Open AccessX‐ray absorption spectroscopic studies on gold nanoparticles in mesoporous and microporous materials
Author(s) -
Akolekar Deepak B.,
Foran Garry,
Bhargava Suresh K.
Publication year - 2004
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049504001694
Subject(s) - microporous material , mesoporous material , colloidal gold , materials science , nanoparticle , absorption (acoustics) , gold alloys , nanotechnology , chemical engineering , chemistry , composite material , organic chemistry , catalysis , alloy , engineering
Au L 3 ‐edge X‐ray absorption spectroscopic measurements were carried out over a series of mesoporous and microporous materials containing gold nanoparticles to investigate the effects of the host matrix and preparation methods on the properties of gold nanoparticles. The materials of structure type MCM‐41, ZSM‐5, SAPO‐18 and LSX with varying framework composition containing low concentrations of gold nanoparticles were prepared and characterized. In these materials the size of the gold nanoparticles varied in the range ∼1 to 4 nm. A series of gold nanoparticles within different mesoporous and microporous materials have been investigated using X‐ray absorption fine structure (XANES, EXAFS) and other techniques. Information such as atomic distances, bonding and neighbouring environment obtained from XAFS measurements was useful in elucidating the nature and structure of gold nanoparticles on these catalytic materials. The influence of the high‐temperature (823, 1113, 1273 K) treatment on gold nanoparticles inside the mesoporous matrix was investigated using the XAFS technique. The XAFS and XANES results confirm various characteristics of gold nanoparticles in these materials suitable for catalysis, fabrication of nanodevices and other applications.