CN1701862A - Method for fluorescence synergy of tungstate nano thin film - Google Patents
Method for fluorescence synergy of tungstate nano thin film Download PDFInfo
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- CN1701862A CN1701862A CN 200510026933 CN200510026933A CN1701862A CN 1701862 A CN1701862 A CN 1701862A CN 200510026933 CN200510026933 CN 200510026933 CN 200510026933 A CN200510026933 A CN 200510026933A CN 1701862 A CN1701862 A CN 1701862A
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Abstract
This invention relates to fluorescence synergistic new method for tungstate nano-thin membrane. Use hydrolysis of TiCl4 liquid to prepare nano-TiO2 sensitization agent; prepare metal salt and tungsten source solution, add and mix cyclohexane and tween-80 by turns; and add amyl alcohol, mix to clear; mix both quick and homogenize at room temperature; after 12 hours, add acet to demulsify, and take centrifuge; clear precipitates with dehydrated alcohol, acet and distilled water by turns and store in dehydrated alcohol; move the supernatant fluid, add TiO2 sensitization agent and celloidin to mix for one hour to obtain the material; dip clear slide and control the lift speed for 35mm/min, take air drying; put into muffle furnace, keep heat preservation 200Deg for 30min and constant temperature of 500Deg for one hour, take anneal; then obtain mentioned product. The raw material is easy to have; cost is low; operation and device are simple; product has high purity; optical and electric performance are super; it is liable to realize industrialization and provides new way.
Description
Technical field
The present invention relates to a kind of new method of tungstate nano film fluorescence synergy.
Background technology
Tungstates powder and crystalline material thereof have broad application prospects in industries such as optics, electronics, biology, coating, medicine with its particular structure characteristic, photoelectricity and chemical property, thereby have caused people's attention, have started the extensive studies upsurge.Wherein, the most noticeable then is that they can be used as the scintillator luminescent material and extensively are used as detector and are applied to aspects such as factory, medicine and scientific research.The crystal mass of tungstates has influenced the luminous and scintillation properties of tungstates strongly, and people have carried out the research of a large amount of raising crystal mass, and in the hope of improving its flicker luminescent properties, the most generally the method for Cai Yonging is rare earth ion doped method.People adopt the method for doping with rare-earth ions in the tungstates lattice to improve its luminescent properties.Yet this method but exists lattice structure and is difficult to shortcomings such as accurate calculating, cost height.Along with the requirement of photoelectric device microminiaturization, thin-film material is applied at aspects such as solid-state laser, fiber optics, light-emitting flash body, accelerators with performances such as its excellent more light in powder body material, electricity, magnetic, catalysis.Nano thin-film more makes it cause people's extensive concern day by day in the research application of whole new material with its particular performances, and scientists is devoted to the preparation method of nano thin-film and the research of performance optimization.Yet the preparation of tungstates film and the research of performance improvement do not cause people's common concern as yet, the rarely seen especially report of the preparation of its nano thin-film and the research of performance optimization.Up to now, also do not see both at home and abroad the research report of flicker luminescent properties to the tungstates film and preparation method thereof.More do not see the method for the tungstate nano film of energy large-scale production fluorescence synergy.
Summary of the invention
The objective of the invention is to disclose a kind of new method of tungstate nano film fluorescence synergy, specifically is to adopt the way of doped semiconductor nanocrystal TiO 2 particles can significantly improve the fluorescence property of tungstate nano film.
In order to reach the goal, we discover, the nano thin-film of doped semiconductor nanocrystal particle is owing to can change the roughness, density, porosity etc. of film from microcosmic angle, and has the original characteristic of particle, make performances such as its light, electricity, magnetic be better than common nano film material more, and then demonstrate its unique glamour.The present invention is with semiconductor nano TiO
2Be the fluorescence sensitivity agent, prepared doped Ti O
2Tungstate nano film, this dopen Nano film has improved the fluorescence property of tungstate nano film greatly.Experiment showed, with semiconductor nano TiO
2Material is the fluorescence sensitivity agent, and the method for improving the tungstate nano film fluorescence property is truly feasible.The present invention prepares tungstates and TiO with reversed phase micelle system and sol-gel process respectively
2Nano particle prepares the predecessor of nano thin-film by the mass percent that changes two kinds of nano particles; Under the situation that has collodion to add, adopt to flood-technology of lifting prepares doped Ti O
2Tungstate nano film.Prepared doping tungstate nano film has excellent fluorescence more.In this reaction system, can regulate and control product size, pattern and crystal structure degree by control calcining heat, time.
Concrete technology is as follows:
The first step: at room temperature with the TiCl of 1.5mL
4Solution slowly is added drop-wise in the 15mL absolute ethyl alcohol, obtained the yellow solution of homogeneous transparent behind the sonic oscillation through 15 minutes, this solution left standstill in closed environment be carried out to gel, after the 353K heat treated, flaxen xerogel can be formed, fluorescence sensitivity agent of the present invention can be become through heat treatment as the xerogel of presoma.
Second step: take by weighing the soluble tungsten source of soluble metallic salt and the 0.020mol of 0.020mol, then it is dissolved in slaine and the tungsten source solution of making concentration 0.4mol/L in the 50mL distilled water respectively.
The 3rd step: 28mL cyclohexane, 3mL Tween-80 and second metal salt solution that goes on foot the 1mL 0.4mol/L that makes are added in the conical flask successively.Rotating speed with 3000rpm fully stirs, and adds the 1mL amylalcohol again, and stir about made slaine micellar solution to the clarification of reversed micelle solution in 15 minutes.Replace metal salt solution with the second step prepared tungsten source solution, adopt identical method to obtain tungsten source micellar solution.Then two kinds of prepared micellar solutions are mixed rapidly, and stirring mixed it in 5 minutes under room temperature.Behind the question response 12 hours, add the acetone breakdown of emulsion.Centrifugal with centrifuge with the rotating speed of 2000rpm, supernatant liquor glue head dropper sucking-off.
The 4th step: the precipitated product that centrifugation is obtained respectively is placed in the absolute ethyl alcohol for three times and preserves with absolute ethyl alcohol, acetone, distilled water cleaning successively.Remove the fluorescence sensitivity agent that adds first step gained behind the supernatant liquor again, after stirring 10 minutes with the rotating speed of 3000rpm under the room temperature, add the 2mL collodion and stir and it was mixed in 1 hour, gained is Coating Materials of the present invention.
The 5th step: with the slide of standard as film plating substrate.Before the use, adopt the ultrasonic processing of red fuming nitric acid (RFNA), acetone and ethanol 20 minutes respectively, clean with distilled water flushing again, dry standby.
The 6th step: adopt to flood-technology of lifting prepares nano thin-film.The 5th slide that clean up of step is immersed in the prepared Coating Materials of the 4th step, and control pull rate is 35mm/min, and placement 20 minutes under room temperature, makes it air-dry.Be placed on then in the Muffle furnace, in 200 ℃ the insulation 30 minutes after, be heated to 500 ℃ of constant temperature 1h (hour) after annealing.Reaction is closed Muffle furnace after finishing, and makes it slowly reduce to room temperature.Promptly obtain the significant tungstate nano film product of fluorescence synergy of the present invention.
Use X-ray powder diffraction (XRD) and SEM (SEM) that the structure and the pattern of product are characterized respectively, its optical property is characterized with infrared spectrometer, XRF.
The present invention has the following advantages:
1. because the present invention adopts the reversed micelle system to prepare the tungstate nano particle, therefore answer the oil-water ratio in the strict control course of reaction, to obtain the nanometer tungstates of uniform particle diameter, pattern rule.This method is simple and reaction condition is gentle.
2. adopt the nano-TiO of sol-gel process preparation
2Fluorescence sensitivity agent uniform particle diameter, productive rate height and method are simple, and its introducing can improve the fluorescence property of tungstate nano film greatly.
3. owing to the prepared predecessor viscosity of the present invention is poor, under normal temperature and pressure conditions, be difficult to obtain the nano thin-film of high compaction, but be the film forming agent in dispersant and the film forming procedure, can under normal temperature and pressure conditions, obtain the high nano thin-film of density with the collodion.
4. because the present invention in preparation process, can control the fluorescence property of product by the mass percent that changes two kinds of nano particles, have luminous easy control, method characteristic of simple.
5. preparation system of the present invention makes up easily, and easy and simple to handle, condition is easily controlled, and is with low cost, and the product processing is convenient succinct, is suitable for large-scale industrial production.Whole process of production does not have any pollution simultaneously, meets the sustainable development requirement.
Description of drawings
Fig. 1 is the shape appearance figure that the SEM (SEM) of the product of embodiments of the invention 1 obtains
Fig. 2 is the structure chart that the X-ray powder diffraction (XRD) of the product of embodiments of the invention 1 obtains
Fig. 3 is the infrared absorpting light spectra of the product of embodiments of the invention 1
Fig. 4 is the fluorescence emission spectrogram of the product of embodiments of the invention 1
The specific embodiment
Embodiment 1:
The first step: at room temperature with the TiCl of 1.5ml
4Solution slowly is added drop-wise in the 15ml absolute ethyl alcohol, obtained the yellow solution of homogeneous transparent behind the sonic oscillation through 15 minutes, this solution is left standstill in closed environment, be carried out to gel, after the 353K heat treated, flaxen xerogel can be formed, fluorescence sensitivity agent of the present invention, i.e. semiconductor nano TiO can be formed through heat treatment as the xerogel of presoma
2Particle.
Second step took by weighing 0.020mol lead acetate (analyzing pure), and the tungsten source is 0.020mol sodium tungstate (analyzing pure).Respectively it is dissolved in the solution that is made into two kinds of 0.4mol/L in the 50mL distilled water.
The 3rd step: the 1mL 0.4mol/L lead acetate solution that 28mL cyclohexane, 3mL Tween-80 and second step are made adds in the conical flask successively.Rotating speed with 3000rpm fully stirs, and adds the 1mL amylalcohol again, and stir about 15 minutes to reversed micelle solution clarification makes lead acetate micellar solution.Replace lead acetate solution with prepared sodium tungstate solution of second step, adopt identical method to obtain sodium tungstate micellar solution.Then two kinds of prepared micellar solutions are mixed rapidly, and stirring mixed it in 5 minutes under room temperature.Behind the question response 12 hours, add the acetone breakdown of emulsion.Centrifugal with centrifuge with the rotating speed of 2000rpm, supernatant liquor glue head dropper sucking-off.
The 4th step: the precipitated product that centrifugation is obtained is kept in the absolute ethyl alcohol after cleaning (respectively three times) with absolute ethyl alcohol, acetone, distilled water successively.Add 10% or 50% mass percent first step gained nano-TiO again after removing supernatant liquor
2The fluorescence sensitivity agent after stirring 10 minutes with the rotating speed of 3000rpm under the room temperature, adds the 2mL collodion and stirs and it was mixed in 1 hour, and gained is Coating Materials of the present invention.
The 5th step: with the slide of standard as film plating substrate.Before the use, adopt the ultrasonic processing of red fuming nitric acid (RFNA), acetone and ethanol 20 minutes respectively, clean with distilled water flushing again, dry standby.
The 6th step: adopt to flood-technology of lifting prepares nano thin-film.The slide that the 5th step was cleaned up immerses in the Coating Materials of the 4th step preparation, and the control pull rate is 35mm/min, and places 20 minutes under room temperature, makes it air-dry.Be placed on then in the Muffle furnace, after 30 minutes, be heated to 1 hour after annealing of 500 ℃ of constant temperature in 200 ℃ of insulations.Reaction is closed Muffle furnace after finishing, and makes it slowly reduce to room temperature.The SEM of product (SEM) observed result shows PbWO
4And TiO
2Nano particle is evenly distributed on the film of high compaction, PbWO
4Be shaped as peanut shape, be about 300nm, diameter is 180nm, TiO
2Particle diameter is about 30 nanometers (seeing accompanying drawing 1).As can be known, this nano thin-film is the stolzite of tetragonal crystal system from X-ray powder diffraction figure (seeing accompanying drawing 2), better crystallinity degree, purity height.Results of IR has been verified in wave number at 600cm
-1～1400cm
-1Between, PbWO
4The existence of nano particle on film, and TiO
2No infrared absorption peak (seeing accompanying drawing 3).Spectrofluorimetry is the result show, when adding TiO
2Amount be 10% o'clock, fluorescence intensity strengthens 11% with respect to the lead tungstate nano film; When adding TiO
2Amount be 50% o'clock, fluorescence intensity strengthens 53% (seeing accompanying drawing 4) with respect to the lead tungstate nano film.
Embodiment 2:
With BaCl
2Replace lead acetate, other conditions and step and embodiment 1 are identical, and the product that obtains is the doped Ti O of high compaction
2BaWO
4Nano thin-film.The SEM of product (SEM) observed result shows, prepared doping BaWO
4Nano thin-film is bar-shaped, is about 180nm, and diameter is 50nm, and its crystallographic system is identical with embodiment 1.Spectrofluorimetry is the result show, when adding TiO
2Amount be 20% o'clock, fluorescence intensity strengthens 21% with respect to the lead tungstate nano film; When adding TiO
2Amount be 50% o'clock, fluorescence intensity strengthens 69% with respect to the lead tungstate nano film.
Embodiment 3:
With CaCl
2Replace lead acetate, other conditions and step and embodiment 1 are identical, and the product that obtains is the high doped Ti O of density
2CaWO
4Nano thin-film.The CaWO of its pattern for being cross-linked to form by the particle about 100nm
4Nano thin-film.Its crystallographic system is identical with embodiment 1.Spectrofluorimetry is the result show, when adding TiO
2Amount be 10% o'clock, fluorescence intensity strengthens 15% with respect to the lead tungstate nano film; When adding TiO
2Amount be 50% o'clock, fluorescence intensity strengthens 47% with respect to the lead tungstate nano film.
Embodiment 4:
With SrCl
2Replace lead acetate, other conditions and step and embodiment 1 are identical, and the product that obtains is the high doped Ti O of density
2SrWO
4Nano thin-film.The doping SrWO of its pattern for being cross-linked to form by the irregular particle about 110nm
4Nano thin-film.Its crystallographic system is identical with embodiment 1.Spectrofluorimetry is the result show, when adding TiO
2Amount be 10% o'clock, fluorescence intensity strengthens 19% with respect to the lead tungstate nano film; When adding TiO
2Amount be 50% o'clock, fluorescence intensity strengthens 60% with respect to the lead tungstate nano film.
Claims (1)
1. tungstate nano film carries out the method for fluorescence synergy, it is characterized in that:
The first step: at room temperature with the TiCl of 1.5ml
4Solution slowly is added drop-wise in the 15ml absolute ethyl alcohol, obtained the yellow solution of homogeneous transparent behind the sonic oscillation through 15 minutes, this solution is left standstill in closed environment, be carried out to gel, after the 353K heat treated, flaxen xerogel can be formed, fluorescence sensitivity agent used in the present invention, i.e. semiconductor nano TiO can be formed through heat treatment as the xerogel of presoma
2
Second step: take by weighing the soluble tungsten source of soluble metallic salt and the 0.020mol of 0.020mol, then it is dissolved in slaine and the tungsten source solution of making concentration 0.4mol/L in the 50mL distilled water respectively;
The 3rd step: with the 28mL cyclohexane, the metal salt solution of the 1mL 0.4mol/L that the 3mL Tween-80 and second step make adds in the conical flask successively, rotating speed with 3000rpm fully stirs, add the 1mL amylalcohol again, stir about 15 minutes to reversed micelle solution clarification makes slaine micellar solution, replace metal salt solution with the second step prepared tungsten source solution, adopt identical method to obtain tungsten source micellar solution, then two kinds of prepared micellar solutions are mixed rapidly, and stirring mixed it in 5 minutes under room temperature, behind the question response 12 hours, add the acetone breakdown of emulsion, centrifugal with centrifuge with the rotating speed of 2000rpm, supernatant liquor glue head dropper sucking-off;
The 4th step: the precipitated product that centrifugation is obtained is kept in the absolute ethyl alcohol after cleaning each three times with absolute ethyl alcohol, acetone, distilled water successively, remove supernatant liquor, add the agent of first step gained fluorescence sensitivity again, after stirring 10 minutes with the rotating speed of 3000rpm under the room temperature, add the stirring of 2mL collodion and it was mixed in 1 hour, gained is Coating Materials of the present invention;
The 5th step: as film plating substrate, before the use, adopt the ultrasonic processing of red fuming nitric acid (RFNA), acetone and ethanol 20 minutes respectively with the slide of standard, clean with distilled water flushing again, dry standby;
The 6th step: adopt to flood-technology of lifting prepares nano thin-film, the 5th slide that clean up of step is immersed in the prepared Coating Materials of the 4th step, and control pull rate is 35mm/min, and placement 20 minutes under room temperature, make it air-dry, be placed on then in the Muffle furnace, after 30 minutes, be heated to 1 hour after annealing of 500 ℃ of constant temperature in 200 ℃ of insulations, after reaction finishes, close Muffle furnace, make it slowly reduce to room temperature, promptly obtain the significant doped Ti O of fluorescence synergy
2Tungstate nano film.
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| CNB2005100269339A CN100558471C (en) | 2005-06-20 | 2005-06-20 | Tungstate nano film carries out the method for fluorescence synergy |
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| CN100558471C CN100558471C (en) | 2009-11-11 |
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Granted publication date: 20091111 Termination date: 20120620 |