9B120S-3M AGV小车用直流无刷电机首选TROY
价格：￥500元
所在地：厂商性质：代理商
品牌：型号：9B120S-3M
本网采购热线：<font color="#71-
9B120S-3M9B120S-3M9B120S-3M&愿你 一直是个孩子 看这个世界都是美好 &愿你 一直是个少年 做什么事都朝气蓬勃 &愿你 此后做的每一个选择都是为了自己愿你 将来结婚都是因为爱情 而不是因为合适愿你 做的都是自己喜欢的事 && & & & & & & & & & & & & & & & & & & & & & & &---------每日摘&销售热线:181-92-5752967联系人：张工&&&& &QQ:厦门伊诗图电气主营：TROY泰映减速电机TROY泰映直流电机TROY泰映驱动器SPG小功率马达SPG减速电机CPG晟邦减速电机韩国DKM减速电机Harmonic谐波减速机Harmonic行星减速机TWT东炜庭减速电机STS成钢减速电机TROY泰映减速电机ASTK海鑫减速电机ALT爱德利减速电机ALT爱德利变频器MCN明椿减速电机ZD中大减速电机GPG台邦减速电机TL东力减速电机JSCC精研减速电机*****************厦门伊诗图电气有限公司**************************直流电机是电机的主要类型之一。一台直流电机即可作为发电机使用，也可作为电动机使用，用作直流电机可以得到直流电源，而作为直流动机，由于其具有良好的调速性能，在许多调速性能要求较高的场合，仍得到广泛使用。一、直流电机的用途1、作电源用-直流电机，将机械能转化为直流电能;2、作动力用-直流电机，将直流电能转化为机械能;3、做励磁机用，一般小于10万kW即100MW的单机同步发电机要用直流发电机作为励磁机4、信号传递-直流测速发电机，将机械信号转换为电信号;5、信号传递-直流伺服电动机，将控制信号转换为机械信号。二、直流电机的优缺点1、直流电机的电势波形较好，对电磁干扰的影响小。2、直流电机的调速范围宽广，调速特性平滑。3、直流电机过载能力较强，热动和制动转矩较大。4、由于存在换向器，其制造复杂，价格较高。&&&直流电机特点定子1、主磁极主磁极的作用是产生气隙磁场。主磁极由主磁极铁心和励磁绕组两部分组成。铁心一般用0.5mm～1.5mm厚的硅钢板冲片叠压铆紧而成，分为极身和极靴两部分，上面套励磁绕组的部分称为极身，下面扩宽的部分称为极靴，极靴宽于极身，既可以调整气隙中磁场的分布，又便于固定励磁绕组。励磁绕组用绝缘铜线绕制而成，套在主磁极铁心上。整个主磁极用螺钉固定在机座上，2、换向极换向极的作用是改善换向，减小电机运行时电刷与换向器之间可能产生的换向火花，一般装在两个相邻主磁极之间，由换向极铁心和换向极绕组组成。换向极绕组用绝缘导线绕制而成，套在换向极铁心上，换向极的数目与主磁极相等。3、机座电机定子的外壳称为机座。机座的作用有两个：一是用来固定主磁极、换向极和端盖，并起整个电机的支撑和固定作用；二是机座本身也是磁路的一部分，借以构成磁极之间磁的通路，磁通通过的部分称为磁轭。为保证机座具有足够的机械强度和良好的导磁性能，一般为铸钢件或由钢板焊接而成。4、电刷装置电刷装置是用来引入或引出直流电压和直流电流的。电刷装置由电刷、刷握、刷杆和刷杆座等组成。电刷放在刷握内，用弹簧压紧，使电刷与换向器之间有良好的滑动接触，刷握固定在刷杆上，刷杆装在圆环形的刷杆座上，相互之间必须绝缘。刷杆座装在端盖或轴承内盖上，圆周位置可以调整，调好以后加以固定。转子1、电枢铁心电枢铁心是主磁路的主要部分，同时用以嵌放电枢绕组。一般电枢铁心采用由0.5mm厚的硅钢片冲制而成的冲片叠压而成，以降低电机运行时电枢铁心中产生的涡流损耗和磁滞损耗。叠成的铁心固定在转轴或转子支架上。铁心的外圆开有电枢槽，槽内嵌放电枢绕组。2、电枢绕组电枢绕组的作用是产生电磁转矩和感应电动势，是直流电机进行能量变换的关键部件，所以叫电枢。它是由许多线圈（以下称元件）按一定规律连接而成，线圈采用高强度漆包线或玻璃丝包扁铜线绕成，不同线圈的线圈边分上下两层嵌放在电枢槽中，线圈与铁心之间以及上、下两层线圈边之间都必须妥善绝缘。为防止离心力将线圈边甩出槽外，槽口用槽楔固定。线圈伸出槽外的端接部分用热固性无纬玻璃带进行绑扎。3、换向器在直流电动机中，换向器配以电刷，能将外加直流电源转换为电枢线圈中的交变电流，使电磁转矩的方向恒定不变；在直流发电机中，换向器配以电刷，能将电枢线圈中感应产生的交变电动势转换为正、负电刷上引出的直流电动势。换向器是由许多换向片组成的圆柱体，换向片之间用云母片绝缘。4、转轴转轴起转子旋转的支撑作用，需有一定的机械强度和刚度，一般用圆钢加工而成。Heidenhain VRZ 402 DisplayHEIDENHAIN - SCALE ENCODER / AMPLIFIER BOX UNIT EXE-602-B / 223-185-02HEIDENHAIN ROD426 (ROD 426 -03 R) ENCODER NEWHeidenhain Linear Encoder LS 476 LS476
newHEIDENHAIN I/O BOARD CAT#VD030Heidenhain 246.842.02 Encoder Module EXE-602E ! WOW !Heidenhain 331.918.13 Interpolation Module ! WOW !Heidenhain LS303 Digital Readout Scale ! WOW !HEIDENHAIN ROD 260-1000 K2 ENCODER ID NR 224 847 06Heidenhain LIP 101R Id.Nr. 247 657 01BRAND NEW HEIDENHAIN ROTARY ENCODER MODEL ROD 425 ID # 332 381-01 5 VOLTSHEIDENHAIN ENCODER ROD 420 (ID # 295 281-73) and (ID # 295 281-74) *NEW *NEW! Heidenhain Incremental Encoder ROD
(1024 Line Counts / Rev)Heidenhain Interpolation Digitizing Box IBV 600, IBV600, IBV 6OO, 277 236-01HEIDENHAIN CORP
FNFP 5" Spdl 198" X Cincinnati-Gilbert J HORIZONTAL BORING MILL, HEIDENHAIN TNC 426CB4" GIDDINGS & LEWIS HORIZONTAL BORING MILL - TOOLING - HEIDENHAIN 3 AXIS DRO1999 CHARMILLES HD8 EDM HOLE DRILL w/HEIDENHAIN DRO, AUTO CYCLE CONTROL1997 DENVER "ASTRO II" MONOSET TOOL & CUTTER GRINDER w/HEIDENHAIN 2 AXIS DROHeidenhain KGM 182 Grid EncoderHEIDENHAIN CORP 237-134-94 NSFP HEIDENHAIN LINEAR ENCODER DUPLOMATIC SMA-P-20 SERIES 23Heidenhain Certo CT-2501 Ultra High Accuracy Length GaugeBridgeport Series 1 W/ Heidenhain Digital Read Out 42" TableHEIDENHAIN CORP TNC131BM USPP TNC131BMHeidenhain LE-406, 206, 841601Heidenhain Display Unit ND 510 _ ND510 _ 276 606 03 _
_ ND51OHeidenhain 270mm Scale LS 504, LS504, LS-504, LS 5O4, 403-130-13, 270mm, LS 503Heidenhain Scale LS 106 _ LS106 _ LS-1O6 _ LS1O6 _ 295-709-40 _
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_ ML 420MM30 Royal VARISET TOOL PRESETTER, HEIDENHAIN DRO, OPT. COMP., (9) POSITION TURRETHardinge Heidenhain Spindle Motor
QAN 260L&HEIDENHAIN CORP 336-451-05 USPP HEIDENHAIN CORP 344-963-19 USPP HEIDENHAIN AXIS SCALE LS-187C 1740MM SCL-0336 *NEW*HEIDENHAIN SCALE LS-186C 1640MM SCL-0167 *NEW*NEW HEIDENHAIN RCN 729 ENCORDER NIBHeidenhain LS176C Glass Scale&D HEIDENHAIN CORP LINEAR SCALE LS623 1540MMYASKAWA LINEAR SERVO MOTOR SGLFM,XU-ACT97L,HEIDENHAINROYAL TOOL SETTER PRESETTER WITH TONS OF EXTRAS HEIDENHAIN DRO GREAT SHAPENEW LC-182 Heidenhain Glass Scale 3 &m 940mm NEW! LC 182 Heidenhain Glass Scale 3 &m 940mm NEW. LC 182 Heidenhain Glass Scale 3&m 940mm LC 182 Heidenhain Glass Scale 3 &m 940mm NEW LC 182 Heidenhain Glass Scale 3 &m 940mm NEW
LC 182 Heidenhain Glass Scale 3 &m 940mm&HEIDENHAIN CORP ROD-800 NSPP ROD800HEIDENHAIN AXIS SCALE LS-187C 1240MM SCL-0334 *NEW*HEIDENHAIN AXIS SCALE LS-186C 1240MM SCL-0104 *NEW*HEIDENHAIN CORP 242-659-03 USPP HEIDENHAIN SCALE LS-186C 940MM SCL-0135 *NEW*HEIDENHAIN AXIS SCALE LS-187C 890MM SCL-0324 *NEW*HEIDENHAIN SCALE RNC 223FSiemens Permanent Servo Motor 1FT 3EA2 _ HEIDENHAIN EQN 8&Heidenhain Linear Scale LS703 1740mm 68.5inNEW LC 181 - Heidenhain Glass Scale 3 &m 740mmNEW LC 182 - Heidenhain Scale 3 &m 740mm NEW - Heidenhain Scale LC 182 3 &m 740mm HEIDENHAIN CORP 284-807-30 USPP Royal Variset 50 Taper With Heidenhain DRO ReadoutHEIDENHAIN ENCODER RON 350-2048HEIDENHAIN LS 487 SEALED LINEAR ENCODER (MPN/594 875-02)HEIDENHAIN RETROKIT DRO PACKAGE for HARDINGE 6" x 20" LATHE NEW DIGITAL READOUTNEW LC 182 - Heidenhain Scale 3 &m 740mm NEW LC 181 - Heidenhain Glass Scale 3 &m 740mm SN EnDat (synchronous serial)HEIDENHAIN CORP 362-579-05 NSFP HEIDENHAIN RETROKIT ND780 DRO PACKAGE for 14" x 40" LATHE - NEW DIGITAL READOUTCNC BRIDGEPORT INTERACT MODEL 412 VMC. Heidenhain Control. NO RESERVE!!HEIDENHAIN AXIS SCALE LS-187C 740MM SCL-0322 *NEW*HEIDENHAIN AXIS SCALE LS-186C 740MM SCL-0105 *NEW*Heidenhain 287-807-20 Control Unit EXE-922 ! WOW !Heidenhain 287-807-21 Control Unit EXE-924 ! WOW !Heidenhain Linear Scale LS704 1740mmNEW LC 182 Heidenhain Glass Scale 5 &m 940mm NEW LC 182 Heidenhain Glass Scale 5 &m 940mm Heidenhain BF 150 Id.Nr.353 522-04Heidenhain LS403 New In BoxHeidenhain LS704/420HEIDENHAIN RETROKIT DRO PACKAGE for 2-AXIS 12" x 36" MILL - NEW DIGITAL READOUTHeidenhain 287-807-30 Control Unit EXE-934 ! WOW !HEIDENHAIN AXIS SCALE LS-187C 690MM SCL-0321 *NEW*HEIDENHAIN AXIS SCALE LS-186C 740MM SCL-0105 *NEW*NIB Heidenhain LS186 Scale_LS1861234_ML
23HEIDENHAIN CORP 237-134-80 NSFP HEIDENHAIN ENCODER ROD 431.001-1024HEIDENHAIN CORP LC-191-F NSPP LC191FHEIDENHAIN SCALE LC-192F 640MM SCL-0242 *NEW*HEIDENHAIN Y AXIS SCALE LS-MM SCL-0101 *NEW*HEIDENHAIN AXIS SCALE LC-183 640MM SCL-0341 *NEW*HEIDENHAIN LC 483/470MM ID Heidenhain Linear Encoder LS 176 336 959-93 ML 640 mmHeidenhain PWM 8 Diagnostic Set PWM8NEW LC 182 Heidenhain Glass Scale 5 &m 740mm NEW LC 182 Heidenhain Glass Scale 5 &m 740mm
inspection certificateHeidenhain 753B Dr.Johannes Heidenhain DRO 22190 AHeidenhain Model TS631 Touch Probe, Id 309-930-01, SK40, CNC, Inspection ToolHEIDENHAIN ENCODER ROD 431.020-1024HEIDENHAIN ENCODER ERN 431 1024 BRAND NEWSchneeberger X - Y 10"x10" Manual 2 Axis Positioning Stage W/ Heidenhain EncoderHEIDENHAIN LINEAR ENCODER LS406-320mm+EXE102+CABLEHEIDENHAIN ENCODER ROD 431.025-1024HEIDENHAIN ENCODER ROD 320.005 -2500HEIDENHAIN LS706 NEW SCALE LS706NIB Heidenhain Scale Mounting Instructions LS186_ML540 mm_336 960 16 HEIDENHAIN ENCODER EQN 1325.5DSK-13B12HEIDENHAIN ROD 426.001B-1000 ENCODERNNB Heidenhain Corp. Scale 262 181 21 _
_ LS406 _ ML 320mmHEIDENHAIN ENCODER ROD 426--03HEIDENHAIN ENCODER ERN 48HEIDENHAIN ENCODER ERN 8HEIDENHAIN ENCODER ERN 8HEIDENHAIN ENCODER ERN S14-70HEIDENHAIN ENCODER CHECKER VRZ 460Heidenhain LS106LC191F-ML540 HEIDENHAIN SCALE *NEW*HEIDENHAIN LS 106 - SEALED LINEAR ENCODER - MEASURING LENGTH 740mmReturns: AcceptedSiemens Permanent Magnet Servo Motor 1FT 3AA1 HEIDENHAIN ERN HEIDENHAIN ENCODER ROD 320.002-2000HEIDENHAIN
GLASS SCALE NEW HEIDENHAIN
GLASS SCALE NEW Siemens Servo Motor 1FT 3AA1 _ Heidenhain ERN 8LS406C HEIDENHAINHeidenhain LE360C CNC Control Unit LE 360 C 360CHeidenhain LE360C CNC Control Unit LE 360 C 360C "Y-Axis Output Moved"HEIDENHAIN CORP LC-182 NSFP LC182HEIDENHAIN ENCODER EQN 8HEIDENHAIN ENCODER EQN 8HEIDENHAIN ENCODER ROD 426.HEIDENHAIN ENCODER ROD 426 1000HEIDENHAIN ENCODER EQN 8HEIDENHAIN ENCODER ERN 8Heidenhain Drive CNC Control Unit LE 351 B_LE351B_243 992 80_478SIEMENS MOTOR 1FT-1FA0 & ENCODER HEIDENHAIN 291 843 01 GERMAN BMC&heidenhain tnc 150 control cnc controller completeHEIDENHAIN CORP
FNFP NEW HEIDENHAIN LC 192F LINEAR SCALE LC 192F Heidenhain LC191F/540HEIDENHAIN LF 401C SLIMLINE LINEAR ENCODER 50MM-1220MM DRO LINEAR SCALESHeidenhain ROD320.200-2000 Encoder CR-1 ! WOW !NEW LS 176 - Heidenhain Glass Scale 5 &&m 540mmNEW LC 182 Heidenhain Glass Scale 5 &m 740mm
absolute position measureHeidenhain LS406C , New, LS406C, Fast ShippingHeidenhain LS406C , New, LS406C, Fast ShippingHEIDENHAIN ENCODER ROD 426--03HEIDENHAIN ENCODER ROD 320-2500HEIDENHAIN LC-191-F LINEAR SCALE LC191F ML 340MM&HEIDENHAIN LF103 LINEAR ENCODER 1140MM MEASURING LENGTH Digital Readout DRO SlidHEIDENHAIN LINEAR ENCODER LS 476CHEIDENHAIN ENCODER ROD 426.000B-1500HEIDENHAIN ENCODER ROD 320.005-5000HEIDENHAIN ND 231 ND231 DISPLAY UNIT ID NR 284 048 11&HEIDENHAIN ENCODER EQI HEIDENHAIN CORP LS406C NSFP LS406CHEIDENHAIN CORP LS486C470MM NSFP LS486C470MMHEIDENHAIN CORP QSY155C NSPP QSY155CHEIDENHAIN ENCODER ERN 281.Heidenhain LS176/340HEIDENHAIN LF 103 LINEAR ENCODER 540MM MEASURING LENGTHHeidenhain Digital Length Gauge MT25 MT 25 newLS706 HEIDENHAIN NEW IN BOX!IJR MOTOR HMION-E HM10N-E HM 10N-E ENCODER HEIDENHAIN ROD 436.001 220 543 01&IJR DC SERVO MOTOR HMION-E HM10N-E HM ION-E W/ HEIDENHAIN ENCODER 436.001HEIDENHAIN ENCODER ERN 8HEIDENHAIN VRS 401 COUNTER DISPLAY 239 930 01HEIDENHAIN ENCODER ROD 320.002-1250LS406C HEIDENHAINHEIDENHAIN SCALE ML 370 LS 623 ID# 228 861 09Heidenhain Scale LS 704 LS704 LS 7O4 LS7O4_H_94"_237-133-21_5053HEIDENHAIN GLASS SCALE LIP 401R 294 850 R SER # 2276808HEIDENHAIN GLASS SCALE LP 501R P8 G0 ML 230MM +/- 1.0UMNIB Heidenhain Scale w/ Mounting Instructions LS186_ML340 mm_336 960 14NEW LS 186C - Heidenhain Glass Scale 5 &&m 740mmHeidenhain MRZ-742-B MRZ742B Digital Readout DroHEIDENHAIN ENCODER EQI HEIDENHAIN CORP 216-750-BX NSFP 216750BXHeidenhain ERA 1AK. RA4KG 300TC
NEWHEIDENHAIN CORP
FNFP HEIDENHAIN AE LS 486C GLASS SCALE NEW 12HEIDENHAIN LIDA407 ID# EXPOSED LINEAR ENCODERHeidenhain Linear Glass Scale LS 704 316564BR NEW!!!HEIDENHAIN ENCODER ROD 320.002-2500HEIDENHAIN ENCODER ERN 8,FOR SIEMENS SERVO MOTOR 1PH-0BC2EXE650BX25/10 HEIDENHAINHEIDENHAIN 245.100.25 LS 405 LINEAR SCALE ENCODER 366mm NEWHEIDENHAIN AE LS 176 NEW AELS176 REPLACEMENT 658-718-04New in Box Heidenhain Linear Encoder / Gauge MT--01HEIDENHAIN HEIDENHAIN METRO HIGH ACCURACY LENGTH GAUGE MT 25W&Heidenhain VRZ 740 Dr.Johannes Heidenhain DRO 172101HEIDENHAIN SCALE ML 370 LS 623 ID#316 560 09Heidenhain LC191F/100/240MHEIDENHAIN TNC 150 BOARD 048HEIDENHAIN TNC 150 BOARD 448HEIDENHAIN TNC 150 BOARD 448Heidenhain LC191F/440HEIDENHAIN ENCODER ERN 8,FOR SIEMENS SERVO MOTOR 1PH-0BC2HEIDENHAIN ENCODER (ONLY) 291 843 01 BMC 4020 1 FT-1FA0 320.005 2500HEIDENHAIN ENCODER (ONLY) 291 843 01 CNC BMC 4020 HT ROD 320.005 2500 SIEMENSHEIDENHAIN ENCODER (ONLY) 291 843 01 GERMAN BMC 4020 HT HURCOHEIDENHAIN ENCODER RQN 425 512HEIDENHAIN PROBE MT 25W 231-013-03 .231-013-03HEIDENHAIN LS704 SCALE 336 978 C6 NIBHeidenhain LS186C/640LS704 HEIDENHAIN NEW IN BOX!HEIDENHAIN CORP V USPP 5896116VHEIDENHAIN SCANNING UNIT 253 329 40
LS 730 LS730 KF03.00 SN 013433 NEWHeidenhain TNC 151 BE212New Heidenhain TNC 355 BE412 LCD UpgradeHeidenhain TNC 355 BE412BHEIDENHAIN LS 706 NEW SCALE LS706VERY NICE HEIDENHAIN 13-3/4" GLASS SCALE DIADUR C10 LID 350/10 ENCODER 235 59001Heidenhain Abtastkopf KGM Id.Nr. 290 261 01&NEW! Heidenhain Encoder ROD 529 / (10000 Line Counts / Rev)68.4" Heidenhain 1740 mm LS 106 DRO Scale 336 958-28Heidenhain large Incremental Angle Encoder Model ROD700LS703 HEIDENHAINHEIDENHAIN CORP
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ROQ 425 -58 Encoder 5Volt *New in Box*HEIDENHAIN Id.Nr. 539 332-01 ROQ 425 -58 Encoder 5Volt *New in Box*HEIDENHAIN 100mm LINEAR ENCODER LF 401C LINEAR SCALE NEWHeidenhain Model: MT 25W, IdNr: 231 013-03 Probe&RECKERMANN TRAVERSA 2015 73" HEIDENHAIN LINEAR SCALE LS603C ML1740 73" ML1740HEIDENHAIN Encoder Scale LIDA 407, 6M roll NEW in BOXEnlargeHEIDENHAIN 8 ENCODER goodHeidenhain Scale&Readhead LB301 {PRICE IS PER SCALE} Ship-UPS or USPS or ?EnlargeLC481 HEIDENHAIN 370 MMROQ425 HEIDENHAIN NEW IN BOX!Heidenhain TNC 355 BE412B BE412Heidenhain dripfeed module board PL 410 B PL 410B&HEIDENHAIN CORP MT12-P NSFP MT12PRebuilt Heidenhain Linear Scale Encoder D-8225 ML 320mm ID NR. 216 750 3CHEIDENHAIN CORP EQN8 USPP EQNHeidenhain Operator Panel TE 400_TE400_ID NR 250 517 03_254 495 01 00 04 79HEIDENHAIN ENCODER ROC 413 -58Heidenhain Linear Encoder LS 623 ML 320mmNEW HEIDENHAIN LC 183 440
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Attractors for the 3D baroclinic quasi-geostrophic equations of large-scale atmo.
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Attractors for the 3D baroclinic quasi-geostrophic
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导读：MaterialsLetters63(93ContentslistsavailableatScienceDirectMaterialsLettersjournalhomepage:/locate/matletRapidsynthesisofZnOellipsoidalnanostructuresinla
MaterialsLetters63(93
ContentslistsavailableatScienceDirect
MaterialsLetters
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RapidsynthesisofZnOellipsoidalnanostructuresinlargescaleandtheirphotoluminescenceproperties
DafengZhanga,b,DaidongGuob,XipengPu?,b,XinShaob,RenminLiua,LeiLib,XianhuaQianb
SchoolofChemistryandChemicalEngineering,LiaochengUniversity,Liaocheng252059,People'sRepublicofChinaSchoolofMaterialsScienceandEngineering,LiaochengUniversity,Liaocheng252059,People'sRepublicofChina
articleinfoabstract
ZnOellipsoidalnanostructureswithuniformellipsoidalmorphologieshavebeensynthesizedusingdifferenthydroxideanionprecursorsbyanultra-fast,facile(90°C)solution-phasemethodwithouttheassistanceofsonicationoranysurfactants.TheproductswerecharacterizedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),andphotoluminescence(PL)measurements.Basedontheexperimentalresults,agrowthmechanismofZnOnanostructureswasproposed.TheobtainedZnOnanostructuresexhibitaweakUVemissionbandat~385nmandarelativelystrongerorangeemissionbandat~615nm.Thesolution-phasemethodissimple,convenientforlarge-scalefabricationofZnOellipsoidalnanostructures.
?2009ElsevierB.V.Allrightsreserved.
Articlehistory:
Received7May2009Accepted28July2009
Availableonline3August2009Keywords:
SemiconductorsNanostructuresEllipsoidalLuminescence
1.Introduction
Zincoxideisanimportantn-typesemiconductorwithawideanddirectbandgapof3.37eVandalargeexcitonbindingenergyof60meVatroomtemperature,whichmakesitapromisingcandidateforsurfaceacousticwave(SAW)?lters,nanoscalelasers,light-emittingdiodes(LEDs)andotherfunctionalnanodevices[1,2].Consequently,ZnOnanostructureswithvariousmorphologieshavebeenprepared,suchasnanowire[2],nanobelt[3],ellipsoidal[4C6],?ower-like[7],tower-like[8],tube-like[9],doughnut-like[10],?ake-like[11],andnet-like[12].
Amongthem,theZnOellipsoidalnanostructuresareofgreatscienti?candtechnologicalinterest.AlthoughsomegroupshavesynthesizedZnOellipsoidalnanostructuresbyusingdifferentmeth-ods[4C6],thesemethodspossesssomedisadvantages,suchaslongreactiontime,usingorganicadditivesorsonicationprocessing.Herein,wereportanultra-fast,simple,facile(90°C)solution-phasefabricationofZnOnanostructureswithellipsoidalmorphologywithouttheassistanceofsonicationoranysurfactants.TheeffectofhydroxideanionprecursorsonthesizesandmorphologiesofZnOnanostructureswasstudies.Thepossiblegrowthmechanismofthesenanostructureswasproposed.2.Experimentalprocedures
Allofthechemicalreagentswereofanalytic-gradeandusedwithoutfurtherpuri?cation(purchasedfromShanghaiChemical
ReagentCo.,Ltd.,Shanghai,China).Zincnitratehexahydrate(Zn(NO3)2?6H2O)wasusedaszincsource,andammoniasolution(NH3?H2O,25wt.%),ethylenediamine(EDA,NH2CH2CH2NH2),triethanolamine(TEA,N(C2H4OH)3),hexamethylenetetramine(HMT,(CH2)6N4,99%)wereusedashydroxideanionprecursors.Inatypicalexperiment,0.05MZn(NO3)2solutionwasprepared?rstbydissolvingappropriateamountofZn(NO3)2?6H2Ointo60mlde-ionizedwater.Thenthesolutionwastreatedinawaterbathof90°Cfor5min.Hydroxideanionprecursorwasaddedintotheabove
?Correspondingauthor.
E-mailaddress:puxipeng@(X.
X/$Cseefrontmatter?2009ElsevierB.V.Allrightsreserved.doi:
10.1016/j.matlet.
Fig.1.XRDpatternsofsamplessynthesizedusingdifferenthydroxideanionprecursors:NH3?H2O,EDA,TEA,HMT.
D.Zhangetal./MaterialsLetters63(932291
Fig.2.SEMimagesofZnOnanostructuressynthesizedusingdifferenthydroxideanionprecursors.(a,b)NH3?H2O,(c,d)EDA,(e,f)TEA,(g,h)HMT.
aqueoussolutiondropbydropwithvigorouslymagneticstirringuntilpH=7,andthemilk-likesolutionwasallowedtocooltoroomtemperaturenaturallyunderstirring.Finally,thewhiteproductswasseparatedusingcentrifugation,washedwithwaterandabsoluteethanolseveraltimesandthendriedat60°Cinairfor12h.TheproductswerecharacterizedbyX-raypowderdiffraction(XRD,D8ADVANCE,BrukerCo.Ltd.,Germany)withCuKαradiation.MicrostructuresoftheproductswereobtainedbyFieldEmissionScanningElectronMicroscopy(FE-SEM,S4800,HitachiLtd.,Japan).Photoluminescence(PL)measurementswereachievedonaFLS
2292D.Zhangetal./MaterialsLetters63(93
Fig.3.Majordiameters,minordiametersandratioofmajortominordiameterofZnOnanostructuressynthesizedusingdifferenthydroxideanion
precursors.
FluorescenceandPhosphorescenceSpectrometer(EdinburghInstru-mentsLtd.,theUnitedKingdom).3.Resultsanddiscussion
Fig.1showstheXRDpatternsofobtainedZnOnanostructures.Allpatternspossessthehexagonalwurtzitestructure(JCPDScardnumber36-1451).Ascomparedwiththeintensityof(002)peakinthestandarddiffractionpattern,(002)peakspossessslightlyhigherintensities,indicatingthatthestructureofZnOnanostructureshasapreferentialorientationalongthecaxis.
Fig.2showsSEMimagesoftheas-preparedZnOnanostructuressynthesizedusingdifferenthydroxideanionprecursors.AllsamplesexhibitellipsoidalmorphologiesinthecaseofNH3?H2O,EDAandTEA,exceptthecolumnmorphologyinthecaseofHMT.Inaddition,allnanostructureshaveajointboundaryperpendiculartothemajoraxis,whichdividestheellipsoidalparticlesintotwosemi-parts.FurthercarefulexaminationofFig.2revealsthatnanostructureshavearoughsurfaceonwhichZnOnanoparticlesandnanorodscouldbefound,whichindicatesthatas-receivedZnOnanostructuresareassembledbynanoparticlesandnanorods.Moreover,nanorodshaveaprefer-entialorientationparalleltothemajoraxis,whichisconsistentwiththeXRDresult.Fig.3showsthemajordiameters,minordiametersandratioofmajortominordiameterofZnOnanostructuressynthesizedusingdifferenthydroxideanionprecursors.Theaveragemajorandminordiametersarearound1.0umand0.5um,respectively,exceptthelargerdiametersinthecaseofTEA.Theratiosofmajortominordiametersarearound1.4,andinthecaseofEDAtheratioishighestof2.3,asshowninFig.2(c,d).
Onthebasisofabovediscussion,itispossibletointerprettheformationprocess,asshowninFig.4.Firstly,hydroxideanionprecursorhydrolyzesrapidlyandhydroxideanions(OH?)were
Fig.4.SchematicillustrationofthegrowthmechanismofZnO
nanostructures.
Fig.5.TheroomtemperaturephotoluminescentspectrumofZnOnanostructuressynthesizedusingdifferenthydroxideanionprecursorsatpH=7:(a)NH3?H2O,(b)EDA,(c)TEA,(d)HMT.
released.TheZn2+reactwiththereleasedOH?,andtheZnOnucleiwillbeobtained,whichcanbedescribedasfollows[13]:Zn
tOH?→ZneOHT2?
Secondly,ZnOnucleigrowpreferentiallyalongthe[0001]directiontoformnanorodsintheinitialgrowthstageofZnOcrystals[14].Meanwhile,thenanorodsassemblythroughtheorientedattachmentalongthec-axis[0001]andthenfusing,formingtheframeworksoftheZnOnanostructures[15,16].Moreover,theseprotuberancesandridgesontheroughsurfaceandthere-entrantcornersintheframeworksarefavorableforthefurthernucleation,growthandattachmentofsmallercrystals[17].Consequently,thevoidsbetweennanorodswere?lledbynanoparticles.Finally,thedenseellipsoidalZnOnanostructureswereformed.
Theroom-temperaturePLspectrarecordedfromthedriedsamples(Fig.5)showsthatallofthesespectradisplayaweakultraviolet(UV)emissionbandat~385nmandarelativestrongervisibleemissionbandat~615nm.UVemissionpeakcorrespondstothenearbandedgeemission[18].Theoriginoforangeemissionseemstoinvolvetheinterstitialoxygenions(O?i)[19,20].4.Conclusions
Insummary,ZnOellipsoidalnanostructureswithuniformellip-soidalmorphologieshavebeensuccessfullysynthesizedbyanultra-fast,simple,facile(90°C)solution-phasemethodwithouttheassistanceofsonicationoranysurfactants.Morphologiesofnanos-tructuresallexhibitellipsoidalpatterns,exceptthecolumnmorphol-ogyinthecaseofHMT.Hydroxideanionprecursorisakeyfactorthataffectsthesizeofnanostructures.Basedontheresultsoftheexperiments,amechanismfortheformationofZnOnanostructureswasproposed.TheseobtainedZnOnanostructuresexhibitaweakUVemissionbandat~385nmandarelativelystrongerorangeemissionbandat~615nm.Acknowledgements
ThisworkwassupportedbyCollegeStudents’Sci-techandCultureInnovationFoundationinLiaochengUniversity(SRT08001CL2).References
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