Anomalous vibrational properties induced by surface effects in capped Pt nanoparticles

被引：11

作者：

Giovanetti, Lisandro J.

Ramallo-Lopez, Jose M.

Requejo, Felix G.

Garcia-Gutierrez, Domingo I.

Jose-Yacaman, Miguel

Craievich, Aldo F.

机构：

[1] Natl Univ La Plata, Fac Ciencias Exactas, Dept Fis, RA-1900 La Plata, Argentina

[2] Consejo Nacl Invest Cient & Tecn, IFLP INIFTA, RA-1900 La Plata, Argentina

[3] Univ Texas, Dept Chem Engn, Austin, TX 78712 USA

[4] Univ Texas, Texas Mat Inst, Austin, TX 78712 USA

[5] Univ Sao Paulo, Inst Phys, BR-05508900 Sao Paulo, SP, Brazil

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 21期

关键词：

D O I：

10.1021/jp068419k

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：

The Debye temperature of Pt nanoparticles (NP) capped in PVP-K30 with an average diameter of 3 nm was determined from extended X-ray absorption fine structure measurements between 20 and 373 K. The size distribution of the NP was determined by high-resolution transmission electron microscopy, high-angle annular dark field, and small-angle X-ray scattering. We have experimentally established that the Debye temperature of truncated cuboctahedron, capped Pt NP is 70 K higher than that of bulk Pt metal. The rather high value of the Debye temperature of nanosized-capped Pt crystals is related to surface Pt-Pt contraction effects in conjunction with capping interactions. This finding evidences that the vibrational behavior of nanostructure materials differs markedly from that of materials in bulk form.

引用

页码：7599 / 7604

页数：6

共 45 条

[11] Temperature effect on the synthesis of Au-Pt bimetallic nanoparticles
Garcia-Gutierrez, DI
Gutierrez-Wing, CE
Giovanetti, L
Ramallo-López, JM
Requejo, FG
Jose-Yacaman, M
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (09) : 3813 - 3821
[12] Guinier G Fournet A., 1955, SMALL ANGLE SCATTERI
[13] Divide and protect:: Capping gold nanoclusters with molecular gold-thiolate rings
Hakkinen, H
Walter, M
Grönbeck, H
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (20) : 9927 - 9931
[14] Unusual non-bulk properties in nanoscale materials:: Thermal metal-metal bond contraction of γ-alumina-supported Pt catalysts
Kang, Joo H.
Menard, Laurent D.
Nuzzo, Ralph G.
Frenkel, Anatoly I.
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (37) : 12068 - 12069
[15] The small-angle X-ray scattering beamline of the Brazilian Synchrotron Light Laboratory
Kellermann, G
Vicentin, F
Tamura, E
Rocha, M
Tolentino, H
Barbosa, A
Craievich, A
Torriani, I
[J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 1997, 30 (02) : 880 - 883
[16] Structure and melting of Bi nanocrystals embedded in a B2O3-Na2O glass -: art. no. 134204
Kellermann, G
Craievich, AF
[J]. PHYSICAL REVIEW B, 2002, 65 (13) : 1 - 6
[17] XAFS spectroscopy; fundamental principles and data analysis
Koningsberger, DC
Mojet, BL
van Dorssen, GE
Ramaker, DE
[J]. TOPICS IN CATALYSIS, 2000, 10 (3-4) : 143 - 155
[18] KOOPS GEJ, 1994, PHYS REV B, V70, P5410
[19] TEMPERATURE-DEPENDENCE OF EXAFS SPECTRA OF SUPPORTED SMALL METAL PARTICLES
KURODA, H
YOKOYAMA, T
ASAKURA, K
IWASAWA, Y
[J]. FARADAY DISCUSSIONS, 1991, 92 : 189 - 198
[20] The role of twinning in shape evolution of anisotropic noble metal nanostructures
Luis Elechiguerra, Jose
Reyes-Gasga, Jose
Jose Yacaman, Miguel
[J]. JOURNAL OF MATERIALS CHEMISTRY, 2006, 16 (40) : 3906 - 3919

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