CHE TAO BANG PHUONG PHAP SOL-GEL

- Quang pho toan quoc lan thu III Nha Trang 1115/8/2002.

CHE TAO BANG PHUONG PHAP SOL-GEL

KHOA LUAN TOT NGHIEP HE DAI HOC CHINH QUY

Nganh : Khoa hoc Vat lieu

Can bo huong dan :PGS .TS Nguyln Thi Thiic Hien

Can bo phan bien: TS. Le Thi Thanh Binh

MUC LUC

.. Trang

M 6 DAU 1

Chuong 1: Tong quan ve li thuyet chat ban dan ZnO 3

1.1. Mot so tinh chat chung ciia ban d^n ZnO 3

1.2. Cau triic luc giac wurzite cua ZnO 3 1.3. Cau triic vung nang lugng ciia ZnO 4 1.3. Cau triic vung nang lugng ciia ZnO 4 1.4. Mot so tinh chat quang cua ZnO 6

1.4.1. Tinh chat hap ihu ciia ban dan 6 1.4.2. Tfnh chai quang huynh quang cua ban dan 7

1.4.3. Tai hop biTc xa qua cac trang thai excilon 8

1.4.4. Tfnh chat huynh quang cua ZnO 12

1.5. Cac hieu iing bien hat (grain boundary) 13

1.6. iTng dung ciia ban dan ZnO 13

Chuong 2: Mgi so phuong phap che lao mang ban dan 15

2.1. Phuong phiip boc bay trong chan khong 15 2.2. Phuang phap phun dung dich tren de nong 15 2.2. Phuang phap phun dung dich tren de nong 15

2.3. Phuang phap phun tinh dien 16 2.4. Phuong phap phiin xa katot (sputtering) 16 2.4. Phuong phap phiin xa katot (sputtering) 16

2.5. Phuong phap Sol-gel 16

2..S.Ị Gioi Ihicu chung 16

2.5.2. Cac khai nicin ca ban i7

2.3.3. Hoa hoc alkoxide ^8 2.5.4. Uu diem va nhugc diem cua phuong phiip sol-gel 18

2.5.5. Qui trinh tao mang mong bang phuang phap sol-gel 19

2.5.5.1. Phuang phap nhung ^^ 2.5.5.2. Phuang phap thao dung dich, quay li tam. phun 21

2.5.5.3. Cong doan say kho ^^ 2.5.5.4. Cong doan xu If nhiet va hoa rdn 21

Chuang 3: Kl thuat thirc nghiem 22

3.1. Hoa chat, dung cu va thiet bi thi nghiem 22

3.2. Lo u nhiet 23

}.ị Cac phep do va he do khac 23

Chuang 4: Ket qua thirc nghiem va thao luan 24

4.1. Qui trinh tao mang mong ZnO b;lng phuang phap sol-gel 24

4.1.1. Qui lrinh lao sol 24

4.1.2. Kcl qua do phan tfch nhiet vi sai 24 4.1.3. Tao mang ZnO bang phuang phap nhiing sol-gel 25

4.2. Hinh thai be mat va chieu day ciia mang ZnO 28

4.3.Tinh chat cau tnic cua mang ZnO 31

4.3.1. Pho nhieu xa tia X ciia cac mang tao bai hai kT thuat chong lop 31

4.3.2. Pho nhiSu xa tia X ciia mang vai so lap ch6ng khac nhau 33

4.4. Cac tinh chat quang huynh quang 33

4.4.1. Pho huynh quang ciia mang vai so lap khac nhau 33 4.4.2. Pho huynh quang ciia mang lao bai hai kl thuat chong lap 34

4.4.3. Pho huynh quang ciia mang u hydro 35 4.4.4. Ph6 huynh quang cua mang li oxi 35 4.4.5. Ph6 huynh quang ciia mau dugc an mon axit 37

4.4.6. Pho huynh quang a vung nhiet do thap 37

4.5. Pho truyen qua cua mang co so lop khac nhau 39