金纳米粒子的形貌控制

after 12 h of reaction
after 24–30 h
after 36–42 h
after 48 h of growth
regular arrangement of surfactant bilayers
Room Temperature, High-Yield Synthesis of Multiple Shapes of Gold Nanoparticles in Aqueous Solution
As-synthesized AuNPs TEM
Spherical Au aggregates TEM
Y X Zhang; H C Zeng. Langmuir, 2008, 24 (8), 3740-3746.
Assembly-then-attachment mechanism for total volume reduction
SARA E. SKRABALAK et al. Nano, 2008, 2 (9), 1760-1769
The mechanism for nanocage formation（Ⅰ）
The initial reaction at a high-energy site (surface step, point defect, or hole) The pinhole serves as the anode,and then the site for Ag dissolution

The End
Thanks For Your Attention
TEM images showing cubic to rod-shaped gold particles produced with low AA concentrations in the presence of a small quantity of silver nitrate. [CTAB] was increased from 1.6*10-2 M (A), to 9.5*10-2 M (B,C,D). [Au 3+] decreased from (B) to (C), whereas seed concentration increased from C to D. Scale bar =100 nm.
The mechanism for nanocage formation（Ⅲ）
the galvanic replacement reaction used first to form nanoboxes using the wet etchant Fe(NO3)3 to selectively dissolve Ag
changing the solvent medium in order to control the speed of the evaporation
TEM of two layers of hexagonal (left panel) and ring structure (right panel) of Au nanoparticles
1,9-nonanedithiol
Centrifuging Gold products Ethanol stabilization Teflon-lined stainless steel autoclave
Y X Zhang; H C Zeng. Langmuir, 2008, 24 (8), 3740-3746.
Morphology control of Au Nanoparticles
第 十 成 王 刑 杨 许 薛 景 佳 三 员 立 怀 军 勇 帆 三 祥 组
Importance of Morphology co来自百度文库trol

Unique and tunable optical,electronic,and catalytic properties of Au nanostructures Promising applications in surface-enhanced spectroscopies, chemical or biological sensing, and the fabrication of nanodevices. The properties of Au nanostructures can be tailored by controlling their composition, size, shape, and structure (hollow vs solid).
Biomimetic Synthesis of Gold Nanocrystals Using a Reducing Amphiphile
24 hours
HAuCl4+ Citric Acid based Reactive Surfactant
pH=6.30 to 7.30
Ferdinand Gonzaga, Sherdeep Singh, and Michael A. Brook*. small 2008, 4, No. 9, 1390–1398
Nanorattles(A) and Multiple-Walled Nanoshells(B)
prepared by replacing the Ag nanocubes with other Ag nanostructures Ag deposited on the surface of Au/Ag nanoshells followed by galvanic replacement（A,C） Ag layer deposited on Au/Ag nanoshells followed by galvanic replacement(B,D)
A fancile Polyol Route to Uniform Gold Octahedra Li C. ; Shuford K. L.; Chen M. ; Lee E. J.; Cho S. O. ACS Nano,2008; 2(9); 1760-1769.
The products synthesized in the absence (A,B) and presence (C,D) of surfactant PDDA. Li C. ; Shuford K. L.; Chen M. ; Lee E. J.; Cho S. O. ACS Nano,2008; 2(9); 1760-1769.


Synthesis of Gold Nanocages
A simple means of preparing multimetal hollow structures Like a zinc strip in a solution containing Cu2+ ions Ag nanocubes serve as a template for reaction
TEM images of branched Au nanoparticles, varying in the dimension and number of branches, prepared under various combinations of [seed]/[Au3+] ratio, and the concentrations of CTAB and AA. Tetrapods (A), star-shape (B), larger tetra-pods (C), and multi-pods (D and E).
formation of a physisorbed layer of ionic surfactant (CTAB or SDS) around the capped nanoparticles
TEM of sponge-like structures (left panel) and wires (right panel) of Au nanoparticles
CTAB+ HAuCl4· H2O+NaBH4
Au seed
Tapan K. Sau , Catherine J. Murphy et al. JACS. 2004, 126, 8648-8649
TEM (inset SEM) images of Au nanoparticles synthesized under different conditions. [AA] increases from A to C; and seed concentration increases from C to D. Scale bar ) 100 nm.
SARA E. SKRABALAK et al. Nano, 2008, 2 (9), 1760-1769
Surfactant-Mediated Self-Assembly of Au Nanoparticles
1-dodecanethiol
HAuCl4 + toluene（TOAB） NaBH4 As-AuNPs suspension
Y X Zhang; H C Zeng. Langmuir, 2008, 24 (8), 3740-3746.
A facile Polyol Route to Uniform Gold Octahedra
A facile Polyol Route to Uniform Gold Octahedra Li C. ; Shuford K. L.; Chen M. ; Lee E. J.; Cho S. O. ACS Nano,2008; 2(9); 1760-1769.
S Pyrpassopoulos et al. Nanotechnology 18 (2007):1-4
Conclusion

One method can only synthesis limited Au nanoparticle morphology
Synthesis mechanism in-depth unknown
S Pyrpassopoulos et al. Nanotechnology 18 (2007):1-4
the thermolytic reduction of AuCl3 in oley amine
TEM of 2D hexagonal arrays of Au nanoparticles
S Pyrpassopoulos et al. Nanotechnology 18 (2007):1-4
The mechanism for nanocage formation（Ⅱ）
This difference attributed to poly(PVP) {111} corners poorly passivated Ag dissolution at {111} ,while Au deposition at the {100}
Synthesis and self-organization of Au nanoparticles
Monodisperse (diameter 10 nm) Au nanoparticles
Capped with the alkylamine-TOPO molecules, form two-dimensional superlattices via solvent evaporation The charged particles can assemble in aqueous solution into three-dimensional structures