A new method is proposed to measure the grain size of gold nanoparticles supported on iron oxide used as catalysts. These particles, particularly active in the oxidative reactions of carbon monoxide and methanol have been characterized by employing a multi-technique approach based on the application of low-frequency Raman (LFR) modes and microscopy techniques. Atomic force microscopy and scanning electron microscopy showed a surface constituted by almost spherical Fe2O3 and Au nanoparticles having a size of 9-17 and 7-30 nm, respectively. LFR was proved to be a very useful technique to selectively probe gold clusters, since no acoustic mode was revealed for Fe2O3 nanoparticles. Furthermore, LFR specifically probed particles around 10 nm in size, which are particularly active in the catalytic process. (C) 2001 Elsevier Science B.V. All rights reserved.
A new method is proposed to measure the grain size of gold nanoparticles supported on iron oxide used as catalysts. These particles, particularly active in the oxidative reactions of carbon monoxide and methanol have been characterized by employing a multi-technique approach based on the application of low-frequency Raman (LFR) modes and microscopy techniques. Atomic force microscopy and scanning electron microscopy showed a surface constituted by almost spherical Fe2O3 and Au nanoparticles having a size of 9-17 and 7-30 nm, respectively. LFR was proved to be a very useful technique to selectively probe gold clusters, since no acoustic mode was revealed for Fe2O3 nanoparticles. Furthermore, LFR specifically probed particles around 10 nm in size, which are particularly active in the catalytic process. (C) 2001 Elsevier Science B.V. All rights reserved.
Low-frequency Raman modes and atomic force microscopy for the size determination of catalytic gold clusters supported on iron oxide
COMPAGNINI, Giuseppe Romano;SCIRE', Salvatore
2001-01-01
Abstract
A new method is proposed to measure the grain size of gold nanoparticles supported on iron oxide used as catalysts. These particles, particularly active in the oxidative reactions of carbon monoxide and methanol have been characterized by employing a multi-technique approach based on the application of low-frequency Raman (LFR) modes and microscopy techniques. Atomic force microscopy and scanning electron microscopy showed a surface constituted by almost spherical Fe2O3 and Au nanoparticles having a size of 9-17 and 7-30 nm, respectively. LFR was proved to be a very useful technique to selectively probe gold clusters, since no acoustic mode was revealed for Fe2O3 nanoparticles. Furthermore, LFR specifically probed particles around 10 nm in size, which are particularly active in the catalytic process. (C) 2001 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
