Chế tạo và khảo sát vật liệu bán dẫn p zno

Muc tieu va noi dung nghien ciru: Che tao vat lieu ban din loai p-ZnO va nghien cuii cac tinh chat cau triic, tinh chat nhiet, dien va quang cua loai vat lieu nay.. Vi the' trong d6 tii

Dai hoc Quoc gia Ha noi

Tniofng Dai hoc Khoa hoc Tit nhien

_ TfeND^TAI: CHf TAO VA K H A O SAT VAT LifiU BAN D A N P-ZnO

M A Sd: QT- 08-11

CHU TRI Di TAI: TS NGO THU HUONG

(KHOA V^T L^)

Ha noi - 2008

Dai hoc Quoc gia Ha noi Trtfcmg Dai hoc Khoa hoc Tii nhien

> v ' V TEN DE TAI:

CHE TAO VA KHAO SAT V A T LIEU BAN D A N P-ZnO

V

M A SO: QT- 08-11

CHU TRI f)t TAI: TS NGO THU HUONG

(KHOA VAT LY)

^'^\;;ic- T,-,t

DT/ qo4

Ha noi - 2008

Dai hoc Quoc gia Ha noi Triiomg Dai hoc Khoa hoc Tii nhien

TEN DE T A I : CHE TAO VA K H A O S A T V A T L I E U B A N D A N P-ZnO

M A SO: QT- 08 -11

CHU TRI DE TAI: TS NGO THU HUONG

CAC CAN B O T H A M GIA:

TSKH NGUYfiN HOA HONG NCS NGUYilN VIET TUYEN SINH VIEN: CHU THI THU

Ha noi - 2008

1 Bao cao torn tat

a Ten de tai : Che tao va khao sal vat lieu ban dSn p-ZnO

( M a s 6 : Q T - 0 8 - l l )

b Chu tri de t a i : TS Ngo Thu Hacmg

c Cac can bo tham gia: TSKH Nguyin Hoa Hong

NCS Nguyin Viet Tuyen Sinh vien: Chu Thi Thu

d Thoi gian thuc hien tuf thang 01 nam 2008 den thang 12 nam 2008

e Muc tieu va noi dung nghien ciru: Che tao vat lieu ban din loai p-ZnO

va nghien cuii cac tinh chat cau triic, tinh chat nhiet, dien va quang cua loai vat lieu nay

f Cac ket qua dat dupe: Ket qua cua di tai bao gom 01 bai bao giri dang tap chi cua Dai hoc quoc gia Ha noi; 01 bai hsioa'^gxxi dang lap chi

nirorc ngoai; tham gia hucfng dSn 01 sinh vien nghien curu khoa hoc, se bao

ve nam 2009; tham gia hudng din 01 nghien cun sinh

g Tinh hinh kinh phi cua d6 tai:

Tong kinh phi ihuc chi: 20.000.000 dong

Trong do - Tir ngan sach nha nu6c: 20.000.000 d6ng

- Vay tin dung: 0

- Von tuco: 0 Khoa quan ly

(Ky va ghi ro ho ten)

Chu tri de tai (Ky va ghi ro ho ten)

2 Brief project report

a Project title: Preparing and studying semiconductor p-type ZnO materials (QT-08 - 11)

b Project co-ordinator: Dr Ngo Thu Huong

c Co-operalor: Dr Nguyen Hoa Hong

Ph.D student Nguyen Viet Tuyen

Student Chu Thi Thu

d Duration: from 2008, January to 2008, December)

e Objectives and scientific contents: The main object of this project is: preparing the p-type ZnO material and studying the structural, electrical and optical properties of this material

f Results: The main results of this work were given in the scientific paper in the VNU Jounal of Science, Mathematics - Physics, 12/2008.; 01 paper to be submit in international journal Supervisor one research student and one Ph.D student

g Budget: 20.000.000 VND

1 Mucluc

Trang T6ng quan v^ vai lieu 6

C4c phuong phip thuc nghifim 10

Cac k6i qua va bien luan 11

K^tluto 16

Tki lieu tham khao 16

Phin 1: T^ng quan ve vat lieu

Viec |Aa tap c4c tap acceptor d^ thu duoc vat heu ban din p - ZnO \k mdt

vSn d6 duoc dat ra cin phai giai quy€t trong viec img dung cdc hnh kien b^n din

nky D^ thu dupe bdn dSn loai p, thu5ng cac nguyen 16' nh6m V nhu N, P, As dupe d&ng nhi^u [1-5] Tuy nhien, nhom nguyen 16' Cu, Ag trong viec thay v^o vi iri Zn

cung thu dupe bdn d ^ loai p Cu dupe diing nhu c^c acceptor 6i thay v^o vi tri ciia

Zn v) bin kinh cua ion Qi^ la 0,098 nm va Cu^^ la 0,080 nm la gin nhu tuong

duong vdi bdn kinh ciia ion Zn^^ (0,083 nm) Viec c^c nguyen l6 Ihupc nh6m V Ihay the' Zn anh hucmg ro ret len cdc tinh ch^t dien v^ quang cua vat lieu bin din

Vi the' trong d6 tii niy chung t6i nghien cihi su anh hudng cua phospho len cac

tinh cha^t ciu true cua vat lieu bdn din loai p-ZnO

1.1 Tinh chit can true cua vat lieu ZnO

Til ca cic vai lieu thu6c nh6m II-VI d^u c6 du true cubic hoac du true luc

giic Wurtzite Vat lieu ZnO Ihucmg t6n lai m6t trong ba dang nhu dupe chi ra iren

hinh I

Rocksah(Bl) Zinc blende (B3) Wurtzite (B4)

Hinh 1; Qfu true ciia ZnO: (a) dang cubic rocksalt, (b) dang Zinc blende

v^ (c) dang Wutzite

12 Ciu true vdng ndng liromg cua vat lieu ZnO:

Hinh 2 chi ra ph6 phit xa cua nang lupng photon trong dai lijr 20 de'n 50 eV

vi cic th6ng sd ciia khd'i ciu true vung nang lupng ciia vai heu ZnO Trong cac ph^p do niy, cic b6 nang lupng lien quan tdi mirc nang lupng Fermi va cu5ng dp thdng qua th6ng lupng cua photon

E,=0

(a)

12 6 4 0 12 6 4

Binding energy (eV)

Hmh 2: (a) ph6 phat xa cua nSng lupng photon dai lir 20-50 eV (b)

C^u true vilng cua ZnO

Hinh 3 la c^u true vung nang lupng theo tinh loan ly thuye't va t6ng cac mat

dp Irang Ih^ (DOS) vdfi cdc pha khac nhau ciia ZnO Khi c^u true wurtzite hi xam

pham, c6 th^ nhan tha'y rang edc peak a dinh ciia viinghoa tri iren giam kh6ng dang k^ v£ 66 cao

1.2 Tinh chat dien cua vat lieu ZnO:

vat lieu ZnO la vat lieu ban din vung cam rpng va th^ng do do chung

la vat lieu c6 nhien kha nang trong umg dung quang hoc va dien hoc Khi nghien curu tinh ch^t dien ciia vat lieu ZnO, nhien nhom nghien cum da nghien cihi sur hinh thanh ban dan loai p khi pha tap va tim cac bien phap de khac phuc sachuyen ttr ban dan loai p sang ban dan loai n

Hinh 1.4 la su phu thupc nhiet dp ciia hang so Hall va nong dp cac phan tiir tai cua ban dan ZnO (theo tinh toan ly thuye't va thuc nghiem) Trong hinh

1.4, b trong khoang nhiet dp 15 K < T < 40 K thi tinh chat van chuyen ciia no

bao gom to hpp cac vung va dp dan qua lai Khi nhiet dp dat 50 K, hdng so Hall dat cue dai 2000 cmVVs sau do giam nhanh khi nhiet dp tdng

Hinh 4: Su phu thupe nhiet dp ciia hang s6 Hall ciia mSu ZnO khoi (hinh tron la di^m

thuc nghiem, dudng liln n^t la du6ng \f thuyét)

Hinh 1.5 la su phu thupc ciia nong dp cac phan tii tai vao 1000/T ciia ban dan ZnO (theo tinh toSn ly thuyét va thuc nghiem) N6ng đ phin tur tii giam tuyén tinh tilr 10'^ (cm ^) xuong lỐ* (cm^) va kha khdrp nhau giOa duilmg tinh toan va duorng thuc nghiem

Hinh 5: Su phu t h u ^ ciia n6iig đ cic phin tur tai v^o lOOO/T ciia bin din ZnO (theo

tinh toan 1^ thuyét va thuc nghiem)

Phin 11: Thuc nghiem

He vat lieu Zn,.,P,0 (x = 0,03; 0,06; 0,09 va 0,12) dupe che tao bang hai phuofng phap: phucfng phap gom va phuong phap hoc bay nhiet trong khi mang N2

D6'i v6i he vat lieu kh6'i, h6n hpp cua bpt ZnO (99 %) va P2O5 (99,9%) dupe can theo ty le hpp phan va dupe nghien Iron theo qui trinh truyen thong Mot phan

nho cua h6n hpp bpt dupe dung di do cac tinh chat nhiet TA, DTG de nghien cihi

qua trinh hinh thanh pha ciia vat lieu, tir do chpn nhiet dp thieu ket thich hop PhSn con lai dupe ep thanh cac mlu hinh h6p bang may ep ihuy luc duoi ap sua't 5

ta'n/cm^ Cac miu sau khi ep dupe sa'y a nhiet dp 80 '*C trong thdi gian 10 gi5 de

iranh bi nut va khi nung Sau do, miu dupe dua vao 16 nung tai cac nhiet dp 750

"C, 900 "C, 1100 "C trong 10 gi6 sau do dupe lam lanh cham den nhiet dp phong

D6i vod he mlu mang, h6n hpp bpt ciia ZnO (99%), P2O5 (99,9%) va 1% khoi lupng cua bpt graphit (Cac bon) dupe can theo ty le hpp phfin, trpn cho deu r6i dupe dat trong thuyen thach anh dua vao phSn giua cua 16 ma tai do nhiet dp,

ap sua't khi N2 va thai gian da dupe dieu khi^n L6 dupe dot tdi 1100 "C giu trong

60 phut Mang tao thanh tren de Si (111) dupe dat trong viing nhiet dp tir 600 den

700 "C Trong suot qua trinh hoc bay nhiet, khi N2 dupe thoi vao d^ lam tranh qua trinh oxy hoa mang

Ca hai loai mlu mang va mSu khoi sau khi dupe tao ra deu dupe nghien cihi cac tinh chat ca'u true va tinh chat dien va quang tren cac thiet bi tai Trung tam khoa hoc Vat lieu thupc khoa Vat ly, tru6ng dai hoc Khoa hoc Tu nhien: pho nhieu

xa tia X ciia cac mSu dupe do tren may do nhieu xa tia X Siemens D5005, anh kinh hi^n vi be mat (SEM) dupe do tren may JEOL-JSM5410LV, ph6 huynh quang cua cac mau dupe do tren may Fluorolog FL3-22 Jobin Yvon Spex USA Phep do hang

so Hall duoc do tren thiet bi do Hall loai 7604

- r i C C Q U O C GIA HA NOI VUNG TAN^ THONG TIN THIJ VIEN

^rl_3o^

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

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

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

Hinh 4: Gian do phan tich TA, DTG ciia mlu Zn,,97P()„30

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

Tempef>i1in"i C' i|i>i4"iai :'\'fii TA i f v a m ^ n t :

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

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

150

Q -ii 100

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 CO bu6c song 390 nm va 509 nm trong viing UV va viing anh sang xanh tuong umg

5 Tai lieu tham khao:

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

nitrogen in ptype 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)

292-294

[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"

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 nano- structure 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

JO! CONG IIOA XA HOI CUV NGIIIA VlIT NAM

TRUONt; HAi il()(^ KHOA IKK 1IJ NIIIKN IhW l;ip - t u 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 22591 SDH 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,

Q U Y E T D I N H 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

AI HOC QUOC GIA HA NOI

ETNAM NATIONAL UNIVERSITY, HANOI

VIETNAM NATIONAL UNIVERSITY, HANOI

JOURNAL OF SCIENCE

MATHEMATICS - PHYSICS

Vol 24, No IS, 2008

CONTENTS

1 Tran Thi Quynh Hoa, Nguyen Ngoc Long, Nguyen Hoang Hai, Stmctural and optical

properties of ZnS nanoparticles synthesized by sonoelectrochemical method 1

2 Pham Van Nho, Duong Dinh Thuan, Effect of htanium doping on characteristics

of nano crystalline In203 films 5

3 Pham Hoang Ngan, Nguyen Quang Tien, Pham Van Nho, Preparation of nitrogen doped

nanocrystalline Ti02 photocatalyst films by using spray pyrolysis 9

4 Nguyen Van Hung, Le Thi Hong Lien, Nguyen Cong Toan, High-order anhamionic

effective potentials and EXAFS cumulants of fee crystals containing doping atom 13

5 Nguyen Thanh Huy, Luu Tuan Tai, Coexistence of ferromagnetism and superconductivity

in the single crystal UCoGe 18

6 Nguyen Mau Chung, The Ha Noi GPHE and B Physics 22

7 Nguyen Mau Chung, Nguyen Anh Due, Nguyen Xuan Giao, Nguyen To Nga, Meson

reconstruction: Preliminary results 27

8 Ngo Thu Huong, Do Thi Kim Anh, Thermoelectric performance of CoSb3 skutterudites

under high pressure 31

9 Ngac An Bang, Phung Thi Thorn, Nguyen Trong Thanh, Surface plasmon resonance of

gold nanoparticles 3 5

10 Le Van Vu, Nguyen Ngoc Long, Chu Dinh Kiem, Sai Cong Doanh,

Cao Thi Nguyet, Pham Thi Hang, Nguyen Duy Thien, Bui Quoc Trung, Synthesis and

optical properties of gold and silver nanoparticles 39

11 Hoang Dinh Trien, Nguyen Quang Bau, Nguyen Thi Thanh Nhan Influence of magnetic

field on the nonlinear absorption coefficient of a strong electromagnetic wave by confined

electrons in quantum wires 47

12 Dinh Due Linh, Phung Quoc Thanh, Bach Thanh Cong, Some physical properties of the

CaossProisMni-^u^Os perovskites prepared by sol-gel technology 51

13 Tran Minh Thi, Pham Van Ben, Nguyen Minh Vuong, Le Thi Thu Huyen,

Microstructure and optical property of polymer-capped ZnS:Cu nanocrystalline thin films 55