Anisotropic chemical reactivity of gold spheroids and nanorods

被引：221

作者：

Jana, NR ^{[1
]}

Gearheart, L ^{[1
]}

Obare, SO ^{[1
]}

Murphy, CJ ^{[1
]}

机构：

[1] Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA

来源：

LANGMUIR | 2002年 / 18卷 / 03期

关键词：

D O I：

10.1021/la0114530

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We observed anisotropic chemical reactivity of gold spheroids during cyanide dissolution and reaction with persulfate. Cyanide dissolution of 2-5 aspect ratio spheroids (with 12-30 run short axis) starts at the ends of the long axis and leads to intermediate lower aspect ratio spheroids and spheres. Persulfate converts the spheroids into spheres. In contrast, cyanide dissolution of 18 aspect ratio nanorods (with 16 run short axis) starts simultaneously at many sites and does not change the nanorod length throughout dissolution. Spheroids are thermally less stable than rods and slowly convert to spheres with time, and thus anisotropic chemical reactivity is presumably due to their lower stability.

引用

页码：922 / 927

页数：6

共 25 条

[1] Emission characteristics of VOCs from athletic tracks [J].

Chang, FH ;

Lin, TC ;

Huang, CI ;

Chao, HR ;

Chang, TY ;

Lu, CS .

JOURNAL OF HAZARDOUS MATERIALS, 1999, 70 (1-2) :1-20

[2] Effect of lead nitrate on cyanidation of gold ores: Progress on the study of the mechanisms [J].

Deschenes, G ;

Lastra, R ;

Brown, JR ;

Jin, S ;

May, O ;

Ghali, E .

MINERALS ENGINEERING, 2000, 13 (12) :1263-1279

[3] Electrochemistry of conventional gold cyanidation [J].

Guzman, L ;

Segarra, M ;

Chimenos, JM ;

Cabot, PL ;

Espiell, F .

ELECTROCHIMICA ACTA, 1999, 44 (15) :2625-2632

[4] PHYSICOCHEMICAL PROPERTIES OF SMALL METAL PARTICLES IN SOLUTION - MICROELECTRODE REACTIONS, CHEMISORPTION, COMPOSITE METAL PARTICLES, AND THE ATOM-TO-METAL TRANSITION [J].

HENGLEIN, A .

JOURNAL OF PHYSICAL CHEMISTRY, 1993, 97 (21) :5457-5471

[5] Investigation of cyanide ions adsorbed on platinum and palladium coated silver island films by surface-enhanced Raman spectroscopy [J].

Hesse, E ;

Creighton, JA .

CHEMICAL PHYSICS LETTERS, 1999, 303 (1-2) :101-106

[6]

Jana NR, 2001, ADV MATER, V13, P1389, DOI 10.1002/1521-4095(200109)13:18<1389::AID-ADMA1389>3.0.CO

[7]

2-F

[8] Wet chemical synthesis of high aspect ratio cylindrical gold nanorods [J].

Jana, NR ;

Gearheart, L ;

Murphy, CJ .

JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (19) :4065-4067

[9] The leaching of gold in cyanide solutions in the presence of impurities - II. The effect of silver [J].

Jeffrey, MI ;

Ritchie, IM .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (09) :3272-3276

[10] The leaching and electrochemistry of gold in high purity cyanide solutions [J].

Jeffrey, MI ;

Ritchie, IM .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2001, 148 (04) :D29-D36

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