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

[1] BALERNA A, 1986, PHYS REV B, V34, P2293, DOI 10.1103/PhysRevB.34.2293
[2] Structural properties of nanoclusters: Energetic, thermodynamic, and kinetic effects
Baletto, F
Ferrando, R
[J]. REVIEWS OF MODERN PHYSICS, 2005, 77 (01) : 371 - 423
[3] TEMPERATURE AND POLARIZATION DEPENDENCE OF EXTENDED X-RAY ABSORPTION FINE-STRUCTURE SPECTRA
BENI, G
PLATZMAN, PM
[J]. PHYSICAL REVIEW B, 1976, 14 (04): : 1514 - 1518
[4] Melting, premelting, and structural transitions in size-selected aluminum clusters with around 55 atoms
Breaux, GA
Neal, CM
Cao, B
Jarrold, MF
[J]. PHYSICAL REVIEW LETTERS, 2005, 94 (17)
[5] APPLICATION OF THE RATIO METHOD OF EXAFS ANALYSIS TO DISORDERED-SYSTEMS
BUNKER, G
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH, 1983, 207 (03): : 437 - 444
[6] *CHEM RUBB CO, 1967, HDB CHEM PHYS
[7] Permanent magnetism, magnetic anisotropy, and hysteresis of thiol-capped gold nanoparticles -: art. no. 087204
Crespo, P
Litrán, R
Rojas, TC
Multigner, M
de la Fuente, JM
Sánchez-López, JC
García, MA
Hernando, A
Penadés, S
Fernández, A
[J]. PHYSICAL REVIEW LETTERS, 2004, 93 (08) : 087204 - 1
[8] EVIDENCE FOR CRYSTALLINE OVERPRESSURIZED AR CLUSTERS IN AL AND SI
FARACI, G
LAROSA, S
PENNISI, AR
MOBILIO, S
TOURILLON, G
[J]. PHYSICAL REVIEW B, 1991, 43 (12): : 9962 - 9964
[9] THERMAL-EXPANSION AND X-RAY-ABSORPTION FINE-STRUCTURE CUMULANTS
FRENKEL, AI
REHR, JJ
[J]. PHYSICAL REVIEW B, 1993, 48 (01): : 585 - 588
[10] A view from the inside: Complexity in the atomic scale ordering of supported metal nanoparticles
Frenkel, AI
Hills, CW
Nuzzo, RG
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (51) : 12689 - 12703

← 1 2 3 4 5 →