Assembly and self-organization of silver nanocrystal superlattices: Ordered "soft spheres"

被引:421
作者
Korgel, BA [1 ]
Fullam, S [1 ]
Connolly, S [1 ]
Fitzmaurice, D [1 ]
机构
[1] Natl Univ Ireland Univ Coll Dublin, Dept Chem, Dublin 4, Ireland
关键词
D O I
10.1021/jp981598o
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
Hydrophobic dodecanethiol-capped silver nanocrystals ranging from 50 to 80 Angstrom in diameter were synthesized using arrested growth methods. Size-selective precipitation was employed to isolate nanocrystals homogeneous in size and shape which exhibited close-packed structural order after drying on a carbon or mica substrate. Elemental analysis, H-1 NMR and FTIR spectroscopies were used to characterize the compositional features of the adsorbed thiolate ligands on nanocrystals suspended in solution and condensed in nanocrystal films. Small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) were used to probe the structure of both individual nanocrystals and superlattices, and to estimate the energetic interactions between these sterically stabilized particles. In terms of these measurements, the effects of the capping ligand coverage, particle faceting and shape, and interparticle attractions on superlattice formation are elucidated. In particular, the concept of nanocrystals as "soft spheres" which order with an effective hard sphere diameter is introduced. In addition, the ways in which nanocrystals deviate from such an ideal model an discussed.
引用
收藏
页码:8379 / 8388
页数:10
相关论文
共 60 条
  • [1] STUDIES IN MOLECULAR DYNAMICS .V. HIGH-DENSITY EQUATION OF STATE AND ENTROPY FOR HARD DISKS AND SPHERES
    ALDER, BJ
    HOOVER, WG
    YOUNG, DA
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1968, 49 (08) : 3688 - &
  • [2] PHASE TRANSITION FOR A HARD SPHERE SYSTEM
    ALDER, BJ
    WAINWRIGHT, TE
    [J]. JOURNAL OF CHEMICAL PHYSICS, 1957, 27 (05) : 1208 - 1209
  • [3] Semiconductor clusters, nanocrystals, and quantum dots
    Alivisatos, AP
    [J]. SCIENCE, 1996, 271 (5251) : 933 - 937
  • [4] ''Coulomb staircase'' at room temperature in a self-assembled molecular nanostructure
    Andres, RP
    Bein, T
    Dorogi, M
    Feng, S
    Henderson, JI
    Kubiak, CP
    Mahoney, W
    Osifchin, RG
    Reifenberger, R
    [J]. SCIENCE, 1996, 272 (5266) : 1323 - 1325
  • [5] Self-assembly of a two-dimensional superlattice of molecularly linked metal clusters
    Andres, RP
    Bielefeld, JD
    Henderson, JI
    Janes, DB
    Kolagunta, VR
    Kubiak, CP
    Mahoney, WJ
    Osifchin, RG
    [J]. SCIENCE, 1996, 273 (5282) : 1690 - 1693
  • [6] [Anonymous], 1948, ACTA PHYS AUSTRIACA
  • [7] Self-assembled monolayers on gold nanoparticles
    Badia, A
    Singh, S
    Demers, L
    Cuccia, L
    Brown, GR
    Lennox, RB
    [J]. CHEMISTRY-A EUROPEAN JOURNAL, 1996, 2 (03) : 359 - 363
  • [8] ORDERED AGGREGATES OF ULTRAFINE IRON-OXIDE PARTICLES - SUPER CRYSTALS
    BENTZON, MD
    VANWONTERGHEM, J
    MORUP, S
    THOLEN, A
    KOCH, CJW
    [J]. PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1989, 60 (02): : 169 - 178
  • [9] STRUCTURE AND OPTICAL ABSORPTION OF AGI MICROCRYSTALS
    BERRY, CR
    [J]. PHYSICAL REVIEW, 1967, 161 (03): : 848 - &