Fine-tuning the shape of gold nanorods

被引:439
作者
Gou, LF [1 ]
Murphy, CJ [1 ]
机构
[1] Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA
关键词
D O I
10.1021/cm050525w
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Gold nanorods prepared by a seed-mediated growth approach use similar to 4-nm gold nanospheres as the seeds and subsequent reduction of metal salt with a weak reducing agent (ascorbic acid) in the presence of a directing surfactant to produce nanorods. If insufficient ascorbic acid is added in the growth step, then metal salt remains. Additional input of ascorbic acid preferentially deposits more metal at the ends of the nanorods, to yield "dogbone"- like structures. Surprisingly, heat treatment of the unpurified gold nanorods (prepared with an insufficient amount of ascorbic acid) yielded fatter gold nanorods; the oxidation product of ascorbic acid appears to act as a reductant at higher temperature. These modified shapes of the gold nanorods directly influence their optical properties.
引用
收藏
页码:3668 / 3672
页数:5
相关论文
共 34 条
  • [11] Wet chemical synthesis of high aspect ratio cylindrical gold nanorods
    Jana, NR
    Gearheart, L
    Murphy, CJ
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (19): : 4065 - 4067
  • [12] Photoinduced conversion of silver nanospheres to nanoprisms
    Jin, RC
    Cao, YW
    Mirkin, CA
    Kelly, KL
    Schatz, GC
    Zheng, JG
    [J]. SCIENCE, 2001, 294 (5548) : 1901 - 1903
  • [13] Photochemical synthesis of gold nanorods
    Kim, F
    Song, JH
    Yang, PD
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (48) : 14316 - 14317
  • [14] Microwave rapid heating for the synthesis of gold nanorods
    Liu, FK
    Chang, YC
    Ko, FH
    Chu, TC
    [J]. MATERIALS LETTERS, 2004, 58 (3-4) : 373 - 377
  • [15] Synthesis and optical characterization of Au/Ag core/shell nanorods
    Liu, MZ
    Guyot-Sionnest, P
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (19) : 5882 - 5888
  • [16] The 'lightning' gold nanorods: fluorescence enhancement of over a million compared to the gold metal
    Mohamed, MB
    Volkov, V
    Link, S
    El-Sayed, MA
    [J]. CHEMICAL PHYSICS LETTERS, 2000, 317 (06) : 517 - 523
  • [17] Thermal reshaping of gold nanorods in micelles
    Mohamed, MB
    Ismail, KZ
    Link, S
    El-Sayed, MA
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (47): : 9370 - 9374
  • [18] Murphy CJ, 2002, ADV MATER, V14, P80, DOI 10.1002/1521-4095(20020104)14:1<80::AID-ADMA80>3.0.CO
  • [19] 2-#
  • [20] Rapid synthesis of gold nanorods by the combination of chemical reduction and photoirradiation processes; morphological changes depending on the growing processes
    Niidome, Y
    Nishioka, K
    Kawasaki, H
    Yamada, S
    [J]. CHEMICAL COMMUNICATIONS, 2003, (18) : 2376 - 2377