• PDF / 189,228 Bytes
• 6 Pages / 612 x 792 pts (letter) Page_size
• 80 Downloads / 253 Views

DOWNLOAD

REPORT

---

Jian Yang Structure Research Laboratory and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China

Zheng-Hua Wang Structure Research Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China

Jing-Hui Zeng Structure Research Laboratory and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China

Li Yang Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China

Yi-Tai Qiana) Structure Research Laboratory and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China (Received 6 July 2002; accepted 4 November 2002)

One-dimensional CdS nanocrystallites were used as precursors for preparation of mesoporous CdS nanorods through an ion-exchange process at room temperature. The results from x-ray photoelectron spectroscopy, transmission electron microscopy, energy-dispersive x-ray analysis, and x-ray powder diffraction techniques showed that Ag+ did not affect the electronic structure of CdS or cause the disorder of crystal structure although the product contained a considerable amount of Ag2S. The visible absorption of Ag2S nanoparticles in the mesoporous structure led to the result that the intensities of Raman scattering peaks of the mesoporous nanorods were weaker than those of CdS initial nanorods.

I. INTRODUCTION

The shape control of semiconductor nanomaterials is important in many practical applications.1 Over the past several years, there has been considerable progress in the shape control of nanomaterials.2 On the other hand, the surface modification of nanomaterials has significant influence on their physical or chemical properties. However, the modification of nanomaterials is limited to the adsorption of organic molecules or the deposition of inorganic compounds on the surface.3 To the best of our knowledge, no report exists about how to form mesopores on the surface of one-dimensional chalcogenide nanomaterials. Fabrication of mesoporous materials has been an active and challenging subject in material science because of its potential applications in nanomaterial matrices, a)

e-mail: [email protected]

396

http://journals.cambridge.org

J. Mater. Res., Vol. 18, No. 2, Feb 2003 Downloaded: 14 Mar 2015

electrode materials, solar cells, or catalysts.4 To date, nearly all well-characterized, periodically mesoporous materials have been based on oxides, such as silicate, alumina, titania, zirconia.5 In recent years, mesostructured sulfides have been sought after because of their anticipated electronic and optical properties and their affinity for heavy metals. Stupp’s group successfully developed the method of template synthesis of highly ordered nanoporous composites, which inherited the symmetry and dimensionality from a nonionic amphiphilic mesophase.6 The composites are composed of the self-assembled chalcogen