The dielectric function of silver nanoparticle Langmuir monolayers compressed through the metal insulator transition

被引:63
作者
Henrichs, S
Collier, CP
Saykally, RJ
Shen, YR
Heath, JR
机构
[1] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA
[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 90405 USA
[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 90405 USA
关键词
D O I
10.1021/ja991543f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Algorithms and experimental techniques for extracting the complex dielectric function of thin films (monolayers and bilayers) of quantum dots are developed. The algorithms are based on a combination of the so-called Newton-Raphson method, used in conjunction with a Kramers-Kronig analysis, and are used to analyze normal-incidence reflectance and transmission measurements of organically passivated silver quantum dot Langmuir monolayers. single, unambiguous solutions to the dielectric function were determined for several particle monolayers and at various stages of compression. A transition of the quantum dot superlattice from the insulating to a metallic state was observed. When a monolayer of 6-nm-diameter Ag nanocrystals is compressed to an interparticle separation distance of similar to 8-9 Angstrom, a negative-valued featureless component of the real part of the dielectric function is detected. This indicates the onset of Drude-like behavior that is characteristic of a metallic film. The impact of superlattice disorder on this Drude response is also investigated.
引用
收藏
页码:4077 / 4083
页数:7
相关论文
共 28 条
  • [11] Electronic energy transfer in CdSe quantum dot solids
    Kagan, CR
    Murray, CB
    Nirmal, M
    Bawendi, MG
    [J]. PHYSICAL REVIEW LETTERS, 1996, 76 (09) : 1517 - 1520
  • [12] Individual and collective electronic properties of Ag nanocrystals
    Kim, SH
    Medeiros-Ribeiro, G
    Ohlberg, DAA
    Williams, RS
    Heath, JR
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (47): : 10341 - 10347
  • [13] Assembly and self-organization of silver nanocrystal superlattices: Ordered "soft spheres"
    Korgel, BA
    Fullam, S
    Connolly, S
    Fitzmaurice, D
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (43) : 8379 - 8388
  • [14] CHARGE-QUANTIZATION STUDIES USING A TUNNEL CAPACITOR
    LAMBE, J
    JAKLEVIC, RC
    [J]. PHYSICAL REVIEW LETTERS, 1969, 22 (25) : 1371 - &
  • [15] Reversible metal-insulator transition in ordered metal nanocrystal monolayers observed by impedance spectroscopy
    Markovich, G
    Collier, CP
    Heath, JR
    [J]. PHYSICAL REVIEW LETTERS, 1998, 80 (17) : 3807 - 3810
  • [16] Architectonic quantum dot solids
    Markovich, G
    Collier, CP
    Henrichs, SE
    Remacle, F
    Levine, RD
    Heath, JR
    [J]. ACCOUNTS OF CHEMICAL RESEARCH, 1999, 32 (05) : 415 - 423
  • [17] Rehybridization of electronic structure in compressed two-dimensional quantum dot superlattices
    Medeiros-Ribeiro, G
    Ohlberg, DAA
    Williams, RS
    Heath, JR
    [J]. PHYSICAL REVIEW B, 1999, 59 (03) : 1633 - 1636
  • [18] Mott N F, 1990, METAL INSULATOR TRAN
  • [19] DETERMINATION OF OPTICAL CONSTANTS FROM INTENSITY MEASUREMENTS AT NORMAL INCIDENCE
    NILSSON, PO
    [J]. APPLIED OPTICS, 1968, 7 (03): : 435 - &
  • [20] Electronic response of assemblies of designer atoms: The metal-insulator transition and the role of disorder
    Remacle, F
    Levine, RD
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2000, 122 (17) : 4084 - 4091