Abstract
Efficient photothermal conversion of solar energy requires spectrally selective surfaces. The purpose of this work is the development of new economically and ecologically benign coating materials by biological means and the evaluation of their optical properties. Our approach to produce wavelength selective composite materials structures relies on the use of metal accumulating microorganisms to produce metallic and metal ion containing nano-particles. Crystalline silver particles with distinct shapes are formed in the periplasmic space of the silver accumulating bacterial strain Pseudomonas stutzeri AG259. A non-metallic carbon host matrix for the silver particles is provided by the organic biomass of the bacteria. The innovation and relevance of our work lies in the biotechnological approach to materials science and in the relatively low investment and operating costs to produce the coating material. Through different heat treatment procedures adjustable optical properties are obtained. Optical spectroscopic measurements were carried out in the UV/VIS/NIR and IR in order to characterise the material. The performance of the material and strategies to optimise the spectral selectivity of the coatings are discussed in terms of effective medium theories.
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