I prepared thin films of Pani-DBSA/Natural rubber and characterized their surface morphology by Atomic Force Microscopy. The average roughness is around 60 nm
I am not quite sure I understood well your problem but if you are trying to make physical contact between two rough surface yes their respective roughness will influence the global conductvity as the real contact area will depend on the roughness (amplitudes and wavelengths). On the other hand, if you are thinking about the roughness of the substrate and its effect on the conductivity of the depositied film it may depend on the thickness deposited, the homogeneity of the thickness (dependent of the technique used). Valleys might filled up faster thant tips. For both aspects I am sure plenty of litterature is available on the net
specify which property of the thin film you are looking for. It depends...
As you know, the roughness, totally, is an indicating of the level of smoothness of the surface. Higher roughness would cause more light scattering that may lead to higher reflectance or even higher attenuation. Bear in mind, it is a trait of the surface, you don't expect dramatic changes in the structure. Electrical prospective, it can restrict the carrier transport by inducing states on the surface. Depending on the application, the subject would be treatable
Surface roughness can affect, for example, optical properties of a thin film (e.g. reflectivity, scattering). It can also influence tribological behaviour in protective coatings.
Kai Fauth and Madhusmita Sahoo;
Actually I want to investigate the conductivity of the films , what I interested to know is that, is really surface roughness can influence the conductivity of the films? I just try to make some connection between them.
In classical metallic surface science, a rough film is generally indicative of a polycrystalline film. Not sure of your structure, but the electrical conductivity of thin films is strongly correlated to crystal orientation and grain size. If your film has a lot of boundaries filled with non-conductive medium or vacuum, it may give rise to higher roughness and unexpected electrical properties.
There is a glut of literature from the 50s to today on conventional surface and thin film processing for metals, which may begin to direct your search. Perhaps coat with a thin layer of gold and give a look under an electron microscope to learn more about the morphology.
I am not quite sure I understood well your problem but if you are trying to make physical contact between two rough surface yes their respective roughness will influence the global conductvity as the real contact area will depend on the roughness (amplitudes and wavelengths). On the other hand, if you are thinking about the roughness of the substrate and its effect on the conductivity of the depositied film it may depend on the thickness deposited, the homogeneity of the thickness (dependent of the technique used). Valleys might filled up faster thant tips. For both aspects I am sure plenty of litterature is available on the net
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In Impedance spectroscopy, roughness is responsible to produces CPE effect.
CPE in EIS spectroscopy is a constant phase element, an element that can be used in equivalent circuit modelling of the electrochemical cell. It's helpful when fitting the data if 'depressed', i.e. non-ideal semicircles appear in the Nyquist plot.
I don't think the physical significance of these is very well understood, but it's generally thought of as a leaky capacitor, and is typically used to model the double layer capacitance.
Surface roughness can greatly effect both the AC and DC transport properties. As nano-structures are highly dependent on the density of surface states and doping level. Surface roughness can increase absorption effects of different gases , can depict persistent photo-conduction, can tailor electrical transport etc
For the films with different surface roughness will be exist different surface defect states, which considerably affect on their conductivity properties, in particular, the temperature dependence of the conductivity. So, surface roughness may strongly changes the electronic properties of semiconductor thin films.
It influences on efficiency and contact resistance, so that it modifies the performance of optoelectronic devices.
Roughness has an end-to-end influence on surface properties of components and thin films. It has great influence on tribology, corrosion, adhesion, electrical, thermal, etc properties. In fact, if you are researching on this area, I would recommend you do a literature review of the topic and it will be clearer on which direction you are going to take. I am currently writing a book chapter about it and soon it will be published and I will share it with you. However, there is lots of literature about this subject.
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