Abstract
Composite transparent electrodes based on carbon nanostructures such as multiwalled carbon nanotubes and graphene platelets were spray coated onto glass substrates and characterized by spectrophotometry and spectroscopic ellipsometry measurements. The dispersion relations of the ellipsometric angle rate, i.e. Ψ and Δ versus wavelength λ were measured in spectral range from 190 to 1700 nm. On the basis of these results, it was possible to estimate the value of the refractive index and extinction coefficient. Effective medium approximation model was chosen to calculate the optical constants of a mixed material. The average surface roughness and the average thickness of spray coated transparent resistive layers were also determined. The materials have a heterogeneous structure as confirmed by scanning electron microscopy and optical measurements (changes of depolarisation). From the Tauc plot it was possible to determine the energy gap. The influence of the coating process and the paint preparation on the optical properties was observed.
Highlights
In recent years several investigations in field of diverse carbon allotropes such as carbon nanotubes and graphene were done
Composite transparent electrodes based on carbon nanostructures such as multiwalled carbon nanotubes and graphene platelets were spray coated onto glass substrates and characterized by spectrophotometry and spectroscopic ellipsometry measurements
scanning electron microscopy (SEM) observations (Fig. 2) showed that the Graphene platelets (GNP) could attract the multiwalled carbon nanotubes (MWCNT) what can be beneficial in term of the homogeneity of the layers the optical properties
Summary
In recent years several investigations in field of diverse carbon allotropes such as carbon nanotubes and graphene were done They are expected to bring new features in a variety of applications thankfully to their extraordinary electrical and mechanical properties [1, 2]. Graphene platelets are used in hybrid materials for example with carbon nanotubes Such systems are described in several applications such as flexible transparent and conductive coatings [21], in supercapacitors [22] and in dye-sensitized solar cells [23]. In our recent paper we described GNP as morphology tailoring additive in carbon nanotube transparent flexible and conductive coatings [24]. In this paper we present optical characterisation of graphene platelet and carbon nanotube hybrid coatings Optical characterization of these materials is very important due to their potential applications in optoelectronics. There is no doubt that the classic transmittance and reflectance measurements should be carried out in parallel
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