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Issue 4, 2012
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Hydroxylated surface of GaAs as a scaffold for a heterogeneous Pd catalyst

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Abstract

A novel use of GaAs, namely, as a scaffold for a heterogeneous palladium catalyst, is proposed. Hydroxy groups on the GaAs surface play important roles. During the adsorption of Pd(OAc)2 on the GaAs surface, the hydroxy groups attract Pd(II) species by anion exchange. A subsequent redox reaction proceeds to generate Pd(0) nanoparticles, which are stabilized on the GaAs surface. This process is confirmed by surface-sensitive measurements: diffuse reflection IR spectroscopy and X-ray photoelectron spectroscopy. Moreover, a more bulk-sensitive measurement, hard X-ray photoemission spectroscopy with synchrotron radiation, also supported our considerations. The amounts of Pd(0) nanoparticles on the surface were evaluated by catalytic activity, yield, and recyclability in the Heck reaction, in addition to the deposit test.

Graphical abstract: Hydroxylated surface of GaAs as a scaffold for a heterogeneous Pd catalyst

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Article information


Submitted
07 Aug 2011
Accepted
10 Nov 2011
First published
07 Dec 2011

Phys. Chem. Chem. Phys., 2012,14, 1424-1430
Article type
Paper

Hydroxylated surface of GaAs as a scaffold for a heterogeneous Pd catalyst

N. Nishiwaki, T. Konishi, S. Hirao, Y. Yamashita, H. Yoshikawa and M. Shimoda, Phys. Chem. Chem. Phys., 2012, 14, 1424
DOI: 10.1039/C1CP22537E

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