PHẦN III: Các Kết quả và biện luận

Phan 3: Cac ket qua va bien luan

Ph6 nhieu xa X-ray ciia cac mSu khoi Zn,.^PxO dupe nung a 750 "C dupe dua

ra tren hinh 1. Tinh chaft ca'u triic va cac thong so mang ciia vat lieu dupe xac dinh

bang chuong trinh Ritveld [6]. Hang s6' mang a va c dupe xac dinh c6 cac gia tri

sau: a = b = 3.756 A, c = 5.028 A. Nhin vao hinh ve la tha'y, khi thanh phan phospo

nho (x = 0.00 de'n 0.06), thi hSu het ta't ca cac dinh phd deu la cac phd thupc pha

ZnO vi the' khi do cac miu la don pha. Khi thanh phin x tang, pha Zn3(P04)2 xuat

hien nhung v6i ty le ve cucmg dp so vori dinh chinh ciia ZnO la kha nho nen mau

vin kha don pha. Tit ca cac dinh (002) ciia he mSu Znj.^PxO (a vi tri goc 20 = 37")

deu dich ve phi goc nho so v6i dinh (002) ciia miu khong pha tap.

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Hinh 1: Pho nhiSu xa tia X ciia he miu khoi Zn, ,P,0

Anh SEM ciia he miu khoi Zni.xP^O dupe nung 6 750 "C dupe chi ra tren

hinh 2. Ta't ca cac miu deu c6 ca'u true hat v6i kich thudc ca hang tram nano met

v6i mat d6 xep chat kha cao dieu do cho tha'y a nhiet dp nung nay thanh phan pha

ZnO da hinh thanh. Khi tang nhiet dp thieu ket cua he miu len 900 "C, 1100 "C thi

mat dp hat cung tang len. Hing so Hall ciia hai mSu khoi vai thanh phan x = 0.03

va 0.06 cho ke't qua duong. Dieu do cho thiy miu la ban din loai p a nhiet dp 300

K v6i nong dp 16 trong 10'** cm \



b) X = 0.06



c)x = 0.09

d)x = 0.12

Hinh 2. anh SEM cua mSu khoi Zn,.,P,0 nung a 750 "C.

Ph6 EDS cua ta't ca cac miu khoi deu dupe do. Hinh 3 dua ra pho EDS cua

thanh phin mlu x = 0.06. Nhin vao ket qua ta thay tren pho chi xuat hien cac dinh

ciia cac nguyen to thanh phan Zn, P va O chii khong he c6 thanh phan tap chat

khac. Dieu do cho tha'y P da dupe vao trong phan mang.



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Hinh 3: Ph6 EDS ciia miu khoi Zno^jPoti^O



Trudc khi thuc hien b6'c bay cac mang Znj.^PxO, cac tinh chat nhiet TA, DTG

ciia cic miu dupe nghien curu mot each ty mi. Hinh 4, 5, 6 va 7 la do thi TA, DTG

ciia lin lupl cac miu v6i cac thanh phin x = 0,03; 0,06; 0,09 va 0,12.

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Hinh 5: Gian do phan tich TA, DTG ciia mlu Zn^^^^^V^^^^O



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Hinh 6: Gian do phan tich TA, DTG cua mlu ZnoyiPoo^O.



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Hinh 7: Gian do phan tich TA, DTG cua mlu Zno^xPf, 12O.



Tur cac gian do phan tich nhiet tren ta tha'y hau het vai cac mlu a nhiet dp

gin 1000 "C thi pha ZnO dupe tao thanh con a vung nhiet dp thap su giam khoi

lupng la do sir bay hai cua nguyen to Phospho. Vi the khi boc bay de tao mang

chiing I6i da dat nguon nhiet la 1100 "C de a nhiet dp do dam bao la vat lieu dupe

bay hai m6l each hoan toan.



Khi nghien curu anh SEM cua cac miu mang chiing ta thay cau iriic cua cac

miu mang hoan toan khac so v6i cac miu khoi vi tinh chat cau true ciia cac mlu

phu thupc rat nhieu vao dieu kien cong nghe. Khi nhiet dp trong 16 duoi 1100 "C,

anh SEM cua cac miu la ca'u triic hat. Hinh 8 dua ra anh SEM ciia cac mlu mang

Zni.^P.O (x = 0.03 va 0.06) dupe boc bay khi nhiet dp nguon nhiet la 1100 "C,

th5i gian giu nhiet la 30 phiit, nhiet dp de la 600 "C vk 700 "C



a) X = 0.03, T,ub. = 600 "C



b) X = 0.03, T,,b. = 700 *'C



e) X = 0.06, T,,b. = 600 '^C

d) x = 0.06, T.^. = 700 "C

Hinh 8: anh SEM cua cac mlu mang Zn,.,P,0 (x = 0.03 va 0.06) khi T = 1100 "C.

Tir ket qua tren hinh 8 ta thay, ca'u true nano da dupe tao ra vai kich thudc tir

10 nm de'n 20 nm vai ca hai mlu khi nhiet dp de la T.^b = 600 "C. Khi nhiet dp de

tang, kich thu6c ciia cac day nano cung tang len (hinh 8d). Ket qua nay khing dinh

ring ca'u true tinh the ciia he vai lieu nay phu thupc rat nhieu vao dieu kien cong

nghe

Ph6 huynh quang cua cac miu mang Zn^,J^fi dupe do duai bude song kich thich

325 nm dupe dua ra tren hinh 9. Tat ca cac pho deu bao g6m 2 dinh ling vai bu6e

song 390 nm trong vting UV va 509 nm trong vung anh sang xanh.



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Hinh 9: ph6 huynh quang ciia mlu mang Zni.^P^O tai at 300 K, buac song ciia anh

sang kich thich X^^^. = 325 nm

4. Ket luan.

Chung loi da thanh cong trong viec che tao ban din ZnO pha tap P loai p.

Cac tinh cha't ca'u true va tinh cha't quang cua ta't ca cac miu deu dupe nghien cuu

mot each chi tiet. Cac day nano ciia he vat lieu nay c6 kich thu6e tir lOnm den 20

nm va chieu dai ca micro met. Ph6 huynh quang ciia tat ca cac miu bao gom hai

dinh C bu6c song 390 nm va 509 nm trong viing UV va viing anh sang xanh tuong

O

umg.

5. Tai lieu tham khao:

[1] J.G.Lu, S.Fujita, T.Kawaharamura, H.Nishinaka, Roles of hydrogen and

nitrogen in p-type doping of ZnO, Chemical Physics Letters 441 (2007) 68 71.

[2] Xiaodan Zhang, Hongbing Fan, Jian Sun, Ying Zhao, Structural and

electrical properties of p-type ZnO films prepared by Ultrasonic Spray

Pyrolysis, Thin Solid Films 515 (2007) 8789- 8792.

[3] Z.G.Yu, P.Wu, H.Gong, Theoretical and experimental studies on oxygen

vacancy in p-type ZnO, Physica B 401 - 402 (2007) 417 -420.

[4] J.C.Fan, Z.Xie, Q.Wan, Y.G.Wang, As-doped p-type ZnO films prepared by

cosputtering ZnO and Zn^Asi targets. Journal of Crystal Growlh 307 (2007) 66

-69.

[5] T.H. Vlasenflin, M. Tanaka, p-type conduction in ZnO dual-acceptor-doped

with nitrogen and phosphorus. Solid State Communications 142 (2007) 292294

[6] F. Izumi and T Ikeda. Mater. Sci. Forum 321-324 (2000) 198.



Tom tdt cac cong trinh NCKH cua ca nhan

Nganh : Vat ly ; Chuyen nganh: Khoa hoc Vat lieu

1. Ho va len (cac) lac gia cong trinh: Ngo Thu Huong

2. Nam: 2008

3. Ten bai bao:

" Tmh chat ca'u Iriic va linh chat quang cua he vat lieu Zn,.^P,0"

4. Ten Tap chi/Sach/Tuyen tap Hoi nghi. So, trang: Tap chi khoa hoc Toan Vai ly Dai hoc Qu6'c gia Ha noi, Volum 24, so IS, trang 166 - 169.

5. Tom lit cong trinh bing lieng Viet:

"Cac miu ZnO pha tap phospho khoi va mang dirac tao bing hai phuong

phap gom va phtrong phap boc bay nhiet. Tinh chal ca'u true va tinh chat

quang cua he vat lieu Zn^.^P^O nay da dupe khao sat. Pho X-ray chi ra ring

dinh (002) dich ve phia goc nho. Cau triic nano Ihu dirpc bing viec dieu

khien ly le khi, nhiet do nguon va nhiet do de. Cac day nano cua he vat lieu

nay c6 dp Idn cQ 10 nm va dai khoang vai micromel".

6. Tieng Anh

Author: Ngo Thu Huong

Year: 2008

Title:"The crystal structure and optical properties of the Zn|.^P^O

compounds "

VNU Journal of Science Mathematics - Physics 24, No IS (2008) 166 - 169.

Abstract: "Phosphours (P) doped ZnO bulk and thin film were grown by

both ceramic and thermal evaporation methods. Crystal structure and optical

properties of the Zn,.^P^O compounds were investigated. The X-ray

diffraction showed that the ZnO (002) peak shifted to lower angle. The nanostructure was archived by control the gas ratio, heating temperature and

substrate temperature. The nanowires of these compounds is about 10 nm in

size and some micrometers in the length for thin films".



Truong Dai hoc Khoa hoe Tu nhien

Khoa Vat ly



Xac nhan hu'ang dan tham gia nghien ciru khoa hoc

thuoc de tai cac cap DHQGHN

Ban ehii nhiem Khoa Vat ly xac nhan sinh vien Chu Thi Thu K50

tham gia nghien cuu khoa hoc tir thing 4/2008 duoi su huong dan ciia Tien

sT Ngo Thu Huong voi de tai: Nghien emi sir anh huong ciia che dp cong

nghe den su hinh thanh cau true nano eiia vat lieu ZnO pha tap phospho.

Hd noi, ngdy 2 thang 2 nam 2009



Chii nhiem Khoa Vat ly



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JO!

TRUONt; HAi il()(^ KHOA IKK 1IJ NIIIKN



CONG IIOA XA HOI CUV NGIIIA VlIT NAM

IhW l;ip - tu do - ilaiih pluic



'



lid Noi, ngdy OS'thdng ^ nam 2007



QUYHTDINII CUA IIIHU TRIJ('5NG TRlXM} DA! HOC KHOA HOC ll/NHIHN

V/v: c6ng nhan d6 tai luan an tien sT va can bp huong din nghien cuu sinh nam 2006



HIEU TRUdNG TRUING DAI HOC KHOA HOC TU NHIEN

- Can ci( Quy dinh ve to chi'tc vd hoat dpng trong Dai hoc Quoc gia Hd Noi

dim- ban hdnh theo Quyet dinh sdOOOfrCCB ngdy 01110/2001 ciia Giam doc Dai hoc

Quoc gia Hd Noi;

- Can ci( Quy che Ddo tao sau dai hoc ditgc ban hdnh theo Quyet dinh so

I8/2000/QD-BGD&DT ngdy 081612000 cua Bo trifdng Bp Gido due vd Ddo tao; '

- Can c(( Quy che Ddo tao sau dai hoc a Dai hoc Quoc gia Hd Noi duac ban

hdnh theo Quyet dinh sd 15IDT ngdy 0910212004 cua Giam doc Dai hoc Quoc gia

HdNpi;

- Can ci( cac Quyet dinh sd 22591SDH ngdy 07/12/2006, sd 2376/SDH ngdy

14/12/2006, sd2677/SDH ngdy 29112/2006 cua Giam doc Dai hoc Quoc gia Hd Npi ve

viec cong nhan nghien ci(u sinh nam 2006 ciia trifdng Dai hoc Khoa hoc Tu nhien Dai hoc Quoc gia Hd Npi;

- Theo de nghi ciia cdc ong: Tritdng phong Sau dai hoc, Chu nhiem Khoa Vat ly,

QUYET DINH

Dieu 1: Cong nhan de tai luan an tien si va ngu6i huong din cua nghien curu sinh

Nguyen Viet Tuyen, nhu sau:

Ten de tai:

Che tao va nghien cihi cac tinh chat cua mang mong va

vat lieu cau true nano tren ca so oxit kem pha tap chit va

kha nang utig dung ciia chiing.

Chuyen nganh:

Vat ly chat rin; ma so: 62 44 07 01.

Can bo huofng din: HOC: PGS. TS Ta Dinh Canh, Tru6ng Dai hoc Khoa hoc

Tunhien - DHQGHN;

HDP: TS. Ngo Thu liirong. TrU(tng Dai hoc Khoa hoc Tu

nhien - DHQGHN.

I linh thuc dao tao: Tap trung, 4 nam (2006 - 2010).

Dieu 2: Nguai huofng din nghien cuu sinh c6 nhiem vu va quycn lai ghi tmng

Quy che Dao tao sau dai hoc hien hanh.

Dieu 3: Cac ong (ba): Truang phong Sau dai hoc, Chii nhiem Khoa Vat ly, Thii

truong cac don vi lien quan, nghien cuu sinh va nguai huong din c6 ten trong

Dieu I chju trach nhiem ihi hanh Quyet dinh nay.

U IRUONG

J TRU6NG



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