Morphology Control of ZnO Nanomaterials using Double Hydrophilic Block Copolymers
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0901-Rb15-05.1
Morphology Control of ZnO Nanomaterials using Double Hydrophilic Block Copolymers
A.Mezy1, C.Gérardin2, D.Tichit2, S.Suwanboon1, D.Ravot1, J-C.Tedenac1, T.Bretagnon3, P.Lefèbvre3. 1 Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique UMR 5618 ENSCM 8 rue de l’école Normale 34095 Montpellier cedex 5 FRANCE. 2
Laboratoire de Physicochimie de la Matière Condensée UMR 5617 Université Montpellier2, Place Eugène Bataillon 34095 Montpellier cedex 5 FRANCE.
3
Groupe d’Etude des Semi-conducteurs UMR 5650 Université Montpellier 2, Place Eugène Bataillon 34095 Montpellier cedex 5 FRANCE.
ABSTRACT Highly crystalline zinc oxide (ZnO) nanomaterials are synthesized using a seeded growth solgel method. In order to control the morphology and the organization of the ZnO nanomaterials, a double hydrophilic block copolymer has been introduced during the seeded growth synthesis: the Polyacrylic acid-Polyacrylamide (PAA-PAM). Depending on the amount of PAA-PAM copolymers, different morphologies were obtained, such as ZnO nanostructured spheres or flat hexagonal crystals. Thus, systematic studies have been done to investigate the influence of the copolymer addition on ZnO nanomaterial morphologies and explain the mechanisms of the morphological modifications. Keywords: ZnO nanoparticles; dip-coating; sol gel; semiconductor; nanostructuration; polymers
1. INTRODUCTION Zinc Oxide is a II-VI semiconductor with an hexagonal wurtzite crystal structure, which presents a direct wide band-gap of 3.37 eV [1] at room temperature and a large exciton binding energy of 60 meV [2]. ZnO exhibits a large variety of nanoscale behaviours among all materials, both in terms of structural and physical properties. Much attention has been paid to nanostructured ZnO materials, due to their potential use for electronic, photonic, catalytic, and sensor applications [3,4,5]. Among low dimensionality (1D) semiconductors, ZnO nanorods are of special interest for their applications as high efficiency short wavelength optoelectronic nanodevices because of their large excitonic binding energy and high mechanical and thermal stabilities. Due to their physical and chemical properties, ZnO nanorods have a great commercial interest. Many methods have been employed for the growth of ZnO nanomaterials, such as rf magnetron sputtering [6], chemical vapor deposition [7], spray pyrolysis [8], thermal evaporation [9] etc. However, low cost and simplicity of the synthesis processes are required for commercial development. The wet chemical synthesis route seems to meet these requirements, enabling the preparation of high crystalline quality and proper growth orientation of ZnO nanorods. The synthesis route used in this study declines into two steps. The first one is the synthesis of supported ZnO nanoparticles that will be used as seeds for the subsequent growth of ZnO
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nanorods in a second step. One of the objectives is to grow well dispersed and individual crystals from the supported seeds. For that, a hydrophilic polyacryl
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