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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/6019

Title: Preparation and characterization of carbon/nickel oxide nanocomposite coatings for solar absorber applications
Authors: Roro, KT
Tile, N
Forbes, A
Keywords: Thin films
Sol-gel preparation
Selective surfaces
Nanocomposite materials
Issue Date: Apr-2012
Publisher: Elsevier
Citation: Roro, KT, Tile, N and Forbes, A. 2012. Preparation and characterization of carbon/nickel oxide nanocomposite coatings for solar absorber applications. Applied Surface Science, vol. 258(18), pp 7174-7180
Series/Report no.: Workflow;9189
Abstract: Nanocomposite materials have wide range of applications in solar energy conversion. In this work, C/NiO nanocomposite solar energy absorbing surfaces were prepared using sol-gel synthesis and deposited on aluminium substrates using a spin coater. The coatings were prepared from alcoholic sols based on Ni-acetate using diethalonamine as a chelating agent and polyethylene glycol (PEG) as organic template. Sucrose was used as a carbon source. Sols with different heating temperature and PEG concentrations were fabricated. Thermal analysis on the gel revealed that the xerogels weight loss stabilized at around 430 °C. It was found that the absorption edge shifts to the higher wavelength with an increase in the heating temperature in the temperature range studied, 300-550 °C, due to an increase in carbon content in the material. The main features of Raman spectra obtained from the composite films are the D and G bands, characteristic of graphitic carbon films. The G peak width narrowed while the ratio of the integrated intensities of the D and G peaks, ID/IG, increased with the heating temperature, suggesting a progressive increase of the graphitic domain within the films. The solar absorption property of the films was enhanced with the increase of PEG concentrations in the sols from 0 to 2 g and decreases with further increase of PEG. The best solar absorption, asol, and the surface thermal emittance, etherm, at 100 °C obtained were 85% and 5% for a single layer, respectively, yielding an optical selectivity S = asol/etherm of 17.1
Description: Copyright: 2012 Elsevier. This is an ABSTRACT ONLY.
URI: http://www.sciencedirect.com/science/article/pii/S016943321200671X
ISSN: 0169-4332
Appears in Collections:Sustainable energy futures
General science, engineering & technology

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