外文翻译(英文)纳米结构-Bi2S3的制备及其特性

Preparation of Nanostructures and Photoluminescence Bi2S3ZHANG Weixin，QIU Mo，ZHANG Junjun，YANG Zeheng，CHEN Min(School of Chemical Engineering, Hefei University of Technology, Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei , China )Abstract: Bismuth nitrate and sodium sulfide as raw material, two-step hydrothermal method was successfully prepared at 100 Bi2S3 orthorhombic micro ring; Youyi bismuth nitrate and thiourea as the raw material, the use of step hydrothermal synthesized at 150 with Orthorhombics Bi2S3 nanorods. Respectively, X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and fluorescence spectrometry and other means of final product testing phase, morphology and properties were characterized to explore the mechanism of ring formation Bi2S3 microns. The results showed that: Bi2S3 micron diameter ring 1 1.5m, external diameter of 1.5 2m, the average size of about 100nm in the nano-grains assembled. Bi2S3 nanorods diameter of about 125nm, a length of 1 2m. Bi2S3 micron and nano-rod Bi2S3 ring emission peak at 447nm and 470nm are located at, Bi2S3 micron emission peak position of ring Bi2S3 nanorods compared to the emission peak position was a blue shift.Key words: bismuth sulfide; hydrothermal method; nanostructure; photoluminescenceThe performance of nano-materials depends not only on its own structure and composition, but also the size and shape and materials are closely related, and thus the size of nano-materials, structure and morphology of control synthesis to optimize material properties, not only has important Theoretical significance but also broaden the application areas of nano-materials, which has become the field of synthetic chemistry and materials research focus of a front, causing researchers 1 wide interest. Because of its central ring has a very special hole and has many special properties. For example: Aizpurua other study found that the hole in the center gold ring has a strong effect of uniform magnetic field, which makes research in sensing and spectroscopy can be used as nano-hole resonance to support or test other smaller nano-structured materials . 2 In addition, Rothman magnetic ring and other materials found in high density magnetic storage and magnetic random access memory also has potential practical applications. 2The vulcanized bismuth(Bi2S3) is a kind of important semiconductor material, its band gap is a 1.21.7 evs, give or get an electric shock in the thermal, optoelectronics and electrochemistry3 5 keep aspects like hydrogen,etc to have potential application worth.In recent years, Na rice the composition of the structure vulcanized bismuth caused the extensive concern of the researcher. Currently, at Na rice structure the vulcanized bismuth contain a lot of wires that report, mainly have a Na ricethe 6, Na rice is good7, Na rice necklace8 and pan-like in shape5 and rose-like in shape9 etc. construction structure.The Li waits5 with the chlorination bismuth is in the hydrochloric acid aqueous solution water solution income chlorination oxidizing bismuth for forerunner body, with sulfur generation An for sulfur source, in 60 often press down to make from the diameter about the 30 nms, length for the Na rice of the 150200 nms rod weave of average diameter for the thin pan-like in shape vulcanized bismuth of 2 m. The thou national prosperity waits9 with just the right amount of laurel acis the sulfur An salt(salt of 2-undecy 1-1-dithioureido-ethyl- imidazoline, SUDEI) for surface live agent, take chlorination bismuth and sulfur generation Mao An as raw material, adopt melting agent thermal legal system have the rose-like in shape spheroid(diameter about one m) structure that is applied by the slab-like in shape vulcanized bismuth curl overlay.Also have the jot the search concerning vulcanized bismuth nanotube to report moreover.For example, is firm and uncompromising to wait10 take the nitric acid bismuth and the vulcanized sodium as to respond raw material, adopt water thermal law to respond a 12h under 120 and made a vulcanized bismuth nanotube.The experiment takes the nitric acid bismuth and the vulcanized sodium as raw material, under the sistuation that didnt make use of any mold plate, adopt two water thermal composition law, successfully made vulcanized bismuth micron ring.Inquired into the forming mechanism of the vulcanized bismuth micron ring.Rice for carrying on a compare with the vulcanized bismuth micron ring gaining in the structure, performance, and then adopting hot legal system of one-step water to have vulcanized bismuth Na rod.Compared the luminescence quality of these two kinds of different facial look vulcanized bismuths.1. Test1.1 The preparation of sampleThe raw material that experiment uses for the vulcanized sodium, have no water ether, nitric acid bismuth, sulfur Mao, 16 alkyl three A radicle bromines to turn An and sulfuric acid.Above the trying an agent all tries an agent for the analysis purely domestic chemistry, the experiment is used water as distilled water.Two water thermal law makes the step of Bi2S3 micron ring as follows:Square one water is hot:Call to take a 0.05 gs 16 alkyls three A radicle bromines turn An(cetyl trimethyl ammonium bromide, CTAB) to put into a 150 mL the beaker and join 40 mL distilled water, then put beaker on the magnetic force stirrer constantly the rabbling make CTAB resolve full.Call again to take the 0.2 g nitric acid bismuth to put to go into beaker, go on to mix blend certain time.Then hang a muddy liquid of income to transfer an inner lining the 50 mL high pressure pot gathering four fluorine ethylenes amid, place again to take out after the constant temperature 7h in 100 ovens, natural cooling, use distilled water to wash away dirt sediments for many times, then get forerunner thing.The second treads water thermal:Will up gain a forerunner thing to put to go into prosperous have a 40 mL of in the beaker of distilled water, then put the beaker to constantly mix blend on the magnetic force stirrer, again use to move a liquid tube to move to take a little amount solution concentration to go into beaker for the 0.6 mol/L vulcanized sodium drop and go on to mix blend certain time.Hang a muddy liquid of income to transfer an inner lining the 50 mL high pressure pot gathering four fluorine ethylenes amid, place again to take out after the constant temperature 4h in 100 ovens, natural cooling, use distilled water to wash away dirt sediments for many times.Sparse sulfuric acid dissolution:Will up gain sediments to put to go into prosperous have a 20 mL of concentration for the beaker of 2 mol/L sparse sulfuric acid solution, the indoor temperature stat after placing about the 8 hs uses distilled water, have no water ether wash away dirt sediments for many times and dry in 60 it, then get Bi2S3 micron ring.The one-step water thermal law makes the step of the rod of the Bi2 S3 Na rice as follows:Call to take the 0.1 g nitric acid bismuth and 0.2 g sulfur Mao to put into a 150 mL the beaker and join 40 mL distilled water, then put beaker on the magnetic force stirrer constantly rabbling, receive black to hang a muddy liquid.Hang a muddy liquid of this black to take out after transfering to the apposition in the 50 mL high pressure pot in the constant temperature 14h in 150 ovens, natural cooling.Use distilled water and have no water ether to wash away dirt sediments for many times, the sample dries in 60 , then get the Bi2S3 Na rice rod.1.2 Outcome tokenUse D/max xrd type the X shoot wire Yan to shoot(X-ray diffraction, XRD) instrument to carry on thing phase analysis to the sample.Take Cu K as to radiate a source, =0.15418 nms, take care of the voltage as 40 kvs, take care of the current as 100 nms, scan range in 10 70 .Use the accelerating voltage as JEOL of the 10 kvs 7500 B type the field firing Hitachi of scanning the electric mirror(field-emission scan-ning electron microscopy, FESEM) and the accelerating voltage 200 kvs 800 deeply shoot electron micorscope(Transmission elec-tron microscopy, TEM)the facial look and structure of the token sample.Use Hitachi F4500 fluorescence spectrophotometers(fluorospectro-ph- otometry, PL), the excitation light source testings the fluorescence spectrum of sample under the indoor temperature for the Xe lamp.2. Result and discussion2.1 XRD of outcome is analyticalFigure 1 is two water thermal law and one-step water thermal law income outcome of XRD table.Figure 1 amid of table wire 1 and table wire 2 difference be thermal for two water law and one-step water thermal law income outcome of XRD table.All can the beacon change into the quadrature phase Bi2S3.(JCPDF, No.060333)The reaction temperature of two water thermal law responds for 100 , one-step water thermal law carrying on under 150 .From figure 1 amid can discover:One-step water thermal laws gaining the Yan of outcome to shoot peak intensity is higher than two water thermal the law gain outcome.Respond a temperature exaltation, the Yan of sample shoots peak enhancement, the quasi peak breadth narrows down, this instruction with respond temperature scale - up, outcome crystal exaltation for turning a degree.Fig.1 X-ray diffraction (XRD) patterns of the products prepared via the two-step hydrothermal method and the one-step hydrothermal method 2.2 The Bi2 S3 micron annular becomes mechanism analysisForming mechanism of by way of to Bi2S3 micron ring progress quest, made use of FESEM and TEM to observe square one water thermal system of the facial look and structure of the forerunner thing.Figure 2 is the FESEM and TEM photograph of Bi2S3 micron ring forerunner thing.From the figure 2 as it is thus clear that:Forerunner thing from a great deal of biscuit-like in shape circle slab composition, it unipole the diameter of the biscuit-like in shape circle slab is about 12 ms, thickness is 300500 nms.Passing Gao Beis FESEM photograph can observe a forerunner thing further of circular biscuit-like in shape structure.(see figure 2-b) The illustration of left bottom corner is a forerunner thing side - view in the figure 2-b of high double FESEM photograph, can discover circular biscuit from a lot of Na rice circle slab rule earth the overlay apply together but forming of several structure, Na rice circle the slab is very thin, thickness for 2550 nm.The TEM photograph of Bi2 S3 micron ring forerunner thing further recognizes that the forerunner thing presents a solid form, the diameter is about 2 m.(see figure 2 cs)Contrast figure 2 can discover:End outcome Bi2S3 and forerunner thing the fundamental kept consistent on the diameter and the thickness.Fig.2 FESEM and TEM photographs of the precursors of Bi2S3Figure 3 for predict according to the above-mentioned result of the possible forming process of the vulcanized bismuth micron ring diagrammatic drawing.First, Bi(NO3)3 enter water solution to receive a biscuit-like in shape forerunner thing in 100 water thermal condition.Then, the sulfur ion ahead gets rid of an outside layer of thing surface and bismuth ion the reaction forming Bi2S3 housings.Along with the progress for responding, the thickness of Bi2 S3 housingses enlarges gradually, inside the forerunner thing of the layer pit continuously diminish.Because the sulfur ion in the solution is that the quantity isnt enough, responds progress after a period of time the thickness of the Bi2 S3 housingses will because of sulfur ionic scarcity but stop enlarging, have to arrive hard forerunner like this the thing check Bi2 S3 housing form structure.End, check the forerunner thing that hasnt responded complete to resolve with the sparse sulfuric acid aqueous solution of 2 mol/L, forminged Bi2 S3 micron ring.Fig.3 Schematic illustration for the formation of Bi2S3 Microring2.3 The luminescence of the Na rice structure Bi2 S3The size, facial look and crystalline degree etc. of Na rice material will effect the luminescence quality of material to some extent.1112 Bi2S3 micron rings and Na rice are good to measure while stiring up the wavelength as 325 nms of fluorescence spectrum.Can discover:2 kinds of outcomes all have more apparent fluorescence luminescence peak, the Bi2S3 micron ring luminescence peak is located in a 447 nm, the luminescence peak of the Na rice rod form Bi2S3 is located in a 470 nm, the Bi2S3 micron ring luminescence peak is compared to a Na rice rod the luminescence peak of the form Bi2S3 obviously took place blue to move.This may be in order to constituting the Na rice of Bi2S3 micron ring opposite Bi2S3 Na rice rod Cu of grain and having more apparent size effect and resulting in.3. Conclusion (1) With Bi(NO3)3H2O5 and Na2SH2O are raw materials, adopt two water thermal law, make from the average size about is the Na rice bore of grain construction but become with 100 nms for the 11.5 m and external diameter for the quadrature of 1.52 m crystal train Bi2S3 micron ring;Again with the Bi(NO3)35 H2O and sulfur Mao for raw material, adopt one-step water thermal law, make a diameter about the 125 nm, length for the quadrature of 12 m crystal train Bi2S3 Na rice rod. （2）The facial look of outcome as to its the fluorescence quality contain important impact.The luminescence peak of Bi2S3 micron ring and Na rice rod-like in shape Bi2S3 is located in 447 nm and 470 nm respectively, Bi2 S3 micron rings giving out light the location of peak is compared to a Na rice rod the location of luminescence peak of the form Bi2S3 obviously took place the blue move, may be because constitute the Bi2S3 micron ring of Na rice grain opp