Genesis of Pt clusters in reverse micelles investigated by in situ X-ray absorption spectroscopy

被引：47

作者：

Tsai, YW ^{[1
]}

Tseng, YL ^{[1
]}

Sarma, LS ^{[1
]}

Liu, DG ^{[1
]}

Lee, JF ^{[1
]}

Hwang, BJ ^{[1
]}

机构：

[1] Natl Taiwan Univ Sci & Technol, Dept Chem Engn, Taipei 106, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 24期

关键词：

D O I：

10.1021/jp0495592

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：

In situ X-ray absorption spectroscopy (XAS) has been successfully applied to explore the formation mechanism of Pt clusters at the early stages within AOT reverse micelles. Transmission electron microscopy was also utilized to observe the size of the platinum clusters. Upon successive addition of the reducing agent, hydrazine (N2H4) six distinguishable steps were observed for the formation of Pt clusters at the early stage. Both in situ X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) analysis for the Pt L-m-edge confirms the Pt4+ --> Pt2+ --> Pt-0 reduction sequence. A corresponding structural model was proposed for each step so that this work provides a detailed insight into the mechanism of nucleation and growth of platinum clusters.

引用

页码：8148 / 8152

页数：5

共 20 条

[1] Hybridization peaks in Pt-Cl XANES
Ankudinov, AL
Rehr, JJ
Bare, SR
[J]. CHEMICAL PHYSICS LETTERS, 2000, 316 (5-6) : 495 - 500
[2] Effects of the intermicellar exchange rate and cations on the size of silver chloride nanoparticles formed in reverse micelles of AOT
Bagwe, RP
Khilar, KC
[J]. LANGMUIR, 1997, 13 (24) : 6432 - 6438
[3] In situ observation of the potential-dependent chemical state and structure of a Cu monolayer deposited on the surface of carbon-supported platinum clusters
Borthen, P
Hwang, BJ
Strehblow, HH
Kolb, DM
[J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (21): : 5078 - 5083
[4] SOLID-SOLUTION OF CDYZN1-YS NANOSIZE PARTICLES MADE IN REVERSE MICELLES
CIZERON, J
PILENI, MP
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1995, 99 (48) : 17410 - 17416
[5] Cotton F. A., 1988, ADV INORG CHEM, P919
[6] Farges F, 1999, AM MINERAL, V84, P1562
[7] RELATIONSHIP BETWEEN THE AREA OF L2,3 X-RAY ABSORPTION-EDGE RESONANCES AND THE D ORBITAL OCCUPANCY IN COMPOUNDS OF PLATINUM AND IRIDIUM
HORSLEY, JA
[J]. JOURNAL OF CHEMICAL PHYSICS, 1982, 76 (03) : 1451 - 1458
[8] In situ EXAFS investigation of carbon-supported Pt clusters under potential control
Hwang, BJ
Tsai, YW
Lee, JF
Borthen, P
Strehblow, HH
[J]. JOURNAL OF SYNCHROTRON RADIATION, 2001, 8 (02) : 484 - 486
[9] Ordered nanoporous arrays of carbon supporting high dispersions of platinum nanoparticles
Joo, SH
Choi, SJ
Oh, I
Kwak, J
Liu, Z
Terasaki, O
Ryoo, R
[J]. NATURE, 2001, 412 (6843) : 169 - 172
[10] Radiation induced synthesis and characterization of copper nanoparticles
Joshi, SS
Patil, SF
Iyer, V
Mahumuni, S
[J]. NANOSTRUCTURED MATERIALS, 1998, 10 (07): : 1135 - 1144

← 1 2 →