Effect of Accelerated Thermal Ageing on the Selective Solar Thermal Harvesting Properties of Multiwall Carbon Nanotube/Nickel Oxide Nanocomposite Coatings

Table 1

Tabulation of phonon peak parameters for a typical sample before and after the ageing test.

Peak assignment	Before thermal ageing test				After thermal ageing test
	Area, ∫𝐼(𝜔)𝑑𝜔 (cm^−1)	Centre, 𝜔0 (cm^−1)	Width, Γ (cm^−1)	Intensity, 𝐼 (arb. units)	Area, ∫𝐼(𝜔)𝑑𝜔 (cm^−1)	Centre, 𝜔0 (cm^−1)	Width, Γ (cm^−1)	Intensity, 𝐼 (arb. units)
NiO	18051	524.3	84.2	171.1	61669	502	122.9	400.4
NiO	73115	1121.2	170.6	341.9	47305	1109.8	143.8	262.5
D	3.4 × 10^5	1374.9	182.2	1475.9	2.00 × 10^5	1361.9	143.3	1115.4
G	2.2 × 10^5	1580.8	101.9	1693.4	1.50 × 10^5	1579.6	107	1118.5