyrolysismethod, method of electrostatic spinning, have prepared the nano material of YF3:Eu3+ nano particle, nano wire, nanotube, nanometer rods, nanofiber, nanometer film, multiple patterns such as polyhedron is nanocrystalline, composite construction is nanocrystalline, nuclear shell structure nano material.Mixing europium three yttrium fluoride YF3:Eu3+ hollow nano fibers is a kind of novel red luminescent materials; To obtain important application in fields such as luminous and demonstration, false proof, medical science detection, biomarker, solar cell, chemistry and biology sensor, nano-devices, have broad application prospects.At present, do not see the report of mixing europium three yttrium fluoride YF3:Eu3+ emitting red light hollow nano fibers.
The patent No. is the technical scheme that 1975504 United States Patent (USP) discloses a relevant electrospinning process (electrospinning); This method is a kind of effective ways that prepare continuous, as to have macro length micro nanometer fiber, is at first proposed in 1934 by Formhals.This method mainly is used for preparing high polymer nanometer fiber; It is characterized in that making charged Polymer Solution or melt in electrostatic field, to receive the traction of electrostatic force and spray, invest the receiving screen on opposite, thereby realize wire drawing by nozzle; Then; Solvent evaporation at normal temperatures, perhaps melt is cooled to normal temperature and solidifies, and obtains micro nanometer fiber.Over nearly 10 years, occurred adopting electrospinning process to prepare the technical scheme of inorganic compound such as oxidate nano fiber at the inorfil preparing technical field, described oxide comprises TiO
2, ZrO
2, Y
2O
3, Y
2O
3: RE
3+(RE
3+=Eu
3+, Tb
3+, Er
3+, Yb
3+/ Er
3+), NiO, Co
3O
4, Mn
2O
3, Mn
3O
4, CuO, SiO
2, Al
2O
3, V
2O
5, ZnO, Nb
2O
5, MoO
3, CeO
2, LaMO
3(M=Fe, Cr, Mn, Co, Ni, Al), Y
3Al
5O
12, La
2Zr
2O
7Deng metal oxide and composite oxide of metal.The single spinning head of uses such as Wang Jinxian, employing electrostatic spinning technique have prepared rare earth fluoride/rare earth oxyfluoride composite nano fibre [Chinese invention patent, grant number: ZL200810050959.0]; Employing electrostatic spinning techniques such as Dong Xiangting have prepared mixes europium Y
7O
6F
9Nanofiber [Chinese invention patent, grant number: ZL201010550196.3]; The single spinning head of uses such as Wang Jinxian, employing electrostatic spinning technique have prepared rare earth trifluoride nanofiber [Chinese invention patent, grant number: ZL201010107993.4]; Wang Ce etc. use single spinning head, adopt electrostatic spinning technique to pass through R (CF
3CO
2)
3/ PVP (R=Eu, Ho) heat-treat, and synthesized ROF (R=Eu, Ho) nanofiber [J.Nanosci.Nanotechnol., 2009,9 (2): 1522-1525] by composite nano fiber.Electrospinning process can prepare big L/D ratio micrometer fibers or nanofiber continuously.Electrostatic spinning technique is improved, adopt coaxial spinning head, spinning solution is injected into respectively in the interior pipe and outer tube of device for spinning; When adding High Level DC Voltage, the spinning solution in the inner and outer pipes is pulled out by electric field force simultaneously, solidifies the back and forms coaxial nano cable; If with this coaxial nano cable high-temperature heat treatment in air; Remove high polymer templates, also can prepare the nano-cable or the hollow nano fiber that are made up of inorganic oxide, this technology promptly is a coaxial electrostatic spinning technology.This technology of usefulness such as Wang Ce has prepared silica polymer co-axial nano fiber [SCI, 2005,26 (5): 985-987]; Utilizations such as Dong Xiangting should technology prepare TiO
2@SiO
2Sub-micron coaxial cable [chemical journal, 2007,65 (23): 2675-2679], ZnO@SiO
2Coaxial nano cable [Chinese Journal of Inorganic Chemistry, 2010,26 (1), 29-34], Al
2O
3/ SiO
2Coaxial ultra micro cable [silicate journal, 2009,37 (10), 1712-1717]; Han, et al adopts should technology prepare PU (Core)/PC (Shell) composite nano fiber [Polymer composites, 2006,10:381-386]; Utilizations such as Dong Xiangting should technology prepare TiO
2Hollow nano fiber [silicate journal, 2007,35 (10), 1302-1305].At present, do not see that adopting coaxial electrostatic spinning technology to combine with fluorination technology prepares YF
3: Eu
3+The report of emitting red light hollow nano fiber.
When utilizing electrostatic spinning technique to prepare nano material, the composition of the kind of raw material, the molecular weight of high polymer templates, spinning solution, spinning process parameter and Technology for Heating Processing all have material impact to the pattern and the size of final products.The present invention adopts coaxial electrostatic spinning technology earlier, with yittrium oxide Y
2O
3With europium oxide Eu
2O
3Be raw material,, obtain yttrium nitrate Y (NO with evaporating behind the nitric acid dissolve
3)
3With europium nitrate Eu (NO
3)
3Mixed crystal adds solvent N, and dinethylformamide DMF and high polymer templates polyvinylpyrrolidone PVP obtain shell layer spinning solution, and PVP is dissolved in ethanol CH
3CH
2Among the OH, obtain the sandwich layer spinning solution, the viscosity of control shell and sandwich layer spinning solution is most important, under the experiment condition of the best, carries out electrostatic spinning, prepares PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber, sandwich layer is PVP, shell is [PVP+Y (NO
3)
3+ Eu (NO
3)
3], it is heat-treated in air, obtain Y
2O
3: Eu
3+Hollow nano fiber adopts double crucible method, with ammonium acid fluoride NH
4HF
2Fluoridize for fluorization agent, prepared the YF of the pure phase of novel structure
3: Eu
3+The emitting red light hollow nano fiber.
Summary of the invention
Various in background technology prepare in the method for nanofiber, the shortcoming of the method for reeling off raw silk from cocoons be solution viscosity is required too harsh; The shortcoming of template synthetic method is to prepare the continuous fibers that the root root separates; Split-phase method and self-assembly method production efficiency are all lower; And the compound steam sedimentation is because to the demand of high temperature, so process conditions are difficult to control, and the nanofiber major diameter of above-mentioned several method preparation is than little.Adopt single spinning head in the background technology, used electrostatic spinning technique to prepare metal oxide, composite oxide of metal nanofiber, rare earth fluoride/rare earth oxyfluoride composite nano fibre, mixed europium Y
7O
6F
9Nanofiber, rare earth trifluoride nanofiber and ROF (R=Eu, Ho) nanofiber; Adopt coaxial spinning head, use coaxial electrostatic spinning technology to prepare nano-cable and TiO
2Hollow nano fiber.Prior art adopts methods such as the precipitation method, microemulsion method, hydro-thermal and solvent-thermal method, sol-gel process, microwave method, supercritical ultrasonics technology, presoma pyrolysismethod, method of electrostatic spinning, has prepared YF
3: Eu
3+The nano material of nano particle, nano wire, nanotube, nanometer rods, nanofiber, nanometer film, multiple patterns such as polyhedron is nanocrystalline, composite construction is nanocrystalline, nuclear shell structure nano material.For a kind of novel red luminous hollow nano fiber material is provided in the nanofiber field, we combine coaxial electrostatic spinning technology with fluorination technology, invented YF
3: Eu
3+The preparation method of emitting red light hollow nano fiber.
The present invention is achieved in that and at first prepares shell with certain viscosity and the sandwich layer spinning solution that is used for coaxial electrostatic spinning, uses coaxial electrostatic spinning technology and carries out electrostatic spinning, under the experiment condition of the best, prepares PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber, it is heat-treated in air, obtain Y
2O
3: Eu
3+Hollow nano fiber adopts double crucible method, with ammonium acid fluoride NH
4HF
2Fluoridize for fluorization agent, prepared the YF of the pure phase of novel structure
3: Eu
3+The emitting red light hollow nano fiber.In the present invention, the mole percent of the europium ion of doping is 5%, is labeled as YF
3: 5%Eu
3+, i.e. that the present invention is prepared is YF
3: 5%Eu
3+The emitting red light hollow nano fiber.The steps include:
(1) preparing spinning solution
That use in yttrium source and europium source is yittrium oxide Y
2O
3With europium oxide Eu
2O
3, high polymer templates adopts polyvinylpyrrolidone PVP, and molecular weight is 1300000 and 90,000 two kinds, adopts N, dinethylformamide DMF and ethanol CH
3CH
2OH is a solvent, takes by weighing a certain amount of yittrium oxide Y
2O
3With europium oxide Eu
2O
3, Y wherein
3+And Eu
3+Mol ratio be 95: 5, promptly the mole percent of europium ion is 5%, uses nitric acid HNO
3The evaporation of dissolving back obtains Y (NO
3)
3And Eu (NO
3)
3Mixed crystal adds N, and dinethylformamide DMF solvent and molecular weight are 1300000 polyvinylpyrrolidone PVP; Stir 4h in the room temperature lower magnetic force, and leave standstill 2h, form shell layer spinning solution; The mass percent of each part is in this shell layer spinning solution: nitrate content 9%, PVP content 9%, solvent DMF content 82%; With molecular weight is that 90000 PVP is dissolved in the ethanol, stirs 4h in the room temperature lower magnetic force, and leaves standstill 2h; Form the sandwich layer spinning solution, the mass percent of each part is in this sandwich layer spinning solution: PVP content 9%, etoh solvent content 91%;
(2) preparation PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber
The employing coaxial electrostatic spinning technology, nozzle needle was for cutting the 10# stainless steel syringe needle after putting down in the formation of coaxial spinning head adopted, and external diameter is 1.0mm, and internal diameter is 0.7mm; Outer nozzle needle is for cutting the 12# stainless steel syringe needle after putting down, and external diameter is 1.4mm, and internal diameter is 1.2mm; The good back of two nozzle needles cover is fixing, the shell layer spinning solution for preparing is placed the outer tube of coaxial device for spinning, add the sandwich layer spinning solution in the interior pipe; Successfully flow out to guarantee outer liquid in the gap of regulating inside and outside spinning head, adopts perpendicular spray mode, and syringe needle is vertical with horizontal plane; The adjusting DC voltage is 13kV, and spinning head is 16cm to the curing distance of receiving screen wire netting, 18～28 ℃ of indoor temperatures; Relative humidity is 40%～70%, along with the volatilization of solvent, on the receiving screen wire netting, can obtain PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber;
(3) preparation Y
2O
3: 5%Eu
3+Hollow nano fiber
With described PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber is put in the temperature programmed control stove and heat-treats, heating rate is 1 ℃/min, at 700 ℃ of constant temperature 8h, the speed with 1 ℃/min is cooled to 200 ℃ again, naturally cools to room temperature with body of heater afterwards, obtains Y
2O
3: 5%Eu
3+Hollow nano fiber;
(4) preparation YE
3: 5%Eu
3+The emitting red light hollow nano fiber
Fluorination reagent uses ammonium acid fluoride NH
4HF
2, adopt double crucible method, ammonium acid fluoride is put into monkey, cover carbon-point above, with described Y
2O
3: 5%Eu
3+Hollow nano fiber is placed on above the carbon-point, and monkey is put into bigger crucible, between interior outer crucible, adds an amount of ammonium acid fluoride; Add that on outer crucible the crucible lid puts into tube furnace; Heating rate with 2 ℃/min is warming up to 280 ℃ of insulation 2h, is warmed up to 450 ℃ of insulation 3h again, and the rate of temperature fall with 1 ℃/min is cooled to 200 ℃ at last; Naturally cool to room temperature with body of heater afterwards, obtain YF
3: 5%Eu
3+Emitting red light hollow nano fiber, diameter are 210.9 ± 29.1nm, and length is greater than 30 μ m.
At the YF described in the said process
3: 5%Eu
3+The emitting red light hollow nano fiber has good crystallinity, and diameter is 210.9 ± 29.1nm, and length has realized goal of the invention greater than 30 μ m.
Description of drawings
Fig. 1 is YF
3: 5%Eu
3+The XRD spectra of emitting red light hollow nano fiber;
Fig. 2 is YF
3: 5%Eu
3+The SEM photo of emitting red light hollow nano fiber, this figure double as Figure of abstract;
Fig. 3 is YF
3: 5%Eu
3+The diameter Distribution histogram of emitting red light hollow nano fiber;
Fig. 4 is YF
3: 5%Eu
3+The EDS spectrogram of emitting red light hollow nano fiber;
Fig. 5 is YF
3: 5%Eu
3+The exciting light spectrogram of emitting red light hollow nano fiber;
Fig. 6 is YF
3: 5%Eu
3+The emission spectrum figure of emitting red light hollow nano fiber.
The specific embodiment
The yittrium oxide Y that the present invention selected for use
2O
3With europium oxide Eu
2O
3Purity be 99.99%, polyvinylpyrrolidone PVP, molecular weight are 1300000 and 90000, N, dinethylformamide DMF, ethanol CH
3CH
2OH, carbon-point, ammonium acid fluoride NH
4HF
2With nitric acid HNO
3Be commercially available analysis net product; Used glass apparatus, crucible and equipment are instrument and equipments commonly used in the laboratory.
Embodiment: take by weighing a certain amount of yittrium oxide Y
2O
3With europium oxide Eu
2O
3, Y wherein
3+And Eu
3+Mol ratio be 95: 5, promptly the mole percent of europium ion is 5%, uses nitric acid HNO
3The evaporation of dissolving back obtains Y (NO
3)
3And Eu (NO
3)
3Mixed crystal adds N, and dinethylformamide DMF solvent and molecular weight are 1300000 polyvinylpyrrolidone PVP; Stir 4h in the room temperature lower magnetic force, and leave standstill 2h, form shell layer spinning solution; The mass percent of each part is in this shell layer spinning solution: nitrate content 9%, PVP content 9%, solvent DMF content 82%; With molecular weight is that 90000 PVP is dissolved in the ethanol, stirs 4h in the room temperature lower magnetic force, and leaves standstill 2h; Form the sandwich layer spinning solution, the mass percent of each part is in this sandwich layer spinning solution: PVP content 9%, etoh solvent content 91%; The employing coaxial electrostatic spinning technology, nozzle needle was for cutting the 10# stainless steel syringe needle after putting down in the formation of coaxial spinning head adopted, and external diameter is 1.0mm, and internal diameter is 0.7mm; Outer nozzle needle is for cutting the 12# stainless steel syringe needle after putting down, and external diameter is 1.4mm, and internal diameter is 1.2mm; The good back of two nozzle needles cover is fixing, the shell layer spinning solution for preparing is placed the outer tube of coaxial device for spinning, add the sandwich layer spinning solution in the interior pipe; Successfully flow out to guarantee outer liquid in the gap of regulating inside and outside spinning head, adopts perpendicular spray mode, and syringe needle is vertical with horizontal plane; The adjusting DC voltage is 13kV, and spinning head is 16cm to the curing distance of receiving screen wire netting, 18～28 ℃ of indoor temperatures; Relative humidity is 40%～70%, along with the volatilization of solvent, on the receiving screen wire netting, can obtain PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber; With described PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber is put in the temperature programmed control stove and heat-treats, heating rate is 1 ℃/min, at 700 ℃ of constant temperature 8h, the speed with 1 ℃/min is cooled to 200 ℃ again, naturally cools to room temperature with body of heater afterwards, obtains Y
2O
3: 5%Eu
3+Hollow nano fiber; Fluorination reagent uses ammonium acid fluoride NH
4HF
2, adopt double crucible method, ammonium acid fluoride is put into monkey, cover carbon-point above, with described Y
2O
3: 5%Eu
3+Hollow nano fiber is placed on above the carbon-point, and monkey is put into bigger crucible, between interior outer crucible, adds an amount of ammonium acid fluoride; Add that on outer crucible the crucible lid puts into tube furnace; Heating rate with 2 ℃/min is warming up to 280 ℃ of insulation 2h, is warmed up to 450 ℃ of insulation 3h again, and the rate of temperature fall with 1 ℃/min is cooled to 200 ℃ at last; Naturally cool to room temperature with body of heater afterwards, obtain YF
3: 5%Eu
3+The emitting red light hollow nano fiber.Described YF
3: 5%Eu
3+The emitting red light hollow nano fiber has good crystallinity, the d value of its diffraction maximum and relative intensity and YF
3The listed d value of PDF standard card (70-1935) consistent with relative intensity, belong to rhombic system, space group is Pnma, sees shown in Figure 1.Described YF
3: 5%Eu
3+The diameter of emitting red light hollow nano fiber is even, is hollow fiber-shaped, and length is seen shown in Figure 2 greater than 30 μ m.With the Shapiro-Wilk method to YF
3: 5%Eu
3+The diameter of emitting red light hollow nano fiber carries out normal distribution-test, under 95% confidence level, and YF
3: 5%Eu
3+The diameter Distribution of emitting red light hollow nano fiber belongs to normal distribution, and diameter is 210.9 ± 29.1nm, sees shown in Figure 3.YF
3: 5%Eu
3+The emitting red light hollow nano fiber is made up of Y, F and Eu element, the Au conductive layer of surface plating when Au derives from the SEM sample preparation, and C derives from organic carbonization, does not have to see shown in Figure 4 due to the completing combustion volatilization.When the monitoring wavelength is 593nm, YF
3: 5%Eu
3+The strongest excitation peak of hollow nano fiber is positioned at the 394nm place, corresponding to Eu
3+ 7F
0→
5L
6Transition is seen shown in Figure 5.Under the ultraviolet excitation of 394nm, YF
3: 5%Eu
3+Hollow nano fiber is launched the bright red that main peak is positioned at 593nm, corresponding to Eu
3+Ion
5D
0→
7F
1, as shown in Figure 6.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (2)
1. one kind prepares and mixes the method that europium three is fluoridized the luminous hollow nano fiber of red yttrium; It is characterized in that the method that adopts coaxial electrostatic spinning technology to combine with fluorination technology uses polyvinylpyrrolidone PVP to be high polymer templates; Adopt N, dinethylformamide DMF and ethanol CH
3CH
2OH is a solvent, and fluorination reagent uses ammonium acid fluoride NH
4HF
2, the preparation product is europium ion-doped three yttrium fluoride YF
3: 5%Eu
3+The emitting red light hollow nano fiber the steps include:
(1) preparing spinning solution
That use in yttrium source and europium source is yittrium oxide Y
2O
3With europium oxide Eu
2O
3, high polymer templates adopts polyvinylpyrrolidone PVP, adopts N, dinethylformamide DMF and ethanol CH
3CH
2OH is a solvent, takes by weighing a certain amount of yittrium oxide Y
2O
3With europium oxide Eu
2O
3, Y wherein
3+And Eu
3+Mol ratio be 95: 5, promptly the mole percent of europium ion is 5%, uses nitric acid HNO
3The evaporation of dissolving back obtains Y (NO
3)
3And Eu (NO
3)
3Mixed crystal adds N, dinethylformamide DMF solvent and polyvinylpyrrolidone PVP; Stir 4h in the room temperature lower magnetic force, and leave standstill 2h, form shell layer spinning solution; The mass percent of each part is in this shell layer spinning solution: nitrate content 9%, PVP content 9%, solvent DMF content 82%; PVP is dissolved in the ethanol, stirs 4h in the room temperature lower magnetic force, and leave standstill 2h; Form the sandwich layer spinning solution, the mass percent of each part is in this sandwich layer spinning solution: PVP content 9%, etoh solvent content 91%;
(2) preparation PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber
The employing coaxial electrostatic spinning technology, nozzle needle was for cutting the 10# stainless steel syringe needle after putting down in the formation of coaxial spinning head adopted, and external diameter is 1.0mm, and internal diameter is 0.7mm; Outer nozzle needle is for cutting the 12# stainless steel syringe needle after putting down, and external diameter is 1.4mm, and internal diameter is 1.2mm; The good back of two nozzle needles cover is fixing, the shell layer spinning solution for preparing is placed the outer tube of coaxial device for spinning, add the sandwich layer spinning solution in the interior pipe; Successfully flow out to guarantee outer liquid in the gap of regulating inside and outside spinning head, adopts perpendicular spray mode, and syringe needle is vertical with horizontal plane; The adjusting DC voltage is 13kV, and spinning head is 16cm to the curing distance of receiving screen wire netting, 18～28 ℃ of indoor temperatures; Relative humidity is 40%～70%, along with the volatilization of solvent, on the receiving screen wire netting, can obtain PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber;
(3) preparation Y
2O
3: 5%Eu
3+Hollow nano fiber
With described PVP/ [PVP+Y (NO
3)
3+ Eu (NO
3)
3] compound coaxial fiber is put in the temperature programmed control stove and heat-treats, heating rate is 1 ℃/min, at 700 ℃ of constant temperature 8h, the speed with 1 ℃/min is cooled to 200 ℃ again, naturally cools to room temperature with body of heater afterwards, obtains Y
2O
3: 5%Eu
3+Hollow nano fiber;
(4) preparation YF
3: 5%Eu
3+The emitting red light hollow nano fiber
Fluorination reagent uses ammonium acid fluoride NH
4HF
2, adopt double crucible method, ammonium acid fluoride is put into monkey, cover carbon-point above, with described Y
2O
3: 5%Eu
3+Hollow nano fiber is placed on above the carbon-point, and monkey is put into bigger crucible, between interior outer crucible, adds an amount of ammonium acid fluoride; Add that on outer crucible the crucible lid puts into tube furnace; Heating rate with 2 ℃/min is warming up to 280 ℃ of insulation 2h, is warmed up to 450 ℃ of insulation 3h again, and the rate of temperature fall with 1 ℃/min is cooled to 200 ℃ at last; Naturally cool to room temperature with body of heater afterwards, obtain YF
3: 5%Eu
3+Emitting red light hollow nano fiber, diameter are 210.9 ± 29.1nm, and length is greater than 30 μ m.
2. the method that europium three is fluoridized the luminous hollow nano fiber of red yttrium is mixed in a kind of preparation according to claim 1; It is characterized in that; High polymer templates is the polyvinylpyrrolidone PVP of molecular weight Mr=1300000 in the shell layer spinning solution, and high polymer templates is the polyvinylpyrrolidone PVP of molecular weight Mr=90000 in the sandwich layer spinning solution.
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| CN108977936A (en) * | 2018-06-08 | 2018-12-11 | 长春理工大学 | Coated with silica mixes the preparation method of europium gadolinium fluoride pipe sleeve linear nano fiber |
| CN109930243A (en) * | 2017-12-15 | 2019-06-25 | Tcl集团股份有限公司 | Nanofiber and preparation method thereof |
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| CN109930243A (en) * | 2017-12-15 | 2019-06-25 | Tcl集团股份有限公司 | Nanofiber and preparation method thereof |
| CN109930243B (en) * | 2017-12-15 | 2021-11-26 | Tcl科技集团股份有限公司 | Nanofiber and preparation method thereof |
| CN108977936A (en) * | 2018-06-08 | 2018-12-11 | 长春理工大学 | Coated with silica mixes the preparation method of europium gadolinium fluoride pipe sleeve linear nano fiber |
| CN108977936B (en) * | 2018-06-08 | 2020-10-13 | 长春理工大学 | Preparation method of silica-coated europium-doped gadolinium fluoride pipe sleeved linear nanofiber |
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