The development of organic-inorganic photoactive materials has resulted in significant advancements in heterogeneous visible light photocatalysis. This paper reports the synthesis of visible light-active Ag/TiO2@Pani nanocomposite film via a simple biogenic-chemical route. Electrically conducting Ag/TiO2@Pani nanocomposites were prepared by incorporating Ag/TiO2 in N-methyl-2-pyrrolidone solution of polyaniline (Pani), followed by the preparation of Ag/TiO2@Pani nanocomposite film using solution casting technique. The synthesized Ag/TiO2@Pani nanocomposite was confirmed by UV-visible spectroscopy, photoluminescence spectroscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The Ag/TiO2@Pani nanocomposite film showed superior activity towards the photodegradation of methylene blue under visible light compared to Pani film, even after repeated use. Studies on the thermoelectrical behavior by DC electrical conductivity retention under cyclic aging techniques showed that the Ag/TiO2@Pani nanocomposite film possessed a high combination of electrical conductivity and thermal stability. Because of its better thermoelectric performance and photodegradation properties, such materials might be a suitable advancement in the field of smart materials in near future.

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a b s t r a c tTubular Si-infiltrated SiC f /SiC composites composed of an inner cellular ceramic and an outer dense ceramic matrix composite (CMC) skin were fabricated by the electrophoretic deposition of matrix phases followed by Si-infiltration for solar receiver applications in concentrated solar energy. Using a combined replica method with the 3D printing of polymeric inks, 3 types of the inner cellular ceramics were produced to examine the permeability and heat transfer properties depending on their structure. To form a gastight dense skin layer, SiC fibers were layered on the cylindrical cellular ceramics by filament winding. The resulting preforms were infiltrated by electrophoretic deposition with SiC and carbon black particles and then by molten Si at 1550 1C. The fabrication process, resulting microstructure, and oxidation behavior of the composites at 1400 and 1600 1C in air are explained in Part 1. The thermophysical properties will be explained in Part 2. Overall, this hybrid method is a suitable processing technology for fabricating SiC f /SiC-based solar receivers.

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