Bio-Inspired Mineralization from Aqueous Solutions of Zinc Nitrate Directed by Building Blocks of DNA
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1008-T04-03
Bio-Inspired Mineralization from Aqueous Solutions of Zinc Nitrate Directed by Building Blocks of DNA Micha Jost1, Peter Gerstel1,2, Joachim Bill1,2, and Fritz Aldinger1,2 1 Pulvermetallurgisches Laboratorium, Max-Planck-Institut f¸r Metallforschung, Heisenbergstr. 3, Stuttgart, D-70569, Germany 2 INAM, Universit‰t Stuttgart, Heisenbergstr. 3, Stuttgart, D-70569, Germany
ABSTRACT In this paper, the suitability of DNA- and RNA-bases, nucleosides and nucleotides, and DNA itself as structure-directing agents for the mineralization of ZnO-based materials is discussed. Those bioorganic molecules are able to trigger the morphology of mineralization products ranging from smooth, homogenous thin films to sponge-like, sheet-like and fibrous products. Besides the investigation of morphological features by scanning electron microscopy, the structural characterization of these materials by X-ray diffraction, vibrational spectroscopy, photoluminescence spectroscopy and photoelectron spectroscopy is discussed. INTRODUCTION Zinc oxide and zinc oxide based materials are promising candidates for a number of functional devices, e.g. as UV light emitters or gas sensors [1,2]. For such applications it is of primary importance to control the size, shape, and preferred orientation of ZnO micro- and nanostructures for tailoring the chemical and physical properties. As an alternative and complement to conventional routes for the generation of zinc oxide based materials, chemical bath deposition (CBD), i. e. thermohydrolysis of metal salts, was introduced.[3] However, in the case of zinc oxide the deposition behavior is strongly controlled by the tendency to form elongated micron-sized zincite crystals that make the formation of smooth homogeneous nanostructures difficult. The influence of bioorganic additives on the thermohydrolysis of zinc salts was investigated in our group in detail.[4, 5, 6] These results demonstrate that sugars, amino acids, peptides, and proteins can be used to controll the morphology, exact chemical composition and structure of deposition products obtained from the CBD process. We are currently extending our investigations to the use of DNA-derived additives as structure-directing agents in the thermohydrolysis of zinc salts. To that purpose we investigated the mineralization of ZnO-based products from aqueous solutions of Zn(NO3)2 in the presence of DNA and the building blocks of DNA and RNA namely the corresponding bases, nucleosides and nucleotides (Figure 1). The main goal is to demonstrate that this approach provides a means to design the morphology of ZnO-based materials.
NH2 N
NH2
N
N
N N
N H
adenine base
HO
NH2
NH2 N
N
N
O HO OH
adenosine nucleoside
N N
N HO
O OH
deoxyadenosine deoxynucleoside
N
N O O P O O
N
N O OH
deoxyadenosine monophosphate deoxynucleotide
Figure 1. Structural formulas of DNA building blocks EXPERIMENTAL DETAILS Deposition Experiments. As substrates 1 cm x 1 cm silicon p-type {001} wafers were used. The substrates were cleaned with chloroform, aceto
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