Optical study of the ultrasonic formation process of noble metal nanoparticles dispersed inside the pores of monolithic mesoporous silica

被引：8

作者：

Fu, GH ^{[1
]}

Cai, WP ^{[1
]}

Kan, CX ^{[1
]}

Li, CC ^{[1
]}

Fang, Q ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Solid State Phys, Hefei 230031, Peoples R China

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2003年 / 36卷 / 12期

关键词：

SILVER NANOMETER PARTICLES; GOLD NANOPARTICLES; ABSORPTION; IRRADIATION;

D O I：

10.1088/0022-3727/36/12/305

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Gold nanoparticles dispersed inside the pores of monolithic mesoporous silica were prepared by soaking the silica in a gold (111) ion solution and subsequent ultrasound irradiation. The formation process of gold nanoparticles in the pores of mesoporous silica was investigated based on optical measurements of wrapped and naked soaked silica after ultrasonic irradiation, and the reduction rate effect in solution and pre-soaking effect. It has been shown that acoustic cavitation cannot occur in nano-sized pores. The gold nanoparticles in silica are not formed in situ within the pores but produced mainly by diffusion of the gold clusters formed in the solution during irradiation into the pores. The radicals formed in solution are exhausted before entering the pores of silica. There exists a critical reduction rate in solution, at which the yield of gold nanoparticles in silica reaches a maximum, and above which there is a decrease in the yield. This is attributed to too quick a growth or aggregation of gold clusters formed in solution before diffusion into the pores of silica.

引用

页码：1382 / 1387

页数：6

共 27 条

[1] Reversible transition between transparency and opacity for the porous silica host dispersed with silver nanometer particles within its pores [J].

Cai, WP ;

Tan, M ;

Wang, GZ ;

Zhang, LD .

APPLIED PHYSICS LETTERS, 1996, 69 (20) :2980-2982

[2] Semiconducting optical properties of silver/silica mesoporous composite [J].

Cai, WP ;

Zhang, Y ;

Jia, JH ;

Zhang, LD .

APPLIED PHYSICS LETTERS, 1998, 73 (19) :2709-2711

[3]

Cai WP, 1997, J PHYS-CONDENS MAT, V9, P7257, DOI 10.1088/0953-8984/9/34/015

[4] Ambience-induced alternating change of optical absorption for the porous silica host Loaded with silver nanometer particles [J].

Cai, WP ;

Zhang, LD .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 1998, 66 (04) :419-422

[5] Annealing of mesoporous silica loaded with silver nanoparticles within its pores from isothermal sorption [J].

Cai, WP ;

Zhang, LD ;

Zhong, HC ;

He, GL .

JOURNAL OF MATERIALS RESEARCH, 1998, 13 (10) :2888-2895

[6] Structural change of mesoporous silica with sonochemically prepared gold nanoparticles in its pores [J].

Chen, W ;

Cai, WP ;

Chen, ZX ;

Zhang, LD .

ULTRASONICS SONOCHEMISTRY, 2001, 8 (04) :335-339

[7] A sonochemical approach to the confined synthesis of palladium nanoparticles in mesoporous silica [J].

Chen, W ;

Cai, WP ;

Lei, Y ;

Zhang, LD .

MATERIALS LETTERS, 2001, 50 (2-3) :53-56

[8] Effects of interface interaction on the Mie resonance absorption of gold nanoparticles dispersed within pores of mesoporous silica [J].

Chen, W ;

Cai, WP ;

Wang, GZ ;

Zhang, L .

APPLIED SURFACE SCIENCE, 2001, 174 (01) :51-54

[9] Sonochemical processes and formation of gold nanoparticles within pores of mesoporous silica [J].

Chen, W ;

Cai, WP ;

Zhang, L ;

Wang, GZ ;

Zhang, LD .

JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2001, 238 (02) :291-295

[10] Synthesis of gold nanoparticles dispersed within pores of mesoporous silica induced by ultrasonic irradiation and its characterization [J].

Chen, W ;

Cai, WP ;

Liang, CH ;

Zhang, LD .

MATERIALS RESEARCH BULLETIN, 2001, 36 (1-2) :335-342

← 1 2 3 →