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Formation of quasi-one-dimensional carbon chains in cubic nanocrystals by photon-breaking of C–S bonds in polythiophene

Published online by Cambridge University Press:  31 January 2011

Z. M. Ren ,
Y. F. Lu ,
H. W. Choy ,
T. C. Chong ,
S. C. Ng  and
P. Miao
Z. M. Ren
Affiliation:
Laser Microprocessing Laboratory, Data Storage Institute and Department of Electrical Engineering, National University of Singapore, 5 Engineering Drive1, Singapore 117608
Y. F. Lu
Affiliation:
Laser Microprocessing Laboratory, Data Storage Institute and Department of Electrical Engineering, National University of Singapore, 5 Engineering Drive1, Singapore 117608
H. W. Choy
Affiliation:
Laser Microprocessing Laboratory, Data Storage Institute and Department of Electrical Engineering, National University of Singapore, 5 Engineering Drive1, Singapore 117608
T. C. Chong
Affiliation:
Laser Microprocessing Laboratory, Data Storage Institute and Department of Electrical Engineering, National University of Singapore, 5 Engineering Drive1, Singapore 117608
S. C. Ng
Affiliation:
Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
P. Miao
Affiliation:
Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
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Abstract

A solid polythiophene pellet was ablated by a KrF excimer laser beam to deposit thin films on silicon substrates. The laser-ablated plasma was studied by optical emission spectroscopy to identify the photon-breaking of C–S bonds in the ablated heterocycles. Raman and x-ray photoelectron spectroscopy measurements of the deposited thin films also supported the selective photon-induced bond breaking. After eliminating sulfur in the molecular structures, the thin films appeared to be composed of cubic nanocrystals with a uniform size of 240 nm. X-ray diffraction measurement determined the cubic crystal structures with a lattice constant of α =3.38 Å and suggested a quasi-onedimensional carbon chain structure along the body diagonal of the cube.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 10 , October 2001 , pp. 2793 - 2797
Copyright
Copyright © Materials Research Society 2001

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