quá trình chuyển pha ZnS ZnO của các cấu trúc nano ZnS một chiều

Header Page of 258 LI CM N hon thnh c quyn lun ỏn ny l nh vo cụng lao rt ln ca hai ngi thy hng dn tụi l PGS.TS Phm Thnh Huy v TS Trn Ngc Khiờm ó hng dn rt tn tỡnh v giỳp tụi rt nhiu quỏ trỡnh thc hin lun ỏn Vin Tiờn tin Khoa hc v Cụng ngh Bng tn ỏy lũng, tụi xin chõn thnh by t lũng bit n sõu sc n Thy Phm Thnh Huy, ngi ó tn tỡnh giỳp cho tụi ý tng, nh hng nghiờn cu cng nh to mi iu kin thun li quỏ trỡnh lm thc nghim v giỳp v vt cht ln kin thc cho tụi quỏ trỡnh hc v nghiờn cu ti trng i hc Bỏch khoa H Ni Tụi xin chõn thnh cm n rt nhiu ti Ban Lónh o Vin AIST, ITIMS ó nhit tỡnh giỳp v to mi iu kin cho tụi lm thc nghim v nghiờn cu thi gian qua Tụi cng xin by t lũng bit n n cỏc Thy cụ giỏo v cỏc cỏn b ca Vin AIST ó giỳp tn tỡnh sut quỏ trỡnh nghiờn cu v hc Tụi xin cm n n TS Nguyn Duy Hựng, ThS Nguyn T ó giỳp cho tụi o cỏc phộp o hunh quang v cng xin cm n n GS TS Nguyn c Chin, PGS TS Trn Kim Anh, TS Trnh Xuõn Anh v TS o Xuõn Vit ó cú nhiu ý kin úng gúp cho lun ỏn Trong quỏ trỡnh nghiờn cu, tụi cũn nhn c s giỳp ca cỏc Phũng ban chc nng ca HBK HN, Phũng thớ nghim ca Vin Khoa hc Vt liuVin Hn lõm Khoa hc v Cụng ngh Vit Nam, Trung tõm Khoa hc Vt liu HKHTN - HN, Phũng thớ nghim Hin vi in t - Vin V sinh Dch t Trung ng, Phũng thớ nghim Lumilab Khoa khoa hc cht rn - i hc Gent - B Tụi xin chõn thnh cm n n mi s giỳp ny Tụi cng xin cm n n Ban Giỏm Hiu Trng i Hc Cụng nghip Qung Ninh, Ban Ch Nhim Khoa Khoa Khoa hc C bn, B mụn Vt lý ó to mi iu kin thun li cho tụi i nghiờn cu v bo v lun ỏn tin s H Ni ng thi, tụi cng xin gi li cỏm n n tt c cỏc bn hc viờn NCS - AIST, ITIMS, bn bố ó ht lũng ng viờn tinh thn tụi thi gian thc hin lun ỏn Cui cựng, tụi xin cm n ti gia ỡnh, h hng v ngi thõn ca tụi, nhng ngi ó luụn ng viờn tinh thn v giỳp vt cht Tụi khụng bit núi gỡ hn ngoi li cm n sõu sc, chõn thnh ti nhng ngi thõn yờu nht ca tụi Ni dung nghiờn cu ca lun ỏn nm khuụn kh thc hin ti NAFOSTED mó s 103.02.102.09 v ti Nghiờn cu c bn nh hng ng dng mó s DTDL.5-2011-NCCB Tỏc gi Quang Trung i Footer Page of 258 Header Page of 258 LI CAM OAN Tụi xin cam oan õy l cụng trỡnh nghiờn cu ca riờng tụi Cỏc kt qu nờu lun ỏn l trung thc v cha tng cụng b bt k mt cụng trỡnh no Tỏc gi Quang Trung ii Footer Page of 258 Header Page of 258 MC LC LI CM N i LI CAM OAN ii DANH MC CC Kí HIU V CH VIT TT vi DANH MC BNG BIU viii DANH MC HèNH V viii M U CHNG TNG QUAN V CC CU TRC NANO TINH TH MT CHIU ZnS, ZnO V CC CU TRC NANO D TH MT CHIU ZnS/ZnO 1.1 C S Lí THUYT 1.1.1 Gii thiu 1.1.1.1 Vt liu nano 1.1.1.2 Hiu ng giam gi lng t 1.1.1.3 Hiu ng b mt 1.1.2 Cỏc cu trỳc nano mt chiu 10 1.1.2.1 Gii thiu 10 1.1.2.2 C ch hỡnh thnh cỏc cu trỳc nano 1D t pha hi 11 1.1.3 Cỏc cu trỳc nano d th mt chiu 15 1.2 CC CU TRC NANO TINH TH MT CHIU ZnS, ZnO 16 1.2.1 Cỏc cu trỳc nano tinh th mt chiu ZnS 16 1.2.1.1 Tng hp cỏc cu trỳc nano mt chiu ca ZnS 16 1.2.1.2 Tớnh cht quang ca cỏc cu trỳc nano mt chiu ZnS 20 1.2.2 Cỏc cu trỳc nano tinh th mt chiu ZnO 26 1.2.2.1 Hỡnh thỏi cu trỳc ca cỏc nano tinh th mt chiu ZnO 26 1.2.2.2 Tớnh cht quang 27 1.3 CC CU TRC NANO D TH MT CHIU ZnS/ZnO 33 1.3.1 Cỏc cu trỳc nano phc 33 1.3.2 Cỏc cu trỳc nano d th ng trc (lừi /v) 33 1.3.3 Tớnh cht quang ca cỏc cu trỳc nano d th mt chiu ZnS/ZnO 37 1.4 CC PHNG PHP KHO ST CC THUC TNH CU TRC V TNH CHT CA VT LIU SAU CH TO 38 iii Footer Page of 258 Header Page of 258 CHNG NGHIấN CU S HèNH THNH CU TRC NANO MT CHIU ZnS/ZnO T CC CU TRC NANO MT CHIU ZnS BNG PHNG PHP BC BAY NHIT KT HP VI ễXY HểA NHIT TRONG MễI TRNG KHễNG KH Túm tt 41 2.1 GII THIU 42 2.2 THC NGHIM 42 2.3 KT QU V THO LUN 45 2.3.1 ỏnh giỏ cỏc tớnh cht ca dõy nano ZnS ch to c bng phng phỏp bc bay nhit 45 2.3.2 Nghiờn cu quỏ trỡnh chuyn pha ZnSZnO mụi trng khụng khớ 47 2.4 KT LUN CHNG 58 CHNG S HèNH THNH CU TRC NANO D TH ZnS/ZnO MT CHIU T CC CU TRC NANO MT CHIU ZnS BNG PHNG PHP BC BAY NHIT KT HP VI ễXY HểA NHIT TRONG MễI TRNG KH ễXY TRONG KHI NUễI V SAU KHI NUễI 60 Túm tt 60 3.1 GII THIU 61 3.2 THC NGHIM 64 3.3 KT QU V THO LUN 65 3.3.1 S hỡnh thnh cỏc cu trỳc nano mt chiu ZnS bng phng phỏp bc bay nhit bt ZnS lờn trờn Si/Au theo c ch hi - lng - rn (VLS) 65 3.3.1.1 Hỡnh thỏi b mt v cỏc c tớnh cu trỳc ca cỏc nano tinh th mt chiu ZnS nhn c sau nuụi 65 3.3.1.2 Tớnh cht quang ca dõy nano, nano ZnS nhn c sau nuụi 67 3.3.2 Cỏc cu trỳc nano d th mt chiu ZnS/ZnO v quỏ trỡnh chuyn pha ZnS ZnO bng phng phỏp ụxy húa nhit mụi trng khớ ụxy sau nuụi v nuụi 74 3.3.2.1 Nghiờn cu quỏ trỡnh chuyn pha ZnS ZnO bng phng phỏp ụxy húa nhit nuụi 74 3.3.2.2 Nghiờn cu quỏ trỡnh chuyn pha ZnS ZnO bng phng phỏp ụxy húa nhit sau nuụi mụi trng khớ ụxy 79 3.4 KT LUN CHNG 84 iv Footer Page of 258 Header Page of 258 CHNG NGHIấN CU S HèNH THNH CU TRC NANO MT CHIU ZnS/ZnO BNG PHNG PHP BC BAY NHIT THEO C CH HI - RN V QU TRèNH CHUYN PHA ZnSZnO BNG PHNG PHP ễXY HểA NHIT 85 Túm tt 85 4.1 GII THIU 86 4.2 THC NGHIM 87 4.3 KT QU V THO LUN 88 4.3.1 Cỏc cu trỳc nano mt chiu ZnS nhn c sau nuụi bng phng phỏp bc bay nhit theo c ch VS 88 4.3.2 Nghiờn cu quỏ trỡnh chuyn pha ZnSZnO mụi trng khụng khớ v ngun ngc ca nh phỏt x mu xanh lc (green)trong cỏc cu trỳc mt chiu ZnS 93 4.3.3 Nghiờn cu cỏc cu trỳc nano d th mt chiu ZnS/ZnO v quỏ trỡnh chuyn pha ZnS ZnO bng phng phỏp ụxy húa nhit sau nuụi mụi trng khớ ụxy 100 4.4 KT LUN CHNG 107 CHNG CH TO V TNH CHT QUANG CA CC CU TRC NANO MT CHIU ZnS, ZnS/ZnO PHA TP Mn2+ 109 Túm tt 109 5.1 GII THIU 110 5.2 THC NGHIM 111 5.2.1 Ch to cỏc cu trỳc mt chiu ZnS pha Mn sau nuụi 112 5.2.2 Ch to cỏc cu trỳc mt chiu ZnS pha Mn bng cỏch bc bay ng thi ZnS v MnCl2 112 5.3 KT QU V THO LUN 114 5.3.1 Cỏc cu trỳc nano mt chiu ZnS:Mn2+ ch to bng phng phỏp bc bay nhit kt hp vi khuch tỏn nhit mụi trng khớ Ar 114 5.3.2 Kho sỏt cu trỳc, tớnh cht quang ca cỏc cu trỳc nano mt chiu ZnS pha Mn2+ bng phng phỏp bc bay nhit ng thi ngun vt liu ZnS v MnCl2 120 5.4 KT LUN CHNG 127 KT LUN LUN N 129 DANH MC CC CễNG TRèNH CễNG B CA LUN N 131 TI LIU THAM KHO 132 v Footer Page of 258 Header Page of 258 DANH MC CC Kí HIU V CH VIT TT Ký hiu aB D3, D2, D1, D0 E Ec ED, EA Eexc Eg() Eg(NPs) Ep Ev EW f I (h) Kx, Ky, Kz me mh U(0) E , exc, em Ch vit tt A CB CNT CRT CVD D DA, DD EDX Tờn ting Anh Bohr exciton radius Density of states Bỏn kớnh Bohr exciton Mt trng thỏi ca vt rn 3, 2, v chiu Energy Nng lng Conduction band edge Nng lng ỏy vựng dn Energy of donor and acceptor Nng lng ca mc ono, acepto level Energy of exciton Nng lng exciton Bandgap of bulk semiconductor Nng lng vựng cm bỏn dn Bandgap energy of a Nng lng vựng cm ca ht nano nanoparticles Energy of photon Nng lng photon Valence band edge Nng lng nh vựng húa tr Energy of electron in a potential Nng lng ca in t ging well th Exciton oscillator strength Lc dao ng exciton Intensity of luminescence Cng hunh quang Wave vector Vect súng trờn trc x, y, z Effective mass of electron Khi lng hiu dng ca in t Effective mass of hole Khi lng hiu dng ca l trng Overlap factor between H s chng chp ca hm súng in eclectron and hole wave t v l trng functions Absorption coefficient H s hp th Transition energy Nng lng chuyn tip Wavelength, Excitation and Bc súng, bc súng kớch thớch v emission Wavelength phỏt x Transition dipole moment Mụment lng cc chuyn tip Frequency Tn s Tờn ting Anh Acceptor Conduction band Carbon nano-tubes Cathode ray tube Chemical vapor deposition Donor Deep Acceptor, Deep Donor Energy dispersive x-ray vi Footer Page of 258 Tờn ting Vit Tờn ting Vit Acepto Vựng dn ng nano cacbon ễng tia catt Lng ng pha hi húa hc ono Acepto sõu, ono sõu Ph tỏn sc nng lng tia x Header Page of 258 FCC FESEM GB GO HOMO LO LUMO NBE PL CL PLE RE RT TEM TM TO VB VLS VS XRD spectroscopy Face center cubic Field emission scanning electron microscopy Green-Blue Green-Orange Highest occupied molecular orbital Longitude optical Lowest unoccupied molecular orbital Near Band Edge emission Photoluminescence spectrum Cathodoluminescence Photoluminescence excitation spectrum Rare Earth Room temperature Transmission electron microscope Transition metal Transverse optical Valence band Vapor liquid solid Vapor solid X-ray Diffraction vii Footer Page of 258 Lp phng tõm mt Hin vi in t quột phỏt x trng Xanh lc-Xanh lam Xanh lc- Cam Qu o phõn t b chim cao nht Phonon quang dc Qu o phõn t khụng b chim thp nht Phỏt x b vựng Ph hunh quang Ph hunh quang catt Ph kớch thớch hunh quang t him Nhit phũng Hin vi in t truyn qua Kim loi chuyn tip Phonon quang ngang Vựng húa tr Hi-lng-rn Hi-rn Nhiu x tia x Header Page of 258 DANH MC BNG BIU Bng 1.1 S liờn quan gia kớch thc v s nguyờn t ti b mt Bng 1.2 Bng thng kờ cỏc cụng ngh ch to cỏc cu trỳc dõy/thanh nano ZnS, vựng nhit phn ng v cỏc ti liu tham kho tng ng 17 Bng 1.3 Bng thng kờ cỏc phng phỏp ch to cỏc cu trỳc nano ZnS dng ai, bng, v tm nano, nhit phn ng v cỏc ti liu tham kho tng ng 20 Bng 1.4 Bng thng k mt s phng phỏp thc nghim tớnh cht quang ca vt liu theo cỏc c ch kớch thớch khỏc 20 Bng 1.5 Bng tng hp mt s thụng tin v tớnh cht hunh quang ca cỏc cu trỳc nano mt chiu ZnS v cỏc ti liu tham kho tng ng 24 Bng 1.6 Cỏc tớnh cht hunh quang catt ca cỏc cu trỳc nano ZnS mt chiu 26 Bng 1.7 V trớ v ngun gc xut ca cỏc phỏt x liờn kt exciton ZnO (ti nhit thp) 29 Bng 1.8 V trớ v ngun gc ca cỏc phỏt x hunh quang ti nhit phũng ZnO v cỏc ti liu tham kho tng ng 32 Bng 1.9 Cỏc phng phỏp ch to cỏc cu trỳc mt chiu ng trc lừi v v ZnS v ti liu tham kho tng ng 36 Bng 1.10 Cỏc phng phỏp ch to cỏc cu trỳc d th mt chiu cnh - cnh ca ZnS (ZnS-side-by-side heterostructures) 37 Bng 3.1 Mt s tớnh cht vt lý c bn ca ZnS v ZnO 61 DANH MC HèNH V Hỡnh 1.1 Cỏc loi vt liu nano: (0D) ht nano hỡnh cu, cm nano; (1D) dõy, nano; (2D) mng, a v li nano; (3D) vt liu Hỡnh 1.2 Mt trng thỏi ca nano tinh th bỏn dn Mt trng thỏi b giỏn on vựng b Khong cỏch HOMO-LUMO gia tng nano tinh th bỏn dn kớch thc nh i Hỡnh 1.3 S minh hỡnh thỏi khỏc cu trỳc nano 1D v cỏc thut ng thng c s dng mụ t chỳng: (a) dõy nano (NWS), dõy hoc si nano, (b) nano (NRs); (c) (NBS) hoc di nano v (d) cỏc ng nano (NT) 10 Hỡnh 1.4 Gin minh quỏ trỡnh mc dõy Si t gin pha nh git hp kim xỳc tỏc Au-Si (a) Git hp kim Au-Si hỡnh thnh trờn Si úng vai trũ xỳc tỏc mc dõy; (b) Gin pha ca Au-Si; (c) quỏ trỡnh khuch tỏn v hỡnh thnh dõy nano ca vt liu ngun qua git lng 12 Hỡnh 1.5 Cỏc mụ hỡnh khuch tỏn khỏc cho cỏc nguyờn t vt liu ngun kt hp quỏ trỡnh mc dõy nano ban u: (a) C ch VLS c in; (b) Git hp kim lng trng thỏi núng chy mt phn, b mt v giao din ca nú trng thỏi lng bờn lừi trng thỏi rn; (c) Kim loi xỳc tỏc trng thỏi rn nhng b mt giao din trng thỏi lng 13 Hỡnh 1.6 S mụ hỡnh minh quỏ trỡnh mc ca (a) dõy nano v (b) nano ZnO 14 viii Footer Page of 258 Header Page of 258 Hỡnh 1.7 (a) Mc d hng t ZnO tinh th; (b) Mc d hng ca tinh th ZnO lch xon; (c) Mc song tinh; (d) Mc dõy nano ZnO t xỳc tỏc bng git lng Zn; (e) Dõy nano tinh th ZnO khụng cha ht xỳc tỏc v khuyt tt; (f) Dõy nano ZnO mc s lch mng; (g) Mc lng tinh th song tinh; (h) Zn hoc pha giu Zn quan sỏt c trờn u mỳt ca dõy nano ZnO 14 Hỡnh 1.8 Cỏc loi cu trỳc d th mt chiu 16 Hỡnh 1.9 Mt s hỡnh thỏi in hỡnh ca cu trỳc nano ZnS mt chiu ó c ch to 16 Hỡnh 1.10 (a) nh SEM ca dõy nano ZnS ch to bng phng phỏp bc bay nhit bt ZnS trờn Si/Au; (b) dõy nano c mc theo c ch VLS t ngun phõn t tin cht v ht xỳc tỏc vng;(c v d) nh HRTEM ca dõy nano ZnS thang o 10 nm 18 Hỡnh 1.11 (a v b) nh SEM ca bng nano ZnS ch to bng phng phỏp bc bay cú s h tr ca khớ hydro; (c v d) nh TEM, ph EDS, v nh HRTEM cỏc bng nano ZnS 19 Hỡnh 1.12 (a) nh SEM v (b) ph PL ca nanoawls ZnS; (c) nh TEM v (d) ph PL ca ZnS nanobelts 21 Hỡnh 1.13 (a-d) nh SEM ca thanh, dõy, v bng nano ZnS hỡnh thnh bn vựng nhit khỏc nhau, tng ng; (e) ph hunh quang ca cỏc cu trỳc nano ZnS22 Hỡnh 1.14 (a) nh TEM v HRTEM ca dõy nano ZnS; (b) ph PL ca dõy nano ZnS o ti RT v c kớch thớch bi ngun laser xung (266 nm); (c) nh SEM v TEM ca dõy nano cp tun hon ZnS; (d) ph PL ti RT ca bt nano ZnS v dõy nano cp tun hon ZnS 23 Hỡnh 1.15 (a) nh TEM, (b) nh HRTEM, (c) gin SEAD ca cỏc nano ZnS, (d) Mụ hỡnh cu trỳc mt nano; (e) nh SEM ca mt nano ZnS v (f) nh ph CL; (g) ph CL ghi li t nano ZnS nhỡn thy hỡnh nh SEM (e), (h) ph CL c chp li ti cỏc im khỏc trờn nano dc theo ng ỏnh du (e) 25 Hỡnh 1.16 Cỏc cu trỳc nano ZnO c tng hp cỏc iu kin cú kim soỏt bng phng phỏp bc bay nhit 26 Hỡnh 1.17 S hỡnh thnh cỏc hỡnh thỏi ca ZnO, cho thy mt ca cỏc n tinh th 27 Hỡnh 1.18 nh SEM ca mt dõy nano ZnO 27 Hỡnh 1.19 (a) Ph PL gn b vựng (NBE) ca mt dõy nano ZnO o 10K; (b) Ph PL NBE ph thuc vo nhit ; (c) V trớ cỏc nh ph phỏt x ca cỏc exciton t ph thuc vo nhit , ng nột lin l ng fit theo hm Varshni 27 Hỡnh 1.20 Ph hunh quang ph thuc vo nhit ca mt dõy nano ZnO 29 Hỡnh 1.21 Gin phỏt x vựng UV v ba nh phỏt x vựng nhỡn thy 29 Hỡnh 1.22 Phỏc tho vựng nng lng ca cỏc dõy nano ZnO vi ba loi vựng nghốo b mt khỏc nhau: (a) dõy nano b lm nghốo hon ton, ch cũn li cỏc tõm VO + v VO ++ dõy nano; (b) dõy nano mt phn cn kit Tõm VO ++cú th tn ti vựng nghốo, v VO + v VO x cú th tn ti vựng khụng nghốo; (c) dõy nano vi nng in t cao cú mt b mt nghốo vi rng nh Ch tõm VO ++ tn ti vựng nghốo Nng ht ti ln lm cho mc Fermi cao hn ix Footer Page of 258 Header Page 10 of 258 mc VO + v tt c cỏc VO + c lp y v ch cú tõm VOx tn ti vựng khụng nghốo 31 Hỡnh 1.23 Hỡnh minh s ghộp ni ca cỏc cu trỳc nano mt chiu ZnS riờng l cỏc cu trỳc nano phc 33 Hỡnh 1.24 (a v b) nh SEM, (c) nh TEM v (d) nh HRTEM ca BN c ph ZnS nanoarchitectures, Vớ d: cu trỳc nano lừi/v ZnS/BN 33 Hỡnh 1.25 nh TEM ca nano ZnO (a) trc v (b) sau phn ng vi H2S, cho thy s hỡnh thnh ca ZnO/ZnS cu trỳc nano lừi/v; (c) ZnO/ZnS nanocable vi lp v ZnS b hng v (d) gin SAED tng ng ghi li t v trớ ny, cho thy s hin din ca mt lừi n tinh th ZnO v ZnS v cu trỳc nano; (e, f) ph EDS thu c t cỏc vựng ch nh (c) 34 Hỡnh 1.26 (a-c) nh TEM c trng ca hai cu trỳc d th mi nano hai trc ZnS/ZnO; (d-f) nh HRTEM c ghi nhn t cnh ZnO, cnh ZnS v mt tip giỏp ca nano d th tinh th ZnS/n tinh th ZnO; (g, h) mụ hỡnh cu ca cỏc mt tip giỏp ca WZ-ZnS/ZnO v ZB-ZnS/ZnO c ỏnh du bng ''I1'' v "I2" hỡnh (f) 37 Hỡnh 1.27 Ph hunh quang ca cu trỳc d th ZnS/ZnO 38 Hỡnh 1.28 Ph hunh quang ca cu trỳc d th ZnS/ZnO o nhit thp (30 K) 38 Hỡnh 1.29 nh thit b o nh FESEM c tớch hp vi u o EDS v ph CL 38 Hỡnh 1.30 H o h o ph hunh quang, kớch thớch hunh quang (NanoLog spectrofluorometer, HORIBA Jobin Yvon) 40 Hỡnh 1.31 nh u o CL c tớch hp thit b o FESEM JEOL/JSM-7600F (a) v s nguyờn lý ca thit b o (b) 40 Hỡnh 2.1 S ch to cỏc cu trỳc 1D ZnS v ZnS/ZnO bng phng phỏp bc bay nhit v ụxy húa nhit mụi trng khụng khớ 43 Hỡnh 2.2 S h lũ ng nm ngang (a); quy trỡnh thc nghim ch to cỏc cu trỳc nano tinh th ZnS mt chiu bng phng phỏp bc bay nhit theo c ch VLS (b); H bc bay nhit thc t (c) 44 Hỡnh 2.3 nh FESEM ca dõy nano ZnS nhn c sau nuụi bng phng phỏp bc bay nhit 45 Hỡnh 2.4 Ph nhiu x tia X ca dõy nano ZnS nhn c sau nuụi 46 Hỡnh 2.5 Ph hunh quang c kớch thớch bi bc súng 325 nm v ph kớch thớch hunh quang ca dõy nano ZnS nhn c sau nuụi o ti bc súng 512 nm46 Hỡnh 2.6 nh FESEM ca dõy nano ZnS nhn c sau nuụi trờn Si ph kim loi xỳc tỏc vng (a) v cỏc mu c ụxy húa sau nuụi mụi trng khụng khớ ti cỏc nhit khỏc nhau: (b) 300 C; (c) 500 C; (d) 700 C 48 Hỡnh 2.7 nh TEM ca dõy nano ZnS/ZnO nhn c sau ụxy húa dõy nano ZnS ti nhit (a) 300 oC; (b) 500 oC; (d) 700 oC 48 Hỡnh 2.8 Ph nhiu x tia X ca dõy nano ZnS/ZnO sau ó ụxy húa khụng khớ nhit 400, 600 v 800 oC thi gian gi 49 Hỡnh 2.9 Ph hunh quang ca dõy nano ZnS v dõy nano ZnS ụxy húa khụng khớ nhit 400, 600 oC nhn c kớch thớch mu bng laser He-Cd bc súng 325 nm nhit phũng 50 x Footer Page 10 of 258 Header Page 146 of 258 DANH MC CC CễNG TRèNH CễNG B CA LUN N 1) Quang Trung, Phm Thnh Huy, Nguyn c Trung Kiờn, Võn Nam, Lờ Anh Tun, Nguyn Thnh Huy, CH TO V TNH CHT QUANG CA CU TRC NANO MT CHIU ZnS/ZnO Hi ngh Vt lý cht rn v Khoa hc vt liu ton quc ln th (SPMS-2009) - Nng 8-10/11/2009, Tr 313-317 2) V Nam Do, N.T Tuan, D.Q Trung, N.D.T Kien, N.D Chien, P.T Huy, "Onedimensional protuberant optically active ZnO structure fabricated by oxidizing ZnS nanowires Materials Letters, Vol 64, pp 1650 1652 (2010) (SCI IF 2.2) 3) Do Quang Trung, Pham Thanh Huy, Nguyen Duy Hung, Nguyen Tu, Le Thi Thu Huong, Trinh Xuan Anh, and Tran Ngoc 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TRÚC NANO TINH THỂ MỘT CHIỀU ZnS, ZnO 16 1.2.1 Các cấu trúc nano tinh thể chiều ZnS 16 1.2.1.1 Tổng hợp cấu trúc nano chiều ZnS 16 1.2.1.2 Tính chất quang cấu trúc nano chiều ZnS. .. 1.2.2 Các cấu trúc nano tinh thể chiều ZnO 26 1.2.2.1 Hình thái cấu trúc nano tinh thể chiều ZnO 26 1.2.2.2 Tính chất quang 27 1.3 CÁC CẤU TRÚC NANO DỊ THỂ MỘT CHIỀU ZnS/ ZnO