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Pulsed Laser Deposition and In Situ Scanning Tunneling Microscopy of Pd clusters supported on alumina

Published online by Cambridge University Press:  25 July 2011

C.S. Casari ,
S. Foglio ,
M. Corbetta ,
M. Passoni ,
C.E. Bottani  and
A. Li Bassi
C.S. Casari
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered Materials and Surfaces,Politecnico di Milano, via Ponzio 34/3, I-20133 Milano, Italy Center for Nano Science and Technology of IIT@PoliMI, Via Pascoli 70/3 I-20133 Milano, Italy
S. Foglio
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered Materials and Surfaces,Politecnico di Milano, via Ponzio 34/3, I-20133 Milano, Italy
M. Corbetta
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered Materials and Surfaces,Politecnico di Milano, via Ponzio 34/3, I-20133 Milano, Italy
M. Passoni
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered Materials and Surfaces,Politecnico di Milano, via Ponzio 34/3, I-20133 Milano, Italy
C.E. Bottani
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered Materials and Surfaces,Politecnico di Milano, via Ponzio 34/3, I-20133 Milano, Italy Center for Nano Science and Technology of IIT@PoliMI, Via Pascoli 70/3 I-20133 Milano, Italy
A. Li Bassi
Affiliation:
Dipartimento di Energia and NEMAS – Center for NanoEngineered Materials and Surfaces,Politecnico di Milano, via Ponzio 34/3, I-20133 Milano, Italy Center for Nano Science and Technology of IIT@PoliMI, Via Pascoli 70/3 I-20133 Milano, Italy
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Abstract

With the aim of addressing the material gap issue between model and real systems in heterogeneous catalysis, we exploited Pulsed Laser Deposition (PLD) to produce Pd clusters supported on ultrathin alumina films (Pd/Al2O3/NiAl(001) and Pd/Al2O3-x/HOPG). The structural properties have been investigated by in situ Scanning Tunneling Microscopy (STM) in ultra high vacuum (UHV). At first, Pd clusters were deposited by evaporation and by PLD on Al2O3 surfaces grown by thermal oxidation of NiAl(001). The system shows thermal stability up to 650 K. By PLD we deposited Pd clusters with a good size control obtained by varying the background gas pressure and the target-to-substrate distance. We then realized a

Pd/Al2O3-x/HOPG system where both Pd clusters and the alumina film are produced by PLD showing that, by exploiting the same deposition technique, it is possible to synthesize both a model system addressable by in situ STM and a thick film (∼100 μm) closer to realistic systems.

Keywords

scanning tunneling microscopy (STM)Pdoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1351: Symposium FF – Surfaces and Nanomaterials for Catalysis through In-Situ or Ex-Situ Studies , 2011 , mrss11-1351-ff07-02
Copyright
Copyright © Materials Research Society 2011

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